Stonington climate

Stonington Weather in August

NOAA 1991-2020 normals for Groton, 11.1 km from Stonington

Average highs run from 81°F on August 1 to 78°F on August 31, and lows from 66°F to 63°F. Normal precipitation for the month is 4.19 in over about 9 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 Stonington, in °F, with the record for each date.405060708090100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
80°F
Average low
65°F
Precipitation
4.19 in
Record high
93°FAug 30, 2018
Record low
47°FAug 28, 2025
Chance of a freeze
0%
Days of 90°F or more
0.7
Daylight
14 h 21 min to 13 h 09 min
Cloud cover
53%
Humidity
75%
Dew point
62°F
Wind
4.7 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 181°F66°F91°F 200651°F 202132%0%
Aug 281°F66°F89°F 200752°F 202532%0%
Aug 381°F66°F89°F 200552°F 202532%0%
Aug 481°F66°F87°F 200254°F 202532%0%
Aug 581°F66°F90°F 201855°F 201332%0%
Aug 681°F66°F92°F 201851°F 201332%0%
Aug 781°F66°F89°F 202651°F 200432%0%
Aug 881°F66°F90°F 200151°F 202532%0%
Aug 981°F66°F91°F 200150°F 202532%0%
Aug 1081°F66°F89°F 201850°F 199932%0%
Aug 1180°F66°F90°F 200953°F 200732%0%
Aug 1280°F66°F87°F 201652°F 200631%0%
Aug 1380°F66°F90°F 201649°F 200631%0%
Aug 1480°F66°F91°F 201651°F 200631%0%
Aug 1580°F66°F89°F 201653°F 201331%0%
Aug 1680°F65°F89°F 201852°F 201431%0%
Aug 1780°F65°F92°F 200254°F 200031%0%
Aug 1880°F65°F88°F 200950°F 200031%0%
Aug 1980°F65°F90°F 200249°F 202530%0%
Aug 2080°F65°F88°F 201951°F 200030%0%
Aug 2180°F65°F86°F 200549°F 200030%0%
Aug 2279°F65°F88°F 200550°F 200030%0%
Aug 2379°F64°F85°F 200951°F 200430%0%
Aug 2479°F64°F86°F 200952°F 202330%0%
Aug 2579°F64°F89°F 202249°F 201330%0%
Aug 2679°F64°F86°F 202148°F 200430%0%
Aug 2779°F64°F87°F 201651°F 201730%0%
Aug 2879°F64°F90°F 201847°F 202530%0%
Aug 2978°F63°F92°F 201851°F 200330%0%
Aug 3078°F63°F93°F 201850°F 201430%0%
Aug 3178°F63°F91°F 201049°F 202030%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Stonington, 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 5:43 AM, sunset 8:04 PM
August 31
sunrise 6:13 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 USC00063207 (Groton), public domain. Records: NOAA GHCN-Daily, station USW00014794, 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.