September weather forecast
Yreka, CA

Weather in September

The first month of the autumn, September, is also a moderately hot month in Yreka, California, with temperature in the range of an average high of 75.9°F (24.4°C) and an average low of 44.8°F (7.1°C).

Temperature

In Yreka, the average high-temperature in September marginally drops, from 84.2°F (29°C) in August, to a still moderately hot 75.9°F (24.4°C). The average low-temperature, in Yreka, California, is 44.8°F (7.1°C).

Humidity

In Yreka, the average relative humidity in September is 55%.

Rainfall

In Yreka, during September, the rain falls for 4.1 days and regularly aggregates up to 0.43" (11mm) of precipitation. Throughout the year, in Yreka, there are 116 rainfall days, and 17.8" (452mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall in Yreka.

Daylight

In Yreka, California, the average length of the day is 12.4h.

Sunshine

In September, the average sunshine is 11h.

UV index

In September, the average daily maximum UV index in Yreka is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 4 in September 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Yreka?

In Yreka, California, the average relative humidity in September is 55%.

How much does it rain in Yreka in September?

In September, in Yreka, California, the rain falls for 4.1 days. Throughout September, 0.43" (11mm) of precipitation is accumulated.

When it does not snow in Yreka?

May through September are months without snowfall in Yreka.

Does it snow in Yreka in September?

In Yreka, California, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Yreka have in September?

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

How many hours of sunshine does Yreka have in September?

The average sunshine in September in Yreka is 11h.

What is the UV index intensity in September in Yreka?

In Yreka, California, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Yreka, CA

Average temperature in September - Yreka, CA
  • Average high temperature in September: 75.9°F

The warmest months (with the highest average high temperature) are July and August (84.2°F).
The month with the lowest average high temperature is December (41.5°F).

  • Average low temperature in September: 44.8°F

The month with the highest average low temperature is August (50.2°F).
The coldest month (with the lowest average low temperature) is December (26.6°F).

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Average pressure in September
Yreka, CA

Average pressure in September - Yreka, CA
  • Average pressure in September: 29.97"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is August (29.96").

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Average wind speed in September
Yreka, CA

Average wind speed in September - Yreka, CA
  • Average wind speed in September: 4mph

The windiest month (with the highest average wind speed) is March (5.4mph).
The calmest month (with the lowest average wind speed) is August (3.6mph).

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Average humidity in September
Yreka, CA

Average humidity in September - Yreka, CA
  • Average humidity in September: 55%

The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (52%).

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Average rainfall in September
Yreka, CA

Average rainfall in September - Yreka, CA
  • Average rainfall in September: 0.43"

The wettest month (with the highest rainfall) is December (2.99").
The driest month (with the least rainfall) is July (0.16").

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Average rainfall days in September
Yreka, CA

Average rainfall days in September - Yreka, CA
  • Average rainfall days in September: 4.1 days

The month with the highest number of rainy days is March (16.7 days).
The month with the least rainy days is July (3.2 days).

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Average snowfall in September
Yreka, CA

Average snowfall in September - Yreka, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (5.39").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Yreka, CA

Average snowfall days in September - Yreka, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (7.4 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in September: 11h

The month with the most sunshine is July (Average sunshine: 12.1h).
Months with the least sunshine are January and December (Average sunshine: 5.7).

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Average sunshine days in September
Yreka, CA

Average sunshine days in September - Yreka, CA
  • Average sunshine days in September: 25.1 days

The month with the most sunshine days is August (25.7 days).
The month with the least sunshine days is March (11 days).

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Average UV index in September
Yreka, CA

Average UV index in September - Yreka, CA
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in September
Yreka, CA

Average cloud cover in September - Yreka, CA
  • Average cloud cover in September: 14

Months with the most cloud cover are March and December (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 8).

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Average visibility in September
Yreka, CA

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

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

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