Sudbury weather in April

In April, Sudbury sees average daytime highs of 57°F and overnight lows near 39°F, with 3.6 in of precipitation across 10.5 wet days and about 13.1 hours of daylight. It is the 7th-warmest and 4th-wettest month of the year here.

Highs climb over the month, from about 52°F in the first days to 62°F by the end. The sky is clear or mostly clear about 24% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 24 min at the start of April to 13 h 48 min by month's end. Set against the rest of the year, April is Sudbury's 11th-clearest and 5th-windiest month. For the whole year in context, see Sudbury's year-round climate.

Daytime high
57°
7th warmest
Overnight low
39°
6th coldest
Precipitation
3.6 in
10.5 wet days
Daylight
13 h 06 min
5:11 AM – 6:20 PM
Cloud cover
66%
11th clearest
Wind
8 mph
5th windiest
Solar energy
4.87 kWh/m²
Travel score
4.0
out of 10

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

Founded
1638

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

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 52°F in the first days to 62°F by the end.

A typical April day in Sudbury reaches about 57°F in the afternoon and slips back to 39°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 45°F and 70°F. Set against its neighbours, April runs about 12°F warmer than March and about 10°F cooler than May.

20°40°60°80°151015202530
Avg high (°F)Avg low (°F)
15135
25235
35235
45336
55336
65436
75437
85537
95537
105538
115638
125638
135739
145739
155839
165840
175840
185940
195941
206041
216041
226042
236042
246142
256143
266143
276243
286244
296244
306244

How April really feels in Sudbury

Once humidity and wind are folded in, April averages 0 days that feel above 90°F and 10 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
10
wind chill below the day's low

The story in April is cold — wind chill drags the overnight "feels like" below the raw low.

Sudbury weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan35° / 20°3.29.66.29.30.0
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°3.510.70156.5
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°4.110.3590.1

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13862
23862
33763
43664
53763
63763
73763
83763
93763
103763
113763
123763
133763
143862
153862
163961
173862
183961
193961
203961
213961
223961
233862
243862
253862
263862
273862
283763
293763
303763

Chance of precipitation in April

Any precipitationSnow

Sudbury gets around 3.6 in of rain and snow over 10.5 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 35% and peaks near 38% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%50%151015202530
Rain chance (%)Snow chance (%)
1389
2388
3388
4388
5377
6377
7366
8366
9356
10355
11345
12345
13344
14344
15344
16343
17343
18343
19343
20343
21342
22352
23352
24352
25352
26352
27351
28351
29351
30351

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the dry band about 98% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
19910
29910
39910
49910
59910
69910
79910
89910
99910
109910
119820
129820
139820
149820
159820
169730
179730
189730
199730
209730
219730
229730
239730
249631
259631
269631
279631
289631
299541
309541

Wind in April

Winds average 8 mph in April.

Across April, 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.

0246810151015202530
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
207light breeze
217light breeze
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 24 min at the start of April to 13 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 84 minutes over April. Sunrise moves from 5:37 AM to 4:50 AM, and sunset from 6:03 PM to 6:36 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:376:03
212.55:366:04
312.55:346:05
412.65:326:07
512.65:306:08
612.75:296:09
712.75:276:10
812.85:256:11
912.85:236:12
1012.95:226:13
1112.95:206:15
1213.05:186:16
1313.05:166:17
1413.15:156:18
1513.15:136:19
1613.15:116:20
1713.25:106:21
1813.25:086:23
1913.35:076:24
2013.35:056:25
2113.45:036:26
2213.45:026:27
2313.55:006:28
2413.54:596:29
2513.64:576:31
2613.64:566:32
2713.64:546:33
2813.74:536:34
2913.74:516:35
3013.84:506:36

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.87 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 — April's 4.87 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.5Bright
54.5Bright
64.6Bright
74.6Bright
84.7Bright
94.7Bright
104.7Bright
114.8Bright
124.8Bright
134.8Bright
144.9Bright
154.9Bright
164.9Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.1Bright
265.1Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
Planning a trip in April

Hazard calendar for Sudbury

In seasonPeak

None of Sudbury's seasonal hazards are active in April. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Sudbury 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 April a good time to visit Sudbury?

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

4.0
Sightseeing
7th-best month of the year
0.3
Beach & pool
7th-best month of the year

April is a reasonable time to visit Sudbury for sightseeing.

What to pack for Sudbury in April

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

In April, Sudbury sees daytime highs around 57°F and nights near 39°F. Worth packing: a warm layer, rain gear and sun protection. About 11 days see rain.

a warm layerrain gearsun protection

Sea temperature near Sudbury in April

The nearest coast averages about 42°F in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 27 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 Sudbury in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April 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 Sudbury 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 Sudbury in April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.

Air quality in Sudbury 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 Sudbury?

Sudbury sits at 42.4°N, 71.4°W, 184 ft above sea level, in United States. The nearest listed city is Framingham Center, 6.2 mi away.

Topography around Sudbury

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

Within 2 miles, the terrain around Sudbury has only modest variations in elevation — a maximum elevation change of 344 ft around an average of 194 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 600 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,176 ft.

The land around Sudbury is covered by trees (85%) within 2 miles, trees (82%) within 10 miles, and trees (76%) within 50 miles.

2 miles
344 ft
10 miles
600 ft
50 miles
3,176 ft
treesgrasslandcroplandartificial surfaceswaterwetland
April weather nearby: Framingham Center 6.2 mi · Concord 6.2 mi · Acton 6.8 mi · Framingham 7.5 mi · Marlborough 7.5 mi · Natick 7.5 mi · Wellesley 8.7 mi · Ashland 8.7 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 Sudbury (42.3834°, -71.4162°, elevation 184 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).