Boston, MA weather in July
July in Boston: warm and often humid, with some rain. Highs 82°F, lows 66°F, about 9 days with rain. This is the peak of the warm season in Boston.
- Normal high
- 82°F
- Normal low
- 66°F
- Wet days
- 9
- 3.3 in total
- Muggy days
- 10
- dew point 65°F+
How July changes from start to finish
| July 1 | July 31 | |
|---|---|---|
| Normal high | 81°F | 82°F |
| Normal low | 64°F | 66°F |
| Chance of a wet day | 32% | 31% |
| Sunrise / sunset | 5:11 am / 8:24 pm | 5:35 am / 8:05 pm |
| Daylight | 15.2 h | 14.5 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical July day
- 6 am70°Fdew point 62°F
- 9 am76°Fdew point 62°F
- Noon79°Fdew point 62°F
- 3 pm79°Fdew point 61°F
- 6 pm76°Fdew point 62°F
- 9 pm73°Fdew point 62°F
NOAA hourly normals (local standard time) from Boston Logan Intl Airport (3 mi away); average wind 10 mph; clear or few clouds in 24% of daytime hours, mostly cloudy or overcast in 49%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F6 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph12 of 31
- Hot dayshigh 90°F or more6 of 31
- Muggy daysdaily mean dew point 65°F or more10 of 31
- Wet daysat least 0.01 in of rain or melted snow9 of 31
- Notable rainat least 0.10 in6 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per July, counted from daily records for each year 1991-2020.
Rain in July
Normal precipitation is 3.3 in; a dry July brings about 2.0 in and a wet one about 4.4 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How July varies from year to year
- Warmest July, 1991-20202019: average high 87°F
- Coolest July2000: average high 77°F
- Wettest July2009: 6.9 in
- Driest July1997: 0.6 in
- Highest reading103°F (July 22, 2011)
- Lowest reading54°F (July 23, 1992)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
July compared with June and August
| June | July | August | |
|---|---|---|---|
| Normal high | 76°F | 82°F | 80°F |
| Normal low | 60°F | 66°F | 65°F |
| Wet days | 11 | 9 | 9 |
| Comfortable days | 12 | 6 | 8 |
| Daylight | 15.2 h | 14.9 h | 13.8 h |
Highs change by +6°F from June and -2°F into August.
Nearby alternatives in July
- Cooler: Kennebunkport, ME75 mi · high 77°F · 11 wet days
How Boston ranks in July
- Normal high297th warmest of 378 cities; 6th of 9 in Massachusetts
- Wet days194th driest of 378
- Comfortable days96th most of 340
What to pack for Boston in July
- A rain jacket or umbrella – rain on about 9 days
- A swimsuit – about 12 beach days
- Sunglasses and sunscreen – about 14.9 hours of daylight and highs near 82°F
Heating and cooling
July has 4 heating degree days and 284 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How hot is Boston in July?
The normal high is 82°F and the normal low is 66°F. From 1991 to 2020 the hottest July reading was 103°F (July 22, 2011).
Does it rain a lot in Boston in July?
About 9 days in July have at least 0.01 in of precipitation, and the normal total is 3.3 in. The wettest July in 1991-2020 was in 2009 (6.9 in); the driest was in 1997 (0.6 in).
Is July a good time to visit Boston?
July ranks 5th of 12 months on our comfort score for Boston (59 out of 100). It has about 6 comfortable days and about 6 days at 90°F or hotter. The best months are May, June and September.
Where the numbers come from
- Temperature, rain, snowfall, frost dates, humidity and wind by hour and cloud cover: Boston Logan Intl Airport (USW00014739), 2.5 mi E of the city center, 12 ft . NOAA normals and daily records, 1991-2020.
- Snow depth: Hingham (USC00193624), 12 mi SE of the city center, 35 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Gen E L Logan International Airport (725090-14739), 2.5 mi E of the city center, 11 ft . Hourly observations, 1991-2020.