September weather forecastRed Bluff, CA
September
Weather in September
September, the first month of the autumn in Red Bluff, is still a tropical month, with an average temperature ranging between max 88°F (31.1°C) and min 60.6°F (15.9°C).Temperature
The arrival of September correlates with a minor temperature reduction, down from August's tropical 94.6°F (34.8°C) to a still hot 88°F (31.1°C). Marked by a significant temperature drop from daytime highs, the average nighttime temperature lowers to a mild 60.6°F (15.9°C) throughout September.Humidity
The average relative humidity in September is 34%.Rainfall
In Red Bluff, during September, the rain falls for 3.3 days and regularly aggregates up to 0.24" (6mm) of precipitation. In Red Bluff, during the entire year, the rain falls for 86.1 days and collects up to 18.39" (467mm) of precipitation.Snowfall
January, March through November are months without snowfall.Daylight
The average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:37 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:52 pm PDT.
Sunshine
In September, the average sunshine is 11.1h.UV index
In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: In September, the maximum UV index of 5 transforms into these recommendations:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Red Bluff, CA
- Average high temperature in September: 88°F
The warmest month (with the highest average high temperature) is July (95.9°F).
The month with the lowest average high temperature is December (52.7°F).
- Average low temperature in September: 60.6°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is December (39.6°F).
Average pressure in September
Red Bluff, CA
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June, July and August (29.91"Hg).
Average wind speed in September
Red Bluff, CA
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is March (6.3mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in September
Red Bluff, CA
- Average humidity in September: 34%
The month with the highest relative humidity is March (71%).
The months with the lowest relative humidity are July and August (31%).
Average rainfall in September
Red Bluff, CA
- Average rainfall in September: 0.24"
The wettest months (with the highest rainfall) are March and December (3.27").
The driest months (with the least rainfall) are July and August (0.08").
Average rainfall days in September
Red Bluff, CA
- Average rainfall days in September: 3.3 days
The month with the highest number of rainy days is March (14 days).
The month with the least rainy days is August (1.1 days).
Average snowfall in September
Red Bluff, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.12").
The months with the least snowfall are January, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Red Bluff, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Red Bluff, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 11h and 6min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January and December (Average sunshine: 5h and 48min).
Average sunshine days in September
Red Bluff, CA
- Average sunshine days in September: 26 days
The month with the most sunshine days is August (28.4 days).
The month with the least sunshine days is March (15.3 days).
Average UV index in September
Red Bluff, CA
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Red Bluff, CA
- Average cloud cover in September: 8
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Red Bluff, CA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
