Twin Falls County climate

Twin Falls County Weather in September

NOAA 1991-2020 normals for Twin Falls Sun Vly Rgnl AP, 20.4 km from Twin Falls County

Average highs run from 82°F on September 1 to 70°F on September 30, and lows from 51°F to 42°F. Normal precipitation for the month is 0.53 in over about 4 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 Twin Falls County, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
76°F
Average low
47°F
Precipitation
0.53 in
Record high
102°FSep 6, 2022
Record low
24°FSep 28, 1999
Chance of a freeze
37%
Days of 90°F or more
2.9
Daylight
13 h 08 min to 11 h 47 min
Cloud cover
38%
Humidity
35%
Dew point
32°F
Wind
8.3 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
Sep 182°F51°F95°F 200438°F 200611%0%
Sep 282°F51°F96°F 200537°F 200611%0%
Sep 382°F51°F99°F 202239°F 200011%0%
Sep 481°F51°F95°F 201741°F 201112%0%
Sep 581°F50°F98°F 202039°F 199912%0%
Sep 681°F50°F102°F 202239°F 201612%0%
Sep 780°F50°F100°F 202235°F 201012%0%
Sep 880°F49°F94°F 202134°F 199912%0%
Sep 979°F49°F93°F 201230°F 202013%0%
Sep 1079°F49°F96°F 202136°F 200713%0%
Sep 1179°F49°F90°F 200140°F 202213%0%
Sep 1278°F48°F92°F 201540°F 201413%0%
Sep 1378°F48°F89°F 200032°F 200313%
Sep 1477°F48°F97°F 200037°F 200314%
Sep 1577°F47°F93°F 200235°F 202614%
Sep 1676°F47°F90°F 199837°F 200614%
Sep 1776°F47°F92°F 199830°F 201714%
Sep 1876°F46°F87°F 200931°F 200314%
Sep 1975°F46°F89°F 200935°F 200514%
Sep 2075°F46°F86°F 201335°F 201314%
Sep 2174°F46°F86°F 199932°F 202114%
Sep 2274°F45°F87°F 201136°F 200215%
Sep 2373°F45°F91°F 201133°F 200015%
Sep 2473°F45°F93°F 200130°F 200015%
Sep 2572°F44°F97°F 201527°F 200015%
Sep 2672°F44°F88°F 201031°F 200515%
Sep 2771°F44°F89°F 202228°F 199915%
Sep 2871°F43°F93°F 202424°F 199915%
Sep 2970°F43°F87°F 201527°F 199916%
Sep 3070°F42°F91°F 201025°F 201916%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Twin Falls 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 7:04 AM, sunset 8:12 PM
September 30
sunrise 7:35 AM, sunset 7:22 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00094178 (Twin Falls Sun Vly Rgnl AP), public domain. Records: NOAA GHCN-Daily, station USW00094178, 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.