Bison climate

Bison Weather in September

NOAA 1991-2020 normals for Bison, 1 km from Bison

Average highs run from 82°F on September 1 to 70°F on September 30, and lows from 53°F to 42°F. Normal precipitation for the month is 1.38 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 Bison, in °F, with the record for each date.020406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
76°F
Average low
48°F
Precipitation
1.38 in
Record high
104°FSep 2, 2024
Record low
20°FSep 24, 2000
Chance of a freeze
47%
Days of 90°F or more
3.1
Daylight
13 h 16 min to 11 h 45 min
Cloud cover
51%
Humidity
55%
Dew point
43°F
Wind
11.2 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°F53°F101°F 200437°F 201814%0%
Sep 282°F52°F104°F 202433°F 200814%0%
Sep 381°F52°F100°F 200728°F 200814%0%
Sep 481°F52°F101°F 199832°F 201114%0%
Sep 581°F51°F104°F 200130°F 202514%0%
Sep 680°F51°F96°F 201326°F 202514%0%
Sep 780°F51°F100°F 202227°F 200414%
Sep 880°F50°F92°F 202429°F 202014%
Sep 979°F50°F99°F 199827°F 202014%
Sep 1079°F50°F96°F 199829°F 202014%
Sep 1179°F49°F91°F 202431°F 201414%
Sep 1278°F49°F98°F 201725°F 201414%
Sep 1378°F49°F93°F 201527°F 201214%
Sep 1477°F48°F88°F 200921°F 200714%
Sep 1577°F48°F93°F 200226°F 199914%
Sep 1677°F48°F98°F 200233°F 201414%
Sep 1776°F47°F94°F 200030°F 201214%
Sep 1876°F47°F97°F 202130°F 201014%
Sep 1975°F46°F91°F 202227°F 200614%
Sep 2075°F46°F87°F 200521°F 199714%
Sep 2174°F46°F85°F 201530°F 200214%
Sep 2274°F45°F93°F 200725°F 201214%
Sep 2373°F45°F90°F 201124°F 200014%
Sep 2473°F44°F89°F 201120°F 200014%
Sep 2572°F44°F90°F 201426°F 200014%
Sep 2672°F44°F99°F 202425°F 200214%
Sep 2771°F43°F96°F 202128°F 199914%
Sep 2871°F43°F99°F 202124°F 199914%
Sep 2970°F42°F100°F 202426°F 200314%
Sep 3070°F42°F85°F 199721°F 200314%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Bison, in percent, and of at least 0.1 inch of snowfall.0510151102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

September 1
sunrise 6:11 AM, sunset 7:27 PM
September 30
sunrise 6:47 AM, sunset 6:32 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00390701 (Bison), public domain. Records: NOAA GHCN-Daily, station USW00094038, 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.