Climate averages 1991–2020
Fresno weather
in September.
A hot, very dry month: the 4th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Fresno: daytime highs average 32.6°C and nights cool to about 18.2°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 1.8 mm of rain on fewer than one day, which makes September a very dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 27 min on an average September day.
The nearest other city in this atlas is Clovis (11 km away). In September its highs average 32.5°C, about as warm as Fresno, with 1.8 mm of rain.
Among the 498 cities listed in the United States, Fresno ranks joint 21st of 498 for the warmest September highs and joint 17th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Fresno is 5.7°C warmer than that mean.
From September to October, average highs fall by 6.4°C to 26.2°C, and monthly rainfall rises from 1.8 mm to 22 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Fresno climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 14.5°C4.2°C | 4.2°C | 89 | 7.5 | 10.010 h |
| February | 16.4°C5.6°C | 5.6°C | 75 | 8.1 | 10.811 h |
| March | 19.4°C7.8°C | 7.8°C | 74 | 7.3 | 11.912 h |
| April | 23.0°C10.2°C | 10.2°C | 35 | 4.4 | 13.113 h |
| May | 28.2°C14.1°C | 14.1°C | 17 | 2.7 | 14.114 h |
| June | 33.3°C18.1°C | 18.1°C | 4.8 | 0.6 | 14.615 h |
| July | 36.6°C21.6°C | 21.6°C | 1.5 | 0.2 | 14.414 h |
| August | 35.9°C21.0°C | 21.0°C | 0.4 | 0.2 | 13.614 h |
| September, selected | 32.6°C18.2°C | 18.2°C | 1.8 | 0.5 | 12.512 h |
| October | 26.2°C13.2°C | 13.2°C | 22 | 2.1 | 11.311 h |
| November | 19.0°C7.9°C | 7.9°C | 36 | 4.3 | 10.210 h |
| December | 14.2°C4.3°C | 4.3°C | 71 | 6.9 | 9.710 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Clovis in SeptemberUnited States · 11 kmHigh 32.5°C · Low 17.6°C · 1.8 mm rain
- Visalia in SeptemberUnited States · 63 kmHigh 32.8°C · Low 18.5°C · 1.7 mm rain
- Merced in SeptemberUnited States · 88 kmHigh 32.2°C · Low 17.3°C · 1.7 mm rain
- Turlock in SeptemberUnited States · 126 kmHigh 31.8°C · Low 17.1°C · 1.9 mm rain
- Modesto in SeptemberUnited States · 147 kmHigh 31.3°C · Low 16.3°C · 1.9 mm rain
- Bakersfield in SeptemberUnited States · 167 kmHigh 31.8°C · Low 17.9°C · 1.0 mm rain
- Salinas in SeptemberUnited States · 168 kmHigh 23.6°C · Low 13.3°C · 2.1 mm rain
- Manteca in SeptemberUnited States · 173 kmHigh 30.3°C · Low 15.3°C · 1.9 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Fresno) is explained once on the Fresno year overview and on the Sources, method and limits page.
Clovis lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.