Boston weather in July

In July, Boston sees average daytime highs of 21°C and overnight lows near 13°C, with 62 mm of rain across 11.1 wet days and about 16.2 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 20°C in the first days to 21°C by the end. The sky is clear or mostly clear about 13% of the time in July, and the air most often feels dry.

Daylight stretches from about 16 h 36 min at the start of July to 15 h 30 min by month's end. Set against the rest of the year, July is Boston's 3rd-clearest and 12th-windiest month. For the whole year in context, see Boston's year-round climate.

Daytime high
21°
1st warmest
Overnight low
13°
12th coldest
Rainfall
62 mm
11.1 wet days
Daylight
16 h 12 min
3:59 AM – 8:12 PM
Cloud cover
69%
3rd clearest
Wind
15 km/h
12th windiest
Solar energy
4.89 kWh/m²
Travel score
6.1
out of 10

Boston is town and port in Lincolnshire, England, UK.

Density
2,461/km²
people per km²

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

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 20°C in the first days to 21°C by the end.

A typical July day in Boston reaches about 21°C in the afternoon and slips back to 13°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 25°C. Set against its neighbours, July runs about 2°C warmer than June and on par with August.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12013
22013
32013
42013
52013
62013
72013
82013
92013
102013
112013
122113
132113
142113
152113
162113
172114
182114
192114
202114
212114
222114
232114
242114
252114
262114
272114
282114
292114
302114
312114

How July really feels in Boston

Once humidity and wind are folded in, July averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Boston weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 4911.30.87.90.9
Feb / 389.11.19.51.1
Mar10° / 4210.10.611.52.1
Apr12° / 4610.50.113.63.3
May15° / 5010015.54.6
Jun18° / 11°6111.1016.65.5
Jul21° / 13°6211.1016.26.1
Aug21° / 13°6310.9014.56.1
Sep18° / 11°559.5012.45.6
Oct14° / 6010.6010.33.9
Nov10° / 5511.10.28.42.1
Dec / 51110.97.41.0

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 20% of July, with mostly cloudy or overcast conditions the remaining 67%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13070
23070
32971
43070
53070
63070
73070
82971
93070
103070
113070
123268
133268
143268
153367
163367
173367
183565
193565
203565
213565
223565
233664
243664
253565
263565
273664
283664
293664
303565
313565

Chance of precipitation in July

Any precipitation

Boston gets around 62 mm of rain over 11.1 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 35% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
137
237
337
437
537
636
736
836
936
1036
1136
1235
1335
1435
1534
1634
1734
1834
1934
2034
2134
2234
2335
2435
2535
2635
2735
2835
2935
3036
3136

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the dry band about 54% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1672760
2662860
3652960
4643060
5633160
6623260
7613360
8613450
9603550
10593650
11573760
12573760
13563860
14563860
15553870
16553870
17543880
18533890
195138101
205038111
214939111
224939121
234839131
244739131
254739141
264639141
274539151
284539151
294539151
304440151
314440161

Wind in July

Winds average 15 km/h in July, the calmest month.

Across July, daily wind ranges from about 15 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze
3115light breeze

Sunrise & sunset in July

DaylightNight

Daylight runs from about 16 h 36 min at the start of July to 15 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over July. Sunrise moves from 3:45 AM to 4:21 AM, and sunset from 8:22 PM to 7:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
116.63:458:22
216.63:468:22
316.63:468:21
416.63:478:21
516.53:488:20
616.53:498:20
716.53:508:19
816.53:518:19
916.43:528:18
1016.43:538:17
1116.43:548:17
1216.43:558:16
1316.33:568:15
1416.33:578:14
1516.23:588:13
1616.23:598:12
1716.24:018:11
1816.14:028:10
1916.14:038:09
2016.04:058:07
2116.04:068:06
2216.04:078:05
2315.94:098:04
2415.94:108:02
2515.84:128:01
2615.84:137:59
2715.74:157:58
2815.74:167:56
2915.64:187:55
3015.64:197:53
3115.54:217:51

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 4.89 kWh/m².

For context, solar energy here swings from a low near 0.57 kWh/m² to a high of 5.02 kWh/m² in June across the year — July's 4.89 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.6Bright
314.6Bright
Planning a trip in July

Is July a good time to visit Boston?

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

6.1
Sightseeing
1st-best month of the year
3.6
Beach & pool
1st-best month of the year

July is a reasonable time to visit Boston for sightseeing.

What to pack for Boston in July

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

In July, Boston sees daytime highs around 21°C and nights near 13°C. Worth packing: rain gear and sun protection. About 11 days see rain.

rain gearsun protection

Sea temperature near Boston in July

The nearest coast averages about 17°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 29 km away) is warmest in August at about 18°C and coldest in February near 5°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan6Bracing
Feb5Bracing
Mar6Bracing
Apr8Bracing
May11Bracing
Jun14Bracing
Jul17Cool
Aug18Cool
Sep16Cool
Oct13Bracing
Nov10Bracing
Dec7Bracing

UV index in Boston in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July 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 Boston peaks around August 11 at about 6 (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 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowAug 11UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May6High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Low
Nov1Low
Dec1Low
Location & terrain

Where is Boston?

Boston sits at 53.0°N, 0.0°W, 9 m above sea level, in United Kingdom. The nearest listed city is Spalding, 23 km away.

Topography around Boston

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Boston.

Within 3 km, the terrain around Boston has only modest variations in elevation — a maximum elevation change of 21 m around an average of 2 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 23 m; within 80 km, only modest variations in elevation — a maximum elevation change of 249 m.

The land around Boston is covered by cropland (38%), artificial surfaces (26%) and grassland (23%) within 3 km, cropland (68%) within 16 km, and cropland (54%) within 80 km.

3 km
21 m
16 km
23 m
80 km
249 m
treesgrasslandcroplandartificial surfaceswaterwetland
July weather nearby: Spalding 23 km · Sleaford 26 km · Skegness 31 km · Wisbech 37 km · King's Lynn 38 km · Grantham 42 km · Louth 43 km · Lincoln 44 km

United Kingdom travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type D / G / M
230 V · 50 Hz
Prices
≈ 89% of US
price level, 2025
GDP per capita
$57,602
2025
Happiness
6.7 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2021
Road deaths
3.2
per 100k/yr, 2019
Income group
High
World Bank
Religion
Christian 60%none 26%Muslim 4%other 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 Boston (52.9763°, -0.0266°, elevation 9 m), 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. 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).