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
As Willow Creek welcomes September, the average high-temperature records at a still pleasant 68°F (20°C), marking an insignificant deviation from the prior month. During the month of September, the nighttime temperature in Willow Creek, California, falls to an average of 51.1°F (10.6°C).Humidity
September and October, with an average relative humidity of 76%, are the least humid months.Rainfall
In Willow Creek, during September, the rain falls for 4.6 days and regularly aggregates up to 0.83" (21mm) of precipitation. Throughout the year, there are 114.9 rainfall days, and 31.61" (803mm) of precipitation is accumulated.Snowfall
January, March through December are months without snowfall in Willow Creek.Daylight
The average length of the day in September in Willow Creek, California, is 12h and 27min.On the first day of September, sunrise is at 6:42 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:57 pm PDT.
Sunshine
The average sunshine in September is 10.2h.UV index
In September, the average daily maximum UV index in Willow Creek is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: In September, a daily UV index of 4 turns into the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Willow Creek in September?
What are the least humid months in Willow Creek?
What is the average humidity in September in Willow Creek?
How many days does it rain in September in Willow Creek?
When it does not snow in Willow Creek?
How many hours of daylight does Willow Creek have in September?
What time are sunrise and sunset in September in Willow Creek?
How many hours of sunshine does Willow Creek have in September?
How high is the UV index in September in Willow Creek?
Average temperature in September
Willow Creek, CA
- Average high temperature in September: 68°F
The warmest month (with the highest average high temperature) is August (68.9°F).
The month with the lowest average high temperature is December (52.7°F).
- Average low temperature in September: 51.1°F
The month with the highest average low temperature is August (51.4°F).
The coldest month (with the lowest average low temperature) is February (41.7°F).
Average pressure in September
Willow Creek, CA
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is August (29.97"Hg).
Average wind speed in September
Willow Creek, CA
- Average wind speed in September: 5.6mph
The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in September
Willow Creek, CA
- Average humidity in September: 76%
The month with the highest relative humidity is March (82%).
The months with the lowest relative humidity are September and October (76%).
Average rainfall in September
Willow Creek, CA
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is December (5.87").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in September
Willow Creek, CA
- Average rainfall days in September: 4.6 days
The month with the highest number of rainy days is March (16.8 days).
The months with the least rainy days are July and August (2.2 days).
Average snowfall in September
Willow Creek, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.39").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Willow Creek, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Willow Creek, CA
- Average daylight in September: 12h and 2min
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: 10h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The months with the least sunshine are January and December (Average sunshine: 5h and 6min).
Average sunshine days in September
Willow Creek, CA
- Average sunshine days in September: 24.7 days
The months with the most sunshine days are July and August (28 days).
The month with the least sunshine days is March (12.5 days).
Average UV index in September
Willow Creek, CA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 3).
Average cloud cover in September
Willow Creek, CA
- Average cloud cover in September: 19
The month with the most cloud cover is March (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in September
Willow Creek, CA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Willow Creek, California, USA
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