Climate and monthly weather forecast
Portola, CA

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Weather in January

January, the same as December, is another cold winter month in Portola, California, with an average temperature fluctuating between 23.2°F (-4.9°C) and 38.8°F (3.8°C). Portola's shift from December to January is accompanied by an average high-temperature of a still cold 38.8°F (3.8°C), a slight deviation from 37.2°F (2.9°C). Weather in January »

Weather in February

February, the last month of the winter in Portola, is also a wintry month, with an average temperature ranging between max 39.6°F (4.2°C) and min 22.8°F (-5.1°C). The average high-temperature in February, at a still icy 39.6°F (4.2°C), reveals a modest deviation from January's 38.8°F (3.8°C). Weather in February »

Weather in March

March, the first month of the spring in Portola, is a frosty month, with an average temperature varying between 43.2°F (6.2°C) and 25.3°F (-3.7°C). The commencement of March brings an average high-temperature of a frosty 43.2°F (6.2°C), marking an inconsequential divergence from February. Weather in March »

Weather in April

April is a fresh spring month in Portola, California, with temperature in the range of an average low of 29.7°F (-1.3°C) and an average high of 51.4°F (10.8°C). The start of April brings a subtle rise in the average high-temperature, moving from a chilly 43.2°F (6.2°C) in March to a cool 51.4°F (10.8°C). Weather in April »

Weather in May

The last month of the spring, May, is a refreshing month in Portola, California, with an average temperature varying between 35.8°F (2.1°C) and 60.6°F (15.9°C). As Portola transitions into May, the average high-temperature shows a change, moving from a fresh 51.4°F (10.8°C) in April to a refreshing 60.6°F (15.9°C). Weather in May »

Weather in June

The first month of the summer, June, is a pleasant month in Portola, California, with temperature in the range of an average low of 42.1°F (5.6°C) and an average high of 72.7°F (22.6°C). In Portola, the average high-temperature in June increases from a mild 60.6°F (15.9°C) in May to a pleasant 72.7°F (22.6°C). Weather in June »

Weather in July

July in Portola, California, is a moderately hot summer month, with an average temperature varying between 82.9°F (28.3°C) and 47.5°F (8.6°C). July, recognised by an average high temperature of 82.9°F (28.3°C) and a low of 47.5°F (8.6°C), is Portola's warmest month. During July, the heat index is calculated to be 82.4°F (28°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Portola, California, with an average temperature ranging between min 46°F (7.8°C) and max 81.1°F (27.3°C). Portola's August reports an average high-temperature of a still warm 81.1°F (27.3°C), exhibiting a minor difference from July. Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Portola, California, with an average temperature fluctuating between 42.3°F (5.7°C) and 73.8°F (23.2°C). In Portola, the beginning of September is marked by a marginally lowered average high-temperature, shifting from August's 81.1°F (27.3°C) to a still moderately hot 73.8°F (23.2°C). Weather in September »

Weather in October

October, the same as September, in Portola, California, is another refreshing autumn month, with an average temperature fluctuating between 34.9°F (1.6°C) and 60.4°F (15.8°C). 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). Weather in October »

Weather in November

November, the last month of the autumn in Portola, is another chilly month, with temperature in the range of an average low of 27°F (-2.8°C) and an average high of 47.3°F (8.5°C). Portola's progression into November involves a drop in the average high-temperature, receding from a moderate 60.4°F (15.8°C) in October to a frosty 47.3°F (8.5°C). Weather in November »

Weather in December

December, the first month of the winter in Portola, is still a cold month, with an average temperature ranging between max 37.2°F (2.9°C) and min 21.6°F (-5.8°C). The month of December sees the lowest average temperatures, reaching 37.2°F (2.9°C) at the peak and 21.6°F (-5.8°C) at the low. Weather in December »
Updated: Feb 9, 2024 | Published by: Weather U.S. | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What is the most humid month in Portola?

The months with the highest humidity in Portola, California, are January and March, with an average relative humidity of 81%.

How much does it rain in Portola?

In Portola, during the entire year, the rain falls for 80.1 days and collects up to 22.95" (583mm) of precipitation.

When does it snow in Portola?

Months with snowfall in Portola, California, are January through June, September through December.

How much does it snow in Portola?

Throughout the year, there are 69.3 snowfall days, and 103.5" (2629mm) of snow is accumulated.

What is the month with the least sunshine in Portola?

January has the least sunshine of the year in Portola, with an average of 5h of sunshine.

What is the wettest month in Portola?

The month with the most rainfall is March, when the rain falls for 10.1 days and typically aggregates up to 4.02" (102mm) of precipitation.

When is Daylight Saving Time (DST) in Portola?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Portola, California, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.

When are the longest days in Portola?

The month with the longest days in Portola is June, with an average of 14h and 54min of daylight.

When is the highest UV index in Portola?

The months with the highest UV index are June through August, with an average maximum UV index of 5.

What part of the year is the hottest in Portola?

The temperatures in Portola, California, reach their highest averages in July, with highs of 82.9°F (28.3°C) and lows of 47.5°F (8.6°C).

What are the least humid months in Portola?

The months with the lowest humidity in Portola are July and August, with an average relative humidity of 40%.

When it does not snow in Portola?

In Portola, snow does not fall in July and August.

What month has the most sunshine in Portola?

The month with the most sunshine in Portola, California, is July, with an average of 12h of sunshine.

What is the driest month in Portola?

August is the month with the least rainfall in Portola, California. Rain falls for 3.4 days and accumulates 0.2" (5mm) of precipitation.

When is the lowest UV index in Portola?

With an average maximum UV index of 1, November is the month with the lowest UV index in Portola.

What is the coldest month in Portola?

The coldest period in Portola is December, when temperatures fluctuate between an average high of 37.2°F (2.9°C) and a low of 21.6°F (-5.8°C).

When does it snow the most in Portola?

The month with the most snowfall in Portola, California, is December, when snow falls for 12.8 days and typically aggregates up to 22.52" (572mm) of snow.

What is the month with the shortest days in Portola?

With an average of 9h and 24min of daylight, December has the shortest days of the year in Portola, California.

Average temperature
Portola, CA

Average temperature - Portola, CA

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).

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
Portola, CA

Average pressure - Portola, CA

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
Portola, CA

Average wind speed - Portola, CA

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
Portola, CA

Average humidity - Portola, CA

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
Portola, CA

Average rainfall - Portola, CA

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
Portola, CA

Average rainfall days - Portola, CA

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
Portola, CA

Average snowfall - Portola, CA

The month with the highest snowfall is December (22.52").
The months with the least snowfall are July and August (0").

Average snowfall days
Portola, CA

Average snowfall days - Portola, CA

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 / Average sunshine
Portola, CA

Average daylight / Average sunshine - Portola, CA

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).

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is January (Average sunshine: 5h).

Average sunshine days
Portola, CA

Average sunshine days - Portola, CA

The month with the most sunshine days is August (26 days).
The month with the least sunshine days is March (11.8 days).

Average visibility
Portola, CA

Average visibility - Portola, CA

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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