Bismarck, ND

North Dakota · Records since 1874–2026

☁️ 62°F
Currently in Bismarck
As of 9:15 PM CDT

Records for September 26

🔥 Record High

96°F

September 26, 2024

+27° from 69° normal

❄ Record Low

16°F

September 26, 1942

-26° from 42° normal
🌞 Normal high: 69°F 🌑 Normal low: 42°F 1991–2020 normals

All-Time Records — Bismarck

🔥
114°F
Hottest Day Ever
Jul 6, 1936
❄
-45°F
Coldest Day Ever
Feb 16, 1936
🌧
4.63"
Wettest Day Ever
Aug 21, 1998
☃
17.3"
Most Snow in One Day
Apr 14, 2013

First & Last Dates — Bismarck

How early and how late each seasonal turning point has ever arrived, across the full period of record

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Range ever recorded Normal date (1991–2020)
172 days
Longest growing season
2025
65 days
Shortest growing season
1884
132 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 26

# Temp Date
🏆 96°F September 26, 2024
2 96°F September 26, 1963
3 94°F September 26, 1952
4 93°F September 26, 2014
5 91°F September 26, 1974
6 89°F September 26, 2021
7 89°F September 26, 1943
8 89°F September 26, 1892
9 88°F September 26, 1956
10 87°F September 26, 2015

Top 5 Record Lows — September 26

# Temp Date
🥶 16°F September 26, 1942
2 18°F September 26, 1965
3 24°F September 26, 1928
4 25°F September 26, 1985
5 25°F September 26, 1984
About this data — Records are sourced from the NOAA Threadex dataset via RCC ACIS, a quality-controlled record for long-term climate stations. Threadex adjusts for station relocations and observation-time changes, making records comparable across all years since 1874–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Bismarck

threshold: 93°F (90th percentile of historical Jun–Aug highs)
4.1
Avg heat wave length
days (historical)
101°
Avg peak temp
during heat waves
3
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

Days ≥ 90°F Per Year

1875–2026
33
2026 so far
20
Avg/year 1970–2025
25
Avg/year (last 10 complete)
53
Most in a year (1936)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Bismarck

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 4, 1936 – Jul 19, 1936 16 114°F (Jul 6) 104°F 73°F
2 Jul 15, 2021 – Jul 26, 2021 12 105°F (Jul 22) 99°F 66°F
3 Aug 11, 2003 – Aug 20, 2003 10 106°F (Aug 17) 99°F 66°F
4 Jun 17, 1988 – Jun 24, 1988 8 105°F (Jun 21) 100°F 63°F
5 Aug 21, 1969 – Aug 28, 1969 8 101°F (Aug 28) 96°F 65°F
6 Jul 5, 1974 – Jul 12, 1974 8 100°F (Jul 7) 96°F 60°F
7 Jul 25, 1988 – Jul 31, 1988 7 106°F (Jul 27) 99°F 58°F
8 Jul 10, 2006 – Jul 16, 2006 7 106°F (Jul 16) 101°F 60°F
9 Aug 24, 1991 – Aug 30, 1991 7 103°F (Aug 27) 98°F 63°F
10 Aug 17, 1976 – Aug 23, 1976 7 102°F (Aug 18) 98°F 61°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

Nights where the overnight low exceeded the 1991–2020 normal low

58
2026 total
above-normal nights
41.7
Avg / summer
1970–2020
73
Most in a summer
2021

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Annual totals and trend across the full period of record · see this year's standing →

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1874–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1874, annual totals have trended +0.12" per decade, about +1.7" across the record.

Heavy Rain Days Per Year (≥ 1.0")

Compare year-to-year changes in days with heavy rainfall (≥ 1.0")

This Year — 2026

How Bismarck is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

151 of 267 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

10.37"
2026 YTD
Normal: 16.03"
-5.66"
1.20"
September so far
September normal: 1.72"
-0.52"
0
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Bismarck is 5.66" behind the normal pace

Period Review — Sep 1 – Sep 25, 2026

Any window, evaluated against every other year on record — 25 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
64.6°F
Average temperature
11th-warmest of 152
+4.0°
vs. average
Normal: 60.6°F (1991–2020)

Average Temperature by Year — Sep 1 – Sep 25

1875–2026 · 2026 highlighted · trend +0.19° per decade (warming since 1875)

Precipitation by Year — Sep 1 – Sep 25

1875–2025 · 2026 highlighted · trend +0.04" per decade (wetter since 1875)

Warmest Sep 1 – Sep 25 on Record

# Year Avg Temp
1 1897 67.1°F
2 1908 67.0°F
3 2024 66.9°F
4 2009 66.8°F
5 1948 65.7°F
6 1940 65.5°F
7 2013 65.4°F
8 1906 65.1°F
9 1998 65.0°F
10 2015 64.7°F

Coolest Sep 1 – Sep 25 on Record

# Year Avg Temp
1 1965 47.6°F
2 1903 52.5°F
3 1993 53.6°F
4 1918 54.0°F
5 1929 54.0°F
6 1934 54.1°F
7 1973 54.3°F
8 1896 54.3°F
9 1986 54.3°F
10 1926 54.4°F
About this data. Pick any start and end date and this becomes the same kind of review as the Month and Fall tabs, just for exactly the window you asked for — the generalized version of the same engine, evaluated across every year on record. Average temperature is the mean of each day's (high + low) / 2; precipitation is the sum of daily totals. A year missing more than about a fifth of the window's days is excluded from the temperature ranking; any missing day excludes a year from the precipitation ranking, since an unreported day is unreported rain. Ranges that cross from December into January aren't supported yet. Normals are the 1991–2020 mean for the same window.
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