Richmond weather in September: Richmond, California: normal highs, lows, rain and records for September
Richmond in September has a normal high of 75°F and a normal low of 56°F, a daily mean of 65°F, holding near 75°F all month. Measurable precipitation falls on 0 days in a normal September, 0.03 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 13°C, 1 mm of precipitation in September.
- NOAA stationRichmond
- Station IDUSC00047414
- Location37.92°N 122.38°W
- Elevation20 ft (6 m)
- Population115,353
- Jan 58° 44°
- Feb 61° 46°
- Mar 64° 47°
- Apr 67° 49°
- May 69° 52°
- Jun 72° 54°
- Jul 71° 55°
- Aug 72° 56°
- Sep 75° 56°
- Oct 73° 54°
- Nov 65° 49°
- Dec 58° 44°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Richmond in September?
The normal high is 75°F and the normal low 56°F, for a daily mean of 65.4°F. September is 1.4°F warmer than August and 2.1°F warmer than October. September is the warmest month of the year in Richmond and the 11th wettest. Across the month the normal high rises 1°F, from 74°F on September 1 to 75°F on September 30. From one year to the next September's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 63°F and 68°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 4%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 74°F | 56°F | 1% | 0% |
| September 8 | 75°F | 56°F | 1% | 0% |
| September 15 | 75°F | 56°F | 2% | 0% |
| September 22 | 75°F | 56°F | 2% | 1% |
| September 30 | 75°F | 56°F | 4% | 2% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 16, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 74°F | 56°F | 1% | 0% | 13 h |
| September 2 | 74°F | 56°F | 1% | 0% | 13 h |
| September 3 | 74°F | 56°F | 1% | 0% | 13 h |
| September 4 | 74°F | 56°F | 1% | 0% | 13 h |
| September 5 | 74°F | 56°F | 1% | 0% | 12 h 50 min |
| September 6 | 75°F | 56°F | 1% | 0% | 12 h 50 min |
| September 7 | 75°F | 56°F | 1% | 0% | 12 h 50 min |
| September 8 | 75°F | 56°F | 1% | 0% | 12 h 50 min |
| September 9 | 75°F | 56°F | 1% | 0% | 12 h 40 min |
| September 10 | 75°F | 56°F | 1% | 0% | 12 h 40 min |
| September 11 | 75°F | 56°F | 1% | 0% | 12 h 40 min |
| September 12 | 75°F | 56°F | 1% | 0% | 12 h 40 min |
| September 13 | 75°F | 56°F | 1% | 0% | 12 h 30 min |
| September 14 | 75°F | 56°F | 2% | 0% | 12 h 30 min |
| September 15 | 75°F | 56°F | 2% | 0% | 12 h 30 min |
| September 16 | 75°F | 56°F | 2% | 1% | 12 h 30 min |
| September 17 | 75°F | 56°F | 2% | 1% | 12 h 20 min |
| September 18 | 75°F | 56°F | 2% | 1% | 12 h 20 min |
| September 19 | 75°F | 56°F | 2% | 1% | 12 h 20 min |
| September 20 | 75°F | 56°F | 2% | 1% | 12 h 20 min |
| September 21 | 75°F | 56°F | 2% | 1% | 12 h 10 min |
| September 22 | 75°F | 56°F | 2% | 1% | 12 h 10 min |
| September 23 | 75°F | 56°F | 3% | 1% | 12 h 10 min |
| September 24 | 75°F | 56°F | 3% | 1% | 12 h 10 min |
| September 25 | 75°F | 56°F | 3% | 1% | 12 h 10 min |
| September 26 | 75°F | 56°F | 3% | 1% | 12 h |
| September 27 | 75°F | 56°F | 3% | 1% | 12 h |
| September 28 | 75°F | 56°F | 3% | 1% | 12 h |
| September 29 | 75°F | 56°F | 3% | 2% | 12 h |
| September 30 | 75°F | 56°F | 4% | 2% | 11 h 50 min |
- Normal high
- 75°FSeptember average
- Normal low
- 56°FSeptember average
- Precipitation
- 0.03 inmonth total
- Days with precipitation
- fewer than 10.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 21
- Days at 80°F or more
- 8
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00047414; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Richmond in September?
On a given September day the chance of 0.01 inch or more is 2% on average, highest around September 30 (4%). In all, 0.03 in falls on 0 days of a normal September.
In a normal September in Richmond, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00047414.
What are the records for September in Richmond?
The warmest September temperature on this station's record (since 1950) is 107°F, on September 15, 1971; the coldest is 43°F, on September 30, 1983. The wettest September brought 2.74 in (1959).
Source: records: ACIS, station USC00047414. Records and recent months use complete months only.
How does September in Richmond 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; Richmond's is 75°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.