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September Weather in Santo Tomás Colombia

Daily high temperatures are around 91°F, rarely falling below 86°F or exceeding 95°F.

Daily low temperatures are around 77°F, rarely falling below 74°F or exceeding 80°F.

For reference, on April 7, the hottest day of the year, temperatures in Santo Tomás typically range from 78°F to 92°F, while on January 17, the coldest day of the year, they range from 76°F to 90°F.

Average High and Low Temperature in September in Santo Tomás

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in September in Santo Tomás

Average Hourly Temperature in September in Santo TomásSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAugOctwarmwarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Klang, Malaysia (11,461 miles away) and Situbondo, Indonesia (11,816 miles) are the far-away foreign places with temperatures most similar to Santo Tomás (view comparison).

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The month of September in Santo Tomás experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 95% throughout the month. The highest chance of overcast or mostly cloudy conditions is 96% on September 28.

The clearest day of the month is September 4, with clear, mostly clear, or partly cloudy conditions 6% of the time.

For reference, on September 23, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 96%, while on January 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 51%.

Cloud Cover Categories in September in Santo Tomás

Cloud Cover Categories in September in Santo TomásSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctJan 1351%Jan 1351%Sep 16%Sep 16%Sep 305%Sep 305%Sep 115%Sep 115%Sep 215%Sep 215%mostly cloudyovercastpartly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Santo Tomás, the chance of a wet day over the course of September is increasing, starting the month at 36% and ending it at 41%.

For reference, the year's highest daily chance of a wet day is 46% on October 18, and its lowest chance is 1% on March 1.

Probability of Precipitation in September in Santo Tomás

Probability of Precipitation in September in Santo TomásSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%50%50%AugOctSep 136%Sep 136%Sep 3041%Sep 3041%Sep 1136%Sep 1136%Sep 2138%Sep 2138%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during September in Santo Tomás is rapidly increasing, starting the month at 2.9 inches, when it rarely exceeds 5.5 inches or falls below 0.7 inches, and ending the month at 3.9 inches, when it rarely exceeds 6.8 inches or falls below 1.3 inches.

Average Monthly Rainfall in September in Santo Tomás

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of September in Santo Tomás, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 17 minutes, implying an average daily decrease of 35 seconds, and weekly decrease of 4 minutes, 6 seconds.

The shortest day of the month is September 30, with 12 hours, 2 minutes of daylight and the longest day is September 1, with 12 hours, 19 minutes of daylight.

Hours of Daylight and Twilight in September in Santo Tomás

Hours of Daylight and Twilight in September in Santo TomásSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 7 minSep 2212 hr, 7 minnightnightdaydaySep 112 hr, 19 minSep 112 hr, 19 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The latest sunrise of the month in Santo Tomás is 5:49 AM on September 1 and the earliest sunrise is 1 minute, 31 seconds earlier at 5:47 AM on September 30.

The latest sunset is 6:08 PM on September 1 and the earliest sunset is 19 minutes earlier at 5:49 PM on September 30.

Daylight saving time is not observed in Santo Tomás during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:38 AM and sets 12 hours, 45 minutes later, at 6:23 PM, while on December 21, the shortest day of the year, it rises at 6:12 AM and sets 11 hours, 30 minutes later, at 5:42 PM.

Sunrise & Sunset with Twilight in September in Santo Tomás

Sunrise & Sunset with Twilight in September in Santo TomásSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMAugOct5:47 AM5:47 AMSep 305:49 PMSep 305:49 PM5:49 AM5:49 AMSep 16:08 PMSep 16:08 PM5:48 AM5:48 AMSep 116:01 PMSep 116:01 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of September. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in September in Santo Tomás

Solar Elevation and Azimuth in September in Santo TomásSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAugOct001010202020303040405050506060707080800001010202030303040405050606060707080
northeastsouthwest
Solar elevation and azimuth over the course of September 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for September 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in September in Santo Tomás

Moon Rise, Set & Phases in September in Santo TomásSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 46:14 AMAug 46:14 AMAug 191:26 PMAug 191:26 PMSep 28:56 PMSep 28:56 PMSep 179:35 PMSep 179:35 PMOct 21:50 PMOct 21:50 PMOct 176:27 AMOct 176:27 AM5:52 AM5:52 AM6:48 PM6:48 PM6:29 PM6:29 PM6:35 AM6:35 AM5:26 AM5:26 AM6:04 PM6:04 PM5:49 PM5:49 PM6:12 AM6:12 AM5:36 AM5:36 AM5:49 PM5:49 PM5:08 PM5:08 PM5:48 AM5:48 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Sep 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
2%4:38 AMENE5:27 PMWNW-11:04 AMN249,131 mi
2
0%5:26 AMENE6:04 PMW-11:46 AMN250,537 mi
3
0%6:11 AME6:40 PMW-12:26 PMS251,583 mi
4
3%6:54 AME7:14 PMW-1:05 PMS252,225 mi
5
6%7:38 AME7:48 PMW-1:43 PMS252,400 mi
6
12%8:21 AME8:24 PMWSW-2:22 PMS252,034 mi
7
19%9:07 AMESE9:02 PMWSW-3:04 PMS251,051 mi
8
27%9:54 AMESE9:43 PMWSW-3:48 PMS249,396 mi
9
37%10:45 AMESE10:28 PMWSW-4:36 PMS247,044 mi
10
47%11:39 AMESE11:19 PMWSW-5:28 PMS244,028 mi
11
50%12:35 PMESE--6:25 PMS240,451 mi
12
68%-12:14 AMWSW1:33 PMESE7:23 PMS236,500 mi
13
78%-1:14 AMWSW2:29 PMESE8:23 PMS232,450 mi
14
87%-2:15 AMWSW3:24 PMESE9:21 PMS228,640 mi
15
94%-3:16 AMWSW4:15 PMESE10:16 PMS225,435 mi
16
99%-4:16 AMWSW5:03 PMESE11:09 PMS223,167 mi
17
100%-5:14 AMW5:49 PME--
18
100%-6:12 AMW6:35 PME12:00 AMS222,082 mi
19
98%-7:10 AMW7:21 PME12:51 AMS222,290 mi
20
93%-8:08 AMWNW8:09 PMENE1:43 AMN223,743 mi
21
85%-9:09 AMWNW9:01 PMENE2:37 AMN226,250 mi
22
76%-10:10 AMWNW9:56 PMENE3:34 AMN229,516 mi
23
65%-11:12 AMWNW10:53 PMENE4:33 AMN233,204 mi
24
50%-12:12 PMWNW11:52 PMENE5:33 AMN236,984 mi
25
43%-1:08 PMWNW-6:31 AMN240,585 mi
26
32%12:49 AMENE2:00 PMWNW-7:26 AMN243,813 mi
27
23%1:44 AMENE2:46 PMWNW-8:16 AMN246,555 mi
28
15%2:35 AMENE3:27 PMWNW-9:03 AMN248,765 mi
29
9%3:23 AMENE4:05 PMWNW-9:46 AMN250,445 mi
30
4%4:09 AME4:41 PMW-10:26 AMS251,621 mi

