Click on a day for an hourly weather forecast
The temperatures in Hayward in September are comfortable with low of 15°C and and high up to 28°C.
You can expect up to 3 rainy days in Hayward during the month of September.
Our weather forecast can give you a great sense of what weather to expect in Hayward in September 2025.
If you’re planning to visit Hayward in the near future, we highly recommend that you review the 14 day weather forecast for Hayward before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 16° / 7° | 4 | 27 | 0 | 36 mm | Good | Hayward in January |
| February | 17° / 7° | 3 | 25 | 0 | 36 mm | Good | Hayward in February |
| March | 18° / 7° | 3 | 28 | 0 | 39 mm | Good | Hayward in March |
| April | 20° / 8° | 2 | 28 | 0 | 17 mm | Good | Hayward in April |
| May | 22° / 10° | 1 | 30 | 0 | 8 mm | Good | Hayward in May |
| June | 26° / 13° | 1 | 29 | 0 | 4 mm | Perfect | Hayward in June |
| July | 28° / 14° | 0 | 31 | 0 | 1 mm | Perfect | Hayward in July |
| August | 28° / 15° | 0 | 31 | 0 | 1 mm | Perfect | Hayward in August |
| September | 28° / 15° | 0 | 30 | 0 | 3 mm | Perfect | Hayward in September |
| October | 24° / 13° | 1 | 30 | 0 | 16 mm | Perfect | Hayward in October |
| November | 19° / 10° | 2 | 28 | 0 | 23 mm | Good | Hayward in November |
| December | 15° / 7° | 4 | 27 | 0 | 34 mm | Good | Hayward in December |