Watsonville weather in September: Watsonville, California: normal highs, lows, rain and records for September
Watsonville in September has a normal high of 75°F and a normal low of 52°F, a daily mean of 64°F, holding near 75°F all month. Measurable precipitation falls on 2 days in a normal September, 0.07 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 11°C, 2 mm of precipitation in September.
- NOAA stationWatsonville Municipal Airport
- Station IDUSW00023277
- Location36.94°N 121.79°W
- Elevation160 ft (49 m)
- From the center1 miles
- Population51,320
- Jan 61° 40°
- Feb 62° 42°
- Mar 64° 43°
- Apr 66° 45°
- May 69° 48°
- Jun 72° 50°
- Jul 72° 53°
- Aug 73° 53°
- Sep 75° 52°
- Oct 74° 48°
- Nov 67° 43°
- Dec 61° 39°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Watsonville in September?
The normal high is 75°F and the normal low 52°F, for a daily mean of 63.6°F. September is 0.3°F warmer than August and 2.7°F warmer than October. September is the warmest month of the year in Watsonville and the 10th wettest. From one year to the next September's mean temperature typically moves about 2.2°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 61°F and 66°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 | 75°F | 53°F | 6% | 0% |
| September 8 | 75°F | 53°F | 6% | 1% |
| September 15 | 76°F | 52°F | 7% | 1% |
| September 22 | 75°F | 51°F | 8% | 1% |
| September 30 | 75°F | 50°F | 9% | 2% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 15, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 75°F | 53°F | 6% | 0% | 13 h |
| September 2 | 75°F | 53°F | 6% | 0% | 13 h |
| September 3 | 75°F | 53°F | 6% | 0% | 13 h |
| September 4 | 75°F | 53°F | 6% | 0% | 12 h 50 min |
| September 5 | 75°F | 53°F | 6% | 0% | 12 h 50 min |
| September 6 | 75°F | 53°F | 6% | 0% | 12 h 50 min |
| September 7 | 75°F | 53°F | 6% | 0% | 12 h 50 min |
| September 8 | 75°F | 53°F | 6% | 1% | 12 h 40 min |
| September 9 | 75°F | 53°F | 7% | 1% | 12 h 40 min |
| September 10 | 75°F | 52°F | 7% | 1% | 12 h 40 min |
| September 11 | 75°F | 52°F | 7% | 1% | 12 h 40 min |
| September 12 | 75°F | 52°F | 7% | 1% | 12 h 40 min |
| September 13 | 75°F | 52°F | 7% | 1% | 12 h 30 min |
| September 14 | 75°F | 52°F | 7% | 1% | 12 h 30 min |
| September 15 | 76°F | 52°F | 7% | 1% | 12 h 30 min |
| September 16 | 76°F | 52°F | 7% | 1% | 12 h 30 min |
| September 17 | 76°F | 52°F | 7% | 1% | 12 h 20 min |
| September 18 | 76°F | 52°F | 7% | 1% | 12 h 20 min |
| September 19 | 76°F | 52°F | 8% | 1% | 12 h 20 min |
| September 20 | 76°F | 51°F | 8% | 1% | 12 h 20 min |
| September 21 | 76°F | 51°F | 8% | 1% | 12 h 10 min |
| September 22 | 75°F | 51°F | 8% | 1% | 12 h 10 min |
| September 23 | 75°F | 51°F | 8% | 1% | 12 h 10 min |
| September 24 | 75°F | 51°F | 8% | 2% | 12 h 10 min |
| September 25 | 75°F | 51°F | 8% | 2% | 12 h 10 min |
| September 26 | 75°F | 51°F | 8% | 2% | 12 h |
| September 27 | 75°F | 51°F | 8% | 2% | 12 h |
| September 28 | 75°F | 51°F | 9% | 2% | 12 h |
| September 29 | 75°F | 50°F | 9% | 2% | 12 h |
| September 30 | 75°F | 50°F | 9% | 2% | 11 h 50 min |
- Normal high
- 75°FSeptember average
- Normal low
- 52°FSeptember average
- Precipitation
- 0.07 inmonth total
- Days with precipitation
- 20.01 inch or more
- Days at 90°F or more
- 3
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 22
- Days at 80°F or more
- 8
- Sunshine
- 91%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023277; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Watsonville in September?
On a given September day the chance of 0.01 inch or more is 7% on average, highest around September 30 (9%). In all, 0.07 in falls on 2 days of a normal September.
In a normal September in Watsonville, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023277.
What are the records for September in Watsonville?
The warmest September temperature on this station's record (since 1945) is 110°F, on September 2, 2017; the coldest is 43°F, on September 23, 1945. The wettest September brought 1.90 in (2022).
The September mean against the 1991-2020 normal of 63.6°F: 2021 63.8°F (+0.2), 2022 66.1°F (+2.5), 2023 62.6°F (−1.0), 2024 64.5°F (+0.9), 2025 66.5°F (+2.9), 2026 64.3°F (+0.7). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.8°F | +0.2°F | 0.00 in |
| 2022 | 66.1°F | +2.5°F | 1.90 in |
| 2023 | 62.6°F | −1.0°F | 0.09 in |
| 2024 | 64.5°F | +0.9°F | 0.00 in |
| 2025 | 66.5°F | +2.9°F | 0.10 in |
| 2026 | 64.3°F | +0.7°F | 0.05 in |
Source: records: ACIS, station USW00023277; recent months: ACIS, station USW00023277. Records and recent months use complete months only.
How does September in Watsonville 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; Watsonville's is 75°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Watsonville in August73°F by day, 53°F at night
- Watsonville in October74°F by day, 48°F at night
- Watsonville 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