September weather forecastPosts, CA
September
Weather in September
September, the first month of the autumn in Posts, is also an agreeable month, with an average temperature varying between 55.4°F (13°C) and 69.6°F (20.9°C).Temperature
The month of September sees the highest average temperatures, reaching 69.6°F (20.9°C) at the peak and 55.4°F (13°C) at the low.Humidity
In September, the average relative humidity is 75%.Rainfall
In Posts, during September, the rain falls for 2.4 days and regularly aggregates up to 0.08" (2mm) of precipitation. In Posts, during the entire year, the rain falls for 70 days and collects up to 11.93" (303mm) of precipitation.Daylight
In Posts, California, the average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 6:39 am and sunset at 7:34 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:51 pm PDT.
Sunshine
In Posts, the average sunshine in September is 11h.UV index
The months with the highest UV index in Posts, California, are June through September, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 5 in September translates into this advice:
Put precautions into practice - Guidance to elude sunburn is provided. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Posts, CA
- Average high temperature in September: 69.6°F
The warmest month (with the highest average high temperature) is September (69.6°F).
The month with the lowest average high temperature is December (57°F).
- Average low temperature in September: 55.4°F
The month with the highest average low temperature is September (55.4°F).
The coldest month (with the lowest average low temperature) is December (46.9°F).
Average pressure in September
Posts, CA
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.93"Hg).
Average wind speed in September
Posts, CA
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Posts, CA
- Average humidity in September: 75%
The month with the highest relative humidity is August (79%).
The month with the lowest relative humidity is November (70%).
Average rainfall in September
Posts, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is December (2.48").
The driest month (with the least rainfall) is August (0.04").
Average rainfall days in September
Posts, CA
- Average rainfall days in September: 2.4 days
The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (1.3 days).
Average daylight in September /
Average sunshine in September
Posts, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 11h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in September
Posts, CA
- Average sunshine days in September: 26.8 days
The month with the most sunshine days is August (27.8 days).
The month with the least sunshine days is March (17.3 days).
Average UV index in September
Posts, CA
- Average UV index in September: 5
The months with the highest UV index are June, July, August and September (UV index 5).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Posts, CA
- Average cloud cover in September: 15
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 13).
Average visibility in September
Posts, 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).
