Westford weather in August

In August, Westford sees average daytime highs of 81°F and overnight lows near 62°F, with 3.4 in of rain across 9.6 wet days and about 13.7 hours of daylight. It is the 2nd-warmest and 6th-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 31% of the time in August, and the air most often feels comfortable.

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 Westford's 4th-clearest and 12th-windiest month. For the whole year in context, see Westford's year-round climate.

Daytime high
81°
2nd warmest
Overnight low
62°
11th coldest
Rainfall
3.4 in
9.6 wet days
Daylight
13 h 42 min
4:57 AM – 6:42 PM
Cloud cover
57%
4th clearest
Wind
6 mph
12th windiest
Solar energy
5.21 kWh/m²
Travel score
6.5
out of 10

Westford is town in Middlesex County, Massachusetts, United States.

Founded
1635

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 Westford reaches about 81°F in the afternoon and slips back to 62°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 72°F and 90°F. Set against its neighbours, August runs about 2°F cooler than July and about 8°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18364
28364
38264
48264
58264
68264
78264
88264
98264
108264
118264
128263
138163
148163
158163
168163
178163
188162
198162
208162
218062
228062
238062
248061
258061
268061
278061
287960
297960
307960
317960

How August really feels in Westford

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.

Westford weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan35° / 20°3.29.66.29.20.0
Feb37° / 22°3.08.55.710.30.0
Mar45° / 29°4.111.15.111.61.1
Apr57° / 39°3.610.51.213.14.0
May67° / 49°3.110.5014.46.0
Jun77° / 58°3.510.7015.16.5
Jul83° / 64°3.210.3014.85.8
Aug81° / 62°3.49.6013.76.5
Sep73° / 55°3.48012.37.0
Oct61° / 44°3.79.30.210.85.3
Nov50° / 34°3.39.11.19.62.3
Dec40° / 26°4.110.358.90.1

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% 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 49%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15050
25050
35050
44951
55050
65050
75050
84852
94951
104852
114852
124852
134852
144753
154753
164852
174852
184951
195149
205149
215149
225347
235347
245347
255446
265446
275446
285446
295545
305446
315446

Chance of precipitation in August

Any precipitation

Westford gets around 3.4 in of rain over 9.6 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 (%)
134
234
334
434
534
635
735
835
935
1035
1135
1235
1335
1434
1534
1634
1733
1832
1931
2030
2129
2228
2327
2426
2526
2625
2724
2824
2924
3023
3123

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the comfortable band about 26% of days. Sticky, muggy-or-worse air turns up on roughly 25% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1172230247
2172230247
3172229247
4182329237
5182329237
6182328237
7192328237
8192328237
9192428237
10202427237
11202427227
12202527226
13212526226
14212526225
15212626225
16212626225
17222726214
18222726214
19232726214
20242825203
21252825203
22262824193
23272823193
24282823183
25292822173
26302922173
27312921163
28322921163
29332920153
30342920153
31342820153

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 4:41 AM to 5:14 AM, and sunset from 7:02 PM to 6:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.34:417:02
214.34:427:01
314.34:437:00
414.24:446:59
514.24:466:57
614.24:476:56
714.14:486:55
814.14:496:54
914.04:506:52
1014.04:516:51
1114.04:526:50
1213.94:536:48
1313.94:546:47
1413.84:556:45
1513.84:566:44
1613.74:576:42
1713.74:596:41
1813.75:006:39
1913.65:016:38
2013.65:026:36
2113.55:036:34
2213.55:046:33
2313.45:056:31
2413.45:066:30
2513.35:076:28
2613.35:086:26
2713.35:106:25
2813.25:116:23
2913.25:126:21
3013.15:136:19
3113.15:146:18

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.21 kWh/m².

For context, solar energy here swings from a low near 1.59 kWh/m² to a high of 5.88 kWh/m² in July across the year — August's 5.21 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
284.9Bright
294.9Bright
304.9Bright
314.8Bright
Planning a trip in August

Hazard calendar for Westford

In seasonPeak

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

Westford 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 Westford?

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

6.5
Sightseeing
2nd-best month of the year
6.7
Beach & pool
2nd-best month of the year

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

What to pack for Westford in August

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

In August, Westford sees daytime highs around 81°F and nights near 62°F. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Westford 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 32 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 Westford 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 Westford 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 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 10UV 7Dec 23UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar4Moderate
Apr5High
May7Very high
Jun7Very high
Jul7Very high
Aug5Moderate
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Westford 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 Westford 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 Westford?

Westford sits at 42.6°N, 71.4°W, 397 ft above sea level, in United States. The nearest listed city is Chelmsford, 3.7 mi away.

Topography around Westford

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

Within 2 miles, the terrain around Westford has only modest variations in elevation — a maximum elevation change of 348 ft around an average of 266 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 607 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,176 ft.

The land around Westford is covered by trees (84%) within 2 miles, trees (80%) within 10 miles, and trees (77%) within 50 miles.

2 miles
348 ft
10 miles
607 ft
50 miles
3,176 ft
treesgrasslandcroplandartificial surfaceswaterwetland
August weather nearby: Chelmsford 3.7 mi · Acton 6.2 mi · Lowell 7.5 mi · Billerica 8.7 mi · Dracut 9.3 mi · Concord 9.3 mi · Tewksbury 11 mi · Nashua 13 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 Westford (42.5793°, -71.4378°, elevation 397 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).