October weather forecast
Saint Helena, CA

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Weather in October

October, the same as September, is a moderately hot autumn month in Saint Helena, California, with an average temperature ranging between min 50.9°F (10.5°C) and max 75°F (23.9°C).

Temperature

In October, the meteorological conditions alter, with the average high-temperature shifting from 85.3°F (29.6°C) in September to a still warm 75°F (23.9°C). Saint Helena's October nights bring a significant temperature shift, averaging at a fresh 50.9°F (10.5°C).

Humidity

In Saint Helena, the average relative humidity in October is 56%.

Rainfall

In Saint Helena, during October, the rain falls for 4.7 days and regularly aggregates up to 0.94" (24mm) of precipitation. In Saint Helena, during the entire year, the rain falls for 76.2 days and collects up to 16.93" (430mm) of precipitation.

Snowfall

January, February, April through December are months without snowfall.

Daylight

The average length of the day in October is 11h and 11min.
On the first day of October, sunrise is at 7:06 am and sunset at 6:52 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 6:10 pm PDT.

Sunshine

The average sunshine in October in Saint Helena is 6.8h.

UV index

In October, the average daily maximum UV index in Saint Helena, California, is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The UV index of 4 during October translates into the following guidance:
Ensure safety - Recommendations to avert sunburn are presented. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
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Frequently asked questions

What is the average October temperature in Saint Helena?

An average high-temperature, in October, in Saint Helena, is 75°F (23.9°C) and the average low-temperature is 50.9°F (10.5°C). In September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, is calculated to be 87.8°F (31°C).

What is the average humidity in October in Saint Helena?

The average relative humidity in October is 56%.

How many days does it rain in October in Saint Helena?

In Saint Helena, in October, it is raining for 4.7 days, with typically 0.94" (24mm) of accumulated precipitation.

When it does not snow in Saint Helena?

January, February, April through December are months without snowfall.

How many hours of daylight does Saint Helena have in October?

In October, the average day length in Saint Helena is 11h and 11min.

When are sunrise and sunset in October in Saint Helena?

In October, on the first day of the month, sunrise is at 7:06 am and sunset at 6:52 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 6:10 pm PDT.

How long on average sun shines in October in Saint Helena?

The average sunshine duration in October in Saint Helena is 6.8h.

What is the UV index intensity in October in Saint Helena?

In October, the average daily maximum UV index in Saint Helena is 4. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in October
Saint Helena, CA

Average temperature in October - Saint Helena, CA
  • Average high temperature in October: 75°F

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (54.5°F).

  • Average low temperature in October: 50.9°F

The month with the highest average low temperature is September (54.3°F).
The coldest month (with the lowest average low temperature) is December (39.6°F).

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Average pressure in October
Saint Helena, CA

Average pressure in October - Saint Helena, CA
  • Average pressure in October: 29.98"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.91"Hg).

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Average wind speed in October
Saint Helena, CA

Average wind speed in October - Saint Helena, CA
  • Average wind speed in October: 4.6mph

The windiest month (with the highest average wind speed) is May (5.8mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).

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Average humidity in October
Saint Helena, CA

Average humidity in October - Saint Helena, CA
  • Average humidity in October: 56%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (53%).

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Average rainfall in October
Saint Helena, CA

Average rainfall in October - Saint Helena, CA
  • Average rainfall in October: 0.94"

The wettest month (with the highest rainfall) is February (3.7").
The driest month (with the least rainfall) is July (0").

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Average rainfall days in October
Saint Helena, CA

Average rainfall days in October - Saint Helena, CA
  • Average rainfall days in October: 4.7 days

The month with the highest number of rainy days is March (13.5 days).
The month with the least rainy days is August (0.3 days).

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Average snowfall in October
Saint Helena, CA

Average snowfall in October - Saint Helena, CA
  • Average snowfall in October: 0"

The month with the highest snowfall is March (0.04").
The months with the least snowfall are January, February, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in October
Saint Helena, CA

Average snowfall days in October - Saint Helena, CA
  • Average snowfall days in October: 0 days

The month with the highest number of snowfall days is March (0.2 days).
The months with the least snowfall days are January, February, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in October /
Average sunshine in October
Saint Helena, CA

Average daylight in October / Average sunshine in October - Saint Helena, CA
  • Average daylight in October: 11h and 1min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in October: 6h and 5min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).

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Average sunshine days in October
Saint Helena, CA

Average sunshine days in October - Saint Helena, CA
  • Average sunshine days in October: 25.8 days

The month with the most sunshine days is July (30 days).
The month with the least sunshine days is March (15.9 days).

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Average UV index in October
Saint Helena, CA

Average UV index in October - Saint Helena, CA
  • Average UV index in October: 4

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in October
Saint Helena, CA

Average cloud cover in October - Saint Helena, CA
  • Average cloud cover in October: 20

The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 7).

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Average visibility in October
Saint Helena, CA

Average visibility in October - Saint Helena, CA
  • Average visibility in October: 6mi

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

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Saint Helena, California, USA

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