Butte County climate

Butte County Weather in September

NOAA 1991-2020 normals for Arco, 14.1 km from Butte County

Average highs run from 80°F on September 1 to 69°F on September 30, and lows from 45°F to 36°F. Normal precipitation for the month is 0.66 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 Butte County, in °F, with the record for each date.020406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
75°F
Average low
41°F
Precipitation
0.66 in
Record high
100°FSep 3, 2022
Record low
18°FSep 20, 1983
Chance of a freeze
72%
Days of 90°F or more
0.5
Daylight
13 h 12 min to 11 h 46 min
Cloud cover
43%
Humidity
39%
Dew point
31°F
Wind
7.4 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 180°F45°F96°F 202232°F 196511%0%
Sep 280°F45°F96°F 195033°F 197511%0%
Sep 380°F45°F100°F 202230°F 196411%0%
Sep 479°F44°F97°F 202231°F 196511%0%
Sep 579°F44°F97°F 202033°F 196511%0%
Sep 679°F44°F99°F 202231°F 201011%0%
Sep 778°F44°F99°F 202230°F 199211%0%
Sep 878°F43°F92°F 202129°F 200112%0%
Sep 978°F43°F95°F 202126°F 196212%0%
Sep 1077°F43°F95°F 195929°F 202012%0%
Sep 1177°F42°F93°F 199032°F 196412%0%
Sep 1277°F42°F91°F 199024°F 201412%0%
Sep 1376°F42°F91°F 194829°F 198912%0%
Sep 1476°F42°F94°F 199028°F 199312%0%
Sep 1575°F41°F91°F 200026°F 197012%0%
Sep 1675°F41°F89°F 200029°F 196512%0%
Sep 1775°F41°F90°F 201424°F 196512%0%
Sep 1874°F40°F90°F 195621°F 196512%0%
Sep 1974°F40°F90°F 195622°F 196512%0%
Sep 2073°F40°F86°F 202218°F 198312%0%
Sep 2173°F39°F86°F 196622°F 198312%0%
Sep 2273°F39°F87°F 196625°F 197112%0%
Sep 2372°F39°F88°F 198723°F 198512%0%
Sep 2472°F39°F88°F 198718°F 200012%0%
Sep 2571°F38°F89°F 200121°F 197012%0%
Sep 2671°F38°F87°F 196326°F 197012%0%
Sep 2770°F38°F86°F 196924°F 196412%0%
Sep 2870°F37°F89°F 202418°F 199912%0%
Sep 2969°F37°F89°F 195718°F 198512%0%
Sep 3069°F36°F90°F 195718°F 198512%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Butte County, in percent, and of at least 0.1 inch of snowfall.02.557.51012.51102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

September 1
sunrise 6:56 AM, sunset 8:08 PM
September 30
sunrise 7:29 AM, sunset 7:15 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00100375 (Arco), public domain. Records: NOAA GHCN-Daily, station USW00024145, 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.