Monthly weather forecast and climate
Walnut Creek, CA

Vast fields and forest slopes of the iconic Mount Diablo State Park within the Walnut Creek in California
Vast fields and forest slopes of the iconic Mount Diablo State Park within the Walnut Creek in California

Weather in January

January, like December, is another mild winter month in Walnut Creek, California, with average temperature ranging between max 56.8°F (13.8°C) and min 42.4°F (5.8°C). In Walnut Creek, 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 Walnut Creek, California, with temperature in the range of an average high of 59.7°F (15.4°C) and an average low of 43.2°F (6.2°C). In Walnut Creek, the average high-temperature is almost the same as in January - a still mild 59.7°F (15.4°C). Weather in February »

Weather in March

March, the first month of the spring, in Walnut Creek, is a comfortable month, with average temperature ranging between min 44.8°F (7.1°C) and max 62.8°F (17.1°C). In March, the average high-temperature is essentially the same as in February - an enjoyable 62.8°F (17.1°C). Weather in March »

Weather in April

April in Walnut Creek, California, is a pleasant spring month, with temperature in the range of an average high of 68°F (20°C) and an average low of 46.4°F (8°C). In April, the average high-temperature is essentially the same as in March - a pleasant 68°F (20°C). Weather in April »

Weather in May

The last month of the spring, May, is also an agreeable month in Walnut Creek, California, with average temperature ranging between max 72.3°F (22.4°C) and min 50.2°F (10.1°C). In May, the average high-temperature is relatively the same as in April - a still agreeable 72.3°F (22.4°C). Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in Walnut Creek, California, with average temperature ranging between min 54.5°F (12.5°C) and max 79.9°F (26.6°C). In June, the average high-temperature marginally rises, from an agreeable 72.3°F (22.4°C) in May, to a warm 79.9°F (26.6°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Walnut Creek, California, with average temperature ranging between min 56.1°F (13.4°C) and max 82.8°F (28.2°C). July is the warmest month, with an average high-temperature of 82.8°F (28.2°C) and an average low-temperature of 56.1°F (13.4°C). The average heat index in July is calculated to 85.5°F (29.7°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Walnut Creek, California, with average temperature ranging between min 56.8°F (13.8°C) and max 81.7°F (27.6°C). In August, the average high-temperature is essentially the same as in July - a still warm 81.7°F (27.6°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Walnut Creek, California, with average temperature varying between 57.2°F (14°C) and 81.5°F (27.5°C). In September, the average high-temperature is essentially the same as in August - a still moderately hot 81.5°F (27.5°C). Weather in September »

Weather in October

October, the same as September, is another warm autumn month in Walnut Creek, California, with average temperature varying between 74.1°F (23.4°C) and 54.3°F (12.4°C). In October, the average high-temperature marginally drops, from 81.5°F (27.5°C) in September, to a still moderately hot 74.1°F (23.4°C). Weather in October »

Weather in November

The last month of the autumn, November, is another comfortable month in Walnut Creek, California, with average temperature varying between 64°F (17.8°C) and 47.5°F (8.6°C). In November, the average high-temperature decreases, from a moderately hot 74.1°F (23.4°C) in October, to a comfortable 64°F (17.8°C). Weather in November »

Weather in December

December, the first month of the winter, in Walnut Creek, is also a moderate month, with temperature in the range of an average high of 55.4°F (13°C) and an average low of 42.4°F (5.8°C). The coldest month is December, with an average high-temperature of 55.4°F (13°C) and an average low-temperature of 42.4°F (5.8°C). Weather in December »
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FAQ

How many days does it rain in Walnut Creek?

Throughout the year, there are 68.7 rainfall days, and 11.26" (286mm) of precipitation is accumulated.

When is the lowest UV index in Walnut Creek?

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

What is the wettest month in Walnut Creek?

February is the month with the most rainfall in Walnut Creek. Rain falls for 8.3 days and accumulates 2.4" (61mm) of precipitation.

What is the most humid month in Walnut Creek?

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

When are the longest days in Walnut Creek?

The month with the longest days is June, with an average of 14.8h of daylight.

What are the months with the highest UV index in Walnut Creek?

June and July, with an average maximum UV index of 6, are months with the highest UV index in Walnut Creek.

What is the warmest month in Walnut Creek?

With an average high-temperature of 82.8°F (28.2°C) and an average low-temperature of 56.1°F (13.4°C), July is the warmest month.

What is the driest month in Walnut Creek?

July and August are months with the least rain in Walnut Creek, California, when the rain falls for 1.4 days and typically aggregates up to 0.04" (1mm) of rain.

What month has the most sunshine in Walnut Creek?

July has the most sunshine of the year, with an average of 12h of sunshine.

What is the least humid month in Walnut Creek?

Months with the lowest humidity in Walnut Creek, California, are September and October, with an average relative humidity of 58%.

What is the coldest month in Walnut Creek?

The coldest month in Walnut Creek, California, is December, with an average high-temperature of 55.4°F (13°C) and an average low-temperature of 42.4°F (5.8°C).

What is the month with the shortest days in Walnut Creek?

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

What is the month with the least sunshine in Walnut Creek?

With an average of 5.8h of sunshine, December has the least sunshine of the year.

Average temperature
Walnut Creek, CA

Average temperature - Walnut Creek, CA

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is December (55.4°F).

The month with the highest average low temperature is September (57.2°F).
The coldest months (with the lowest average low temperature) are January and December (42.4°F).

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Average pressure
Walnut Creek, CA

Average pressure - Walnut Creek, CA

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed
Walnut Creek, CA

Average wind speed - Walnut Creek, CA

The windiest month (with the highest average wind speed) is May (7.3mph).
The calmest month (with the lowest average wind speed) is November (4.4mph).

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Average humidity
Walnut Creek, CA

Average humidity - Walnut Creek, CA

The month with the highest relative humidity is March (74%).
Months with the lowest relative humidity are September and October (58%).

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Average rainfall
Walnut Creek, CA

Average rainfall - Walnut Creek, CA

The wettest month (with the highest rainfall) is February (2.4").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days
Walnut Creek, CA

Average rainfall days - Walnut Creek, CA

The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (0.8 days).

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Average daylight / Average sunshine
Walnut Creek, CA

Average daylight / Average sunshine - Walnut Creek, CA

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days
Walnut Creek, CA

Average sunshine days - Walnut Creek, CA

The month with the most sunshine days is August (29.6 days).
The month with the least sunshine days is March (17.5 days).

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Average UV index
Walnut Creek, CA

Average UV index - Walnut Creek, CA

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

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Average visibility
Walnut Creek, CA

Average visibility - Walnut Creek, 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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