Suwanee weather in August

In August, Suwanee sees average daytime highs of 87°F and overnight lows near 70°F, with 4.2 in of rain across 12.8 wet days and about 13.3 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 87°F through the month. The sky is clear or mostly clear about 29% of the time in August, and the air most often feels muggy.

Daylight stretches from about 13 h 42 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Suwanee's 9th-clearest and 12th-windiest month. For the whole year in context, see Suwanee's year-round climate.

Daytime high
87°
2nd warmest
Overnight low
70°
11th coldest
Rainfall
4.2 in
12.8 wet days
Daylight
13 h 18 min
6:02 AM – 7:19 PM
Cloud cover
59%
9th clearest
Wind
5 mph
12th windiest
Solar energy
5.4 kWh/m²
Travel score
4.4
out of 10

Suwanee is city in Gwinnett County, Georgia, U.S..

Density
659/km²
people per km²

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 87°F through the month.

A typical August day in Suwanee reaches about 87°F in the afternoon and slips back to 70°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 81°F and 93°F. Set against its neighbours, August runs on par with July and about 5°F warmer than September.

60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18871
28871
38871
48871
58871
68871
78871
88871
98771
108771
118771
128771
138771
148771
158771
168770
178770
188770
198770
208770
218770
228770
238670
248670
258669
268669
278669
288669
298569
308569
318568

How August really feels in Suwanee

Once humidity and wind are folded in, August averages 23 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
23
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Suwanee weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan52° / 35°4.610.40.6102.9
Feb56° / 37°4.69.90.510.73.8
Mar64° / 44°4.6100.111.75.7
Apr72° / 51°3.99.5012.86.8
May79° / 60°3.49.8013.76.7
Jun85° / 68°4.113.7014.24.8
Jul88° / 71°4.014.90144.0
Aug87° / 70°4.212.8013.34.4
Sep82° / 64°3.68.7012.26.4
Oct72° / 53°3.47.2011.17.3
Nov62° / 42°3.98.4010.25.7
Dec54° / 37°4.510.30.39.83.4

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 21% of August, with mostly cloudy or overcast conditions the remaining 50%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14951
24852
34753
44753
54753
64753
74852
84852
94753
104753
114753
124753
134852
144951
154951
164951
175050
185149
195149
205248
215248
225248
235248
245347
255248
265248
275248
285248
295347
305347
315347

Chance of precipitation in August

Any precipitation

Suwanee gets around 4.2 in of rain over 12.8 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 45% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
145
245
345
445
545
645
745
845
945
1045
1145
1245
1344
1444
1543
1642
1742
1841
1940
2040
2139
2239
2338
2438
2537
2637
2736
2836
2935
3034
3134

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the muggy band about 42% of days. Sticky, muggy-or-worse air turns up on roughly 79% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1131038480
2141039470
3141039460
4141040450
5141040440
6141041430
7141041430
8151141420
9151141420
10151141411
11151141411
12151241401
13151241401
14141341391
15141441391
16141441381
17141541371
18141641371
19141642361
20141742351
21141742351
22141843341
23141843331
24141843331
25141944321
26141944310
27152044300
28252144290
29262143280
30262243260
31272343250

Wind in August

Winds average 5 mph in August, the calmest month.

Across August, daily wind ranges from about 4 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 42 min at the start of August to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 54 minutes over August. Sunrise moves from 5:51 AM to 6:13 AM, and sunset from 7:34 PM to 7:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:517:34
213.75:527:33
313.75:527:32
413.65:537:31
513.65:547:30
613.65:557:29
713.65:557:28
813.55:567:27
913.55:577:26
1013.55:587:25
1113.45:587:24
1213.45:597:23
1313.46:007:22
1413.36:017:21
1513.36:017:20
1613.36:027:19
1713.26:037:18
1813.26:037:16
1913.26:047:15
2013.26:057:14
2113.16:067:13
2213.16:067:12
2313.16:077:10
2413.06:087:09
2513.06:097:08
2613.06:097:06
2712.96:107:05
2812.96:117:04
2912.86:117:02
3012.86:127:01
3112.86:137:00

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.4 kWh/m².

For context, solar energy here swings from a low near 2.3 kWh/m² to a high of 6.07 kWh/m² in June across the year — August's 5.4 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.4Bright
165.4Bright
175.4Bright
185.4Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.1Bright
295.1Bright
305.1Bright
315.1Bright
Planning a trip in August

Is August a good time to visit Suwanee?

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

4.4
Sightseeing
8th-best month of the year
6.3
Beach & pool
3rd-best month of the year

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

What to pack for Suwanee in August

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

In August, Suwanee sees daytime highs around 87°F and nights near 70°F. Pack light clothes. Worth having: rain gear and sun protection. About 13 days see rain.

light clothesrain gearsun protection

UV index in Suwanee in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Suwanee 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 Suwanee in August

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Suwanee is worst in July — around 21 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (January, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1621 µg/m³Jan 118 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb11Good
Mar13Moderate
Apr12Moderate
May15Moderate
Jun18Moderate
Jul21Moderate
Aug18Moderate
Sep13Moderate
Oct11Good
Nov10Good
Dec8Good
Location & terrain

Where is Suwanee?

Suwanee sits at 34.1°N, 84.1°W, 1,001 ft above sea level, in United States. The nearest listed city is Sugar Hill, 4.3 mi away.

Topography around Suwanee

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

Within 2 miles, the terrain around Suwanee has only modest variations in elevation — a maximum elevation change of 279 ft around an average of 1,030 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 797 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 3,950 ft.

The land around Suwanee is covered by trees (59%) and artificial surfaces (31%) within 2 miles, trees (61%) and artificial surfaces (25%) within 10 miles, and trees (82%) within 50 miles.

2 miles
279 ft
10 miles
797 ft
50 miles
3,950 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Sugar Hill 4.3 mi · Duluth 5.6 mi · Johns Creek 7.5 mi · Lawrenceville 8.1 mi · Peachtree Corners 11 mi · Norcross 11 mi · Alpharetta 13 mi · Snellville 14 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 Suwanee (34.0515°, -84.0713°, elevation 1,001 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. 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).