Cheyenne County climate

Cheyenne County Weather in September

NOAA 1991-2020 normals for Sidney 6 Nnw, 2.4 km from Cheyenne County

Average highs run from 83°F on September 1 to 71°F on September 30, and lows from 53°F to 42°F. Normal precipitation for the month is 1.65 in over about 5 wet days.

September day by day

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

Normal daily high and low temperature at Cheyenne County, in °F, with the record for each date.020406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
78°F
Average low
48°F
Precipitation
1.65 in
Snowfall
0.1 in
Record high
102°FSep 6, 2022
Record low
13°FSep 30, 1985
Chance of a freeze
34%
Days of 90°F or more
4.3
Daylight
13 h 05 min to 11 h 47 min
Cloud cover
45%
Humidity
50%
Dew point
42°F
Wind
9.6 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 183°F53°F98°F 197534°F 196517%0%
Sep 283°F53°F99°F 198332°F 200617%0%
Sep 383°F53°F100°F 201733°F 197417%0%
Sep 483°F53°F100°F 199833°F 197417%0%
Sep 582°F52°F100°F 201033°F 196117%0%
Sep 682°F52°F102°F 202234°F 201717%0%
Sep 782°F52°F102°F 202235°F 201017%0%
Sep 881°F51°F102°F 202232°F 202017%0%
Sep 981°F51°F98°F 202428°F 196217%0%
Sep 1081°F51°F102°F 202128°F 202017%0%
Sep 1180°F50°F100°F 202133°F 201417%0%
Sep 1280°F50°F96°F 200432°F 194917%0%
Sep 1380°F49°F95°F 201726°F 194917%0%
Sep 1479°F49°F96°F 201534°F 197417%0%
Sep 1579°F49°F96°F 201832°F 196117%0%
Sep 1678°F48°F97°F 201829°F 196517%0%
Sep 1778°F48°F99°F 200028°F 196517%0%
Sep 1877°F48°F93°F 194830°F 194917%0%
Sep 1977°F47°F94°F 202228°F 197117%0%
Sep 2076°F47°F98°F 201024°F 198317%0%
Sep 2176°F46°F94°F 200515°F 198317%0%
Sep 2275°F46°F93°F 195326°F 200217%0%
Sep 2375°F45°F94°F 200728°F 198517%0%
Sep 2474°F45°F91°F 202027°F 196516%0%
Sep 2574°F44°F91°F 199824°F 198416%0%
Sep 2673°F44°F96°F 202423°F 197216%0%
Sep 2773°F44°F94°F 195321°F 196416%0%
Sep 2872°F43°F92°F 196922°F 198516%1%
Sep 2972°F43°F92°F 202416°F 198416%1%
Sep 3071°F42°F88°F 196713°F 198516%1%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Cheyenne County, in percent, and of at least 0.1 inch of snowfall.051015201102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

September 1
sunrise 6:19 AM, sunset 7:24 PM
September 30
sunrise 6:48 AM, sunset 6:35 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00257830 (Sidney 6 Nnw), public domain. Records: NOAA GHCN-Daily, station USW00024030, 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.