Climate and monthly weather forecast
Diablo, CA

Weather in January

January, like December, is a moderate winter month in Diablo, California, with an average temperature varying between 42.1°F (5.6°C) and 56.8°F (13.8°C). In January, the average high-temperature is practically the same as in December - a still mild 56.8°F (13.8°C). Weather in January »

Weather in February

The last month of the winter, February, is another mild month in Diablo, California, with an average temperature fluctuating between 42.6°F (5.9°C) and 59.7°F (15.4°C). In February, the average high-temperature is essentially 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 Diablo, California, with an average temperature varying between 63°F (17.2°C) and 43.5°F (6.4°C). In Diablo, the average high-temperature in March is practically the same as in February - a comfortable 63°F (17.2°C). Weather in March »

Weather in April

April in Diablo, California, is a pleasant spring month, with an average temperature fluctuating between 68°F (20°C) and 45.7°F (7.6°C). In April, the average high-temperature is relatively the same as in March - a pleasant 68°F (20°C). Weather in April »

Weather in May

May, the last month of the spring in Diablo, is another pleasant month, with an average temperature varying between 72.7°F (22.6°C) and 48.7°F (9.3°C). In May, the average high-temperature is relatively the same as in April - a still pleasant 72.7°F (22.6°C). Weather in May »

Weather in June

June, the first month of the summer in Diablo, is a warm month, with an average temperature ranging between max 80.2°F (26.8°C) and min 53.8°F (12.1°C). In Diablo, the average high-temperature in June slightly increases from a pleasant 72.7°F (22.6°C) in May to a moderately hot 80.2°F (26.8°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Diablo, California, with an average temperature fluctuating between 83.8°F (28.8°C) and 55.2°F (12.9°C). July is the warmest month, with an average high-temperature of 83.8°F (28.8°C) and an average low-temperature of 55.2°F (12.9°C). The average heat index in July is calculated to be a hot 86°F (30°C). Weather in July »

Weather in August

August, the last month of the summer in Diablo, is also a moderately hot month, with an average temperature varying between 82.9°F (28.3°C) and 56.7°F (13.7°C). In Diablo, the average high-temperature in August is essentially the same as in July - a still warm 82.9°F (28.3°C). Weather in August »

Weather in September

September, the first month of the autumn in Diablo, is also a moderately hot month, with an average temperature fluctuating between 56.7°F (13.7°C) and 82°F (27.8°C). In Diablo, the average high-temperature in September is relatively the same as in August - a still moderately hot 82°F (27.8°C). Weather in September »

Weather in October

October, like September, in Diablo, California, is a moderately hot autumn month, with temperature in the range of an average low of 53.8°F (12.1°C) and an average high of 74.3°F (23.5°C). In Diablo, the average high-temperature in October marginally drops from 82°F (27.8°C) in September to a still moderately hot 74.3°F (23.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Diablo, is also an enjoyable month, with an average temperature varying between 64°F (17.8°C) and 46.9°F (8.3°C). In November, the average high-temperature decreases from a moderately hot 74.3°F (23.5°C) in October to an enjoyable 64°F (17.8°C). Weather in November »

Weather in December

The first month of the winter, December, is still a mild month in Diablo, California, with an average temperature varying between 55.8°F (13.2°C) and 42.3°F (5.7°C). December is the coldest month, with an average high-temperature of 55.8°F (13.2°C) and an average low-temperature of 42.3°F (5.7°C). Weather in December »
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FAQ

How much does it rain in Diablo?

Throughout the year, in Diablo, California, there are 65.6 rainfall days, and 11.22" (285mm) of precipitation is accumulated.

What is the month with the lowest UV index in Diablo?

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 Diablo?

February is the month with the most rainfall. Rain falls for 8 days and accumulates 2.36" (60mm) of precipitation.

What is the most humid month in Diablo?

The most humid month in Diablo is March, with an average relative humidity of 74%.

When is Daylight Saving Time (DST) in Diablo?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from PDT to PST.

When are the longest days in Diablo?

June has the longest days of the year, with an average of 14h and 44min of daylight.

When is the highest UV index in Diablo?

The months with the highest UV index are June through August, with an average maximum UV index of 6.

What is the warmest month in Diablo?

July is the warmest month in Diablo, California, with an average high-temperature of 83.8°F (28.8°C) and an average low-temperature of 55.2°F (12.9°C).

What is the driest month in Diablo?

July and August are months without rainfall in Diablo.

What month has the most sunshine in Diablo?

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

What is the least humid month in Diablo?

With an average relative humidity of 57%, September is the least humid month.

When does it rain in Diablo?

Months with rainfall are January through June, September through December.

What is the coldest month in Diablo?

December is the coldest month in Diablo, California, with an average high-temperature of 55.8°F (13.2°C) and an average low-temperature of 42.3°F (5.7°C).

What is the month with the shortest days in Diablo?

With an average of 9h and 36min of daylight, December has the shortest days of the year.

What is the month with the least sunshine in Diablo?

The month with the least sunshine in Diablo, California, is December, with an average of 5.8h of sunshine.

Average temperature
Diablo, CA

Average temperature - Diablo, CA

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (55.8°F).

The months with the highest average low temperature are August and September (56.7°F).
The coldest month (with the lowest average low temperature) is January (42.1°F).

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Average pressure
Diablo, CA

Average pressure - Diablo, CA

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).

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Average wind speed
Diablo, CA

Average wind speed - Diablo, CA

The windiest month (with the highest average wind speed) is May (6.9mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).

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Average rainfall
Diablo, CA

Average rainfall - Diablo, CA

The wettest month (with the highest rainfall) is February (2.36").
The driest months (with the least rainfall) are July and August (0").

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Average rainfall days
Diablo, CA

Average rainfall days - Diablo, CA

The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (0.6 days).

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Average daylight / Average sunshine
Diablo, CA

Average daylight / Average sunshine - Diablo, CA

The month with the longest days is June (Average daylight: 14h and 44min).
The month with the shortest days is December (Average daylight: 9h and 36min).

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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Average sunshine days
Diablo, CA

Average sunshine days - Diablo, CA

The month with the most sunshine days is July (30.2 days).
The month with the least sunshine days is March (17.6 days).

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Average UV index
Diablo, CA

Average UV index - Diablo, CA

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average visibility
Diablo, CA

Average visibility - Diablo, CA

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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