Dedham climate

Dedham Weather in August

NOAA 1991-2020 normals for Blue Hill Coop, 5.4 km from Dedham

Average highs run from 82°F on August 1 to 78°F on August 31, and lows from 64°F to 60°F. Normal precipitation for the month is 3.91 in over about 10 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 Dedham, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
80°F
Average low
63°F
Precipitation
3.91 in
Record high
99°FAug 9, 2022
Record low
39°FAug 19, 2007
Chance of a freeze
0%
Days of 90°F or more
2.6
Daylight
14 h 26 min to 13 h 11 min
Cloud cover
51%
Humidity
73%
Dew point
61°F
Wind
4.3 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 182°F64°F94°F 202449°F 201035%0%
Aug 282°F64°F97°F 200647°F 202535%0%
Aug 382°F64°F95°F 200649°F 202535%0%
Aug 482°F64°F98°F 202250°F 201635%0%
Aug 582°F64°F98°F 202248°F 201334%0%
Aug 681°F64°F98°F 202244°F 201334%0%
Aug 781°F64°F98°F 202244°F 200434%0%
Aug 881°F64°F98°F 202247°F 200234%0%
Aug 981°F64°F99°F 202245°F 199934%0%
Aug 1081°F63°F95°F 202043°F 199934%0%
Aug 1181°F63°F95°F 201641°F 200734%0%
Aug 1281°F63°F96°F 201643°F 200634%0%
Aug 1381°F63°F96°F 200543°F 200634%0%
Aug 1481°F63°F99°F 200244°F 201034%0%
Aug 1581°F63°F92°F 200247°F 201333%0%
Aug 1680°F63°F93°F 200246°F 202633%0%
Aug 1780°F63°F94°F 200248°F 200033%0%
Aug 1880°F63°F95°F 201943°F 200033%0%
Aug 1980°F63°F96°F 201939°F 200732%0%
Aug 2080°F62°F94°F 202243°F 200732%0%
Aug 2180°F62°F90°F 202042°F 200032%0%
Aug 2280°F62°F91°F 201742°F 200732%0%
Aug 2379°F62°F91°F 202044°F 201631%0%
Aug 2479°F62°F91°F 199843°F 200231%0%
Aug 2579°F62°F94°F 200745°F 200431%0%
Aug 2679°F61°F95°F 202141°F 200431%0%
Aug 2779°F61°F93°F 202143°F 200831%0%
Aug 2879°F61°F97°F 201842°F 201730%0%
Aug 2978°F61°F97°F 201844°F 201730%0%
Aug 3078°F61°F92°F 201044°F 201430%0%
Aug 3178°F60°F95°F 201041°F 200230%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Dedham, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

August 1
sunrise 5:38 AM, sunset 8:04 PM
August 31
sunrise 6:09 AM, sunset 7:20 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00190736 (Blue Hill Coop), public domain. Records: NOAA GHCN-Daily, station USW00054704, 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.