Temperature for September
In Red Bluff, CA during September the average high temperature is 92.8°F. The hottest day on record was September 5, 1988 when the temperature hit 118.0°F.
Precipitation for September
In September the average monthly rainfall in Red Bluff, CA is 0.64 inches with rain usually falling on between 2 and 3 days. 1988 was the driest September with only 0.00 inches of rain falling, and 1989 was the wettest September with 5.13 inches of rain. The wettest single day in September was 2 September 1974 when 3.07 inches of rain fell.
In September there have been some years when thunderstorms have occurred, although there are other years when there hasn't been a thunderstorm in September.