San Rafael weather in September: San Rafael, California: normal highs, lows, rain and records for September
San Rafael in September has a normal high of 81°F and a normal low of 54°F, a daily mean of 68°F, falling from 82°F on the 1st to 79°F by the 30th. Measurable precipitation falls on 1 days in a normal September, 0.07 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 12°C, 2 mm of precipitation in September.
- NOAA stationSan Rafael Civic Center
- Station IDUSC00047880
- Location38.00°N 122.54°W
- Elevation120 ft (37 m)
- From the center2 miles
- Population59,961
- Jan 57° 43°
- Feb 61° 44°
- Mar 65° 46°
- Apr 68° 48°
- May 72° 51°
- Jun 78° 54°
- Jul 81° 55°
- Aug 81° 56°
- Sep 81° 54°
- Oct 75° 51°
- Nov 65° 46°
- Dec 57° 42°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Rafael in September?
The normal high is 81°F and the normal low 54°F, for a daily mean of 67.6°F. September is 0.8°F cooler than August and 4.4°F warmer than October. September is the 3rd warmest month of the year in San Rafael and the 10th wettest. Across the month the normal high falls 3°F, from 82°F on September 1 to 79°F on September 30. From one year to the next September's mean temperature typically moves about 1.9°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 66°F and 70°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 6%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 82°F | 55°F | 1% | 1% |
| September 8 | 82°F | 55°F | 2% | 1% |
| September 15 | 81°F | 55°F | 3% | 1% |
| September 22 | 80°F | 54°F | 5% | 2% |
| September 30 | 79°F | 53°F | 6% | 3% |
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 | 82°F | 55°F | 1% | 1% | 13 h |
| September 2 | 82°F | 55°F | 2% | 1% | 13 h |
| September 3 | 82°F | 55°F | 2% | 1% | 13 h |
| September 4 | 82°F | 55°F | 2% | 1% | 13 h |
| September 5 | 82°F | 55°F | 2% | 1% | 12 h 50 min |
| September 6 | 82°F | 55°F | 2% | 1% | 12 h 50 min |
| September 7 | 82°F | 55°F | 2% | 1% | 12 h 50 min |
| September 8 | 82°F | 55°F | 2% | 1% | 12 h 50 min |
| September 9 | 81°F | 55°F | 2% | 1% | 12 h 40 min |
| September 10 | 81°F | 55°F | 2% | 1% | 12 h 40 min |
| September 11 | 81°F | 55°F | 3% | 1% | 12 h 40 min |
| September 12 | 81°F | 55°F | 3% | 1% | 12 h 40 min |
| September 13 | 81°F | 55°F | 3% | 1% | 12 h 30 min |
| September 14 | 81°F | 55°F | 3% | 1% | 12 h 30 min |
| September 15 | 81°F | 55°F | 3% | 1% | 12 h 30 min |
| September 16 | 81°F | 54°F | 3% | 1% | 12 h 30 min |
| September 17 | 81°F | 54°F | 4% | 1% | 12 h 20 min |
| September 18 | 81°F | 54°F | 4% | 1% | 12 h 20 min |
| September 19 | 81°F | 54°F | 4% | 2% | 12 h 20 min |
| September 20 | 81°F | 54°F | 4% | 2% | 12 h 20 min |
| September 21 | 80°F | 54°F | 4% | 2% | 12 h 10 min |
| September 22 | 80°F | 54°F | 5% | 2% | 12 h 10 min |
| September 23 | 80°F | 54°F | 5% | 2% | 12 h 10 min |
| September 24 | 80°F | 54°F | 5% | 2% | 12 h 10 min |
| September 25 | 80°F | 54°F | 5% | 2% | 12 h 10 min |
| September 26 | 80°F | 54°F | 5% | 2% | 12 h |
| September 27 | 79°F | 54°F | 6% | 3% | 12 h |
| September 28 | 79°F | 54°F | 6% | 3% | 12 h |
| September 29 | 79°F | 54°F | 6% | 3% | 12 h |
| September 30 | 79°F | 53°F | 6% | 3% | 11 h 50 min |
- Normal high
- 81°FSeptember average
- Normal low
- 54°FSeptember average
- Precipitation
- 0.07 inmonth total
- Days with precipitation
- 10.01 inch or more
- Days at 90°F or more
- 5
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 27
- Days at 80°F or more
- 13
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00047880; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in San Rafael in September?
On a given September day the chance of 0.01 inch or more is 3% on average, highest around September 30 (6%). In all, 0.07 in falls on 1 days of a normal September.
In a normal September in San Rafael, 5 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00047880.
What are the records for September in San Rafael?
The warmest September temperature on this station's record (since 1894) is 110°F, on September 7, 1904; the coldest is 32°F, on September 30, 1894. The wettest September brought 6.12 in (1904).
The September mean against the 1991-2020 normal of 67.6°F: 2021 68.5°F (+0.9), 2023 66.7°F (−0.9), 2024 68.5°F (+0.9), 2025 70.6°F (+3.0), 2026 68.8°F (+1.2). 4 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 68.5°F | +0.9°F | 0.00 in |
| 2023 | 66.7°F | −0.9°F | 0.04 in |
| 2024 | 68.5°F | +0.9°F | 0.00 in |
| 2025 | 70.6°F | +3.0°F | 0.08 in |
| 2026 | 68.8°F | +1.2°F | 0.08 in |
Source: records: ACIS, station USC00047880; recent months: ACIS, station USC00047880. Records and recent months use complete months only.
How does September in San Rafael 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; San Rafael's is 81°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- San Rafael in August81°F by day, 56°F at night
- San Rafael in October75°F by day, 51°F at night
- San Rafael 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