Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The shift into September uncovers an average high-temperature of a still warm 79.7°F (26.5°C), subtly different from the previous month. September is noted for a mean low-temperature of 62.1°F (16.7°C).Humidity
In September, the average relative humidity is 55%.Rainfall
In Simi Valley, during September, the rain falls for 2.7 days and regularly aggregates up to 0.2" (5mm) of precipitation. In Simi Valley, during the entire year, the rain falls for 53.7 days and collects up to 9.61" (244mm) of precipitation.Daylight
In September, the average length of the day is 12h and 22min.On the first day of September in Simi Valley, California, sunrise is at 6:29 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:40 pm PDT.
Sunshine
In Simi Valley, the average sunshine in September is 10.9h.UV index
In September, the average daily maximum UV index in Simi Valley is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. To avoid the Sun's strongest rays, limit exposure around the mid-day period. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Frequently asked questions
What is the average September temperature in Simi Valley?
What is the average humidity in September in Simi Valley?
How many days does it rain in September in Simi Valley?
What is the average length of the day in September in Simi Valley?
When are sunrise and sunset in September in Simi Valley?
How long on average sun shines in September in Simi Valley?
How high is the UV index in September in Simi Valley?
Average temperature in September
Simi Valley, CA
- Average high temperature in September: 79.7°F
The warmest month (with the highest average high temperature) is August (82.2°F).
The month with the lowest average high temperature is December (60.1°F).
- Average low temperature in September: 62.1°F
The month with the highest average low temperature is August (63.1°F).
The coldest month (with the lowest average low temperature) is December (46.4°F).
Average pressure in September
Simi Valley, CA
- Average pressure in September: 29.9"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are June and September (29.9"Hg).
Average wind speed in September
Simi Valley, CA
- Average wind speed in September: 4.5mph
The windiest month (with the highest average wind speed) is December (6.5mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in September
Simi Valley, CA
- Average humidity in September: 55%
The month with the highest relative humidity is June (62%).
The month with the lowest relative humidity is November (50%).
Average rainfall in September
Simi Valley, CA
- Average rainfall in September: 0.2"
The wettest month (with the highest rainfall) is February (1.93").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in September
Simi Valley, CA
- Average rainfall days in September: 2.7 days
The month with the highest number of rainy days is March (8 days).
The months with the least rainy days are June and August (1.5 days).
Average daylight in September /
Average sunshine in September
Simi Valley, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 10h and 5min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 48min).
Average sunshine days in September
Simi Valley, CA
- Average sunshine days in September: 23.5 days
The month with the most sunshine days is August (25.4 days).
The month with the least sunshine days is February (20.9 days).
Average UV index in September
Simi Valley, CA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Simi Valley, CA
- Average cloud cover in September: 7
The month with the most cloud cover is March (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in September
Simi Valley, 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).
Simi Valley, California, USA
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