Chico, CA weather in September
In September, Chico sees highs around 90°F and lows around 58°F: hot and dry. Rain falls on about 1 day.
- Normal high
- 90°F
- Normal low
- 58°F
- Wet days
- 1
- 0.2 in total
- Muggy days
- 0
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 92°F | 86°F |
| Normal low | 60°F | 55°F |
| Chance of a wet day | 2% | 6% |
| Sunrise / sunset | 6:35 am / 7:39 pm | 7:02 am / 6:51 pm |
| Daylight | 13.1 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical September day
- 6 am61°Fdew point 45°F
- 9 am74°Fdew point 46°F
- Noon85°Fdew point 44°F
- 3 pm90°Fdew point 42°F
- 6 pm84°Fdew point 45°F
- 9 pm72°Fdew point 48°F
NOAA hourly normals (local standard time) from Red Bluff Muni Airport (37 mi away); average wind 7 mph; clear or few clouds in 92% of daytime hours, mostly cloudy or overcast in 6%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F4 of 30
- Hot dayshigh 90°F or more18 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow1 of 30
- Notable rainat least 0.10 in1 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 0.2 in; a dry September brings about 0.0 in and a wet one about 0.2 in (25th and 75th percentiles). Days with half an inch or more are rare.
How September varies from year to year
- Warmest September, 1991-20201991: average high 95°F
- Coolest September2007: average high 84°F
- Wettest September2013: 1.6 in
- Driest September1991: no measurable precipitation
- Highest reading113°F (September 2, 2017)
- Lowest reading39°F (September 24, 2000)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 93°F | 90°F | 80°F |
| Normal low | 61°F | 58°F | 51°F |
| Wet days | 0 | 1 | 4 |
| Comfortable days | 1 | 4 | 14 |
| Daylight | 13.7 h | 12.4 h | 11.2 h |
Highs change by -3°F from August and -10°F into October.
Nearby alternatives in September
- Cooler: Santa Rosa, CA101 mi · high 84°F · 2 wet days
How Chico ranks in September
- Normal high49th warmest of 378 cities; 20th of 60 in California
- Wet days40th driest of 378
- Comfortable days226th most of 342
What to pack for Chico in September
- Light, breathable clothing – highs near 90°F
- Layers – afternoons near 90°F but nights near 58°F
Heating and cooling
September has 6 heating degree days and 271 cooling degree days (base 65°F), 7% of the year's total heating and cooling demand.
Questions
How hot is Chico in September?
The normal high is 90°F and the normal low is 58°F. From 1991 to 2020 the hottest September reading was 113°F (September 2, 2017).
Does it rain a lot in Chico in September?
About 1 days in September have at least 0.01 in of precipitation, and the normal total is 0.2 in. The wettest September in 1991-2020 was in 2013 (1.6 in); the driest was in 1991, with no measurable precipitation.
Is September a good time to visit Chico?
September ranks 9th of 12 months on our comfort score for Chico (46 out of 100). It has about 4 comfortable days and about 18 days at 90°F or hotter. The best month is April.
Where the numbers come from
- Temperature, rain, snowfall and snow depth: Orland (USC00046506), 19 mi W of the city center, 254 ft (56 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Chico Univ Farm (USC00041715), 2.7 mi SSE of the city center, 185 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Red Bluff Muni Airport (USW00024216), 37 mi NW of the city center, 353 ft (155 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Red Bluff Municipal Arpt (725910-24216), 37 mi NW of the city center, 355 ft (157 ft higher than the city). Hourly observations, 1991-2020.