Alpharetta weather in August

In August, Alpharetta sees average daytime highs of 87°F and overnight lows near 70°F, with 4.1 in of rain across 12.7 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 Alpharetta's 8th-clearest and 12th-windiest month. For the whole year in context, see Alpharetta's year-round climate.

Daytime high
87°
2nd warmest
Overnight low
70°
11th coldest
Rainfall
4.1 in
12.7 wet days
Daylight
13 h 18 min
6:03 AM – 7:20 PM
Cloud cover
59%
8th clearest
Wind
5 mph
12th windiest
Solar energy
5.41 kWh/m²
Travel score
4.5
out of 10

Alpharetta is city in north Fulton County, Georgia, United States.

Density
901/km²
people per km²
Founded
1858

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 Alpharetta 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 80°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
68771
78771
88771
98771
108771
118771
128771
138771
148771
158770
168770
178770
188770
198770
208770
218770
228670
238670
248670
258669
268669
278669
288569
298569
308569
318568

How August really feels in Alpharetta

Once humidity and wind are folded in, August averages 21 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
21
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.

Alpharetta 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° / 34°4.610.40.7102.8
Feb56° / 37°4.6100.510.73.7
Mar64° / 44°4.710.30.111.75.6
Apr72° / 51°4.09.6012.86.7
May79° / 60°3.49.8013.76.7
Jun85° / 68°4.113.7014.24.8
Jul88° / 71°4.114.60144.1
Aug87° / 70°4.112.7013.34.5
Sep82° / 64°3.68.7012.26.4
Oct72° / 53°3.47.2011.17.3
Nov62° / 42°3.98.5010.25.6
Dec54° / 37°4.610.30.39.83.3

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 20% of August, with mostly cloudy or overcast conditions the remaining 51%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14852
24852
34753
44654
54654
64654
74654
84555
94654
104654
114753
124654
134753
144753
154852
164852
174951
185050
195050
205149
215248
225248
235149
245248
255248
265248
275248
285248
295248
305248
315248

Chance of precipitation in August

Any precipitation

Alpharetta gets around 4.1 in of rain over 12.7 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 (%)
144
244
344
444
544
644
744
844
945
1045
1145
1245
1345
1444
1544
1643
1742
1842
1941
2040
2140
2239
2339
2438
2538
2637
2737
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 41% of days. Sticky, muggy-or-worse air turns up on roughly 78% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
114103847
214103946
314113945
415113944
515114044
615114043
715114042
816114142
916114141
1016124141
1116124140
1216124140
1316134139
1416134139
1516144138
1616154138
1716154137
1816164136
1916164136
2015174135
2115174135
2215184135
2315184234
2415184233
2515194233
2615194332
2716194331
2826204329
2927214328
3027214327
3128224225

Wind in August

Winds average 5 mph in August, the calmest month.

Across August, 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.

0246810151015202531
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
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 5:52 AM to 6:14 AM, and sunset from 7:35 PM to 7:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:527:35
213.75:527:34
313.75:537:33
413.65:547:32
513.65:557:31
613.65:557:30
713.65:567:29
813.55:577:28
913.55:587:27
1013.55:587:26
1113.45:597:25
1213.46:007:24
1313.46:017:23
1413.36:017:22
1513.36:027:21
1613.36:037:20
1713.26:047:19
1813.26:047:17
1913.26:057:16
2013.26:067:15
2113.16:077:14
2213.16:077:12
2313.16:087:11
2413.06:097:10
2513.06:097:09
2613.06:107:07
2712.96:117:06
2812.96:127:05
2912.86:127:03
3012.86:137:02
3112.86:147:01

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.41 kWh/m².

For context, solar energy here swings from a low near 2.29 kWh/m² to a high of 6.05 kWh/m² in May across the year — August's 5.41 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
195.4Bright
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 Alpharetta?

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

4.5
Sightseeing
8th-best month of the year
6.3
Beach & pool
3rd-best month of the year

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

What to pack for Alpharetta in August

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

In August, Alpharetta 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 Alpharetta 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 Alpharetta peaks around July 10 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 highHighModerateJul 10UV 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 Alpharetta 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 Alpharetta 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 Alpharetta?

Alpharetta sits at 34.1°N, 84.3°W, 1,138 ft above sea level, in United States. The nearest listed city is Milton, 3.7 mi away.

Topography around Alpharetta

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

Within 2 miles, the terrain around Alpharetta has only modest variations in elevation — a maximum elevation change of 269 ft around an average of 1,102 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 853 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,848 ft.

The land around Alpharetta is covered by trees (55%) and artificial surfaces (37%) within 2 miles, trees (71%) within 10 miles, and trees (82%) within 50 miles.

2 miles
269 ft
10 miles
853 ft
50 miles
3,848 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Milton 3.7 mi · Roswell 5.6 mi · Johns Creek 6.2 mi · Peachtree Corners 8.1 mi · Dunwoody 9.3 mi · Duluth 9.9 mi · Norcross 11 mi · Sandy Springs 12 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 Alpharetta (34.0754°, -84.2941°, elevation 1,138 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).