Boston climate

Boston Weather in August

NOAA 1991-2020 normals for Colden 1W, 2.9 km from Boston

Average highs run from 77°F on August 1 to 74°F on August 31, and lows from 59°F to 56°F. Normal precipitation for the month is 4.04 in over about 13 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Boston, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
76°F
Average low
58°F
Precipitation
4.04 in
Record high
99°FAug 27, 1948
Record low
38°FAug 29, 1982
Chance of a freeze
0%
Daylight
14 h 28 min to 13 h 12 min
Cloud cover
59%
Humidity
73%
Dew point
58°F
Wind
4.5 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 177°F59°F95°F 194447°F 194744%0%
Aug 277°F59°F96°F 194449°F 194744%0%
Aug 377°F59°F95°F 201249°F 195644%0%
Aug 477°F59°F96°F 201251°F 197244%0%
Aug 577°F59°F93°F 194745°F 197244%0%
Aug 677°F59°F94°F 194748°F 199444%0%
Aug 777°F59°F93°F 194747°F 194844%0%
Aug 876°F59°F91°F 200149°F 198944%0%
Aug 976°F59°F92°F 201648°F 196444%0%
Aug 1076°F59°F94°F 194050°F 194844%0%
Aug 1176°F58°F92°F 198848°F 196244%0%
Aug 1276°F58°F93°F 198849°F 196744%0%
Aug 1376°F58°F93°F 194746°F 197944%0%
Aug 1476°F58°F92°F 195945°F 196444%0%
Aug 1576°F58°F92°F 195947°F 196244%0%
Aug 1676°F58°F90°F 198746°F 196344%0%
Aug 1776°F58°F93°F 195546°F 196144%0%
Aug 1876°F58°F90°F 194746°F 196343%0%
Aug 1976°F58°F90°F 199546°F 196343%0%
Aug 2075°F57°F90°F 195947°F 197743%0%
Aug 2175°F57°F87°F 195545°F 194043%0%
Aug 2275°F57°F88°F 200842°F 198243%0%
Aug 2375°F57°F90°F 194846°F 195243%0%
Aug 2475°F57°F91°F 194739°F 194043%0%
Aug 2575°F57°F91°F 201242°F 196343%0%
Aug 2675°F56°F93°F 194845°F 196342%0%
Aug 2775°F56°F99°F 194846°F 196942%0%
Aug 2875°F56°F92°F 194842°F 194142%0%
Aug 2974°F56°F90°F 195138°F 198242%0%
Aug 3074°F56°F91°F 195138°F 196542%0%
Aug 3174°F56°F93°F 196243°F 197642%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Boston, in percent, and of at least 0.1 inch of snowfall.010203040501102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

August 1
sunrise 6:07 AM, sunset 8:35 PM
August 31
sunrise 6:39 AM, sunset 7:51 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00301625 (Colden 1W), public domain. Records: NOAA GHCN-Daily, station USW00014733, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.