Santa Monica weather in September: Santa Monica, California: normal highs, lows, rain and records for September
Santa Monica in September has a normal high of 76°F and a normal low of 62°F, a daily mean of 69°F, falling from 77°F on the 1st to 75°F by the 30th. Measurable precipitation falls on 1 days in a normal September, 0.14 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 17°C, 4 mm of precipitation in September.
- NOAA stationSanta Monica Municipal Airport
- Station IDUSW00093197
- Location34.02°N 118.45°W
- Elevation174 ft (53 m)
- From the center3 miles
- Population90,729
- Jan 66° 49°
- Feb 66° 49°
- Mar 66° 51°
- Apr 68° 53°
- May 69° 57°
- Jun 71° 60°
- Jul 75° 63°
- Aug 77° 63°
- Sep 76° 62°
- Oct 74° 58°
- Nov 70° 52°
- Dec 66° 48°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Santa Monica in September?
The normal high is 76°F and the normal low 62°F, for a daily mean of 69.2°F. September is 0.6°F cooler than August and 3.1°F warmer than October. September is the 2nd warmest month of the year in Santa Monica and the 9th wettest. Across the month the normal high falls 2°F, from 77°F on September 1 to 75°F on September 30. From one year to the next September's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 67°F and 72°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 7%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 77°F | 63°F | 2% | 0% |
| September 8 | 77°F | 63°F | 3% | 1% |
| September 15 | 76°F | 63°F | 3% | 1% |
| September 22 | 76°F | 62°F | 5% | 1% |
| September 30 | 75°F | 61°F | 7% | 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 | 77°F | 63°F | 2% | 0% | 12 h 50 min |
| September 2 | 77°F | 63°F | 2% | 0% | 12 h 50 min |
| September 3 | 77°F | 63°F | 2% | 0% | 12 h 50 min |
| September 4 | 77°F | 63°F | 2% | 1% | 12 h 50 min |
| September 5 | 77°F | 63°F | 2% | 1% | 12 h 50 min |
| September 6 | 77°F | 63°F | 2% | 1% | 12 h 40 min |
| September 7 | 77°F | 63°F | 2% | 1% | 12 h 40 min |
| September 8 | 77°F | 63°F | 3% | 1% | 12 h 40 min |
| September 9 | 77°F | 63°F | 3% | 1% | 12 h 40 min |
| September 10 | 77°F | 63°F | 3% | 1% | 12 h 40 min |
| September 11 | 77°F | 63°F | 3% | 1% | 12 h 30 min |
| September 12 | 76°F | 63°F | 3% | 1% | 12 h 30 min |
| September 13 | 76°F | 63°F | 3% | 1% | 12 h 30 min |
| September 14 | 76°F | 63°F | 3% | 1% | 12 h 30 min |
| September 15 | 76°F | 63°F | 3% | 1% | 12 h 30 min |
| September 16 | 76°F | 63°F | 4% | 1% | 12 h 20 min |
| September 17 | 76°F | 62°F | 4% | 1% | 12 h 20 min |
| September 18 | 76°F | 62°F | 4% | 1% | 12 h 20 min |
| September 19 | 76°F | 62°F | 4% | 1% | 12 h 20 min |
| September 20 | 76°F | 62°F | 4% | 1% | 12 h 20 min |
| September 21 | 76°F | 62°F | 5% | 1% | 12 h 10 min |
| September 22 | 76°F | 62°F | 5% | 1% | 12 h 10 min |
| September 23 | 76°F | 62°F | 5% | 2% | 12 h 10 min |
| September 24 | 76°F | 62°F | 5% | 2% | 12 h 10 min |
| September 25 | 76°F | 62°F | 6% | 2% | 12 h 10 min |
| September 26 | 75°F | 61°F | 6% | 2% | 12 h |
| September 27 | 75°F | 61°F | 6% | 2% | 12 h |
| September 28 | 75°F | 61°F | 6% | 2% | 12 h |
| September 29 | 75°F | 61°F | 7% | 2% | 12 h |
| September 30 | 75°F | 61°F | 7% | 2% | 11 h 50 min |
- Normal high
- 76°FSeptember average
- Normal low
- 62°FSeptember average
- Precipitation
- 0.14 inmonth total
- Days with precipitation
- 10.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 12 h 50 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 27
- Days at 80°F or more
- 8
- Sunshine
- 95%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093197; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Santa Monica in September?
On a given September day the chance of 0.01 inch or more is 4% on average, highest around September 30 (7%). In all, 0.14 in falls on 1 days of a normal September.
In a normal September in Santa Monica, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093197.
What are the records for September in Santa Monica?
The warmest September temperature on this station's record (since 1998) is 103°F, on September 27, 2010; the coldest is 51°F, on September 19, 2010. The wettest September brought 2.23 in (2015).
The September mean against the 1991-2020 normal of 69.2°F: 2021 67.3°F (−1.9), 2022 74.5°F (+5.3), 2023 68.8°F (−0.4), 2024 69.8°F (+0.6), 2025 71.0°F (+1.8), 2026 73.5°F (+4.3). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 67.3°F | −1.9°F | 0.00 in |
| 2022 | 74.5°F | +5.3°F | 0.33 in |
| 2023 | 68.8°F | −0.4°F | 0.06 in |
| 2024 | 69.8°F | +0.6°F | 0.00 in |
| 2025 | 71.0°F | +1.8°F | 0.12 in |
| 2026 | 73.5°F | +4.3°F | 1.09 in |
Source: records: ACIS, station USW00093197; recent months: ACIS, station USW00093197. Records and recent months use complete months only.
How does September in Santa Monica 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; Santa Monica's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Santa Monica in August77°F by day, 63°F at night
- Santa Monica in October74°F by day, 58°F at night
- Santa Monica 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