Red Bluff weather in September: Red Bluff, California: normal highs, lows, rain and records for September
Red Bluff in September has a normal high of 91°F and a normal low of 59°F, a daily mean of 75°F, falling from 95°F on the 1st to 87°F by the 30th. Measurable precipitation falls on 1 days in a normal September, 0.19 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 33°C and low of 15°C, 5 mm of precipitation in September.
- NOAA stationRed Bluff Municipal Airport
- Station IDUSW00024216
- Location40.15°N 122.25°W
- Elevation353 ft (108 m)
- Population14,286
- Jan 57° 38°
- Feb 61° 41°
- Mar 66° 44°
- Apr 72° 47°
- May 82° 55°
- Jun 91° 62°
- Jul 98° 66°
- Aug 96° 64°
- Sep 91° 59°
- Oct 79° 51°
- Nov 64° 43°
- Dec 56° 38°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Red Bluff in September?
The normal high is 91°F and the normal low 59°F, for a daily mean of 75.4°F. September is 4.5°F cooler than August and 10.3°F warmer than October. September is the 4th warmest month of the year in Red Bluff and the 10th wettest. Across the month the normal high falls 8°F, from 95°F on September 1 to 87°F on September 30. From one year to the next September's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 73°F and 77°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 | 95°F | 62°F | 2% | 1% |
| September 8 | 94°F | 61°F | 3% | 1% |
| September 15 | 92°F | 60°F | 4% | 2% |
| September 22 | 90°F | 58°F | 6% | 3% |
| September 30 | 87°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 | 95°F | 62°F | 2% | 1% | 13 h 10 min |
| September 2 | 94°F | 62°F | 2% | 1% | 13 h |
| September 3 | 94°F | 61°F | 2% | 1% | 13 h |
| September 4 | 94°F | 61°F | 2% | 1% | 13 h |
| September 5 | 94°F | 61°F | 2% | 1% | 13 h |
| September 6 | 94°F | 61°F | 3% | 1% | 12 h 50 min |
| September 7 | 94°F | 61°F | 3% | 1% | 12 h 50 min |
| September 8 | 94°F | 61°F | 3% | 1% | 12 h 50 min |
| September 9 | 93°F | 61°F | 3% | 1% | 12 h 50 min |
| September 10 | 93°F | 60°F | 3% | 1% | 12 h 40 min |
| September 11 | 93°F | 60°F | 3% | 2% | 12 h 40 min |
| September 12 | 93°F | 60°F | 4% | 2% | 12 h 40 min |
| September 13 | 93°F | 60°F | 4% | 2% | 12 h 40 min |
| September 14 | 92°F | 60°F | 4% | 2% | 12 h 30 min |
| September 15 | 92°F | 60°F | 4% | 2% | 12 h 30 min |
| September 16 | 92°F | 59°F | 4% | 2% | 12 h 30 min |
| September 17 | 91°F | 59°F | 5% | 2% | 12 h 30 min |
| September 18 | 91°F | 59°F | 5% | 2% | 12 h 20 min |
| September 19 | 91°F | 59°F | 5% | 2% | 12 h 20 min |
| September 20 | 91°F | 59°F | 5% | 3% | 12 h 20 min |
| September 21 | 90°F | 59°F | 6% | 3% | 12 h 20 min |
| September 22 | 90°F | 58°F | 6% | 3% | 12 h 10 min |
| September 23 | 90°F | 58°F | 6% | 3% | 12 h 10 min |
| September 24 | 89°F | 58°F | 6% | 3% | 12 h 10 min |
| September 25 | 89°F | 58°F | 6% | 3% | 12 h 10 min |
| September 26 | 88°F | 57°F | 7% | 3% | 12 h |
| September 27 | 88°F | 57°F | 7% | 3% | 12 h |
| September 28 | 88°F | 57°F | 7% | 3% | 12 h |
| September 29 | 87°F | 57°F | 7% | 4% | 11 h 50 min |
| September 30 | 87°F | 56°F | 8% | 4% | 11 h 50 min |
- Normal high
- 91°FSeptember average
- Normal low
- 59°FSeptember average
- Precipitation
- 0.19 inmonth total
- Days with precipitation
- 10.01 inch or more
- Days at 90°F or more
- 19
- 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
- 27
- Sunshine
- 94%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024216; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Red Bluff 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, 0.19 in falls on 1 days of a normal September.
In a normal September in Red Bluff, 19 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024216.
How humid and windy is Red Bluff in September?
At 3 p.m. the normal temperature is 85°F with 20% relative humidity and a dew point of 40°F; at 6 a.m. it is 58°F with 57% humidity. The wind averages 7.1 mph, most often from the southeast in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 58°F | 43°F | 57% | 6.4 mph | 91% |
| 9 a.m. | 70°F | 44°F | 38% | 8.3 mph | 87% |
| noon | 81°F | 42°F | 25% | 7.9 mph | 89% |
| 3 p.m. | 85°F | 40°F | 20% | 8.8 mph | 89% |
| 6 p.m. | 78°F | 43°F | 29% | 6.8 mph | 90% |
| 9 p.m. | 68°F | 45°F | 43% | 5.5 mph | 92% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024216. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Red Bluff?
The warmest September temperature on this station's record (since 1933) is 118°F, on September 4, 1988; the coldest is 41°F, on September 30, 2007. The wettest September brought 4.95 in (1989).
The September mean against the 1991-2020 normal of 75.4°F: 2021 76.9°F (+1.5), 2022 78.9°F (+3.5), 2023 73.8°F (−1.7), 2024 77.5°F (+2.1), 2025 76.2°F (+0.8), 2026 72.2°F (−3.2). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 76.9°F | +1.5°F | 0.26 in |
| 2022 | 78.9°F | +3.5°F | 0.61 in |
| 2023 | 73.8°F | −1.7°F | 0.49 in |
| 2024 | 77.5°F | +2.1°F | 0.62 in |
| 2025 | 76.2°F | +0.8°F | 0.27 in |
| 2026 | 72.2°F | −3.2°F | 0.14 in |
Source: records: ACIS, station USW00024216; recent months: ACIS, station USW00024216. Records and recent months use complete months only.
How does September in Red Bluff 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; Red Bluff's is 91°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Red Bluff in August96°F by day, 64°F at night
- Red Bluff in October79°F by day, 51°F at night
- Red Bluff through the yearEvery month, frost dates, records and recent years
- California in SeptemberThe statewide normal and the warmest and coolest places
- Brawley: California's warmest Septembernormal high 104°F