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September Weather in Valença do Piauí Brazil

Daily high temperatures are around 99°F, rarely falling below 96°F or exceeding 103°F.

Daily low temperatures increase by 2°F, from 73°F to 75°F, rarely falling below 69°F or exceeding 78°F.

For reference, on October 2, the hottest day of the year, temperatures in Valença do Piauí typically range from 75°F to 100°F, while on July 24, the coldest day of the year, they range from 70°F to 95°F.

Average High and Low Temperature in September in Valença do Piauí

Average High and Low Temperature in September in Valença do PiauíSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303065°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°F100°F100°F105°F105°FAugOctSep 198°FSep 198°F73°F73°FSep 30100°FSep 30100°F75°F75°FSep 1199°FSep 1199°F74°F74°FSep 21100°FSep 21100°F74°F74°F
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 Valença do Piauí

Average Hourly Temperature in September in Valença do PiauíSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOctcomfortablewarmwarmhothotsweltering
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.

Valle San Francisco, Nicaragua (3,330 miles away) is the far-away foreign place with temperatures most similar to Valença do Piauí (view comparison).

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The month of September in Valença do Piauí experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 38% to 49%.

The clearest day of the month is September 2, with clear, mostly clear, or partly cloudy conditions 62% of the time.

For reference, on March 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 80%, while on July 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%.

Cloud Cover Categories in September in Valença do Piauí

Cloud Cover Categories in September in Valença do PiauíSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctSep 162%Sep 162%Sep 3051%Sep 3051%Sep 1159%Sep 1159%Sep 2156%Sep 2156%clearmostly clearpartly cloudymostly cloudyovercast
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 Valença do Piauí, the chance of a wet day over the course of September is increasing, starting the month at 1% and ending it at 5%.

For reference, the year's highest daily chance of a wet day is 61% on March 16, and its lowest chance is 0% on August 14.

Probability of Precipitation in September in Valença do Piauí

Probability of Precipitation in September in Valença do PiauíSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%1%1%2%2%3%3%4%4%5%5%6%6%7%7%8%8%9%9%10%10%11%11%AugOctSep 11%Sep 11%Sep 305%Sep 305%Sep 112%Sep 112%Sep 213%Sep 213%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 Valença do Piauí is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.8 inches or falling below -0.0 inches.

Average Monthly Rainfall in September in Valença do Piauí

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 Valença do Piauí, the length of the day is essentially constant. The shortest day of the month is September 1, with 11 hours, 59 minutes of daylight and the longest day is September 30, with 12 hours, 9 minutes of daylight.

Hours of Daylight and Twilight in September in Valença do Piauí

Hours of Daylight and Twilight in September in Valença do PiauíSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 6 minSep 2212 hr, 6 mindaydaydaydaynightSep 111 hr, 59 minSep 111 hr, 59 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 Valença do Piauí is 5:47 AM on September 1 and the earliest sunrise is 15 minutes earlier at 5:32 AM on September 30.

The latest sunset is 5:46 PM on September 1 and the earliest sunset is 5 minutes earlier at 5:41 PM on September 30.

Daylight saving time is not observed in Valença do Piauí during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:30 AM and sets 12 hours, 30 minutes later, at 6:00 PM, while on June 20, the shortest day of the year, it rises at 5:56 AM and sets 11 hours, 45 minutes later, at 5:41 PM.

Sunrise & Sunset with Twilight in September in Valença do Piauí

Sunrise & Sunset with Twilight in September in Valença do PiauíSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PMAugOct5:32 AM5:32 AMSep 305:41 PMSep 305:41 PM5:47 AM5:47 AMSep 15:46 PMSep 15:46 PM5:42 AM5:42 AMSep 115:44 PMSep 115:44 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 Valença do Piauí

Solar Elevation and Azimuth in September in Valença do PiauíSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 Valença do Piauí

