St. Marys weather in August

In August, St. Marys sees average daytime highs of 87°F and overnight lows near 76°F, with 5.8 in of rain across 20.4 wet days and about 13.1 hours of daylight. It is the 2nd-warmest and 1st-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 23% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 13 h 30 min at the start of August to 12 h 42 min by month's end. Set against the rest of the year, August is St. Marys's 12th-clearest and 11th-windiest month. For the whole year in context, see St. Marys's year-round climate.

Daytime high
87°
2nd warmest
Overnight low
76°
12th coldest
Rainfall
5.8 in
20.4 wet days
Daylight
13 h 06 min
5:57 AM – 7:04 PM
Cloud cover
63%
12th clearest
Wind
7 mph
11th windiest
Solar energy
5.46 kWh/m²
Travel score
3.7
out of 10

St. Marys is city in Camden County, Georgia, USA.

Density
279/km²
people per km²
Founded
1792

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 St. Marys reaches about 87°F in the afternoon and slips back to 76°F overnight — a 10°F spread between the day's warmth and the night's chill. On most days the high lands between 83°F and 91°F. Set against its neighbours, August runs on par with July and about 3°F warmer than September.

70°80°90°151015202531
Avg high (°F)Avg low (°F)
18777
28777
38777
48776
58776
68776
78776
88776
98776
108776
118776
128776
138776
148776
158776
168776
178776
188776
198776
208776
218776
228676
238676
248676
258676
268676
278676
288676
298676
308676
318576

How August really feels in St. Marys

Once humidity and wind are folded in, August averages 31 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
31
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.

St. Marys weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan62° / 48°2.97.710.25.7
Feb65° / 50°2.57.210.96.2
Mar70° / 55°2.87.311.87.0
Apr75° / 61°2.36.912.77.5
May82° / 68°2.58.513.56.6
Jun86° / 74°5.117.5144.3
Jul88° / 76°4.618.213.83.7
Aug87° / 76°5.820.413.13.7
Sep83° / 74°5.415.512.25.0
Oct78° / 66°3.28.911.27.1
Nov70° / 57°1.86.110.47.2
Dec64° / 51°2.57.4106.3

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in August, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 21% of August, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14258
24258
34258
44258
54258
64357
74357
84258
94258
104357
114357
124357
134357
144258
154357
164258
174357
184456
194456
204456
214555
224555
234555
244555
254555
264654
274654
284654
294654
304654
314654

Chance of precipitation in August

Any precipitation

St. Marys gets around 5.8 in of rain over 20.4 wet days in August, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 65% and peaks near 66% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
165
265
365
465
565
665
765
865
965
1065
1165
1265
1365
1465
1566
1666
1766
1866
1966
2066
2166
2266
2366
2466
2566
2665
2765
2865
2964
3064
3163

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the oppressive band about 61% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1016534
2016534
3026434
4026335
5026335
6026236
7026137
8026137
9026038
10026038
11026038
12025939
13025939
14025939
15035938
16035938
17035938
18036037
19045937
20046036
21046135
22056035
23056134
24066034
25066133
26076132
27176131
28186130
29186229
30196327
312106226

Wind in August

Winds average 7 mph in August.

Across August, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287light breeze
298light breeze
308light breeze
318light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 30 min at the start of August to 12 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 48 minutes over August. Sunrise moves from 5:47 AM to 6:06 AM, and sunset from 7:17 PM to 6:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:477:17
213.55:487:17
313.55:487:16
413.45:497:15
513.45:507:14
613.45:507:13
713.45:517:13
813.35:527:12
913.35:527:11
1013.35:537:10
1113.35:537:09
1213.25:547:08
1313.25:557:07
1413.25:557:06
1513.25:567:05
1613.15:577:04
1713.15:577:03
1813.15:587:02
1913.05:587:01
2013.05:597:00
2113.06:006:59
2213.06:006:58
2312.96:016:56
2412.96:016:55
2512.96:026:54
2612.86:036:53
2712.86:036:52
2812.86:046:50
2912.76:046:49
3012.76:056:48
3112.76:066:47

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.46 kWh/m².

For context, solar energy here swings from a low near 2.74 kWh/m² to a high of 6.45 kWh/m² in May across the year — August's 5.46 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.6Bright
115.6Bright
125.6Bright
135.6Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.4Bright
205.4Bright
215.4Bright
225.3Bright
235.3Bright
245.3Bright
255.3Bright
265.2Bright
275.2Bright
285.2Bright
295.1Bright
305.1Bright
315.1Bright
Planning a trip in August

Hazard calendar for St. Marys

In seasonPeak

In August, St. Marys sits inside its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.

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

St. Marys's rainy season runs June–October, when most of the year's rain falls.

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

Is August a good time to visit St. Marys?

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

3.7
Sightseeing
11th-best month of the year
5.2
Beach & pool
7th-best month of the year

August is a weaker month for outdoor sightseeing in St. Marys.

What to pack for St. Marys in August

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

In August, St. Marys sees daytime highs around 87°F and nights near 76°F. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

Sea temperature near St. Marys in August

The nearest coast averages about 83°F in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 12 mi away) is warmest in August at about 83°F and coldest in February near 60°F.

It's comfortable for a long swim from Apr 15 to Nov 24 — about 7.4 months when the water holds above 68°F.

60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan61Cool
Feb60Cool
Mar63Cool
Apr68Refreshing
May75Refreshing
Jun80Warm
Jul82Warm
Aug83Tropical
Sep82Warm
Oct77Warm
Nov70Refreshing
Dec64Cool

UV index in St. Marys in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in St. Marys peaks around June 22 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 22UV 10Dec 19UV 3
UV index (midday)Level
Jan4Moderate
Feb6High
Mar7High
Apr7High
May8Very high
Jun10Extreme
Jul10Very high
Aug9Very high
Sep8Very high
Oct6High
Nov5Moderate
Dec3Moderate

Air quality in St. Marys 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 St. Marys is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (December, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1618 µg/m³Dec 127 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb13Moderate
Mar14Moderate
Apr14Moderate
May15Moderate
Jun16Moderate
Jul18Moderate
Aug16Moderate
Sep11Good
Oct8Good
Nov7Good
Dec7Good
Location & terrain

Where is St. Marys?

St. Marys sits at 30.7°N, 81.5°W, 10 ft above sea level, in United States. The nearest listed city is Kingsland, 9.9 mi away.

Topography around St. Marys

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

Within 2 miles, the terrain around St. Marys has only modest variations in elevation — a maximum elevation change of 79 ft around an average of 10 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 125 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 295 ft.

The land around St. Marys is covered by wetland (41%), trees (25%) and water (23%) within 2 miles, trees (43%) and water (26%) within 10 miles, and trees (58%) and water (29%) within 50 miles.

2 miles
79 ft
10 miles
125 ft
50 miles
295 ft
treesgrasslandartificial surfaceswaterwetland
August weather nearby: Kingsland 9.9 mi · Jacksonville 29 mi · Brunswick 29 mi · Jacksonville Beach 32 mi · Ponte Vedra Beach 35 mi · Palm Valley 39 mi · Oakleaf Plantation 42 mi · Fruit Cove 43 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 St. Marys (30.7305°, -81.5465°, elevation 10 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). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).