Eureka, CA

California · Records since 1886–2026

☁️ 59°F
Currently in Eureka
As of 11:30 AM PDT

Records for September 11

🔥 Record High

81°F

September 11, 1924

+17° from 64° normal

❄ Record Low

44°F

September 11, 1889

-7° from 51° normal
🌞 Normal high: 64°F 🌑 Normal low: 51°F 1991–2020 normals

All-Time Records — Eureka

🔥
87°F
Hottest Day Ever
Sep 28, 2020
❄
20°F
Coldest Day Ever
Jan 14, 1888
🌧
6.79"
Wettest Day Ever
Dec 27, 2002
☃
3.4"
Most Snow in One Day
Jan 13, 1907

First & Last Dates — Eureka

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)
352 days
Longest growing season
1991
226 days
Shortest growing season
1929
293 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 81°F September 11, 1924
2 76°F September 11, 1963
3 75°F September 11, 1916
4 73°F September 11, 1913
5 72°F September 11, 2017
6 72°F September 11, 2004
7 72°F September 11, 1988
8 72°F September 11, 1929
9 71°F September 11, 1997
10 71°F September 11, 1974

Top 5 Record Lows — September 11

# Temp Date
🥶 44°F September 11, 1889
2 45°F September 11, 1928
3 46°F September 11, 2012
4 46°F September 11, 1948
5 46°F September 11, 1906
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 1886–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Eureka

threshold: 66°F (90th percentile of historical Jun–Aug highs)
4.6
Avg heat wave length
days (historical)
72°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
3
Heat waves 2026
so far

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Eureka

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 20, 1997 – Sep 22, 1997 34 75°F (Sep 13) 71°F 56°F
2 Aug 22, 1979 – Sep 15, 1979 25 85°F (Sep 12) 70°F 57°F
3 Aug 3, 1994 – Aug 25, 1994 23 69°F (Aug 10) 67°F 56°F
4 Sep 5, 2019 – Sep 25, 2019 21 76°F (Sep 15) 69°F 55°F
5 Sep 14, 2020 – Sep 29, 2020 16 87°F (Sep 28) 71°F 55°F
6 Aug 1, 1983 – Aug 15, 1983 15 76°F (Aug 12) 69°F 56°F
7 Jul 21, 2026 – Aug 4, 2026 15 73°F (Jul 22) 68°F 54°F
8 Jul 12, 2007 – Jul 24, 2007 13 74°F (Jul 21) 70°F 57°F
9 Aug 4, 2003 – Aug 16, 2003 13 71°F (Aug 8) 70°F 55°F
10 Aug 23, 2019 – Sep 3, 2019 12 73°F (Aug 29) 69°F 55°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

54
2026 total
above-normal nights
45.6
Avg / summer
1970–2020
76
Most in a summer
2004

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 (1886–2026)

Blue = above average · tan = below average · gold = 2026 (partial)

Heavy Rain Days Per Year (≥ 1.0")

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

This Year — 2026

How Eureka is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

16.69"
2026 YTD
Normal: 24.56"
-7.87"
0.33"
September so far
September normal: 0.68"
-0.35"
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 · Eureka is 7.87" behind the normal pace

Period Review — Sep 3 – Sep 10, 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)
59.6°F
Average temperature
18th-warmest of 140
+1.5°
vs. average
Normal: 58.1°F (1991–2020)
0.00"
Precipitation
1st-driest of 140
-0.04"
vs. average
Normal: 0.04" · 0% of normal

Average Temperature by Year — Sep 3 – Sep 10

1887–2026 · 2026 highlighted · trend +0.23° per decade (warming since 1887)

Precipitation by Year — Sep 3 – Sep 10

1887–2026 · 2026 highlighted · trend -0.01" per decade (drier since 1887)

Warmest Sep 3 – Sep 10 on Record

# Year Avg Temp
1 1997 63.8°F
2 1979 63.6°F
3 2017 63.0°F
4 2019 62.9°F
5 2013 62.0°F
6 1958 61.9°F
7 1990 61.8°F
8 2025 61.5°F
9 1994 61.4°F
10 1983 60.8°F

Coolest Sep 3 – Sep 10 on Record

# Year Avg Temp
1 1928 53.1°F
2 1909 53.2°F
3 1910 53.2°F
4 1901 53.3°F
5 2012 53.3°F
6 1935 53.7°F
7 1892 53.8°F
8 1904 53.9°F
9 1895 53.9°F
10 1950 53.9°F

Wettest Sep 3 – Sep 10 on Record

# Year Total
1 1978 2.56"
2 1912 1.88"
3 1925 1.18"
4 1893 1.04"
5 1930 0.86"
6 1899 0.74"
7 1952 0.73"
8 1919 0.63"
9 1947 0.58"
10 2025 0.55"

Driest Sep 3 – Sep 10 on Record

# Year Total
1 2026 0.00"
2 2024 0.00"
3 2023 0.00"
4 2018 0.00"
5 2016 0.00"
6 2015 0.00"
7 2014 0.00"
8 2013 0.00"
9 2011 0.00"
10 2008 0.00"
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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