Click on a day for an hourly weather forecast
The temperatures in Redwood City in September are comfortable with low of 15°C and and high up to 24°C.
You can expect up to 3 rainy days in Redwood City during the month of September.
Our weather forecast can give you a great sense of what weather to expect in Redwood City in September 2025.
If you’re planning to visit Redwood City in the near future, we highly recommend that you review the 14 day weather forecast for Redwood City before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 15° / 9° | 4 | 27 | 0 | 101 mm | Good | Redwood City in January |
| February | 15° / 9° | 4 | 24 | 0 | 97 mm | Good | Redwood City in February |
| March | 16° / 9° | 5 | 26 | 0 | 102 mm | Good | Redwood City in March |
| April | 18° / 9° | 2 | 28 | 0 | 39 mm | Good | Redwood City in April |
| May | 19° / 11° | 1 | 30 | 0 | 20 mm | Good | Redwood City in May |
| June | 22° / 13° | 0 | 30 | 0 | 7 mm | Good | Redwood City in June |
| July | 23° / 14° | 0 | 31 | 0 | 3 mm | Perfect | Redwood City in July |
| August | 24° / 15° | 0 | 31 | 0 | 2 mm | Perfect | Redwood City in August |
| September | 24° / 15° | 0 | 30 | 0 | 5 mm | Perfect | Redwood City in September |
| October | 21° / 14° | 2 | 30 | 0 | 35 mm | Good | Redwood City in October |
| November | 17° / 11° | 3 | 27 | 0 | 61 mm | Good | Redwood City in November |
| December | 14° / 9° | 5 | 26 | 0 | 92 mm | Good | Redwood City in December |