October weather forecastPortola, CA
October
Weather in October
October, the same as September, in Portola, California, is another mild autumn month, with an average temperature ranging between max 60.4°F (15.8°C) and min 34.9°F (1.6°C).Temperature
The shift from September to October corresponds with a decrease in the average high-temperature, down to a refreshing 60.4°F (15.8°C) from a warm 73.8°F (23.2°C). Portola records a pronounced decline from the day's peak to an average nighttime low-temperature of 34.9°F (1.6°C) throughout October.Humidity
The average relative humidity in October is 54%.Rainfall
In October, the rain falls for 5 days. Throughout October, 0.91" (23mm) of precipitation is accumulated. Throughout the year, there are 80.1 rainfall days, and 22.95" (583mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. In October, it is snowing for 1.2 days. Throughout October, 1.1" (28mm) of snow is accumulated. Throughout the year, there are 69.3 snowfall days, and 103.5" (2629mm) of snow is accumulated.Daylight
In October, the average length of the day is 11h and 8min.On the first day of the month, sunrise is at 6:58 am and sunset at 6:43 pm. On the last day of October, in Portola, sunrise is at 7:30 am and sunset at 6:00 pm PDT.
Sunshine
In October, the average sunshine 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 threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 3 during October translates into the following directions:
Undertake precautions - It is suggested to shield oneself from sunburn. When the Sun is at its strongest around midday, find shade and limit exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 6min
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 12min
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).
