Gainesville weather in September

In September, Gainesville sees average daytime highs of 82°F and overnight lows near 64°F, with 3.7 in of rain across 8.2 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 85°F in the first days to 78°F by the end. The sky is clear or mostly clear about 39% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Gainesville's 3rd-clearest and 9th-windiest month. For the whole year in context, see Gainesville's year-round climate.

Daytime high
82°
4th warmest
Overnight low
64°
9th coldest
Rainfall
3.7 in
8.2 wet days
Daylight
12 h 12 min
6:23 AM – 6:36 PM
Cloud cover
53%
3rd clearest
Wind
5 mph
9th windiest
Solar energy
4.59 kWh/m²
Travel score
6.5
out of 10

Gainesville is county seat of Hall County, Georgia, United States.

Density
428/km²
people per km²
Founded
1818

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 85°F in the first days to 78°F by the end.

A typical September day in Gainesville reaches about 82°F in the afternoon and slips back to 64°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 74°F and 89°F. Set against its neighbours, September runs about 5°F cooler than August and about 10°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18568
28567
38567
48467
58467
68466
78466
88466
98366
108365
118365
128365
138265
148264
158264
168264
178163
188163
198163
208062
218062
228062
237961
247961
257961
267860
277860
287860
297759
307759

How September really feels in Gainesville

Once humidity and wind are folded in, September averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Gainesville weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan52° / 35°4.910.50.7102.8
Feb56° / 37°4.610.10.710.73.7
Mar64° / 44°4.89.90.111.75.7
Apr71° / 51°4.09.3012.86.8
May79° / 60°3.59.5013.86.8
Jun85° / 67°3.913.2014.24.9
Jul88° / 71°3.813.5014.14.1
Aug87° / 70°4.212013.34.6
Sep82° / 64°3.78.2012.26.5
Oct72° / 52°3.66.9011.17.3
Nov62° / 42°4.08.6010.25.6
Dec54° / 37°4.810.20.39.83.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 43%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25446
35545
45545
55545
65743
75743
85743
95743
105842
115743
125842
135743
145743
155743
165743
175743
185644
195644
205545
215545
225644
235743
245743
255842
265842
275941
285941
295941
305941

Chance of precipitation in September

Any precipitation

Gainesville gets around 3.7 in of rain over 8.2 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 27% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
130
230
329
428
528
627
726
826
925
1025
1124
1224
1325
1425
1525
1626
1726
1827
1927
2028
2128
2228
2328
2428
2528
2627
2727
2827
2926
3026

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the muggy band about 30% of days. Sticky, muggy-or-worse air turns up on roughly 40% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
138244421
239254320
3410254219
4411264118
5511274017
6612283815
7613293714
8714303613
9815303512
10916303411
111016303311
121117303210
13121730319
14131830319
15141830308
16141930298
17151930288
18161929287
19171929277
20191929267
21201929266
22222028256
23232027245
24252027235
25272026234
26292026224
27302125213
28322124203
29332124193
30352123182

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 5 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 6:12 AM to 6:34 AM, and sunset from 6:58 PM to 6:16 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:126:58
212.76:136:56
312.76:146:55
412.66:156:53
512.66:156:52
612.66:166:50
712.56:176:49
812.56:186:48
912.56:186:46
1012.46:196:45
1112.46:206:43
1212.46:206:42
1312.36:216:40
1412.36:226:39
1512.26:236:37
1612.26:236:36
1712.26:246:34
1812.16:256:33
1912.16:256:32
2012.16:266:30
2112.06:276:29
2212.06:286:27
2312.06:286:26
2411.96:296:24
2511.96:306:23
2611.86:316:21
2711.86:316:20
2811.86:326:18
2911.76:336:17
3011.76:346:16

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.59 kWh/m².

For context, solar energy here swings from a low near 2.3 kWh/m² to a high of 6.08 kWh/m² in June across the year — September's 4.59 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.7Bright
144.7Bright
154.6Bright
164.6Bright
174.5Bright
184.5Bright
194.5Bright
204.4Bright
214.4Bright
224.4Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.2Bright
284.2Bright
294.2Bright
304.2Bright
Planning a trip in September

Hazard calendar for Gainesville

In seasonPeak

In September, Gainesville sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Gainesville sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Gainesville?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.5
Sightseeing
4th-best month of the year
7.0
Beach & pool
1st-best month of the year

September is a reasonable time to visit Gainesville for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Gainesville in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Gainesville sees daytime highs around 82°F and nights near 64°F. Pack light clothes. Worth having: rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

UV index in Gainesville in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Gainesville peaks around June 23 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 23UV 10Dec 20UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug8Very high
Sep7Very high
Oct5High
Nov4Moderate
Dec3Moderate

Air quality in Gainesville in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Gainesville is worst in July — around 19 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (January, 6 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1618 µg/m³Jan 106 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar11Good
Apr12Good
May13Moderate
Jun16Moderate
Jul19Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov8Good
Dec6Good
Location & terrain

Where is Gainesville?

Gainesville sits at 34.3°N, 83.8°W, 1,250 ft above sea level, in United States. The nearest listed city is Sugar Hill, 18 mi away.

Topography around Gainesville

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Gainesville.

Within 2 miles, the terrain around Gainesville has only modest variations in elevation — a maximum elevation change of 302 ft around an average of 1,234 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 804 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,324 ft.

The land around Gainesville is covered by trees (57%) and artificial surfaces (32%) within 2 miles, trees (71%) within 10 miles, and trees (83%) within 50 miles.

2 miles
302 ft
10 miles
804 ft
50 miles
4,324 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Sugar Hill 18 mi · Winder 22 mi · Suwanee 22 mi · Lawrenceville 25 mi · Duluth 27 mi · Johns Creek 29 mi · Milton 30 mi · Alpharetta 31 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Gainesville (34.2979°, -83.8241°, elevation 1,250 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).