September weather forecastCastella, CA
September
Weather in September
The first month of the autumn, September, is still a warm month in Castella, California, with temperature in the range of an average low of 46.2°F (7.9°C) and an average high of 77.2°F (25.1°C).Temperature
September is characterized by a mild reduction in the average high-temperature, from 84.7°F (29.3°C) in August to a still moderately hot 77.2°F (25.1°C). A significant drop from the day's peak to an average low-temperature of 46.2°F (7.9°C) is noted during the nights in September.Humidity
The average relative humidity in September in Castella is 49%.Rainfall
In September, the rain falls for 4.6 days. Throughout September, 0.51" (13mm) of precipitation is accumulated. In Castella, California, during the entire year, the rain falls for 113.4 days and collects up to 31.3" (795mm) of precipitation.Snowfall
In Castella, California, snow does not fall in June through September.Daylight
In Castella, California, the average length of the day in September is 12h and 27min.On the first day of September, sunrise is at 6:36 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:52 pm PDT.
Sunshine
In Castella, the average sunshine in September is 11.1h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Castella, CA
- Average high temperature in September: 77.2°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is December (41°F).
- Average low temperature in September: 46.2°F
The months with the highest average low temperature are July and August (51.4°F).
The coldest month (with the lowest average low temperature) is December (26.8°F).
Average pressure in September
Castella, 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 (29.93"Hg).
Average wind speed in September
Castella, CA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is March (5.7mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).
Average humidity in September
Castella, CA
- Average humidity in September: 49%
The month with the highest relative humidity is March (81%).
The month with the lowest relative humidity is August (44%).
Average rainfall in September
Castella, CA
- Average rainfall in September: 0.51"
The wettest month (with the highest rainfall) is March (5.55").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in September
Castella, CA
- Average rainfall days in September: 4.6 days
The month with the highest number of rainy days is March (17.3 days).
The month with the least rainy days is August (2.7 days).
Average snowfall in September
Castella, CA
- Average snowfall in September: 0"
The month with the highest snowfall is January (12.6").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Castella, CA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (6.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Castella, 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 6min
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 12min).
Average sunshine days in September
Castella, CA
- Average sunshine days in September: 23.9 days
The month with the most sunshine days is August (25.7 days).
The month with the least sunshine days is March (11.1 days).
Average UV index in September
Castella, 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, March, November and December (UV index 2).
Average cloud cover in September
Castella, CA
- Average cloud cover in September: 11
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in September
Castella, 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).
