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 snowfall in September
- Average snowfall 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
Start of September brings a slight shift in the average high-temperature, dipping a bit from August's agreeable 73.2°F (22.9°C) to an enjoyable 67.3°F (19.6°C). A noteworthy temperature dip to a cold 42.3°F (5.7°C) is observed during the nights of September.Humidity
In September, the average relative humidity is 45%.Rainfall
In Kirkwood, during September, the rain falls for 4.3 days and regularly aggregates up to 0.39" (10mm) of precipitation. Throughout the year, there are 45.4 rainfall days, and 26.06" (662mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 1 snowfall days, it receives 0.63" (16mm) of snow. In Kirkwood, during the entire year, snow falls for 83.9 days and aggregates up to 153.46" (3898mm) of snow.Daylight
The average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:56 am and sunset at 6:43 pm PDT.
Sunshine
The average sunshine in September is 11.1h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the maximum UV index of 3 transforms into these recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How much does it rain in September?
When does it start snowing?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Kirkwood, CA
- Average high temperature in September: 67.3°F
The warmest month (with the highest average high temperature) is July (74.1°F).
The month with the lowest average high temperature is December (35.4°F).
- Average low temperature in September: 42.3°F
The month with the highest average low temperature is July (47.1°F).
The coldest month (with the lowest average low temperature) is December (20.1°F).
Average pressure in September
Kirkwood, CA
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Kirkwood, CA
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is March (7.5mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in September
Kirkwood, CA
- Average humidity in September: 45%
The month with the highest relative humidity is March (82%).
The month with the lowest relative humidity is August (41%).
Average rainfall in September
Kirkwood, CA
- Average rainfall in September: 0.39"
The wettest month (with the highest rainfall) is March (4.69").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in September
Kirkwood, CA
- Average rainfall days in September: 4.3 days
The month with the highest number of rainy days is May (6.9 days).
The month with the least rainy days is November (1.3 days).
Average snowfall in September
Kirkwood, CA
- Average snowfall in September: 0.63"
The month with the highest snowfall is March (33.46").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Kirkwood, CA
- Average snowfall days in September: 1 days
The month with the highest number of snowfall days is March (15.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Kirkwood, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 11h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in September
Kirkwood, CA
- Average sunshine days in September: 25.2 days
The month with the most sunshine days is August (25.6 days).
The month with the least sunshine days is March (14.7 days).
Average UV index in September
Kirkwood, CA
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Kirkwood, CA
- Average cloud cover in September: 10
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 8).
Average visibility in September
Kirkwood, CA
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, April and December (5mi).
Kirkwood, California, USA
Weather forecast for your location
2. Allow the app to use your location