Monthly weather forecast and climate
Sunnyvale, CA

The perfect blue sky, trees, buildings, and cute water fountain all reflected in the calm pool of water with birds in Sunnyvale, California
The perfect blue sky, trees, buildings, and cute water fountain all reflected in the calm pool of water with birds in Sunnyvale, California

Weather in January

January, like December, is another mild winter month in Sunnyvale, California, with average temperature varying between 58.3°F (14.6°C) and 44.6°F (7°C). In January, the average high-temperature is almost the same as in December - a still mild 58.3°F (14.6°C). Weather in January »

Weather in February

February, the last month of the winter, in Sunnyvale, is also a moderate month, with average temperature fluctuating between 59.7°F (15.4°C) and 44.2°F (6.8°C). In Sunnyvale, the average high-temperature in February is practically the same as in January - a still mild 59.7°F (15.4°C). Weather in February »

Weather in March

The first month of the spring, March, is an enjoyable month in Sunnyvale, California, with average temperature ranging between max 62.2°F (16.8°C) and min 45.1°F (7.3°C). In March, the average high-temperature is practically the same as in February - an enjoyable 62.2°F (16.8°C). Weather in March »

Weather in April

April, the same as March, is another comfortable spring month in Sunnyvale, California, with average temperature ranging between max 65.8°F (18.8°C) and min 46.6°F (8.1°C). In April, the average high-temperature is almost the same as in March - a still comfortable 65.8°F (18.8°C). Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in Sunnyvale, California, with temperature in the range of an average low of 49.6°F (9.8°C) and an average high of 69.4°F (20.8°C). In May, the average high-temperature is relatively the same as in April - a pleasant 69.4°F (20.8°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Sunnyvale, California, with average temperature varying between 76.5°F (24.7°C) and 53.4°F (11.9°C). In Sunnyvale, California, the average high-temperature slightly increases, from an agreeable 69.4°F (20.8°C) in May, to a warm 76.5°F (24.7°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Sunnyvale, California, with average temperature ranging between max 79.9°F (26.6°C) and min 55.4°F (13°C). With an average high-temperature of 79.9°F (26.6°C) and an average low-temperature of 55.4°F (13°C), July is the warmest month. Weather in July »

Weather in August

August, the last month of the summer, in Sunnyvale, is also a moderately hot month, with average temperature varying between 56.8°F (13.8°C) and 79.3°F (26.3°C). In August, the average high-temperature is almost the same as in July - a still warm 79.3°F (26.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Sunnyvale, California, with average temperature ranging between min 55.9°F (13.3°C) and max 77.9°F (25.5°C). In Sunnyvale, California, the average high-temperature is practically the same as in August - a still moderately hot 77.9°F (25.5°C). Weather in September »

Weather in October

October, the same as September, in Sunnyvale, California, is an agreeable autumn month, with average temperature ranging between min 53.6°F (12°C) and max 71.8°F (22.1°C). In October, the average high-temperature slightly decreases, from a warm 77.9°F (25.5°C) in September, to an agreeable 71.8°F (22.1°C). Weather in October »

Weather in November

The last month of the autumn, November, is also an enjoyable month in Sunnyvale, California, with temperature in the range of an average low of 48.9°F (9.4°C) and an average high of 63.7°F (17.6°C). In November, the average high-temperature marginally drops, from a pleasant 71.8°F (22.1°C) in October, to a comfortable 63.7°F (17.6°C). Weather in November »

Weather in December

December, the first month of the winter, in Sunnyvale, is also a moderate month, with average temperature varying between 44.2°F (6.8°C) and 56.8°F (13.8°C). With an average high-temperature of 56.8°F (13.8°C) and an average low-temperature of 44.2°F (6.8°C), December is the coldest month. Weather in December »
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FAQ

How much does it rain in Sunnyvale?

In Sunnyvale, California, during the entire year, the rain falls for 50 days and collects up to 3.9" (99mm) of precipitation.

What is the wettest month in Sunnyvale?

The wettest months are February and March, with an average 0.75" (19mm) of rainfall.

What are the months with the lowest UV index in Sunnyvale?

February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.

What is the most humid month in Sunnyvale?

With an average relative humidity of 73%, March is the most humid month.

When are the longest days in Sunnyvale?

June has the longest days of the year in Sunnyvale, with an average of 14.7h of daylight.

When is the highest UV index in Sunnyvale?

With an average maximum UV index of 6, June is the month with the highest UV index in Sunnyvale, California.

What is the warmest month in Sunnyvale?

The warmest month in Sunnyvale is July, with an average high-temperature of 79.9°F (26.6°C) and an average low-temperature of 55.4°F (13°C).

What is the driest month in Sunnyvale?

The only month without rainfall is July.

What month has the most sunshine in Sunnyvale?

The month with the most sunshine is July, with an average of 12.1h of sunshine.

When does it rain in Sunnyvale?

January through June, August through December are months with rainfall in Sunnyvale, California.

What is the least humid month in Sunnyvale?

September and October, with an average relative humidity of 63%, are the least humid months in Sunnyvale, California.

What is the coldest month in Sunnyvale?

With an average high-temperature of 56.8°F (13.8°C) and an average low-temperature of 44.2°F (6.8°C), December is the coldest month in Sunnyvale.

What is the month with the shortest days in Sunnyvale?

December has the shortest days of the year, with an average of 9.6h of daylight.

What is the month with the least sunshine in Sunnyvale?

December has the least sunshine of the year in Sunnyvale, California, with an average of 5.9h of sunshine.

Average temperature
Sunnyvale, CA

Average temperature - Sunnyvale, CA

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is December (56.8°F).

The month with the highest average low temperature is August (56.8°F).
The coldest months (with the lowest average low temperature) are February and December (44.2°F).

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Average pressure
Sunnyvale, CA

Average pressure - Sunnyvale, CA

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June and September (29.92").

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Average wind speed
Sunnyvale, CA

Average wind speed - Sunnyvale, CA

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is September (4.6mph).

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Average humidity
Sunnyvale, CA

Average humidity - Sunnyvale, CA

The month with the highest relative humidity is March (73%).
Months with the lowest relative humidity are September and October (63%).

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Average rainfall
Sunnyvale, CA

Average rainfall - Sunnyvale, CA

The wettest months (with the highest rainfall) are February and March (0.75").
The driest month (with the least rainfall) is July (0").

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Average rainfall days
Sunnyvale, CA

Average rainfall days - Sunnyvale, CA

The month with the highest number of rainy days is March (9.6 days).
The month with the least rainy days is August (0.4 days).

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Average daylight / Average sunshine
Sunnyvale, CA

Average daylight / Average sunshine - Sunnyvale, CA

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.9h).

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Average sunshine days
Sunnyvale, CA

Average sunshine days - Sunnyvale, CA

The month with the most sunshine days is August (30.1 days).
The month with the least sunshine days is March (19.9 days).

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Average visibility
Sunnyvale, CA

Average visibility - Sunnyvale, CA

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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