Click on a day for an hourly weather forecast
The weather in Pasadena in September is very hot. The average temperatures are between 25°C and 30°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Pasadena. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Pasadena in September 2025.
If you’re planning to visit Pasadena in the near future, we highly recommend that you review the 14 day weather forecast for Pasadena before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 16° / 10° | 4 | 27 | 0 | 52 mm | Good | Pasadena in January |
| February | 17° / 11° | 4 | 24 | 0 | 43 mm | Good | Pasadena in February |
| March | 21° / 15° | 4 | 27 | 0 | 41 mm | Good | Pasadena in March |
| April | 25° / 18° | 3 | 27 | 0 | 51 mm | Perfect | Pasadena in April |
| May | 28° / 22° | 6 | 25 | 0 | 83 mm | Perfect | Pasadena in May |
| June | 31° / 25° | 8 | 22 | 0 | 118 mm | Ok | Pasadena in June |
| July | 32° / 26° | 11 | 20 | 0 | 143 mm | Ok | Pasadena in July |
| August | 33° / 26° | 12 | 19 | 0 | 176 mm | Ok | Pasadena in August |
| September | 30° / 25° | 11 | 19 | 0 | 188 mm | Ok | Pasadena in September |
| October | 27° / 20° | 5 | 26 | 0 | 80 mm | Perfect | Pasadena in October |
| November | 21° / 15° | 3 | 27 | 0 | 57 mm | Good | Pasadena in November |
| December | 18° / 12° | 4 | 27 | 0 | 49 mm | Good | Pasadena in December |