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
In September, the meteorological conditions change slightly, with the average high-temperature moving from 80.2°F (26.8°C) in August to a still warm 73.4°F (23°C). Despite the hot September days, Mill Creek's nights see an average temperature plunge to a chilly 44.6°F (7°C).Humidity
The average relative humidity in September in Mill Creek is 47%.Rainfall
In Mill Creek, in September, it is raining for 5.5 days, with typically 0.67" (17mm) of accumulated precipitation. In Mill Creek, during the entire year, the rain falls for 98.1 days and collects up to 32.99" (838mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.47" (12mm) of snow. Throughout the year, in Mill Creek, there are 66 snowfall days, and 127.72" (3244mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:34 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:49 pm PDT.
Sunshine
In Mill Creek, California, the average sunshine in September is 11.1h.UV index
The average daily maximum UV index in September in Mill Creek is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The daily maximum UV index of 4 in September interprets into the following advice:
Take measures. Individuals with light skin might experience burns in under 30 minutes. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Frequently asked questions
What are the temperatures in Mill Creek in September?
What is the average humidity in September in Mill Creek?
How many days does it rain in September in Mill Creek?
When does it start snowing in Mill Creek?
How many hours of daylight does Mill Creek have in September?
What time are sunrise and sunset in September in Mill Creek?
How many hours of sunshine does Mill Creek have in September?
How high is the UV index in September in Mill Creek?
Average temperature in September
Mill Creek, CA
- Average high temperature in September: 73.4°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is December (38.3°F).
- Average low temperature in September: 44.6°F
The month with the highest average low temperature is July (49.5°F).
The coldest month (with the lowest average low temperature) is December (24.1°F).
Average pressure in September
Mill Creek, CA
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Mill Creek, CA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is March (6.7mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Mill Creek, CA
- Average humidity in September: 47%
The month with the highest relative humidity is March (83%).
The month with the lowest relative humidity is July (42%).
Average rainfall in September
Mill Creek, CA
- Average rainfall in September: 0.67"
The wettest month (with the highest rainfall) is March (5.59").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in September
Mill Creek, CA
- Average rainfall days in September: 5.5 days
The month with the highest number of rainy days is May (13.4 days).
The month with the least rainy days is August (4 days).
Average snowfall in September
Mill Creek, CA
- Average snowfall in September: 0.47"
The month with the highest snowfall is March (27.05").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Mill Creek, CA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is March (14 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Mill Creek, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 11h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in September
Mill Creek, CA
- Average sunshine days in September: 23.1 days
The month with the most sunshine days is August (25 days).
The month with the least sunshine days is March (10.9 days).
Average UV index in September
Mill Creek, CA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February and November (UV index 1).
Average cloud cover in September
Mill Creek, CA
- Average cloud cover in September: 12
The month with the most cloud cover is March (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 7).
Average visibility in September
Mill Creek, CA
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
Mill Creek, California, USA
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