California - Mountains weather in September 2025
September
California - Mountains weather in September 2025
September
Day
21 °C
Night
4 °C
Precipitation
18 mm
in month
Rainy days
4 days
in month
Daylight
12 hours
average
Sunshine
10 hours
average
Humidity
49 %
Day
21 °C
Night
4 °C
Precipitation
18 mm
in month
Rainy days
4 days
in month
Daylight
12 hours
average
Sunshine
10 hours
average
Humidity
49 %
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Weather overview and FAQs
Weather overview
In September in California - Mountains, the average air temperature ranges from 21 °C (69 °F) during the day to 4 °C (40 °F) at night. There are 4 days of rain on average, where the rainfall is 18 mm (0.71 in).
Are there good conditions to visit in California - Mountains in September?
In California - Mountains in September, there are ideal conditions for a vacation. You can expect just 4 days of rain during the month, taking an umbrella is not necessary. There are some people, who may feel a slight chill at 21 °C (69 °F), but others will feel perfectly fine. The night temperature of 4 °C (40 °F) is not inviting for evening and night activities except for visiting a bar and having beer or two.
What is the air temperature in September in California - Mountains at night?
The average night temperature in California - Mountains in September is 4 °C (40 °F). The nights will be cool, layers of clothes will be needed for evening and morning walks, the hotel should be equipped with heating.
What is the temperature in California - Mountains during the day in September?
In California - Mountains in September, the average daily temperatures will be 21 °C (69 °F). A comfortable temperature for most people, where it is neither too cold nor too hot, and a large number of activities can be carried out comfortably, including sunbathing by the water. Lighter clothing will be suitable - shorts, skirts, t-shirts, jackets; a light sweater and long trousers may also be useful.
How many days of precipitation on average can I expect in California - Mountains in September?
There are 4 days, which are rainy in September in California - Mountains, that is, days with precipitation more than 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 0.9 days of the week, or in general - 12 % days.
How many sunny hours can I expect in September in California - Mountains?
There is an average length of sunshine of 10 hours per day in September in California - Mountains.
Is there a dry season in September in California - Mountains?
Yes, there is a dry season in September in California - Mountains with just 4 days during the month being rainy.
Is the temperature rising or falling in the course of time in September in California - Mountains?
During September in California - Mountains, the day temperatures are decreasing - from 22 °C (72 °F) at the beginning of the month to 18 °C (64 °F) at the end of the month.
Is the weather in California - Mountains warmer in September than in August?
No, in California - Mountains in September the temperature is not higher than in August.
Is California - Mountains rainier in September than in October?
No, in California - Mountains in September it does not rain more than in October.
How windy is California - Mountains in September?
An average wind scale that can be expected in California - Mountains in September is 3.
How long is the day (from dawn till dusk) in California - Mountains in September?
The length of daylight in California - Mountains in September is 12 hours.
What level of humidity is to expect in September in California - Mountains?
Humidity in California - Mountains in September is 49 %.
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