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September Weather in Unionville Georgia, United States

Daily high temperatures decrease by 6°F, from 88°F to 82°F, rarely falling below 74°F or exceeding 93°F.

Daily low temperatures decrease by 7°F, from 71°F to 64°F, rarely falling below 55°F or exceeding 74°F.

For reference, on July 20, the hottest day of the year, temperatures in Unionville typically range from 73°F to 91°F, while on January 17, the coldest day of the year, they range from 41°F to 60°F.

Average High and Low Temperature in September in Unionville

Average High and Low Temperature in September in UnionvilleSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303040°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°F100°F100°FAugOctSep 188°FSep 188°F71°F71°FSep 3082°FSep 3082°F64°F64°FSep 1186°FSep 1186°F69°F69°FSep 2184°FSep 2184°F66°F66°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 Unionville

Average Hourly Temperature in September in UnionvilleSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOctcoolcoolcomfortablewarmwarmhot
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.

Mezzouna, Tunisia (5,204 miles away); Adana, Turkey (6,284 miles); and Udhampur, India (7,785 miles) are the far-away foreign places with temperatures most similar to Unionville (view comparison).

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The month of September in Unionville experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 45% to 37%.

The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 63% of the time.

For reference, on July 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 55%, while on October 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.

Cloud Cover Categories in September in Unionville

Cloud Cover Categories in September in UnionvilleSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctSep 155%Sep 155%Sep 3063%Sep 3063%Sep 1156%Sep 1156%Sep 2161%Sep 2161%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 Unionville, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 39% and ending it at 25%.

For reference, the year's highest daily chance of a wet day is 54% on July 29, and its lowest chance is 16% on October 29.

Probability of Precipitation in September in Unionville

Probability of Precipitation in September in UnionvilleSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%50%50%55%55%AugOctSep 139%Sep 139%Sep 3025%Sep 3025%Sep 1135%Sep 1135%Sep 2128%Sep 2128%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 Unionville is decreasing, starting the month at 3.6 inches, when it rarely exceeds 6.5 inches or falls below 1.5 inches, and ending the month at 2.6 inches, when it rarely exceeds 5.9 inches or falls below 0.7 inches.

Average Monthly Rainfall in September in Unionville

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 Unionville, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 55 minutes, implying an average daily decrease of 1 minute, 53 seconds, and weekly decrease of 13 minutes, 11 seconds.

The shortest day of the month is September 30, with 11 hours, 52 minutes of daylight and the longest day is September 1, with 12 hours, 47 minutes of daylight.

Hours of Daylight and Twilight in September in Unionville

Hours of Daylight and Twilight in September in UnionvilleSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 9 minSep 2212 hr, 9 minnightnightdaydaySep 112 hr, 47 minSep 112 hr, 47 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 earliest sunrise of the month in Unionville is 7:10 AM on September 1 and the latest sunrise is 17 minutes later at 7:27 AM on September 30.

The latest sunset is 7:56 PM on September 1 and the earliest sunset is 37 minutes earlier at 7:19 PM on September 30.

Daylight saving time is observed in Unionville during 2024, but it neither starts nor ends during September, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 6:29 AM and sets 14 hours, 12 minutes later, at 8:41 PM, while on December 21, the shortest day of the year, it rises at 7:29 AM and sets 10 hours, 6 minutes later, at 5:35 PM.

Sunrise & Sunset with Twilight in September in Unionville

Sunrise & Sunset with Twilight in September in UnionvilleSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMAugOct7:10 AM7:10 AMSep 17:56 PMSep 17:56 PM7:27 AM7:27 AMSep 307:19 PMSep 307:19 PM7:16 AM7:16 AMSep 117:44 PMSep 117:44 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 Unionville

Solar Elevation and Azimuth in September in UnionvilleSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOct001010202020303040405050607000010102020303030404050506060
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 Unionville

