Boston weather in July: Boston, Massachusetts: normal highs, lows, rain and records for July
Boston in July has a normal high of 82°F and a normal low of 66°F, a daily mean of 74°F, holding near 82°F all month. Measurable precipitation falls on 9 days in a normal July, 3.27 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 28°C and low of 19°C, 83 mm of precipitation in July.
- NOAA stationBoston Logan International Airport
- Station IDUSW00014739
- Location42.36°N 71.01°W
- Elevation12 ft (4 m)
- From the center2 miles
- Population673,458
- Jan 37° 23°
- Feb 39° 25°
- Mar 46° 31°
- Apr 56° 41°
- May 67° 50°
- Jun 76° 60°
- Jul 82° 66°
- Aug 80° 65°
- Sep 73° 58°
- Oct 62° 48°
- Nov 52° 38°
- Dec 42° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Boston in July?
The normal high is 82°F and the normal low 66°F, for a daily mean of 74.1°F. July is 6.1°F warmer than June and 1.4°F warmer than August. July is the warmest month of the year in Boston and the 9th wettest. Across the month the normal high rises 1°F, from 81°F on July 1 to 82°F on July 31. From one year to the next July's mean temperature typically moves about 2.3°F either way (NOAA's standard deviation), so roughly two Julys in three average between 72°F and 76°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| July 1 | 81°F | 64°F | 33% | 20% |
| July 8 | 82°F | 66°F | 32% | 19% |
| July 15 | 82°F | 66°F | 31% | 19% |
| July 22 | 83°F | 67°F | 31% | 20% |
| July 31 | 82°F | 66°F | 31% | 19% |
Every day of July: normal high, low and chance of precipitation (warmest afternoon July 16, coldest night July 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| July 1 | 81°F | 64°F | 33% | 20% | 15 h 10 min |
| July 2 | 81°F | 65°F | 33% | 19% | 15 h 10 min |
| July 3 | 81°F | 65°F | 32% | 19% | 15 h 10 min |
| July 4 | 81°F | 65°F | 32% | 19% | 15 h 10 min |
| July 5 | 82°F | 65°F | 32% | 19% | 15 h 10 min |
| July 6 | 82°F | 65°F | 32% | 19% | 15 h 10 min |
| July 7 | 82°F | 65°F | 32% | 19% | 15 h 10 min |
| July 8 | 82°F | 66°F | 32% | 19% | 15 h 10 min |
| July 9 | 82°F | 66°F | 32% | 19% | 15 h 10 min |
| July 10 | 82°F | 66°F | 32% | 19% | 15 h 10 min |
| July 11 | 82°F | 66°F | 32% | 19% | 15 h 10 min |
| July 12 | 82°F | 66°F | 32% | 19% | 15 h |
| July 13 | 82°F | 66°F | 31% | 19% | 15 h |
| July 14 | 82°F | 66°F | 31% | 19% | 15 h |
| July 15 | 82°F | 66°F | 31% | 19% | 15 h |
| July 16 | 83°F | 66°F | 31% | 19% | 15 h |
| July 17 | 83°F | 66°F | 31% | 19% | 15 h |
| July 18 | 83°F | 67°F | 31% | 19% | 15 h |
| July 19 | 83°F | 67°F | 31% | 19% | 14 h 50 min |
| July 20 | 83°F | 67°F | 31% | 19% | 14 h 50 min |
| July 21 | 83°F | 67°F | 31% | 20% | 14 h 50 min |
| July 22 | 83°F | 67°F | 31% | 20% | 14 h 50 min |
| July 23 | 82°F | 67°F | 31% | 20% | 14 h 50 min |
| July 24 | 82°F | 67°F | 31% | 20% | 14 h 50 min |
| July 25 | 82°F | 67°F | 31% | 20% | 14 h 40 min |
| July 26 | 82°F | 67°F | 31% | 20% | 14 h 40 min |
| July 27 | 82°F | 67°F | 31% | 20% | 14 h 40 min |
| July 28 | 82°F | 67°F | 31% | 20% | 14 h 40 min |
| July 29 | 82°F | 67°F | 31% | 20% | 14 h 40 min |
| July 30 | 82°F | 67°F | 31% | 19% | 14 h 30 min |
| July 31 | 82°F | 66°F | 31% | 19% | 14 h 30 min |
- Normal high
- 82°FJuly average
- Normal low
- 66°FJuly average
- Precipitation
- 3.27 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 6
- Daylight
- 15 h 10 min to 14 h 30 minJuly 1 to July 31
- Days at 70°F or more
- 29
- Days at 80°F or more
- 20
- Sunshine
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014739; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Boston in July?
On a given July day the chance of 0.01 inch or more is 31% on average, highest around July 1 (33%). In all, 3.27 in falls on 9 days of a normal July, 1 of them with an inch or more.
In a normal July in Boston, 6 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014739.
How humid and windy is Boston in July?
At 3 p.m. the normal temperature is 79°F with 57% relative humidity and a dew point of 62°F; at 6 a.m. it is 70°F with 78% humidity. The wind averages 9.6 mph, most often from the south-southeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 70°F | 63°F | 78% | 7.7 mph | 35% |
| 9 a.m. | 75°F | 62°F | 64% | 9.1 mph | 35% |
| noon | 79°F | 62°F | 57% | 11.6 mph | 26% |
| 3 p.m. | 79°F | 62°F | 57% | 12.6 mph | – |
| 6 p.m. | 76°F | 62°F | 63% | 11.1 mph | – |
| 9 p.m. | 73°F | 63°F | 71% | 8.7 mph | 38% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014739. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for July in Boston?
The warmest July temperature on Boston's official record (since 1872) is 104°F, on July 4, 1911; the coldest is 50°F, on July 6, 1879. The wettest July brought 11.69 in (1921).
The July mean against the 1991-2020 normal of 74.1°F: 2021 72.3°F (−1.8), 2022 77.5°F (+3.4), 2023 75.4°F (+1.3), 2024 76.0°F (+1.9), 2025 76.0°F (+1.9), 2026 74.7°F (+0.6). 5 of 6 ran warmer than normal.
| July | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 72.3°F | −1.8°F | 10.07 in |
| 2022 | 77.5°F | +3.4°F | 0.62 in |
| 2023 | 75.4°F | +1.3°F | 10.43 in |
| 2024 | 76.0°F | +1.9°F | 1.39 in |
| 2025 | 76.0°F | +1.9°F | 3.01 in |
| 2026 | 74.7°F | +0.6°F | 4.63 in |
Source: records: ACIS, NWS threaded record BOSthr; recent months: ACIS, station USW00014739. Records and recent months use complete months only.
How does July in Boston compare across Massachusetts?
Across the 35 places PlainClimate covers in Massachusetts, July normal highs run from 75°F in Nantucket to 87°F in Maynard; Boston's is 82°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.