Stockton weather in September: Stockton, California: normal highs, lows, rain and records for September
Stockton in September has a normal high of 90°F and a normal low of 58°F, a daily mean of 74°F, falling from 93°F on the 1st to 87°F by the 30th. Measurable precipitation falls on 1 days in a normal September, 0.08 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 14°C, 2 mm of precipitation in September.
- NOAA stationStockton Metro Airport
- Station IDUSW00023237
- Location37.89°N 121.23°W
- Elevation26 ft (8 m)
- From the center8 miles
- Population324,975
- Jan 57° 39°
- Feb 63° 41°
- Mar 69° 44°
- Apr 75° 47°
- May 83° 53°
- Jun 90° 58°
- Jul 95° 61°
- Aug 94° 60°
- Sep 90° 58°
- Oct 80° 51°
- Nov 67° 43°
- Dec 57° 38°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Stockton in September?
The normal high is 90°F and the normal low 58°F, for a daily mean of 73.9°F. September is 3.4°F cooler than August and 8.4°F warmer than October. September is the 4th warmest month of the year in Stockton and the 10th wettest. Across the month the normal high falls 6°F, from 93°F on September 1 to 87°F on September 30. From one year to the next September's mean temperature typically moves about 1.6°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 72°F and 76°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 5%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 93°F | 59°F | 1% | 0% |
| September 8 | 92°F | 59°F | 2% | 1% |
| September 15 | 91°F | 58°F | 3% | 1% |
| September 22 | 89°F | 57°F | 4% | 2% |
| September 30 | 87°F | 55°F | 5% | 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 | 93°F | 59°F | 1% | 0% | 13 h |
| September 2 | 93°F | 59°F | 1% | 0% | 13 h |
| September 3 | 93°F | 59°F | 1% | 0% | 13 h |
| September 4 | 93°F | 59°F | 1% | 0% | 13 h |
| September 5 | 93°F | 59°F | 2% | 0% | 12 h 50 min |
| September 6 | 93°F | 59°F | 2% | 1% | 12 h 50 min |
| September 7 | 92°F | 59°F | 2% | 1% | 12 h 50 min |
| September 8 | 92°F | 59°F | 2% | 1% | 12 h 50 min |
| September 9 | 92°F | 59°F | 2% | 1% | 12 h 40 min |
| September 10 | 92°F | 59°F | 2% | 1% | 12 h 40 min |
| September 11 | 92°F | 58°F | 2% | 1% | 12 h 40 min |
| September 12 | 92°F | 58°F | 2% | 1% | 12 h 40 min |
| September 13 | 91°F | 58°F | 2% | 1% | 12 h 30 min |
| September 14 | 91°F | 58°F | 2% | 1% | 12 h 30 min |
| September 15 | 91°F | 58°F | 3% | 1% | 12 h 30 min |
| September 16 | 91°F | 58°F | 3% | 1% | 12 h 30 min |
| September 17 | 90°F | 58°F | 3% | 1% | 12 h 20 min |
| September 18 | 90°F | 57°F | 3% | 1% | 12 h 20 min |
| September 19 | 90°F | 57°F | 3% | 1% | 12 h 20 min |
| September 20 | 90°F | 57°F | 3% | 1% | 12 h 20 min |
| September 21 | 89°F | 57°F | 3% | 2% | 12 h 10 min |
| September 22 | 89°F | 57°F | 4% | 2% | 12 h 10 min |
| September 23 | 89°F | 56°F | 4% | 2% | 12 h 10 min |
| September 24 | 89°F | 56°F | 4% | 2% | 12 h 10 min |
| September 25 | 88°F | 56°F | 4% | 2% | 12 h 10 min |
| September 26 | 88°F | 56°F | 4% | 2% | 12 h |
| September 27 | 88°F | 56°F | 4% | 2% | 12 h |
| September 28 | 87°F | 55°F | 5% | 2% | 12 h |
| September 29 | 87°F | 55°F | 5% | 2% | 12 h |
| September 30 | 87°F | 55°F | 5% | 2% | 11 h 50 min |
- Normal high
- 90°FSeptember average
- Normal low
- 58°FSeptember average
- Precipitation
- 0.08 inmonth total
- Days with precipitation
- 10.01 inch or more
- Days at 90°F or more
- 16
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 27
- Sunshine
- 95%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023237; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Stockton in September?
On a given September day the chance of 0.01 inch or more is 3% on average, highest around September 30 (5%). In all, 0.08 in falls on 1 days of a normal September.
In a normal September in Stockton, 16 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023237.
How humid and windy is Stockton in September?
At 3 p.m. the normal temperature is 84°F with 27% relative humidity and a dew point of 47°F; at 6 a.m. it is 56°F with 76% humidity. The wind averages 6.7 mph, most often from the west-northwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 56°F | 48°F | 76% | 4.0 mph | 93% |
| 9 a.m. | 69°F | 50°F | 52% | 6.2 mph | 91% |
| noon | 80°F | 49°F | 34% | 7.5 mph | 92% |
| 3 p.m. | 84°F | 47°F | 27% | 8.9 mph | 94% |
| 6 p.m. | 77°F | 48°F | 36% | 9.1 mph | 95% |
| 9 p.m. | 67°F | 49°F | 53% | 8.0 mph | 95% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00023237. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Stockton?
The warmest September temperature on Stockton's official record (since 1893) is 115°F, on September 6, 2022; the coldest is 39°F, on September 27, 1948. The wettest September brought 3.68 in (1918).
The September mean against the 1991-2020 normal of 73.9°F: 2021 72.4°F (−1.5), 2022 77.9°F (+4.0), 2023 71.9°F (−2.0), 2024 75.4°F (+1.5), 2025 75.3°F (+1.3), 2026 72.1°F (−1.8). 3 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 72.4°F | −1.5°F | 0.01 in |
| 2022 | 77.9°F | +4.0°F | 0.06 in |
| 2023 | 71.9°F | −2.0°F | 0.02 in |
| 2024 | 75.4°F | +1.5°F | 0.00 in |
| 2025 | 75.3°F | +1.3°F | 0.04 in |
| 2026 | 72.1°F | −1.8°F | 0.00 in |
Source: records: ACIS, NWS threaded record SCKthr; recent months: ACIS, station USW00023237. Records and recent months use complete months only.
How does September in Stockton 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; Stockton's is 90°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.