Bismarck climate

Bismarck Weather in September

NOAA 1991-2020 normals for Bismarck, 4.5 km from Bismarck

Average highs run from 79°F on September 1 to 67°F on September 30, and lows from 51°F to 40°F. Normal precipitation for the month is 1.72 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 Bismarck, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
73°F
Average low
46°F
Precipitation
1.72 in
Record high
101°FSep 2, 2022
Record low
25°FSep 24, 2012
Chance of a freeze
65%
Days of 90°F or more
1.9
Daylight
13 h 19 min to 11 h 44 min
Cloud cover
54%
Humidity
59%
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 179°F51°F91°F 202242°F 202025%0%
Sep 279°F51°F101°F 202244°F 202425%0%
Sep 379°F51°F98°F 202347°F 202025%0%
Sep 478°F50°F99°F 201541°F 202525%0%
Sep 578°F50°F95°F 202641°F 202525%0%
Sep 678°F50°F94°F 202241°F 201425%0%
Sep 777°F49°F94°F 202137°F 202525%0%
Sep 877°F49°F96°F 202234°F 202525%0%
Sep 976°F49°F88°F 201433°F 202025%0%
Sep 1076°F48°F89°F 202427°F 202025%0%
Sep 1176°F48°F96°F 201234°F 202025%0%
Sep 1275°F47°F90°F 201634°F 201525%
Sep 1375°F47°F96°F 201736°F 201225%
Sep 1474°F47°F95°F 201536°F 201224%
Sep 1574°F46°F86°F 202235°F 201424%
Sep 1674°F46°F92°F 201233°F 201424%
Sep 1773°F45°F90°F 202441°F 201424%
Sep 1873°F45°F90°F 202435°F 201724%
Sep 1972°F45°F88°F 202337°F 201224%
Sep 2072°F44°F89°F 202242°F 201524%
Sep 2171°F44°F85°F 201940°F 201724%
Sep 2271°F43°F86°F 201535°F 201324%
Sep 2370°F43°F87°F 202026°F 201224%
Sep 2470°F43°F83°F 202125°F 201224%
Sep 2569°F42°F87°F 201434°F 201224%
Sep 2669°F42°F92°F 201434°F 202123%
Sep 2768°F41°F96°F 202434°F 201823%
Sep 2868°F41°F90°F 202136°F 201823%
Sep 2967°F40°F97°F 202128°F 201823%
Sep 3067°F40°F97°F 202432°F 201523%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Bismarck, 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 (CDT).

September 1
sunrise 7:03 AM, sunset 8:22 PM
September 30
sunrise 7:41 AM, sunset 7:25 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00024011 (Bismarck), public domain. Records: NOAA GHCN-Daily, station USC00320818, 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.