Click on a day for an hourly weather forecast
The temperatures in Chico in September are comfortable with low of 14°C and and high up to 33°C.
There is little to no rain in Chico during September, so it’s a lot easier to explore the city. Just remember to dress in warm layers, as it can still get pretty chilly.
Our weather forecast can give you a great sense of what weather to expect in Chico in September 2025.
If you’re planning to visit Chico in the near future, we highly recommend that you review the 14 day weather forecast for Chico before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 14° / 5° | 6 | 25 | 0 | 181 mm | Good | Chico in January |
| February | 15° / 4° | 6 | 22 | 0 | 183 mm | Good | Chico in February |
| March | 17° / 5° | 9 | 22 | 0 | 207 mm | Ok | Chico in March |
| April | 21° / 7° | 4 | 26 | 0 | 79 mm | Good | Chico in April |
| May | 26° / 10° | 3 | 28 | 0 | 54 mm | Perfect | Chico in May |
| June | 32° / 15° | 1 | 29 | 0 | 19 mm | Good | Chico in June |
| July | 37° / 17° | 0 | 31 | 0 | 5 mm | Ok | Chico in July |
| August | 35° / 16° | 0 | 31 | 0 | 7 mm | Ok | Chico in August |
| September | 33° / 14° | 0 | 30 | 0 | 14 mm | Good | Chico in September |
| October | 25° / 11° | 3 | 28 | 0 | 71 mm | Perfect | Chico in October |
| November | 18° / 7° | 4 | 26 | 0 | 117 mm | Good | Chico in November |
| December | 13° / 4° | 7 | 24 | 0 | 170 mm | Bad | Chico in December |