Wilton weather in August

In August, Wilton sees average daytime highs of 81°F and overnight lows near 66°F, with 4.1 in of rain across 10.4 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 82°F in the first days to 79°F by the end. The sky is clear or mostly clear about 32% of the time in August, and the air most often feels muggy.

Daylight stretches from about 14 h 12 min at the start of August to 13 hours by month's end. Set against the rest of the year, August is Wilton's 3rd-clearest and 12th-windiest month. For the whole year in context, see Wilton's year-round climate.

Daytime high
81°
2nd warmest
Overnight low
66°
11th coldest
Rainfall
4.1 in
10.4 wet days
Daylight
13 h 42 min
5:08 AM – 6:48 PM
Cloud cover
58%
3rd clearest
Wind
6 mph
12th windiest
Solar energy
5.29 kWh/m²
Travel score
6.4
out of 10

Wilton is town in Fairfield County, Connecticut, United States.

Founded
1802

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 82°F in the first days to 79°F by the end.

A typical August day in Wilton reaches about 81°F in the afternoon and slips back to 66°F overnight — a 15°F spread between the day's warmth and the night's chill. On most days the high lands between 73°F and 88°F. Set against its neighbours, August runs about 2°F cooler than July and about 7°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18368
28368
38368
48268
58268
68267
78267
88267
98267
108267
118267
128167
138167
148167
158167
168166
178166
188166
198066
208066
218065
228065
238065
248065
258065
268065
277965
287964
297964
307964
317964

How August really feels in Wilton

Once humidity and wind are folded in, August 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

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

Wilton weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan37° / 24°3.49.35.39.40.0
Feb39° / 25°3.18.84.410.30.0
Mar47° / 32°4.210.53.711.71.4
Apr58° / 42°3.810.80.613.14.2
May68° / 52°3.511.3014.36.0
Jun78° / 62°3.911.1014.96.5
Jul83° / 67°3.710.9014.75.7
Aug81° / 66°4.110.4013.66.4
Sep74° / 59°3.99.4012.36.9
Oct62° / 48°4.18.80.110.95.5
Nov51° / 38°3.38.50.79.72.7
Dec42° / 30°4.210.13.59.10.3

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 19% 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 (%)
15050
25050
35050
45050
54951
64951
74951
84951
94951
104951
114951
124852
134852
144951
154951
165050
175050
185149
195149
205149
215248
225248
235248
245248
255248
265347
275347
285248
295248
305248
315248

Chance of precipitation in August

Any precipitation

Wilton gets around 4.1 in of rain over 10.4 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 34% and peaks near 38% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
137
236
336
436
536
636
737
837
937
1038
1138
1238
1338
1438
1538
1638
1737
1836
1935
2034
2133
2232
2331
2430
2529
2629
2728
2828
2928
3028
3128

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 27% of days. Sticky, muggy-or-worse air turns up on roughly 40% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11016283214
21116283214
31116273114
41116273114
51216273115
61216273115
71216263115
81216263015
91217253015
101317253015
111317253015
121317253015
131318253014
141318252914
151318252914
161319262913
171319262813
181419262813
191419272712
201420272712
211520272612
221620272511
231721272511
241721272410
251822272310
261922272210
27202227219
28202227219
29212327219
30222327209
31232326209

Wind in August

Winds average 6 mph in August, the calmest month.

Across August, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 12 min at the start of August to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over August. Sunrise moves from 4:53 AM to 5:23 AM, and sunset from 7:07 PM to 6:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.24:537:07
214.24:547:06
314.24:557:05
414.14:567:03
514.14:577:02
614.14:587:01
714.04:597:00
814.05:006:59
913.95:016:57
1013.95:026:56
1113.95:036:55
1213.85:046:53
1313.85:056:52
1413.75:066:51
1513.75:076:49
1613.75:086:48
1713.65:096:46
1813.65:106:45
1913.55:116:43
2013.55:126:42
2113.55:136:40
2213.45:146:39
2313.45:156:37
2413.35:166:36
2513.35:176:34
2613.25:186:32
2713.25:196:31
2813.15:206:29
2913.15:216:27
3013.15:226:26
3113.05:236:24

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.29 kWh/m².

For context, solar energy here swings from a low near 1.7 kWh/m² to a high of 6.05 kWh/m² in June across the year — August's 5.29 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.4Bright
105.4Bright
115.4Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.1Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
304.9Bright
314.9Bright
Planning a trip in August

Hazard calendar for Wilton

In seasonPeak

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

Wilton 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 August a good time to visit Wilton?

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

6.4
Sightseeing
3rd-best month of the year
6.6
Beach & pool
2nd-best month of the year

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

What to pack for Wilton in August

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

In August, Wilton sees daytime highs around 81°F and nights near 66°F. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Wilton in August

The nearest coast averages about 74°F in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 74°F and coldest in February near 35°F.

It's comfortable for a long swim from Jun 30 to Sep 30 — about 3.1 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan39Bracing
Feb35Bracing
Mar37Bracing
Apr44Bracing
May55Bracing
Jun65Cool
Jul72Refreshing
Aug74Refreshing
Sep71Refreshing
Oct64Cool
Nov55Bracing
Dec46Bracing

UV index in Wilton in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Wilton peaks around July 11 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 23 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 11UV 8Dec 23UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Wilton 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 Wilton is worst in July — around 20 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (November, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateJul 1220 µg/m³Nov 1612 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb16Moderate
Mar17Moderate
Apr17Moderate
May18Moderate
Jun19Moderate
Jul20Moderate
Aug17Moderate
Sep16Moderate
Oct13Moderate
Nov11Good
Dec13Moderate
Location & terrain

Where is Wilton?

Wilton sits at 41.2°N, 73.4°W, 249 ft above sea level, in United States. The nearest listed city is New Canaan, 4.3 mi away.

Topography around Wilton

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

Within 2 miles, the terrain around Wilton has only modest variations in elevation — a maximum elevation change of 440 ft around an average of 344 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,024 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,913 ft.

The land around Wilton is covered by trees (87%) within 2 miles, trees (83%) within 10 miles, and trees (61%) and water (24%) within 50 miles.

2 miles
440 ft
10 miles
1,024 ft
50 miles
1,913 ft
treesgrasslandcroplandartificial surfaceswaterwetland
August weather nearby: New Canaan 4.3 mi · Westport 5.6 mi · Norwalk 5.6 mi · East Norwalk 6.8 mi · North Stamford 6.8 mi · Darien 8.1 mi · Fairfield 9.9 mi · Stamford 11 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 Wilton (41.1954°, -73.4379°, elevation 249 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).