Grand Forks, ND

North Dakota · Records since 1941–2026

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

Records for September 26

🔥 Record High

92°F

September 26, 1974

+26° from 66° normal

❄ Record Low

20°F

September 26, 1942

-21° from 41° normal
🌞 Normal high: 66°F 🌑 Normal low: 41°F 1991–2020 normals

All-Time Records — Grand Forks

🔥
104°F
Hottest Day Ever
Jul 5, 1988
❄
-43°F
Coldest Day Ever
Jan 30, 2004
🌧
4.44"
Wettest Day Ever
Jul 16, 1995
☃
17.0"
Most Snow in One Day
Mar 4, 1966

First & Last Dates — Grand Forks

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
2024
55 days
Shortest growing season
1972
134 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 26

# Temp Date
🏆 92°F September 26, 1974
2 91°F September 26, 1963
3 88°F September 26, 2024
4 87°F September 26, 1952
5 86°F September 26, 1990
6 85°F September 26, 2015
7 85°F September 26, 2014
8 85°F September 26, 1956
9 83°F September 26, 2025
10 83°F September 26, 1997

Top 5 Record Lows — September 26

# Temp Date
🥶 20°F September 26, 1942
2 23°F September 26, 1965
3 25°F September 26, 1989
4 25°F September 26, 1985
5 26°F September 26, 2012
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 1941–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Grand Forks

threshold: 90°F (90th percentile of historical Jun–Aug highs)
3.8
Avg heat wave length
days (historical)
96°
Avg peak temp
during heat waves
2
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1941–2026
20
2026 so far
12
Avg/year 1970–2025
12
Avg/year (last 10 complete)
32
Most in a year (1976)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Grand Forks

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 21, 1969 – Aug 29, 1969 9 94°F (Aug 26) 91°F 60°F
2 Aug 18, 1976 – Aug 24, 1976 7 100°F (Aug 20) 96°F 63°F
3 Jun 14, 1995 – Jun 20, 1995 7 100°F (Jun 17) 95°F 70°F
4 Jul 16, 1955 – Jul 21, 1955 6 98°F (Jul 21) 93°F 64°F
5 Jun 4, 1970 – Jun 9, 1970 6 98°F (Jun 6) 93°F 60°F
6 Jul 11, 2006 – Jul 16, 2006 6 98°F (Jul 16) 94°F 60°F
7 Jul 20, 1963 – Jul 25, 1963 6 97°F (Jul 25) 92°F 64°F
8 Jun 2, 1988 – Jun 7, 1988 6 96°F (Jun 7) 94°F 60°F
9 Aug 14, 2003 – Aug 19, 2003 6 95°F (Aug 17) 93°F 62°F
10 Jun 30, 2021 – Jul 5, 2021 6 94°F (Jul 3) 92°F 62°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

52
2026 total
above-normal nights
45.4
Avg / summer
1970–2020
67
Most in a summer
1997

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 (1941–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1941, annual totals have trended +0.32" per decade, about +2.7" 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 Grand Forks is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

16.24"
2026 YTD
Normal: 17.87"
-1.63"
3.35"
September so far
September normal: 2.26"
+1.09"
5
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Grand Forks is 1.63" behind the normal pace

Period Review — Sep 18 – Sep 25, 2026

Any window, evaluated against every other year on record — 8 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
58.8°F
Average temperature
19th-warmest of 86
+2.7°
vs. average
Normal: 56.1°F (1991–2020)

Average Temperature by Year — Sep 18 – Sep 25

1941–2026 · 2026 highlighted · trend +0.98° per decade (warming since 1941)

Precipitation by Year — Sep 18 – Sep 25

1941–2025 · 2026 highlighted · trend +0.03" per decade (wetter since 1941)

Warmest Sep 18 – Sep 25 on Record

# Year Avg Temp
1 2009 65.1°F
2 2023 64.9°F
3 2024 64.6°F
4 2019 64.5°F
5 2025 63.3°F
6 2014 62.9°F
7 2008 62.4°F
8 1958 61.8°F
9 2016 61.4°F
10 2020 61.4°F

Coolest Sep 18 – Sep 25 on Record

# Year Avg Temp
1 1965 43.8°F
2 1942 44.3°F
3 1957 44.9°F
4 1995 45.8°F
5 1985 46.2°F
6 1980 46.4°F
7 1947 47.0°F
8 1945 48.1°F
9 1973 48.3°F
10 2012 48.6°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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