Moon Rise, Set & Phases in September in UnionvilleSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 47:14 AMAug 47:14 AMAug 192:26 PMAug 192:26 PMSep 29:56 PMSep 29:56 PMSep 1710:35 PMSep 1710:35 PMOct 22:50 PMOct 22:50 PMOct 177:27 AMOct 177:27 AM6:49 AM6:49 AM8:58 PM8:58 PM8:30 PM8:30 PM7:52 AM7:52 AM6:39 AM6:39 AM7:58 PM7:58 PM7:32 PM7:32 PM7:49 AM7:49 AM7:16 AM7:16 AM7:16 PM7:16 PM6:31 PM6:31 PM7:45 AM7:45 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%5:41 AMENE7:30 PMWNW-12:39 PMS249,168 mi
2
0%6:39 AMENE7:58 PMWNW-1:21 PMS250,566 mi
3
0%7:34 AME8:23 PMW-2:00 PMS251,603 mi
4
3%8:28 AME8:47 PMW-2:39 PMS252,235 mi
5
7%9:21 AME9:12 PMW-3:17 PMS252,398 mi
6
12%10:15 AMESE9:37 PMWSW-3:57 PMS252,018 mi
7
19%11:11 AMESE10:06 PMWSW-4:38 PMS251,021 mi
8
28%12:08 PMESE10:38 PMWSW-5:23 PMS249,348 mi
9
37%1:07 PMESE11:16 PMWSW-6:11 PMS246,980 mi
10
47%2:08 PMESE--7:04 PMS243,948 mi
11
50%-12:01 AMWSW3:08 PMSE8:01 PMS240,358 mi
12
68%-12:54 AMSW4:05 PMSE9:00 PMS236,400 mi
13
78%-1:56 AMWSW4:57 PMESE10:00 PMS232,351 mi
14
87%-3:03 AMWSW5:42 PMESE10:59 PMS228,550 mi
15
94%-4:14 AMWSW6:22 PMESE11:54 PMS225,364 mi
16
97%-5:26 AMWSW6:58 PMESE--
17
100%-6:38 AMW7:32 PME12:47 AMS223,124 mi
18
100%-7:49 AMW8:04 PME1:39 AMS222,071 mi
19
98%-9:00 AMW8:38 PMENE2:29 AMS222,312 mi
20
93%-10:11 AMWNW9:14 PMENE3:21 AMS223,795 mi
21
85%-11:24 AMWNW9:54 PMENE4:15 AMS226,324 mi
22
76%-12:35 PMWNW10:41 PMENE5:11 AMS229,605 mi
23
65%-1:43 PMWNW11:34 PMNE6:10 AMS233,298 mi
24
50%-2:45 PMNW-7:09 AMS237,075 mi
25
42%12:32 AMNE3:39 PMWNW-8:07 AMS240,668 mi
26
32%1:33 AMENE4:24 PMWNW-9:01 AMS243,884 mi
27
23%2:35 AMENE5:02 PMWNW-9:52 AMS246,613 mi
28
15%3:35 AMENE5:34 PMWNW-10:38 AMS248,811 mi
29
9%4:33 AMENE6:02 PMWNW-11:20 AMS250,478 mi
30
4%5:29 AME6:28 PMW-12:00 PMS251,643 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 Unionville is very rapidly decreasing during September, falling from 84% to 48% over the course of the month.

For reference, on July 25, the muggiest day of the year, there are muggy conditions 95% of the time, while on January 24, the least muggy day of the year, there are muggy conditions 1% of the time.

Humidity Comfort Levels in September in Unionville

Humidity Comfort Levels in September in UnionvilleSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOctSep 184%Sep 184%Sep 3048%Sep 3048%Sep 1174%Sep 1174%Sep 2160%Sep 2160%miserablemiserableoppressiveoppressivemuggymuggyhumidhumiddrydrycomfortablecomfortable
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 Unionville is increasing during September, increasing from 6.4 miles per hour to 7.5 miles per hour over the course of the month.

For reference, on March 7, the windiest day of the year, the daily average wind speed is 9.0 miles per hour, while on August 7, the calmest day of the year, the daily average wind speed is 5.9 miles per hour.

Average Wind Speed in September in Unionville

Average Wind Speed in September in UnionvilleSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphAugOctSep 16.4 mphSep 16.4 mphSep 307.5 mphSep 307.5 mphSep 116.8 mphSep 116.8 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 Unionville throughout September is predominantly from the east, with a peak proportion of 48% on September 7.

Wind Direction in September in Unionville

Wind Direction in September in UnionvilleWESep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOctwesteastnorthsouth
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).

The growing season in Unionville typically lasts for 9.6 months (291 days), from around February 19 to around December 6, rarely starting before January 27 or after March 12, and rarely ending before November 13 or after December 30.

The month of September in Unionville is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in September in Unionville

Time Spent in Various Temperature Bands and the Growing Season in September in Unionvillegrowing seasongrowing seasongrowing seasonSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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 16coldcoolcomfortablewarmhot
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 Unionville are rapidly increasing during September, increasing by 731°F, from 4,550°F to 5,281°F, over the course of the month.

Growing Degree Days in September in Unionville

Growing Degree Days in September in UnionvilleSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930304,400°F4,400°F4,600°F4,600°F4,800°F4,800°F5,000°F5,000°F5,200°F5,200°F5,400°F5,400°FAugOctSep 14,550°FSep 14,550°FSep 305,281°FSep 305,281°FSep 114,820°FSep 114,820°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 Unionville is essentially constant during September, remaining within 0.2 kWh of 5.3 kWh throughout.

Average Daily Incident Shortwave Solar Energy in September in Unionville

Average Daily Incident Shortwave Solar Energy in September in UnionvilleSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhAugOctSep 15.5 kWhSep 15.5 kWhSep 305.1 kWhSep 305.1 kWhSep 115.3 kWhSep 115.3 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 Unionville are 31.435 deg latitude, -83.510 deg longitude, and 348 ft elevation.

The topography within 2 miles of Unionville contains only modest variations in elevation, with a maximum elevation change of 108 feet and an average elevation above sea level of 327 feet. Within 10 miles also contains only modest variations in elevation (194 feet). Within 50 miles also contains only modest variations in elevation (417 feet).

The area within 2 miles of Unionville is covered by artificial surfaces (84%) and cropland (16%), within 10 miles by cropland (70%) and artificial surfaces (14%), and within 50 miles by cropland (49%) and trees (37%).

This report illustrates the typical weather in Unionville, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Unionville.

For each station, the records are corrected for the elevation difference between that station and Unionville 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 Unionville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Unionville 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 Unionville 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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