Groton climate

Groton Weather in August

NOAA 1991-2020 normals for Nashua Cwsu, 15.7 km from Groton

Average highs run from 84°F on August 1 to 81°F on August 31, and lows from 61°F to 58°F. Normal precipitation for the month is 3.71 in.

August day by day

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

Normal daily high and low temperature at Groton, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
83°F
Average low
60°F
Precipitation
3.71 in
Record high
100°FAug 2, 2006
Record low
45°FAug 24, 2003
Chance of a freeze
0%
Days of 90°F or more
6.7
Daylight
14 h 28 min to 13 h 12 min
Cloud cover
56%
Humidity
73%
Dew point
60°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 184°F61°F96°F 200653°F 20210%
Aug 284°F61°F100°F 200649°F 20250%
Aug 384°F61°F95°F 201253°F 20210%
Aug 484°F61°F96°F 202255°F 19990%
Aug 584°F61°F94°F 202253°F 20130%
Aug 684°F61°F97°F 202250°F 20130%
Aug 784°F61°F96°F 202250°F 20040%
Aug 884°F61°F97°F 202253°F 20040%
Aug 984°F61°F97°F 200151°F 19990%
Aug 1083°F61°F94°F 202049°F 19990%
Aug 1183°F60°F95°F 201649°F 20070%
Aug 1283°F60°F96°F 201651°F 20060%
Aug 1383°F60°F97°F 200248°F 20060%
Aug 1483°F60°F98°F 200253°F 20060%
Aug 1583°F60°F94°F 200252°F 20070%
Aug 1683°F60°F94°F 200252°F 20260%
Aug 1783°F60°F93°F 200953°F 20000%
Aug 1883°F60°F94°F 200248°F 20000%
Aug 1983°F60°F92°F 200248°F 20070%
Aug 2082°F59°F92°F 202246°F 20070%
Aug 2182°F59°F92°F 200947°F 20070%
Aug 2282°F59°F91°F 201746°F 20070%
Aug 2382°F59°F94°F 202051°F 20230%
Aug 2482°F59°F94°F 202045°F 20030%
Aug 2582°F59°F94°F 200748°F 20190%
Aug 2682°F58°F94°F 202146°F 20190%
Aug 2781°F58°F92°F 202148°F 20190%
Aug 2881°F58°F92°F 201848°F 20250%
Aug 2981°F58°F94°F 201049°F 20030%
Aug 3081°F58°F93°F 201049°F 20240%
Aug 3181°F58°F97°F 201047°F 20020%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Groton, in percent, and of at least 0.1 inch of snowfall.00.21102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

August 1
sunrise 5:38 AM, sunset 8:06 PM
August 31
sunrise 6:10 AM, sunset 7:22 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00275703 (Nashua Cwsu), public domain. Records: NOAA GHCN-Daily, station USW00004780, 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.