Ukiah, CA

California · Records since 1893–2026

☀️ 85°F
Currently in Ukiah
As of 11:30 AM PDT

Records for September 11

🔥 Record High

106°F

September 11, 1899

+16° from 90° normal

❄ Record Low

39°F

September 11, 1928

-13° from 52° normal
🌞 Normal high: 90°F 🌑 Normal low: 52°F 1991–2020 normals

All-Time Records — Ukiah

🔥
117°F
Hottest Day Ever
Jul 6, 2024
❄
12°F
Coldest Day Ever
Jan 12, 1898
🌧
6.18"
Wettest Day Ever
Dec 22, 1964
☃
5.0"
Most Snow in One Day
Mar 2, 1896

First & Last Dates — Ukiah

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)
323 days
Longest growing season
2014
138 days
Shortest growing season
1919
250 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 106°F September 11, 1899
2 105°F September 11, 1951
3 105°F September 11, 1948
4 105°F September 11, 1924
5 105°F September 11, 1922
6 104°F September 11, 2015
7 104°F September 11, 1979
8 104°F September 11, 1945
9 103°F September 11, 2009
10 103°F September 11, 1944

Top 5 Record Lows — September 11

# Temp Date
🥶 39°F September 11, 1928
2 40°F September 11, 1931
3 40°F September 11, 1916
4 40°F September 11, 1915
5 41°F September 11, 1909
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 1893–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Ukiah

threshold: 102°F (90th percentile of historical Jun–Aug highs)
3.9
Avg heat wave length
days (historical)
107°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1893–2026
81
2026 so far
73
Avg/year 1970–2025
94
Avg/year (last 10 complete)
113
Most in a year (2020)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Ukiah

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 24, 1924 – Aug 31, 1924 8 113°F (Aug 26) 107°F 49°F
2 Aug 3, 1978 – Aug 10, 1978 8 112°F (Aug 8) 108°F 65°F
3 Jul 17, 1960 – Jul 24, 1960 8 111°F (Jul 20) 106°F 59°F
4 Jul 2, 2024 – Jul 8, 2024 7 117°F (Jul 6) 111°F 63°F
5 Aug 27, 1950 – Sep 2, 1950 7 112°F (Sep 1) 107°F 57°F
6 Jul 4, 1905 – Jul 10, 1905 7 111°F (Jul 7) 107°F 57°F
7 Jun 27, 1924 – Jul 3, 1924 7 111°F (Jul 1) 107°F 52°F
8 Sep 5, 1944 – Sep 11, 1944 7 109°F (Sep 8) 105°F 54°F
9 Aug 13, 1967 – Aug 19, 1967 7 109°F (Aug 17) 106°F 57°F
10 Sep 4, 1902 – Sep 10, 1902 7 108°F (Sep 9) 104°F 46°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

51
2026 total
above-normal nights
38.6
Avg / summer
1970–2020
70
Most in a summer
2024

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 (1893–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1893, annual totals have trended -0.18" per decade, about -2.4" 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 Ukiah is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

149 of 253 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

14.44"
2026 YTD
Normal: 22.46"
-8.02"
0.16"
September so far
September normal: 0.16"
+0.00"
3
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Ukiah is 8.02" behind the normal pace

Period Review — Mar 1 – May 31, 2026

Any window, evaluated against every other year on record — 92 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
61.1°F
Average temperature
2nd-warmest of 133
+4.2°
vs. average
Normal: 56.9°F (1991–2020)
3.66"
Precipitation
14th-driest of 118
-5.59"
vs. average
Normal: 9.25" · 40% of normal

Average Temperature by Year — Mar 1 – May 31

1893–2026 · 2026 highlighted · trend +0.22° per decade (warming since 1893)

Precipitation by Year — Mar 1 – May 31

1893–2026 · 2026 highlighted · trend +0.01" per decade (wetter since 1893)

Warmest Mar 1 – May 31 on Record

# Year Avg Temp
1 1934 61.5°F
2 2026 61.1°F
3 1992 60.9°F
4 1947 60.9°F
5 1926 60.7°F
6 1931 60.1°F
7 2015 60.0°F
8 2014 59.9°F
9 1987 59.6°F
10 1966 59.3°F

Coolest Mar 1 – May 31 on Record

# Year Avg Temp
1 1893 51.2°F
2 1896 51.8°F
3 1902 52.1°F
4 1917 52.3°F
5 1899 52.5°F
6 1948 52.7°F
7 2010 52.7°F
8 1920 52.9°F
9 1967 53.1°F
10 1898 53.3°F

Wettest Mar 1 – May 31 on Record

# Year Total
1 1995 25.92"
2 1907 20.91"
3 2006 19.18"
4 1904 17.09"
5 1991 16.67"
6 1963 16.29"
7 1948 15.46"
8 1998 15.36"
9 1982 14.57"
10 2010 14.47"

Driest Mar 1 – May 31 on Record

# Year Total
1 1924 0.92"
2 2008 1.45"
3 1959 2.31"
4 2021 2.66"
5 1946 2.70"
6 1956 2.81"
7 2015 2.89"
8 1898 3.11"
9 2007 3.22"
10 2013 3.43"
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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