Hayward weather in September: Hayward, California: normal highs, lows, rain and records for September
Hayward in September has a normal high of 77°F and a normal low of 58°F, a daily mean of 67°F, falling from 78°F on the 1st to 76°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 25°C and low of 14°C, 2 mm of precipitation in September.
- NOAA stationHayward Air Terminal
- Station IDUSW00093228
- Location37.65°N 122.11°W
- Elevation43 ft (13 m)
- From the center2 miles
- Population158,440
- Jan 59° 43°
- Feb 62° 45°
- Mar 64° 47°
- Apr 67° 50°
- May 69° 52°
- Jun 74° 55°
- Jul 75° 57°
- Aug 76° 58°
- Sep 77° 58°
- Oct 74° 54°
- Nov 65° 47°
- Dec 59° 43°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Hayward in September?
The normal high is 77°F and the normal low 58°F, for a daily mean of 67.3°F. September is 0.0°F warmer than August and 3.8°F warmer than October. September is the warmest month of the year in Hayward and the 11th wettest. Across the month the normal high falls 2°F, from 78°F on September 1 to 76°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 65°F and 69°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 | 78°F | 58°F | 2% | 1% |
| September 8 | 78°F | 58°F | 2% | 1% |
| September 15 | 77°F | 58°F | 3% | 1% |
| September 22 | 77°F | 57°F | 4% | 2% |
| September 30 | 76°F | 56°F | 5% | 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 | 78°F | 58°F | 2% | 1% | 13 h |
| September 2 | 78°F | 58°F | 2% | 1% | 13 h |
| September 3 | 78°F | 58°F | 2% | 1% | 13 h |
| September 4 | 78°F | 58°F | 2% | 1% | 13 h |
| September 5 | 78°F | 58°F | 2% | 1% | 12 h 50 min |
| September 6 | 78°F | 58°F | 2% | 1% | 12 h 50 min |
| September 7 | 78°F | 58°F | 2% | 1% | 12 h 50 min |
| September 8 | 78°F | 58°F | 2% | 1% | 12 h 50 min |
| September 9 | 78°F | 58°F | 2% | 1% | 12 h 40 min |
| September 10 | 77°F | 58°F | 2% | 1% | 12 h 40 min |
| September 11 | 77°F | 58°F | 3% | 1% | 12 h 40 min |
| September 12 | 77°F | 58°F | 3% | 1% | 12 h 40 min |
| September 13 | 77°F | 58°F | 3% | 1% | 12 h 30 min |
| September 14 | 77°F | 58°F | 3% | 1% | 12 h 30 min |
| September 15 | 77°F | 58°F | 3% | 1% | 12 h 30 min |
| September 16 | 77°F | 58°F | 3% | 1% | 12 h 30 min |
| September 17 | 77°F | 58°F | 3% | 2% | 12 h 20 min |
| September 18 | 77°F | 58°F | 4% | 2% | 12 h 20 min |
| September 19 | 77°F | 58°F | 4% | 2% | 12 h 20 min |
| September 20 | 77°F | 57°F | 4% | 2% | 12 h 20 min |
| September 21 | 77°F | 57°F | 4% | 2% | 12 h 10 min |
| September 22 | 77°F | 57°F | 4% | 2% | 12 h 10 min |
| September 23 | 77°F | 57°F | 4% | 2% | 12 h 10 min |
| September 24 | 77°F | 57°F | 4% | 2% | 12 h 10 min |
| September 25 | 76°F | 57°F | 5% | 2% | 12 h 10 min |
| September 26 | 76°F | 57°F | 5% | 2% | 12 h |
| September 27 | 76°F | 57°F | 5% | 2% | 12 h |
| September 28 | 76°F | 57°F | 5% | 3% | 12 h |
| September 29 | 76°F | 56°F | 5% | 3% | 12 h |
| September 30 | 76°F | 56°F | 5% | 3% | 11 h 50 min |
- Normal high
- 77°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
- 3
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 23
- Days at 80°F or more
- 8
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093228; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Hayward 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 Hayward, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093228.
What are the records for September in Hayward?
The warmest September temperature on this station's record (since 1998) is 108°F, on September 2, 2017; the coldest is 47°F, on September 29, 2007. The wettest September brought 0.47 in (2009).
The September mean against the 1991-2020 normal of 67.3°F: 2021 66.8°F (−0.5), 2022 70.2°F (+2.9), 2023 67.2°F (−0.1), 2024 69.1°F (+1.8), 2025 68.8°F (+1.5), 2026 66.8°F (−0.5). 3 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 66.8°F | −0.5°F | 0.01 in |
| 2022 | 70.2°F | +2.9°F | 0.23 in |
| 2023 | 67.2°F | −0.1°F | 0.07 in |
| 2024 | 69.1°F | +1.8°F | 0.00 in |
| 2025 | 68.8°F | +1.5°F | 0.12 in |
| 2026 | 66.8°F | −0.5°F | 0.12 in |
Source: records: ACIS, station USW00093228; recent months: ACIS, station USW00093228. Records and recent months use complete months only.
How does September in Hayward 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; Hayward's is 77°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.