Shasta weather in September: Shasta, California: normal highs, lows, rain and records for September
Shasta in September has a normal high of 90°F and a normal low of 63°F, a daily mean of 77°F, falling from 94°F on the 1st to 86°F by the 30th. Measurable precipitation falls on 2 days in a normal September, 0.52 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 17°C, 13 mm of precipitation in September.
- NOAA stationShasta Dam
- Station IDUSC00048135
- Location40.71°N 122.42°W
- Elevation1,075 ft (328 m)
- From the center9 miles
- Population (census place)1,330
- Jan 55° 41°
- Feb 59° 42°
- Mar 63° 44°
- Apr 70° 48°
- May 79° 55°
- Jun 88° 63°
- Jul 97° 69°
- Aug 96° 68°
- Sep 90° 63°
- Oct 78° 55°
- Nov 62° 46°
- Dec 54° 41°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Shasta in September?
The normal high is 90°F and the normal low 63°F, for a daily mean of 76.6°F. September is 5.2°F cooler than August and 10.4°F warmer than October. September is the 3rd warmest month of the year in Shasta and the 10th wettest. Across the month the normal high falls 8°F, from 94°F on September 1 to 86°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 74°F and 79°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 10%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 94°F | 66°F | 4% | 2% |
| September 8 | 93°F | 65°F | 5% | 3% |
| September 15 | 91°F | 63°F | 6% | 3% |
| September 22 | 89°F | 62°F | 8% | 4% |
| September 30 | 86°F | 60°F | 10% | 6% |
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 | 94°F | 66°F | 4% | 2% | 13 h 10 min |
| September 2 | 94°F | 66°F | 4% | 2% | 13 h 10 min |
| September 3 | 93°F | 65°F | 4% | 2% | 13 h |
| September 4 | 93°F | 65°F | 4% | 2% | 13 h |
| September 5 | 93°F | 65°F | 4% | 2% | 13 h |
| September 6 | 93°F | 65°F | 4% | 3% | 13 h |
| September 7 | 93°F | 65°F | 5% | 3% | 12 h 50 min |
| September 8 | 93°F | 65°F | 5% | 3% | 12 h 50 min |
| September 9 | 92°F | 64°F | 5% | 3% | 12 h 50 min |
| September 10 | 92°F | 64°F | 5% | 3% | 12 h 50 min |
| September 11 | 92°F | 64°F | 5% | 3% | 12 h 40 min |
| September 12 | 92°F | 64°F | 6% | 3% | 12 h 40 min |
| September 13 | 91°F | 64°F | 6% | 3% | 12 h 40 min |
| September 14 | 91°F | 64°F | 6% | 3% | 12 h 30 min |
| September 15 | 91°F | 63°F | 6% | 3% | 12 h 30 min |
| September 16 | 91°F | 63°F | 7% | 4% | 12 h 30 min |
| September 17 | 90°F | 63°F | 7% | 4% | 12 h 30 min |
| September 18 | 90°F | 63°F | 7% | 4% | 12 h 20 min |
| September 19 | 90°F | 63°F | 7% | 4% | 12 h 20 min |
| September 20 | 89°F | 62°F | 8% | 4% | 12 h 20 min |
| September 21 | 89°F | 62°F | 8% | 4% | 12 h 20 min |
| September 22 | 89°F | 62°F | 8% | 4% | 12 h 10 min |
| September 23 | 88°F | 62°F | 8% | 4% | 12 h 10 min |
| September 24 | 88°F | 61°F | 9% | 5% | 12 h 10 min |
| September 25 | 88°F | 61°F | 9% | 5% | 12 h 10 min |
| September 26 | 87°F | 61°F | 9% | 5% | 12 h |
| September 27 | 87°F | 61°F | 9% | 5% | 12 h |
| September 28 | 86°F | 60°F | 10% | 5% | 12 h |
| September 29 | 86°F | 60°F | 10% | 5% | 11 h 50 min |
| September 30 | 86°F | 60°F | 10% | 6% | 11 h 50 min |
- Normal high
- 90°FSeptember average
- Normal low
- 63°FSeptember average
- Precipitation
- 0.52 inmonth total
- Days with precipitation
- 20.01 inch or more
- Days at 90°F or more
- 17
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 29
- Days at 80°F or more
- 26
- Sunshine
- 94%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00048135; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Shasta in September?
On a given September day the chance of 0.01 inch or more is 7% on average, highest around September 30 (10%). In all, 0.52 in falls on 2 days of a normal September.
In a normal September in Shasta, 17 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00048135.
What are the records for September in Shasta?
The warmest September temperature on this station's record (since 1943) is 114°F, on September 3, 1955; the coldest is 43°F, on September 30, 1971. The wettest September brought 8.89 in (1977).
The September mean against the 1991-2020 normal of 76.6°F: 2021 78.4°F (+1.8), 2022 78.2°F (+1.6), 2023 72.7°F (−3.9), 2024 78.5°F (+1.9), 2025 77.2°F (+0.6). 4 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 78.4°F | +1.8°F | 0.61 in |
| 2022 | 78.2°F | +1.6°F | 1.22 in |
| 2023 | 72.7°F | −3.9°F | 2.14 in |
| 2024 | 78.5°F | +1.9°F | 0.35 in |
| 2025 | 77.2°F | +0.6°F | 1.13 in |
Source: records: ACIS, station USC00048135; recent months: ACIS, station USC00048135. Records and recent months use complete months only.
How does September in Shasta 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; Shasta's is 90°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.