Libby climate

Libby Weather in September

NOAA 1991-2020 normals for Libby 1 Ne RS, 2.1 km from Libby

Average highs run from 84°F on September 1 to 70°F on September 30, and lows from 44°F to 38°F. Normal precipitation for the month is 1.09 in over about 7 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 Libby, in °F, with the record for each date.020406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
78°F
Average low
41°F
Precipitation
1.09 in
Record high
98°FSep 3, 2025
Record low
15°FSep 23, 2000
Chance of a freeze
73%
Days of 90°F or more
4.5
Daylight
13 h 23 min to 11 h 43 min
Cloud cover
54%
Humidity
60%
Dew point
37°F
Wind
4.0 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°F44°F94°F 195032°F 191321%0%
Sep 284°F44°F96°F 193828°F 199121%0%
Sep 384°F44°F98°F 202530°F 199121%0%
Sep 483°F44°F96°F 202533°F 195622%0%
Sep 583°F43°F96°F 198823°F 199122%0%
Sep 682°F43°F96°F 194432°F 196522%0%
Sep 782°F43°F96°F 194430°F 191122%0%
Sep 881°F43°F92°F 194429°F 196223%0%
Sep 981°F42°F97°F 190930°F 191023%0%
Sep 1081°F42°F95°F 194430°F 191323%0%
Sep 1180°F42°F95°F 194429°F 196423%0%
Sep 1280°F42°F94°F 194423°F 197023%0%
Sep 1379°F42°F97°F 201326°F 199323%0%
Sep 1479°F41°F92°F 201325°F 197024%0%
Sep 1578°F41°F90°F 200124°F 197024%0%
Sep 1678°F41°F90°F 201326°F 197324%0%
Sep 1777°F41°F89°F 198127°F 197124%0%
Sep 1877°F40°F92°F 198126°F 194525%0%
Sep 1976°F40°F88°F 202525°F 194325%0%
Sep 2076°F40°F86°F 196725°F 198325%0%
Sep 2175°F40°F89°F 196728°F 197125%0%
Sep 2275°F40°F87°F 195026°F 200025%0%
Sep 2374°F39°F85°F 198715°F 200025%0%
Sep 2473°F39°F86°F 201122°F 198425%0%
Sep 2573°F39°F86°F 202424°F 191026%0%
Sep 2672°F39°F89°F 195229°F 190826%0%
Sep 2772°F38°F85°F 196725°F 196126%0%
Sep 2871°F38°F87°F 190921°F 198426%0%
Sep 2970°F38°F83°F 196321°F 198526%0%
Sep 3070°F38°F80°F 197624°F 198527%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Libby, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

September 1
sunrise 7:00 AM, sunset 8:23 PM
September 30
sunrise 7:40 AM, sunset 7:23 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00245015 (Libby 1 Ne RS), public domain. Records: NOAA GHCN-Daily, station USC00101079, 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.