Oroville weather in September: Oroville, California: normal highs, lows, rain and records for September
Oroville in September has a normal high of 89°F and a normal low of 59°F, a daily mean of 74°F, falling from 92°F on the 1st to 85°F by the 30th. Measurable precipitation falls on 1 days in a normal September, 0.16 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 15°C, 4 mm of precipitation in September.
- NOAA stationOroville Municipal Airport
- Station IDUSW00093210
- Location39.49°N 121.62°W
- Elevation190 ft (58 m)
- Population19,712
- Jan 55° 40°
- Feb 61° 42°
- Mar 66° 45°
- Apr 72° 49°
- May 81° 55°
- Jun 90° 61°
- Jul 96° 65°
- Aug 94° 64°
- Sep 89° 59°
- Oct 78° 52°
- Nov 64° 44°
- 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 Oroville in September?
The normal high is 89°F and the normal low 59°F, for a daily mean of 74.0°F. September is 4.8°F cooler than August and 8.9°F warmer than October. September is the 4th warmest month of the year in Oroville and the 10th wettest. Across the month the normal high falls 7°F, from 92°F on September 1 to 85°F on September 30. From one year to the next September's mean temperature typically moves about 1.6°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 72°F and 76°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 8%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 92°F | 62°F | 2% | 1% |
| September 8 | 91°F | 61°F | 3% | 1% |
| September 15 | 89°F | 60°F | 4% | 2% |
| September 22 | 87°F | 58°F | 6% | 3% |
| September 30 | 85°F | 56°F | 8% | 4% |
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 | 92°F | 62°F | 2% | 1% | 13 h 10 min |
| September 2 | 92°F | 62°F | 2% | 1% | 13 h |
| September 3 | 92°F | 62°F | 2% | 1% | 13 h |
| September 4 | 91°F | 62°F | 2% | 1% | 13 h |
| September 5 | 91°F | 61°F | 2% | 1% | 13 h |
| September 6 | 91°F | 61°F | 2% | 1% | 12 h 50 min |
| September 7 | 91°F | 61°F | 2% | 1% | 12 h 50 min |
| September 8 | 91°F | 61°F | 3% | 1% | 12 h 50 min |
| September 9 | 90°F | 61°F | 3% | 1% | 12 h 50 min |
| September 10 | 90°F | 61°F | 3% | 1% | 12 h 40 min |
| September 11 | 90°F | 61°F | 3% | 1% | 12 h 40 min |
| September 12 | 90°F | 60°F | 3% | 2% | 12 h 40 min |
| September 13 | 89°F | 60°F | 4% | 2% | 12 h 40 min |
| September 14 | 89°F | 60°F | 4% | 2% | 12 h 30 min |
| September 15 | 89°F | 60°F | 4% | 2% | 12 h 30 min |
| September 16 | 89°F | 60°F | 4% | 2% | 12 h 30 min |
| September 17 | 88°F | 59°F | 4% | 2% | 12 h 30 min |
| September 18 | 88°F | 59°F | 5% | 2% | 12 h 20 min |
| September 19 | 88°F | 59°F | 5% | 2% | 12 h 20 min |
| September 20 | 88°F | 59°F | 5% | 2% | 12 h 20 min |
| September 21 | 87°F | 58°F | 5% | 3% | 12 h 20 min |
| September 22 | 87°F | 58°F | 6% | 3% | 12 h 10 min |
| September 23 | 87°F | 58°F | 6% | 3% | 12 h 10 min |
| September 24 | 87°F | 58°F | 6% | 3% | 12 h 10 min |
| September 25 | 86°F | 57°F | 6% | 3% | 12 h 10 min |
| September 26 | 86°F | 57°F | 7% | 3% | 12 h |
| September 27 | 86°F | 57°F | 7% | 3% | 12 h |
| September 28 | 85°F | 57°F | 7% | 4% | 12 h |
| September 29 | 85°F | 56°F | 7% | 4% | 11 h 50 min |
| September 30 | 85°F | 56°F | 8% | 4% | 11 h 50 min |
- Normal high
- 89°FSeptember average
- Normal low
- 59°FSeptember average
- Precipitation
- 0.16 inmonth total
- Days with precipitation
- 10.01 inch or more
- Days at 90°F or more
- 15
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 26
- Sunshine
- 95%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093210; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Oroville in September?
On a given September day the chance of 0.01 inch or more is 4% on average, highest around September 30 (8%). In all, 0.16 in falls on 1 days of a normal September.
In a normal September in Oroville, 15 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093210.
What are the records for September in Oroville?
The warmest September temperature on this station's record (since 1998) is 111°F, on September 6, 2022; the coldest is 43°F, on September 29, 2007. The wettest September brought 1.58 in (2022).
The September mean against the 1991-2020 normal of 74.0°F: 2021 76.6°F (+2.6), 2022 78.1°F (+4.1), 2023 72.9°F (−1.1), 2024 76.9°F (+2.9), 2025 75.2°F (+1.2), 2026 72.2°F (−1.8). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 76.6°F | +2.6°F | 0.05 in |
| 2022 | 78.1°F | +4.1°F | 1.58 in |
| 2023 | 72.9°F | −1.1°F | 1.20 in |
| 2024 | 76.9°F | +2.9°F | 0.00 in |
| 2025 | 75.2°F | +1.2°F | 0.08 in |
| 2026 | 72.2°F | −1.8°F | 0.05 in |
Source: records: ACIS, station USW00093210; recent months: ACIS, station USW00093210. Records and recent months use complete months only.
How does September in Oroville 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; Oroville's is 89°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.