Eureka, CA
California · Records since 1886–2026
Records for September 11
🔥 Record High
September 11, 1924
+17° from 64° normal❄ Record Low
September 11, 1889
-7° from 51° normalAll-Time Records — Eureka
First & Last Dates — Eureka
How early and how late each seasonal turning point has ever arrived, across the full period of record
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 |
Heat Wave Summary — Eureka
threshold: 66°F (90th percentile of historical Jun–Aug highs)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
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
123 of 253 days with data were above the 1991–2020 normal high for their date.
Precipitation, Year to Date
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 1 – Nov 30, 2026
Any window, evaluated against every other year on record — 91 days
Average Temperature by Year — Sep 1 – Nov 30
1887–2025 · 2026 highlighted · trend +0.11° per decade (warming since 1887)
Precipitation by Year — Sep 1 – Nov 30
1887–2025 · 2026 highlighted · trend -0.03" per decade (drier since 1887)