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Santo Tomás is essentially constant during September, remaining around 100% throughout.

For reference, on April 10, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 31, the least muggy day of the year, there are muggy conditions 100% of the time.

Humidity Comfort Levels in September in Santo Tomás

Humidity Comfort Levels in September in Santo TomásSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOctSep 16100%Sep 16100%Sep 1100%Sep 1100%Sep 30100%Sep 30100%miserablemiserableoppressiveoppressive
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Santo Tomás is essentially constant during September, remaining within 0.2 miles per hour of 4.9 miles per hour throughout.

For reference, on February 26, the windiest day of the year, the daily average wind speed is 10.1 miles per hour, while on October 3, the calmest day of the year, the daily average wind speed is 4.6 miles per hour.

Average Wind Speed in September in Santo Tomás

Average Wind Speed in September in Santo TomásSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mphAugOctSep 15.1 mphSep 15.1 mphSep 304.6 mphSep 304.6 mphSep 114.9 mphSep 114.9 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Santo Tomás throughout September is predominantly from the north, with a peak proportion of 58% on September 8.

Wind Direction in September in Santo Tomás

Wind Direction in September in Santo TomásSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOcteastnorthwestsouth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Santo Tomás is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Santo Tomás is essentially constant during September, remaining around 84°F throughout.

The highest average surface water temperature during September is 84°F on September 28.

Average Water Temperature in September in Santo Tomás

Average Water Temperature in September in Santo TomásSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303081.0°F81.0°F81.5°F81.5°F82.0°F82.0°F82.5°F82.5°F83.0°F83.0°F83.5°F83.5°F84.0°F84.0°F84.5°F84.5°F85.0°F85.0°F85.5°F85.5°F86.0°F86.0°FAugOctSep 2884°FSep 2884°FSep 184°FSep 184°FSep 1184°FSep 1184°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in Santo Tomás are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in September in Santo Tomás

Time Spent in Various Temperature Bands and the Growing Season in September in Santo TomásSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOct100%Sep 16100%Sep 16warmhotcomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Santo Tomás are very rapidly increasing during September, increasing by 914°F, from 7,740°F to 8,654°F, over the course of the month.

Growing Degree Days in September in Santo Tomás

Growing Degree Days in September in Santo TomásSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930307,600°F7,600°F7,800°F7,800°F8,000°F8,000°F8,200°F8,200°F8,400°F8,400°F8,600°F8,600°F8,800°F8,800°FAugOctSep 17,740°FSep 17,740°FSep 308,654°FSep 308,654°FSep 118,057°FSep 118,057°FSep 218,374°FSep 218,374°F
The average growing degree days accumulated over the course of September, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Santo Tomás is essentially constant during September, remaining within 0.2 kWh of 3.5 kWh throughout.

Average Daily Incident Shortwave Solar Energy in September in Santo Tomás

Average Daily Incident Shortwave Solar Energy in September in Santo TomásSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300.0 kWh0.0 kWh0.5 kWh0.5 kWh1.0 kWh1.0 kWh1.5 kWh1.5 kWh2.0 kWh2.0 kWh2.5 kWh2.5 kWh3.0 kWh3.0 kWh3.5 kWh3.5 kWh4.0 kWh4.0 kWh4.5 kWh4.5 kWh5.0 kWh5.0 kWh5.5 kWh5.5 kWh6.0 kWh6.0 kWhAugOctSep 13.7 kWhSep 13.7 kWhSep 303.3 kWhSep 303.3 kWhSep 113.5 kWhSep 113.5 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Santo Tomás are 10.758 deg latitude, -74.755 deg longitude, and 33 ft elevation.

The topography within 2 miles of Santo Tomás contains only modest variations in elevation, with a maximum elevation change of 118 feet and an average elevation above sea level of 31 feet. Within 10 miles also contains only modest variations in elevation (486 feet). Within 50 miles contains only modest variations in elevation (6,115 feet).

The area within 2 miles of Santo Tomás is covered by grassland (43%), water (28%), and trees (18%), within 10 miles by grassland (51%) and trees (20%), and within 50 miles by water (44%) and grassland (23%).

This report illustrates the typical weather in Santo Tomás, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Santo Tomás.

For each station, the records are corrected for the elevation difference between that station and Santo Tomás according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Santo Tomás is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Santo Tomás and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Santo Tomás and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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