Moon Rise, Set & Phases in September in Valença do PiauíSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 48:14 AMAug 48:14 AMAug 193:26 PMAug 193:26 PMSep 210:56 PMSep 210:56 PMSep 1711:35 PMSep 1711:35 PMOct 23:50 PMOct 23:50 PMOct 178:27 AMOct 178:27 AM6:04 AM6:04 AM6:07 PM6:07 PM5:53 PM5:53 PM6:32 AM6:32 AM5:26 AM5:26 AM5:36 PM5:36 PM5:27 PM5:27 PM5:56 AM5:56 AM5:18 AM5:18 AM5:40 PM5:40 PM4:59 PM4:59 PM5:18 AM5:18 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%4:45 AMENE4:51 PMWNW-10:49 AMN248,986 mi
2
0%5:26 AMENE5:36 PMW-11:32 AMN250,423 mi
3
0%6:04 AME6:18 PMW-12:12 PMN251,504 mi
4
2%6:41 AME7:00 PMW-12:50 PMN252,185 mi
5
6%7:17 AME7:41 PMW-1:29 PMN252,406 mi
6
12%7:54 AME8:24 PMWSW-2:08 PMS252,091 mi
7
18%8:32 AMESE9:08 PMWSW-2:49 PMS251,168 mi
8
27%9:12 AMESE9:55 PMWSW-3:32 PMS249,575 mi
9
36%9:57 AMESE10:46 PMWSW-4:20 PMS247,287 mi
10
46%10:45 AMESE11:40 PMWSW-5:12 PMS244,329 mi
11
50%11:39 AMESE--6:07 PMS240,797 mi
12
67%-12:36 AMWSW12:36 PMESE7:06 PMS236,872 mi
13
77%-1:34 AMWSW1:36 PMESE8:05 PMS232,819 mi
14
86%-2:31 AMWSW2:36 PMESE9:03 PMS228,972 mi
15
94%-3:26 AMWSW3:35 PMESE9:58 PMS225,696 mi
16
98%-4:18 AMWSW4:32 PMESE10:51 PMS223,330 mi
17
100%-5:07 AMW5:27 PME11:42 PMN222,129 mi
18
100%-5:56 AMW6:22 PME--
19
98%-6:44 AMW7:18 PME12:33 AMN222,216 mi
20
94%-7:33 AMWNW8:15 PMENE1:25 AMN223,560 mi
21
86%-8:25 AMWNW9:14 PMENE2:19 AMN225,981 mi
22
77%-9:19 AMWNW10:14 PMENE3:16 AMN229,192 mi
23
66%-10:17 AMWNW11:15 PMENE4:15 AMN232,856 mi
24
50%-11:15 AMWNW-5:15 AMN236,641 mi
25
44%12:14 AMENE12:13 PMWNW-6:14 AMN240,268 mi
26
33%1:09 AMENE1:09 PMWNW-7:09 AMN243,537 mi
27
24%1:59 AMENE2:01 PMWNW-8:01 AMN246,327 mi
28
16%2:45 AMENE2:49 PMWNW-8:48 AMN248,586 mi
29
9%3:26 AMENE3:34 PMWNW-9:31 AMN250,314 mi
30
4%4:05 AME4:17 PMW-10:11 AMN251,534 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 Valença do Piauí is increasing during September, rising from 9% to 16% over the course of the month.

For reference, on March 27, the muggiest day of the year, there are muggy conditions 98% of the time, while on August 25, the least muggy day of the year, there are muggy conditions 9% of the time.

Humidity Comfort Levels in September in Valença do Piauí

Humidity Comfort Levels in September in Valença do PiauíSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOctSep 19%Sep 19%Sep 3016%Sep 3016%Sep 1110%Sep 1110%Sep 2112%Sep 2112%muggymuggyhumidhumidcomfortablecomfortabledrydryoppressiveoppressive
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 Valença do Piauí is gradually decreasing during September, decreasing from 11.1 miles per hour to 10.2 miles per hour over the course of the month.

For reference, on August 9, the windiest day of the year, the daily average wind speed is 11.3 miles per hour, while on March 31, the calmest day of the year, the daily average wind speed is 5.7 miles per hour.

Average Wind Speed in September in Valença do Piauí

Average Wind Speed in September in Valença do PiauíSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphAugOctSep 111.1 mphSep 111.1 mphSep 3010.2 mphSep 3010.2 mphSep 1610.7 mphSep 1610.7 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 Valença do Piauí throughout September is predominantly from the east, with a peak proportion of 84% on September 19.

Wind Direction in September in Valença do Piauí

Wind Direction in September in Valença do PiauíSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOcteastnorthsouth
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).

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 Valença do Piauí 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 Valença do Piauí

Time Spent in Various Temperature Bands and the Growing Season in September in Valença do PiauíSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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 16comfortablewarmhotsweltering
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 Valença do Piauí are very rapidly increasing during September, increasing by 940°F, from 1,885°F to 2,824°F, over the course of the month.

Growing Degree Days in September in Valença do Piauí

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 Valença do Piauí is essentially constant during September, remaining within 0.2 kWh of 7.2 kWh throughout.

Average Daily Incident Shortwave Solar Energy in September in Valença do Piauí

Average Daily Incident Shortwave Solar Energy in September in Valença do PiauíSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhAugOctSep 17.0 kWhSep 17.0 kWhSep 307.3 kWhSep 307.3 kWhSep 117.2 kWhSep 117.2 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 Valença do Piauí are -6.407 deg latitude, -41.746 deg longitude, and 1,102 ft elevation.

The topography within 2 miles of Valença do Piauí contains only modest variations in elevation, with a maximum elevation change of 358 feet and an average elevation above sea level of 1,103 feet. Within 10 miles contains only modest variations in elevation (1,050 feet). Within 50 miles contains very significant variations in elevation (2,001 feet).

The area within 2 miles of Valença do Piauí is covered by shrubs (40%), trees (33%), and grassland (21%), within 10 miles by trees (51%) and shrubs (34%), and within 50 miles by trees (42%) and shrubs (40%).

This report illustrates the typical weather in Valença do Piauí, 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 is only a single weather station, Teresina Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Valença do Piauí.

At a distance of 192 kilometers from Valença do Piauí, further than our threshold of 150 kilometers, this station is deemed insufficiently nearby to be relied upon as our primary source for temperature and dew point records. Consequently, the station records are blended with interpolated values from NASA's MERRA-2 satellite-era reanalysis , and both are corrected for elevation differences according to the International Standard Atmosphere .

The weight assigned to the MERRA-2 value depends on the distance from Valença do Piauí to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 45%, making the weight assigned to the weather station 55%.

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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