Climate and monthly weather forecast
Walnut Creek, CA

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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 an average temperature ranging between max 56.8°F (13.8°C) and min 42.4°F (5.8°C). The transition into January is marked with an average high-temperature of a still refreshing 56.8°F (13.8°C), showing an insignificant shift from December's 55.4°F (13°C). Weather in January »

Weather in February

February, the last month of the winter in Walnut Creek, is another mild month, with an average temperature ranging between min 43.2°F (6.2°C) and max 59.7°F (15.4°C). Upon the onset of February, Walnut Creek witnesses an average high-temperature of a still refreshing 59.7°F (15.4°C), showing a close resemblance to the prior month. Weather in February »

Weather in March

March, the first month of the spring in Walnut Creek, is an enjoyable month, with an average temperature varying between 44.8°F (7.1°C) and 62.8°F (17.1°C). The arrival of March sees a recorded average high-temperature of an enjoyable 62.8°F (17.1°C), showing little divergence from the previous month's conditions. Weather in March »

Weather in April

April in Walnut Creek, California, is an agreeable spring month, with an average temperature ranging between min 46.4°F (8°C) and max 68°F (20°C). The transition into April is marked with an average high-temperature of an agreeable 68°F (20°C), showing an insignificant shift from March's 62.8°F (17.1°C). Weather in April »

Weather in May

The last month of the spring, May, is another pleasant month in Walnut Creek, California, with an average temperature varying between 50.2°F (10.1°C) and 72.3°F (22.4°C). May brings an average high-temperature of a still pleasant 72.3°F (22.4°C), showing a slight difference from April's 68°F (20°C). Weather in May »

Weather in June

June, the first month of the summer in Walnut Creek, is a moderately hot month, with an average temperature varying between 79.9°F (26.6°C) and 54.5°F (12.5°C). June's onset witnesses a minor shift in the average high-temperature, moving from a pleasant 72.3°F (22.4°C) in May to a warm 79.9°F (26.6°C). Weather in June »

Weather in July

July, like June, in Walnut Creek, California, is another warm summer month, with an average temperature fluctuating between 56.1°F (13.4°C) and 82.8°F (28.2°C). July, noted for its average high-temperature of 82.8°F (28.2°C) and an average low-temperature of 56.1°F (13.4°C), is considered the warmest month. For most parts of July, the heat index is calculated to be a hot 86°F (30°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Walnut Creek, California, with temperature in the range of an average low of 56.8°F (13.8°C) and an average high of 81.7°F (27.6°C). The initiation of August records an average high-temperature of a still moderately hot 81.7°F (27.6°C), displaying a near consistency with the previous month. Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Walnut Creek, California, with an average temperature fluctuating between 57.2°F (14°C) and 81.5°F (27.5°C). The advent of September denotes an average high-temperature of a still moderately hot 81.5°F (27.5°C), subtly different from August's 81.7°F (27.6°C). Weather in September »

Weather in October

October, like September, in Walnut Creek, California, is a moderately hot autumn month, with an average temperature ranging between max 74.1°F (23.4°C) and min 54.3°F (12.4°C). In Walnut Creek, the average high-temperature in October slightly decreases from 81.5°F (27.5°C) in September to a still warm 74.1°F (23.4°C). Weather in October »

Weather in November

November, the last month of the autumn in Walnut Creek, is another refreshing month, with temperature in the range of an average low of 47.5°F (8.6°C) and an average high of 64°F (17.8°C). The arrival of November corresponds with a temperature reduction, down from October's warm 74.1°F (23.4°C) to a comfortable 64°F (17.8°C). Weather in November »

Weather in December

The first month of the winter, December, is still a refreshing month in Walnut Creek, California, with an average temperature fluctuating between 55.4°F (13°C) and 42.4°F (5.8°C). In Walnut Creek, California, the lowest average temperatures are observed in December, with a high of 55.4°F (13°C) and a low of 42.4°F (5.8°C). Weather in December »

Frequently asked questions

How many days does it rain in Walnut Creek?

In Walnut Creek, California, during the entire year, the rain falls for 68.7 days and collects up to 11.26" (286mm) of precipitation.

When is the lowest UV index in Walnut Creek?

The months with the lowest UV index in Walnut Creek, California, are January, February, November and December, with an average maximum UV index of 3.

What is the wettest month in Walnut Creek?

The month with the most rainfall is February, when the rain falls for 8.3 days and typically aggregates up to 2.4" (61mm) of precipitation.

What is the most humid month in Walnut Creek?

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

When is Daylight Saving Time (DST) in Walnut Creek?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Walnut Creek, 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 Walnut Creek?

With an average of 14h and 48min of daylight, June has the longest days of the year in Walnut Creek.

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.

What part of the year is the hottest in Walnut Creek?

July is Walnut Creek's warmest month, registering average high temperatures of 82.8°F (28.2°C) and lows of 56.1°F (13.4°C).

What is the driest month in Walnut Creek?

The months with the least rainfall in Walnut Creek, California, are July and August Rain falls for 1.4 days and accumulates 0.04" (1mm) of rain.

What month has the most sunshine in Walnut Creek?

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

What are the least humid months in Walnut Creek?

The months with the lowest humidity are September and October, with an average relative humidity of 58%.

What are the coldest months in Walnut Creek?

December, with its high-temperature average of 55.4°F (13°C) and a low-temperature average of 42.4°F (5.8°C), is the coldest month.

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

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

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

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

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).

Average pressure
Walnut Creek, CA

Average pressure - Walnut Creek, CA

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

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).

Average humidity
Walnut Creek, CA

Average humidity - Walnut Creek, CA

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

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").

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).

Average daylight / Average sunshine
Walnut Creek, CA

Average daylight / Average sunshine - Walnut Creek, CA

The month with the longest days is June (Average daylight: 14h and 48min).
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 0min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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).

Average UV index
Walnut Creek, CA

Average UV index - Walnut Creek, CA

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

Average visibility
Walnut Creek, CA

Average visibility - Walnut Creek, 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).

Walnut Creek, California, USA

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