September weather forecast and climate
Kirkwood, CA

Weather in September

The first month of the autumn, September, is also an enjoyable month in Kirkwood, California, with average temperature varying between 42.3°F (5.7°C) and 67.3°F (19.6°C).

Temperature

In Kirkwood, the average high-temperature marginally drops, from an agreeable 73.2°F (22.9°C) in August, to a comfortable 67.3°F (19.6°C). In September, the average low-temperature is 42.3°F (5.7°C).

Humidity

In September, the average relative humidity is 45%.

Rainfall

In Kirkwood, it is raining for 4.3 days, with typically 0.39" (10mm) of accumulated precipitation. Throughout the year, in Kirkwood, there are 45.4 rainfall days, and 26.06" (662mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Kirkwood are January through June, September through December. September is the first month it typically snows in Kirkwood. Throughout September, in the average 1 snowfall days, it receives 0.63" (16mm) of snow. In Kirkwood, California, during the entire year, snow falls for 83.9 days, and aggregates up to 153.46" (3898mm) of snow.

Daylight

In Kirkwood, California, the average length of the day in September is 12.4h.

Sunshine

In September, the average sunshine in Kirkwood is 11.1h.

UV index

The average daily maximum UV index in Kirkwood is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in Kirkwood?

In September, in Kirkwood, the average high-temperature is 67.3°F (19.6°C), and the average low-temperature is 42.3°F (5.7°C).

What is the average humidity in September in Kirkwood?

The average relative humidity in September in Kirkwood, California, is 45%.

How many days does it rain in September in Kirkwood?

In September, in Kirkwood, the rain falls for 4.3 days. Throughout September, 0.39" (10mm) of precipitation is accumulated.

When does it start to snow in Kirkwood?

September is the first month it typically snows. Throughout September, in the average 1 snowfall days, it receives 0.63" (16mm) of snow.

How many hours of daylight does Kirkwood have in September?

In September, the average length of the day in Kirkwood, California, is 12.4h.

How many hours of sunshine does Kirkwood have in September?

In September, the average sunshine is 11.1h.

What is the UV index intensity in September in Kirkwood?

In Kirkwood, California, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV rays.

Average temperature in September
Kirkwood, CA

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).

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Average pressure in September
Kirkwood, CA

Average pressure in September - Kirkwood, CA
  • Average pressure in September: 29.94"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Kirkwood, CA

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).

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Average humidity in September
Kirkwood, CA

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%).

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Average rainfall in September
Kirkwood, CA

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").

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Average rainfall days in September
Kirkwood, CA

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).

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Average snowfall in September
Kirkwood, CA

Average snowfall in September - Kirkwood, CA
  • Average snowfall in September: 0.63"

The month with the highest snowfall is March (33.46").
Months with the least snowfall are July and August (0").

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Average snowfall days in September
Kirkwood, CA

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).
Months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Kirkwood, CA

Average daylight in September / Average sunshine in September - Kirkwood, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 11.1h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.4h).

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Average sunshine days in September
Kirkwood, CA

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).

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Average UV index in September
Kirkwood, CA

Average UV index in September - Kirkwood, CA
  • Average UV index in September: 3

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).

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Average cloud cover in September
Kirkwood, CA

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).

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Average visibility in September
Kirkwood, CA

Average visibility in September - Kirkwood, CA
  • Average visibility in September: 6mi

Months with the highest visibility are May, June, July, August, September, October and November (6mi).
Months with the lowest visibility are January, February, March, April and December (5mi).

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