Fallbrook weather in September: Fallbrook, California: normal highs, lows, rain and records for September
Fallbrook in September has a normal high of 88°F and a normal low of 62°F, a daily mean of 75°F, falling from 90°F on the 1st to 86°F by the 30th. Measurable precipitation falls on 2 days in a normal September, 0.11 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 17°C, 3 mm of precipitation in September.
- NOAA stationFallbrook (5 mi NE)
- Station IDUSW00053151
- Location33.44°N 117.19°W
- Elevation1,140 ft (348 m)
- From the center5 miles
- Population (census place)32,467
- Jan 68° 47°
- Feb 67° 46°
- Mar 70° 48°
- Apr 72° 51°
- May 75° 53°
- Jun 81° 56°
- Jul 87° 60°
- Aug 89° 62°
- Sep 88° 62°
- Oct 83° 58°
- Nov 74° 52°
- Dec 67° 46°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Fallbrook in September?
The normal high is 88°F and the normal low 62°F, for a daily mean of 74.8°F. September is 0.7°F cooler than August and 4.2°F warmer than October. September is the 2nd warmest month of the year in Fallbrook and the 11th wettest. Across the month the normal high falls 4°F, from 90°F on September 1 to 86°F on September 30. From one year to the next September's mean temperature typically moves about 2.1°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 9%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 90°F | 63°F | 5% | 1% |
| September 8 | 89°F | 63°F | 5% | 1% |
| September 15 | 88°F | 62°F | 6% | 1% |
| September 22 | 87°F | 61°F | 7% | 2% |
| September 30 | 86°F | 60°F | 9% | 2% |
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 | 90°F | 63°F | 5% | 1% | 12 h 50 min |
| September 2 | 90°F | 63°F | 5% | 1% | 12 h 50 min |
| September 3 | 90°F | 63°F | 5% | 1% | 12 h 50 min |
| September 4 | 89°F | 63°F | 5% | 1% | 12 h 50 min |
| September 5 | 89°F | 63°F | 5% | 1% | 12 h 50 min |
| September 6 | 89°F | 63°F | 5% | 1% | 12 h 40 min |
| September 7 | 89°F | 63°F | 5% | 1% | 12 h 40 min |
| September 8 | 89°F | 63°F | 5% | 1% | 12 h 40 min |
| September 9 | 89°F | 62°F | 5% | 1% | 12 h 40 min |
| September 10 | 89°F | 62°F | 6% | 1% | 12 h 40 min |
| September 11 | 89°F | 62°F | 6% | 1% | 12 h 30 min |
| September 12 | 89°F | 62°F | 6% | 1% | 12 h 30 min |
| September 13 | 88°F | 62°F | 6% | 1% | 12 h 30 min |
| September 14 | 88°F | 62°F | 6% | 1% | 12 h 30 min |
| September 15 | 88°F | 62°F | 6% | 1% | 12 h 30 min |
| September 16 | 88°F | 62°F | 6% | 1% | 12 h 20 min |
| September 17 | 88°F | 62°F | 7% | 1% | 12 h 20 min |
| September 18 | 88°F | 62°F | 7% | 1% | 12 h 20 min |
| September 19 | 87°F | 62°F | 7% | 1% | 12 h 20 min |
| September 20 | 87°F | 61°F | 7% | 1% | 12 h 20 min |
| September 21 | 87°F | 61°F | 7% | 1% | 12 h 10 min |
| September 22 | 87°F | 61°F | 7% | 2% | 12 h 10 min |
| September 23 | 87°F | 61°F | 7% | 2% | 12 h 10 min |
| September 24 | 87°F | 61°F | 8% | 2% | 12 h 10 min |
| September 25 | 86°F | 61°F | 8% | 2% | 12 h 10 min |
| September 26 | 86°F | 61°F | 8% | 2% | 12 h |
| September 27 | 86°F | 61°F | 8% | 2% | 12 h |
| September 28 | 86°F | 60°F | 8% | 2% | 12 h |
| September 29 | 86°F | 60°F | 9% | 2% | 12 h |
| September 30 | 86°F | 60°F | 9% | 2% | 11 h 50 min |
- Normal high
- 88°FSeptember average
- Normal low
- 62°FSeptember average
- Precipitation
- 0.11 inmonth total
- Days with precipitation
- 20.01 inch or more
- Days at 90°F or more
- 14
- Daylight
- 12 h 50 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
- 91%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00053151; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Fallbrook in September?
On a given September day the chance of 0.01 inch or more is 6% on average, highest around September 30 (9%). In all, 0.11 in falls on 2 days of a normal September.
In a normal September in Fallbrook, 14 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00053151.
What are the records for September in Fallbrook?
The September mean against the 1991-2020 normal of 74.8°F: 2021 74.3°F (−0.5), 2022 78.6°F (+3.8), 2023 70.7°F (−4.1), 2024 75.2°F (+0.4), 2025 75.3°F (+0.5), 2026 76.8°F (+2.0). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 74.3°F | −0.5°F | 0.10 in |
| 2022 | 78.6°F | +3.8°F | 0.84 in |
| 2023 | 70.7°F | −4.1°F | 0.28 in |
| 2024 | 75.2°F | +0.4°F | 0.48 in |
| 2025 | 75.3°F | +0.5°F | 0.35 in |
| 2026 | 76.8°F | +2.0°F | 0.08 in |
Source: recent months: ACIS, station USW00053151. Records and recent months use complete months only.
How does September in Fallbrook 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; Fallbrook's is 88°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Fallbrook in August89°F by day, 62°F at night
- Fallbrook in October83°F by day, 58°F at night
- Fallbrook 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