Click on a day for an hourly weather forecast
The temperatures in Sunnyvale in October are comfortable with low of 13°C and and high up to 24°C.
The wather in Sunnyvale in October can vary between cold and nice weather days. Expect a few rainy days but usually not more than 3.
Our weather forecast can give you a great sense of what weather to expect in Sunnyvale in October 2025.
If you’re planning to visit Sunnyvale in the near future, we highly recommend that you review the 14 day weather forecast for Sunnyvale before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 16° / 7° | 5 | 27 | 0 | 107 mm | Good | Sunnyvale in January |
| February | 16° / 7° | 4 | 24 | 0 | 94 mm | Good | Sunnyvale in February |
| March | 17° / 7° | 5 | 26 | 0 | 92 mm | Good | Sunnyvale in March |
| April | 20° / 8° | 2 | 28 | 0 | 40 mm | Good | Sunnyvale in April |
| May | 22° / 10° | 1 | 30 | 0 | 17 mm | Good | Sunnyvale in May |
| June | 26° / 13° | 0 | 30 | 0 | 6 mm | Perfect | Sunnyvale in June |
| July | 28° / 14° | 0 | 31 | 0 | 3 mm | Perfect | Sunnyvale in July |
| August | 28° / 15° | 0 | 31 | 0 | 2 mm | Perfect | Sunnyvale in August |
| September | 28° / 15° | 0 | 30 | 0 | 6 mm | Perfect | Sunnyvale in September |
| October | 24° / 13° | 1 | 30 | 0 | 30 mm | Perfect | Sunnyvale in October |
| November | 19° / 10° | 3 | 27 | 0 | 58 mm | Good | Sunnyvale in November |
| December | 15° / 7° | 5 | 26 | 0 | 90 mm | Good | Sunnyvale in December |