Wilmington weather in August

In August, Wilmington sees average daytime highs of 80°F and overnight lows near 63°F, with 3.4 in of rain across 9.5 wet days and about 13.7 hours of daylight. It is the 2nd-warmest and 7th-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 humid.

Daylight stretches from about 14 h 18 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Wilmington's 3rd-clearest and 12th-windiest month. For the whole year in context, see Wilmington's year-round climate.

Daytime high
80°
2nd warmest
Overnight low
63°
11th coldest
Rainfall
3.4 in
9.5 wet days
Daylight
13 h 42 min
4:56 AM – 6:41 PM
Cloud cover
56%
3rd clearest
Wind
6 mph
12th windiest
Solar energy
5.24 kWh/m²
Travel score
6.6
out of 10

Wilmington is town in Middlesex County, Massachusetts, USA.

Density
502/km²
people per km²
Founded
1665

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 Wilmington reaches about 80°F in the afternoon and slips back to 63°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 72°F and 89°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)
18265
28265
38265
48265
58265
68265
78264
88264
98164
108164
118164
128164
138164
148164
158164
168063
178063
188063
198063
208063
218062
228062
238062
248062
257962
267962
277961
287961
297961
307861
317860

How August really feels in Wilmington

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.

Wilmington weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan35° / 21°3.39.66.29.20.0
Feb38° / 22°3.08.65.710.30.0
Mar45° / 30°4.2114.911.61.0
Apr57° / 40°3.710.61.213.13.9
May67° / 49°3.110.5014.46.0
Jun76° / 59°3.410.7015.16.5
Jul82° / 65°3.110.3014.86.1
Aug80° / 63°3.49.5013.76.6
Sep73° / 56°3.38.3012.37.0
Oct62° / 45°3.89.50.210.85.3
Nov50° / 35°3.49.31.19.62.3
Dec40° / 27°4.210.34.78.90.2

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 20% of August, with mostly cloudy or overcast conditions the remaining 48%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15149
25248
35248
45248
55149
65149
75149
85149
95050
105050
114951
124951
134951
144852
154951
165050
175050
185149
195248
205347
215347
225545
235545
245545
255644
265644
275644
285644
295644
305545
315545

Chance of precipitation in August

Any precipitation

Wilmington gets around 3.4 in of rain over 9.5 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 31% and peaks near 35% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
335
434
534
634
734
834
934
1034
1134
1234
1334
1433
1533
1632
1732
1831
1930
2030
2129
2228
2328
2427
2526
2626
2726
2826
2926
3026
3126

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the humid band about 27% of days. Sticky, muggy-or-worse air turns up on roughly 28% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1152130269
2152130269
3162130259
4162129259
5162129249
6162130249
7172130249
8172130249
9172230239
10172229238
11172229238
12182229238
13182329237
14182329237
15182429226
16182529226
17192529226
18192628225
19202628215
20212727214
21222727214
22232726204
23242825194
24252824194
25262824184
26272923174
27282923164
28292922164
29302922164
30312922154
31312921154

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 18 min at the start of August to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over August. Sunrise moves from 4:40 AM to 5:13 AM, and sunset from 7:01 PM to 6:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.34:407:01
214.34:417:00
314.34:426:59
414.24:446:58
514.24:456:56
614.24:466:55
714.14:476:54
814.14:486:52
914.04:496:51
1014.04:506:50
1114.04:516:48
1213.94:526:47
1313.94:536:46
1413.84:546:44
1513.84:556:43
1613.74:566:41
1713.74:586:40
1813.74:596:38
1913.65:006:37
2013.65:016:35
2113.55:026:33
2213.55:036:32
2313.45:046:30
2413.45:056:28
2513.35:066:27
2613.35:076:25
2713.25:096:23
2813.25:106:22
2913.25:116:20
3013.15:126:18
3113.15:136:17

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.24 kWh/m².

For context, solar energy here swings from a low near 1.59 kWh/m² to a high of 5.9 kWh/m² in July across the year — August's 5.24 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.4Bright
65.4Bright
75.4Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.1Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
294.9Bright
304.9Bright
314.8Bright
Planning a trip in August

Hazard calendar for Wilmington

In seasonPeak

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

Wilmington 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 Wilmington?

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

6.6
Sightseeing
2nd-best month of the year
6.7
Beach & pool
2nd-best month of the year

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

What to pack for Wilmington in August

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

In August, Wilmington sees daytime highs around 80°F and nights near 63°F. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Wilmington in August

The nearest coast averages about 66°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 19 mi away) is warmest in August at about 66°F and coldest in February near 38°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°F)Comfort
Jan41Bracing
Feb38Bracing
Mar38Bracing
Apr42Bracing
May50Bracing
Jun58Bracing
Jul65Cool
Aug66Cool
Sep63Cool
Oct56Bracing
Nov50Bracing
Dec46Bracing

UV index in Wilmington in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Wilmington peaks around July 10 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 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 highHighHighModerateLowJul 10UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar4Moderate
Apr5High
May7Very high
Jun7Very high
Jul7Very high
Aug5Moderate
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Wilmington 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 Wilmington is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1715 µg/m³Nov 188 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb13Moderate
Mar13Moderate
Apr13Moderate
May14Moderate
Jun13Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct9Good
Nov8Good
Dec9Good
Location & terrain

Where is Wilmington?

Wilmington sits at 42.5°N, 71.2°W, 89 ft above sea level, in United States. The nearest listed city is Burlington, 3.1 mi away.

Topography around Wilmington

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

Within 2 miles, the terrain around Wilmington has only modest variations in elevation — a maximum elevation change of 190 ft around an average of 128 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 548 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,329 ft.

The land around Wilmington is covered by trees (83%) within 2 miles, trees (78%) within 10 miles, and trees (67%) and water (25%) within 50 miles.

2 miles
190 ft
10 miles
548 ft
50 miles
2,329 ft
treesgrasslandartificial surfaceswaterwetland
August weather nearby: Burlington 3.1 mi · Reading 4.3 mi · Woburn 5.0 mi · Billerica 5.0 mi · Tewksbury 5.6 mi · Wakefield 5.6 mi · Stoneham 6.2 mi · Winchester 6.8 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 Wilmington (42.5465°, -71.1737°, elevation 89 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).