October weather forecast and climate
Grass Valley, CA

Weather in October

October, the same as September, in Grass Valley, California, is another pleasant autumn month, with average temperature ranging between max 72°F (22.2°C) and min 50.7°F (10.4°C).

Temperature

In Grass Valley, California, the average high-temperature in October decreases, from a moderately hot 83.8°F (28.8°C) in September, to a pleasant 72°F (22.2°C). In October, the average low-temperature is 50.7°F (10.4°C).

Humidity

In Grass Valley, the average relative humidity is 46%.

Rainfall

In Grass Valley, in October, during 4.1 rainfall days, 1.57" (40mm) of precipitation is typically accumulated. In Grass Valley, during the entire year, the rain falls for 82 days and collects up to 33.11" (841mm) of precipitation.

Snowfall

June through October are months without snowfall in Grass Valley, California.

Daylight

In October, the average length of the day is 11.1h.

Sunshine

The average sunshine in October is 7.1h.

UV index

The average daily maximum UV index in Grass Valley is 4. A UV Index reading of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In October, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in October in Grass Valley?

The average high-temperature, in October, is 72°F (22.2°C), while the average low-temperature is 50.7°F (10.4°C).

What is the average humidity in October in Grass Valley?

In October, the average relative humidity is 46%.

How much does it rain in Grass Valley in October?

In Grass Valley, California, in October, it is raining for 4.1 days, with typically 1.57" (40mm) of accumulated precipitation.

Does it snow in Grass Valley in October?

In Grass Valley, California, in October, it doesn't snow. In November, it regularly snows.

When it does not snow in Grass Valley?

In Grass Valley snow does not fall in June through October.

How many hours of daylight does Grass Valley have in October?

In October, the average length of the day is 11.1h.

How many hours of sunshine does Grass Valley have in October?

The average sunshine in October in Grass Valley is 7.1h.

How high is the UV index in October in Grass Valley?

In October, the average daily maximum UV index in Grass Valley is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV radiation.

Average temperature in October
Grass Valley, CA

Average temperature in October - Grass Valley, CA
  • Average high temperature in October: 72°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (51.3°F).

  • Average low temperature in October: 50.7°F

The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).

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Average pressure in October
Grass Valley, CA

Average pressure in October - Grass Valley, CA
  • Average pressure in October: 30"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in October
Grass Valley, CA

Average wind speed in October - Grass Valley, CA
  • Average wind speed in October: 5.4mph

The windiest month (with the highest average wind speed) is February (6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in October
Grass Valley, CA

Average humidity in October - Grass Valley, CA
  • Average humidity in October: 46%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (37%).

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Average rainfall in October
Grass Valley, CA

Average rainfall in October - Grass Valley, CA
  • Average rainfall in October: 1.57"

The wettest month (with the highest rainfall) is March (6.57").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in October
Grass Valley, CA

Average rainfall days in October - Grass Valley, CA
  • Average rainfall days in October: 4.1 days

The month with the highest number of rainy days is March (15.1 days).
The month with the least rainy days is July (1.1 days).

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Average snowfall in October
Grass Valley, CA

Average snowfall in October - Grass Valley, CA
  • Average snowfall in October: 0"

The month with the highest snowfall is February (6.42").
Months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in October
Grass Valley, CA

Average snowfall days in October - Grass Valley, CA
  • Average snowfall days in October: 0 days

The month with the highest number of snowfall days is March (2.4 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in October /
Average sunshine in October
Grass Valley, CA

Average daylight in October / Average sunshine in October - Grass Valley, CA
  • Average daylight in October: 11.1h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in October: 7.1h

The month with the most sunshine is July (Average sunshine: 12.2h).
The month with the least sunshine is January (Average sunshine: 5.7h).

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Average sunshine days in October
Grass Valley, CA

Average sunshine days in October - Grass Valley, CA
  • Average sunshine days in October: 26.3 days

The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is March (14.8 days).

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Average UV index in October
Grass Valley, CA

Average UV index in October - Grass Valley, CA
  • Average UV index in October: 4

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is November (UV index 2).

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Average cloud cover in October
Grass Valley, CA

Average cloud cover in October - Grass Valley, CA
  • Average cloud cover in October: 16

The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in October
Grass Valley, CA

Average visibility in October - Grass Valley, CA
  • Average visibility in October: 6mi

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

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