September weather forecastCallahan, CA
September
Weather in September
The first month of the autumn, September, is still a warm month in Callahan, California, with an average temperature ranging between max 76.1°F (24.5°C) and min 45.7°F (7.6°C).Temperature
The arrival of September corresponds with a light shift in temperature, down from 83.8°F (28.8°C) in August to a still moderately hot 76.1°F (24.5°C). Callahan reports a substantial plunge from daytime highs during the nights of September, with an average low-temperature of 45.7°F (7.6°C).Humidity
The average relative humidity in September is 50%.Rainfall
In Callahan, California, during September, the rain falls for 4.9 days and regularly aggregates up to 0.51" (13mm) of precipitation. In Callahan, during the entire year, the rain falls for 107.9 days and collects up to 24.76" (629mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows in Callahan. Throughout September, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow. In Callahan, during the entire year, snow falls for 47.5 days and aggregates up to 57.4" (1458mm) of snow.Daylight
The average length of the day in September in Callahan is 12h and 27min.On the first day of the month, sunrise is at 6:38 am and sunset at 7:43 pm. On the last day of September, in Callahan, California, sunrise is at 7:07 am and sunset at 6:54 pm PDT.
Sunshine
In September, the average sunshine is 11h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 4 suggests this advice:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Callahan, CA
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is December (41°F).
- Average low temperature in September: 45.7°F
The month with the highest average low temperature is July (51.1°F).
The coldest month (with the lowest average low temperature) is December (27.1°F).
Average pressure in September
Callahan, CA
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.94"Hg).
Average wind speed in September
Callahan, CA
- Average wind speed in September: 4.5mph
The windiest month (with the highest average wind speed) is March (5.8mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).
Average humidity in September
Callahan, CA
- Average humidity in September: 50%
The month with the highest relative humidity is March (81%).
The month with the lowest relative humidity is August (45%).
Average rainfall in September
Callahan, CA
- Average rainfall in September: 0.51"
The wettest month (with the highest rainfall) is March (4.17").
The driest months (with the least rainfall) are July and August (0.31").
Average rainfall days in September
Callahan, CA
- Average rainfall days in September: 4.9 days
The month with the highest number of rainy days is March (14.6 days).
The month with the least rainy days is August (3.1 days).
Average snowfall in September
Callahan, CA
- Average snowfall in September: 0.08"
The month with the highest snowfall is March (14.02").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Callahan, CA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is March (11.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Callahan, CA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 11h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in September
Callahan, CA
- Average sunshine days in September: 23.4 days
The month with the most sunshine days is August (24.1 days).
The month with the least sunshine days is March (10.9 days).
Average UV index in September
Callahan, CA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Callahan, CA
- Average cloud cover in September: 12
The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in September
Callahan, CA
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
