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The weather in Pleasanton in September is hot. The average temperatures are between 15°C and 30°C. Usually the days in September are hot while the nights are a bit cooler.
You can expect up to 3 rainy days in Pleasanton during the month of September.
Our weather forecast can give you a great sense of what weather to expect in Pleasanton in September 2025.
If you’re planning to visit Pleasanton in the near future, we highly recommend that you review the 14 day weather forecast for Pleasanton before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 15° / 6° | 5 | 26 | 0 | 102 mm | Good | Pleasanton in January |
| February | 16° / 6° | 4 | 24 | 0 | 91 mm | Good | Pleasanton in February |
| March | 18° / 7° | 5 | 26 | 0 | 95 mm | Good | Pleasanton in March |
| April | 20° / 8° | 2 | 28 | 0 | 40 mm | Good | Pleasanton in April |
| May | 23° / 10° | 2 | 30 | 0 | 19 mm | Perfect | Pleasanton in May |
| June | 28° / 13° | 1 | 29 | 0 | 7 mm | Perfect | Pleasanton in June |
| July | 30° / 14° | 0 | 31 | 0 | 4 mm | Good | Pleasanton in July |
| August | 30° / 15° | 0 | 31 | 0 | 2 mm | Good | Pleasanton in August |
| September | 30° / 15° | 0 | 30 | 0 | 7 mm | Good | Pleasanton in September |
| October | 25° / 13° | 2 | 29 | 0 | 33 mm | Perfect | Pleasanton in October |
| November | 19° / 9° | 3 | 27 | 0 | 58 mm | Good | Pleasanton in November |
| December | 14° / 7° | 5 | 26 | 0 | 84 mm | Good | Pleasanton in December |