Guernsey climate

Guernsey Weather in September

NOAA 1991-2020 normals for Guernsey 2NW, 2.5 km from Guernsey

Average highs run from 84°F on September 1 to 71°F on September 30, and lows from 53°F to 42°F. Normal precipitation for the month is 1.20 in.

September day by day

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

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

September at a glance

Average high
78°F
Average low
48°F
Precipitation
1.20 in
Record high
97°FSep 4, 2013
Record low
31°FSep 13, 2014
Chance of a freeze
28%
Days of 90°F or more
6.2
Daylight
13 h 09 min to 11 h 47 min
Cloud cover
47%
Humidity
48%
Dew point
38°F
Wind
10.1 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
Sep 184°F53°F95°F 201250°F 20140%
Sep 284°F53°F94°F 201544°F 20140%
Sep 383°F52°F95°F 201455°F 20140%
Sep 483°F52°F97°F 201352°F 20170%
Sep 583°F52°F94°F 201348°F 20170%
Sep 682°F51°F94°F 201342°F 20170%
Sep 782°F51°F93°F 201348°F 20140%
Sep 881°F51°F93°F 201346°F 20120%
Sep 981°F50°F92°F 201243°F 20120%
Sep 1081°F50°F96°F 201239°F 20160%
Sep 1180°F49°F91°F 201733°F 20140%
Sep 1280°F49°F92°F 201733°F 20140%
Sep 1379°F49°F91°F 201531°F 20140%
Sep 1479°F48°F91°F 201538°F 20140%
Sep 1579°F48°F88°F 201239°F 20140%
Sep 1678°F48°F88°F 201441°F 20160%
Sep 1778°F47°F89°F 201337°F 20170%
Sep 1877°F47°F93°F 201443°F 20120%
Sep 1977°F46°F89°F 201642°F 20151%
Sep 2076°F46°F92°F 201639°F 20131%
Sep 2176°F46°F88°F 201343°F 20131%
Sep 2275°F45°F82°F 201342°F 20121%
Sep 2375°F45°F81°F 201242°F 20171%
Sep 2474°F44°F87°F 201440°F 20131%
Sep 2574°F44°F93°F 201440°F 20161%
Sep 2673°F44°F93°F 201438°F 20171%
Sep 2773°F43°F90°F 201537°F 20131%
Sep 2872°F43°F81°F 201633°F 20131%
Sep 2971°F42°F83°F 201646°F 20121%
Sep 3071°F42°F81°F 201546°F 20171%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Guernsey, in percent, and of at least 0.1 inch of snowfall.00.30.50.811.31102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

September 1
sunrise 6:24 AM, sunset 7:33 PM
September 30
sunrise 6:55 AM, sunset 6:42 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00484131 (Guernsey 2NW), public domain. Records: NOAA GHCN-Daily, station USC00484131, 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.