Monthly weather forecast and climate
Cupertino, CA

Weather in January

January, like December, is a moderate winter month in Cupertino, California, with average temperature ranging between max 58.5°F (14.7°C) and min 44.6°F (7°C). In Cupertino, the average high-temperature is almost the same as in December - a still mild 58.5°F (14.7°C). Weather in January »

Weather in February

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

Weather in March

March, the first month of the spring, in Cupertino, is an enjoyable month, with average temperature ranging between min 44.2°F (6.8°C) and max 61.7°F (16.5°C). In March, the average high-temperature is essentially the same as in February - an enjoyable 61.7°F (16.5°C). Weather in March »

Weather in April

April, like March, in Cupertino, California, is another comfortable spring month, with average temperature fluctuating between 46°F (7.8°C) and 65.7°F (18.7°C). In April, the average high-temperature is relatively the same as in March - a still enjoyable 65.7°F (18.7°C). Weather in April »

Weather in May

May, the last month of the spring, in Cupertino, is a pleasant month, with average temperature fluctuating between 69.3°F (20.7°C) and 48.9°F (9.4°C). In Cupertino, the average high-temperature is relatively the same as in April - a pleasant 69.3°F (20.7°C). Weather in May »

Weather in June

June, the first month of the summer, in Cupertino, is a warm month, with average temperature ranging between max 75.7°F (24.3°C) and min 52.7°F (11.5°C). In Cupertino, the average high-temperature in June slightly increases, from a pleasant 69.3°F (20.7°C) in May, to a warm 75.7°F (24.3°C). Weather in June »

Weather in July

July, like June, in Cupertino, California, is a moderately hot summer month, with average temperature ranging between min 55°F (12.8°C) and max 79.3°F (26.3°C). July is the warmest month, with an average high-temperature of 79.3°F (26.3°C) and an average low-temperature of 55°F (12.8°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Cupertino, California, with average temperature varying between 79.2°F (26.2°C) and 56.1°F (13.4°C). In August, the average high-temperature is almost the same as in July - a still moderately hot 79.2°F (26.2°C). Weather in August »

Weather in September

September, the first month of the autumn, in Cupertino, is also a moderately hot month, with average temperature fluctuating between 55.8°F (13.2°C) and 77.5°F (25.3°C). In September, the average high-temperature is almost the same as in August - a still moderately hot 77.5°F (25.3°C). Weather in September »

Weather in October

October, like September, is an agreeable autumn month in Cupertino, California, with average temperature fluctuating between 53.8°F (12.1°C) and 71.6°F (22°C). In October, the average high-temperature slightly decreases, from a moderately hot 77.5°F (25.3°C) in September, to an agreeable 71.6°F (22°C). Weather in October »

Weather in November

November, the last month of the autumn, in Cupertino, is another comfortable month, with temperature in the range of an average high of 63.9°F (17.7°C) and an average low of 48.4°F (9.1°C). In Cupertino, the average high-temperature slightly decreases, from a pleasant 71.6°F (22°C) in October, to an enjoyable 63.9°F (17.7°C). Weather in November »

Weather in December

The first month of the winter, December, is still a mild month in Cupertino, California, with average temperature ranging between max 57°F (13.9°C) and min 44.4°F (6.9°C). December is the coldest month, with an average high-temperature of 57°F (13.9°C) and an average low-temperature of 44.4°F (6.9°C). Weather in December »
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FAQ

How much does it rain in Cupertino?

In Cupertino, during the entire year, the rain falls for 53.6 days and collects up to 5.39" (137mm) of precipitation.

When is the lowest UV index in Cupertino?

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

What is the rainiest month in Cupertino?

February is the month with the most rainfall in Cupertino, California. Rain falls for 6 days and accumulates 1.02" (26mm) of precipitation.

What is the most humid month in Cupertino?

March is the most humid month, with an average relative humidity of 74%.

When are the longest days in Cupertino?

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

What is the month with the highest UV index in Cupertino?

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

What is the warmest month in Cupertino?

With an average high-temperature of 79.3°F (26.3°C) and an average low-temperature of 55°F (12.8°C), July is the warmest month.

What are the least humid months in Cupertino?

Months with the lowest humidity in Cupertino, California, are July, September and October, with an average relative humidity of 64%.

What is the driest month in Cupertino?

Months with the least rainfall are July and August Rain falls for 1.3 days and accumulates 0.04" (1mm) of rain.

What is the month with the most sunshine in Cupertino?

July and August, with an average of 12h of sunshine, are months with the most sunshine in Cupertino.

What is the coldest month in Cupertino?

With an average high-temperature of 57°F (13.9°C) and an average low-temperature of 44.4°F (6.9°C), December is the coldest month.

What is the month with the shortest days in Cupertino?

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

What is the month with the least sunshine in Cupertino?

With an average of 5.9h of sunshine, December has the least sunshine of the year.

Average temperature
Cupertino, CA

Average temperature - Cupertino, CA

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is December (57°F).

The month with the highest average low temperature is August (56.1°F).
The coldest months (with the lowest average low temperature) are February and March (44.2°F).

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Average pressure
Cupertino, CA

Average pressure - Cupertino, CA

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

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Average wind speed
Cupertino, CA

Average wind speed - Cupertino, 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
Cupertino, CA

Average humidity - Cupertino, CA

The month with the highest relative humidity is March (74%).
Months with the lowest relative humidity are July, September and October (64%).

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Average rainfall
Cupertino, CA

Average rainfall - Cupertino, CA

The wettest month (with the highest rainfall) is February (1.02").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days
Cupertino, CA

Average rainfall days - Cupertino, CA

The month with the highest number of rainy days is March (9 days).
The month with the least rainy days is August (0.8 days).

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Average daylight / Average sunshine
Cupertino, CA

Average daylight / Average sunshine - Cupertino, 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).

Months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.9h).

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Average sunshine days
Cupertino, CA

Average sunshine days - Cupertino, CA

The month with the most sunshine days is August (28.5 days).
Months with the least sunshine days are February and March (20.8 days).

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Average visibility
Cupertino, CA

Average visibility - Cupertino, 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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