Eureka weather in September: Eureka, California: normal highs, lows, rain and records for September
Eureka in September has a normal high of 64°F and a normal low of 51°F, a daily mean of 57°F, holding near 64°F all month. Measurable precipitation falls on 5 days in a normal September, 0.68 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 18°C and low of 10°C, 17 mm of precipitation in September.
- NOAA stationEureka Weather Office Woodley Island
- Station IDUSW00024213
- Location40.81°N 124.16°W
- Elevation20 ft (6 m)
- From the centerunder 1 mile
- Population25,412
- Jan 55° 41°
- Feb 55° 41°
- Mar 56° 42°
- Apr 57° 44°
- May 60° 48°
- Jun 62° 50°
- Jul 63° 52°
- Aug 64° 53°
- Sep 64° 51°
- Oct 62° 47°
- Nov 58° 43°
- Dec 55° 40°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Eureka in September?
The normal high is 64°F and the normal low 51°F, for a daily mean of 57.2°F. September is 1.3°F cooler than August and 2.9°F warmer than October. September is the 3rd warmest month of the year in Eureka and the 10th wettest. Across the month the normal high falls 1°F, from 64°F on September 1 to 63°F on September 30. From one year to the next September's mean temperature typically moves about 2.2°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 55°F and 59°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 21%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 64°F | 52°F | 12% | 3% |
| September 8 | 64°F | 51°F | 14% | 4% |
| September 15 | 64°F | 51°F | 17% | 6% |
| September 22 | 64°F | 50°F | 19% | 7% |
| September 30 | 63°F | 49°F | 21% | 10% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 64°F | 52°F | 12% | 3% | 13 h 10 min |
| September 2 | 64°F | 52°F | 12% | 3% | 13 h 10 min |
| September 3 | 64°F | 52°F | 13% | 3% | 13 h |
| September 4 | 64°F | 52°F | 13% | 3% | 13 h |
| September 5 | 64°F | 52°F | 13% | 4% | 13 h |
| September 6 | 64°F | 52°F | 14% | 4% | 13 h |
| September 7 | 64°F | 52°F | 14% | 4% | 12 h 50 min |
| September 8 | 64°F | 51°F | 14% | 4% | 12 h 50 min |
| September 9 | 64°F | 51°F | 15% | 4% | 12 h 50 min |
| September 10 | 64°F | 51°F | 15% | 5% | 12 h 50 min |
| September 11 | 64°F | 51°F | 15% | 5% | 12 h 40 min |
| September 12 | 64°F | 51°F | 16% | 5% | 12 h 40 min |
| September 13 | 64°F | 51°F | 16% | 5% | 12 h 40 min |
| September 14 | 64°F | 51°F | 16% | 6% | 12 h 30 min |
| September 15 | 64°F | 51°F | 17% | 6% | 12 h 30 min |
| September 16 | 64°F | 51°F | 17% | 6% | 12 h 30 min |
| September 17 | 64°F | 50°F | 17% | 6% | 12 h 30 min |
| September 18 | 64°F | 50°F | 17% | 6% | 12 h 20 min |
| September 19 | 64°F | 50°F | 18% | 7% | 12 h 20 min |
| September 20 | 64°F | 50°F | 18% | 7% | 12 h 20 min |
| September 21 | 64°F | 50°F | 18% | 7% | 12 h 20 min |
| September 22 | 64°F | 50°F | 19% | 7% | 12 h 10 min |
| September 23 | 64°F | 50°F | 19% | 8% | 12 h 10 min |
| September 24 | 64°F | 50°F | 19% | 8% | 12 h 10 min |
| September 25 | 64°F | 49°F | 19% | 8% | 12 h 10 min |
| September 26 | 64°F | 49°F | 20% | 8% | 12 h |
| September 27 | 64°F | 49°F | 20% | 9% | 12 h |
| September 28 | 64°F | 49°F | 20% | 9% | 12 h |
| September 29 | 63°F | 49°F | 21% | 9% | 11 h 50 min |
| September 30 | 63°F | 49°F | 21% | 10% | 11 h 50 min |
- Normal high
- 64°FSeptember average
- Normal low
- 51°FSeptember average
- Precipitation
- 0.68 inmonth total
- Days with precipitation
- 50.01 inch or more
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 3
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024213; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Eureka in September?
On a given September day the chance of 0.01 inch or more is 17% on average, highest around September 30 (21%). In all, 0.68 in falls on 5 days of a normal September.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024213.
What are the records for September in Eureka?
The warmest September temperature on Eureka's official record (since 1886) is 87°F, on September 2, 2017; the coldest is 36°F, on September 22, 1895. The wettest September brought 4.26 in (1901).
The September mean against the 1991-2020 normal of 57.2°F: 2021 56.2°F (−1.0), 2022 58.8°F (+1.6), 2023 58.6°F (+1.4), 2024 57.4°F (+0.2), 2025 60.0°F (+2.8), 2026 58.6°F (+1.4). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 56.2°F | −1.0°F | 1.24 in |
| 2022 | 58.8°F | +1.6°F | 0.43 in |
| 2023 | 58.6°F | +1.4°F | 1.83 in |
| 2024 | 57.4°F | +0.2°F | 0.07 in |
| 2025 | 60.0°F | +2.8°F | 1.71 in |
| 2026 | 58.6°F | +1.4°F | 0.64 in |
Source: records: ACIS, NWS threaded record EKAthr; recent months: ACIS, station USW00024213. Records and recent months use complete months only.
How does September in Eureka compare across California?
Across the 219 places PlainClimate covers in California, September normal highs run from 64°F in Eureka to 104°F in Brawley; Eureka's is 64°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.