Contents
- Weather in October
- Frequently asked questions
- Average temperature in October
- Average pressure in October
- Average wind speed in October
- Average humidity in October
- Average rainfall in October
- Average rainfall days in October
- Average snowfall in October
- Average snowfall days in October
- Average daylight in October
- Average sunshine in October
- Average sunshine days in October
- Average UV index in October
- Average cloud cover in October
- Average visibility in October
Weather in October
Temperature
The arrival of October indicates a decrease in the average high-temperature, moving from a warm 73.8°F (23.2°C) in September to a mild 60.4°F (15.8°C). A dramatic downturn marks the October nights in Portola, with lows averaging at a wintry 34.9°F (1.6°C).Humidity
In October, the average relative humidity in Portola is 54%.Rainfall
In Portola, in October, during 5 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. In Portola, California, during the entire year, the rain falls for 80.1 days and collects up to 22.95" (583mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. In October, in Portola, California, it is snowing for 1.2 days. Throughout October, 1.1" (28mm) of snow is accumulated. In Portola, during the entire year, snow falls for 69.3 days and aggregates up to 103.5" (2629mm) of snow.Daylight
In October, the average length of the day is 11h and 8min.On the first day of October, sunrise is at 6:58 am and sunset at 6:43 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 6:00 pm PDT.
Sunshine
The average sunshine in October in Portola, California, is 7.2h.UV index
The average daily maximum UV index in October is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index, 3 during October, leads to the following recommendations:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
What are October temperatures in Portola?
What is the average humidity in October in Portola?
How many days does it rain in October in Portola?
How much does it snow in Portola in October?
What is the average length of the day in October in Portola?
When is the sunrise / sunset in October in Portola?
How many hours of sunshine does Portola have in October?
What is the UV index intensity in October in Portola?
Average temperature in October
Portola, CA
- Average high temperature in October: 60.4°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (37.2°F).
- Average low temperature in October: 34.9°F
The month with the highest average low temperature is July (47.5°F).
The coldest month (with the lowest average low temperature) is December (21.6°F).
Average pressure in October
Portola, CA
- Average pressure in October: 30.02"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in October
Portola, CA
- Average wind speed in October: 5.5mph
The windiest month (with the highest average wind speed) is March (6.6mph).
The calmest months (with the lowest average wind speed) are August and September (5.2mph).
Average humidity in October
Portola, CA
- Average humidity in October: 54%
The months with the highest relative humidity are January and March (81%).
The months with the lowest relative humidity are July and August (40%).
Average rainfall in October
Portola, CA
- Average rainfall in October: 0.91"
The wettest month (with the highest rainfall) is March (4.02").
The driest month (with the least rainfall) is August (0.2").
Average rainfall days in October
Portola, CA
- Average rainfall days in October: 5 days
The month with the highest number of rainy days is May (11.8 days).
The month with the least rainy days is July (3.3 days).
Average snowfall in October
Portola, CA
- Average snowfall in October: 1.1"
The month with the highest snowfall is December (22.52").
The months with the least snowfall are July and August (0").
Average snowfall days in October
Portola, CA
- Average snowfall days in October: 1.2 days
The month with the highest number of snowfall days is March (14.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in October /
Average sunshine in October
Portola, CA
- Average daylight in October: 11h and 1min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in October: 7h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days in October
Portola, CA
- Average sunshine days in October: 24.8 days
The month with the most sunshine days is August (26 days).
The month with the least sunshine days is March (11.8 days).
Average UV index in October
Portola, CA
- Average UV index in October: 3
The months with the highest UV index are June, July and August (UV index 5).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in October
Portola, CA
- Average cloud cover in October: 20
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility in October
Portola, CA
- Average visibility in October: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).
Portola, California, USA
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