Monthly weather forecast and climate
Walnut, CA

Weather in January

January, like December, in Walnut, California, is another enjoyable winter month, with average temperature varying between 66°F (18.9°C) and 48.7°F (9.3°C). In January, the average high-temperature is almost the same as in December - a still enjoyable 66°F (18.9°C). Weather in January »

Weather in February

February, the last month of the winter, in Walnut, is another comfortable month, with temperature in the range of an average low of 47.7°F (8.7°C) and an average high of 65.5°F (18.6°C). In Walnut, the average high-temperature in February is essentially the same as in January - a still enjoyable 65.5°F (18.6°C). Weather in February »

Weather in March

The first month of the spring, March, is an agreeable month in Walnut, California, with average temperature varying between 49.3°F (9.6°C) and 69.3°F (20.7°C). In Walnut, California, the average high-temperature is relatively the same as in February - a pleasant 69.3°F (20.7°C). Weather in March »

Weather in April

April, like March, is an agreeable spring month in Walnut, California, with average temperature ranging between min 52.2°F (11.2°C) and max 73.2°F (22.9°C). In April, the average high-temperature is relatively the same as in March - a still agreeable 73.2°F (22.9°C). Weather in April »

Weather in May

May, the last month of the spring, in Walnut, is a moderately hot month, with average temperature varying between 55°F (12.8°C) and 75.7°F (24.3°C). In May, the average high-temperature is almost the same as in April - a warm 75.7°F (24.3°C). Weather in May »

Weather in June

June, the first month of the summer, in Walnut, is still a warm month, with temperature in the range of an average low of 58.8°F (14.9°C) and an average high of 81.7°F (27.6°C). In Walnut, the average high-temperature slightly increases, from 75.7°F (24.3°C) in May, to a still warm 81.7°F (27.6°C). Weather in June »

Weather in July

July in Walnut, California, is a hot summer month, with temperature in the range of an average high of 87.8°F (31°C) and an average low of 64.6°F (18.1°C). In July, the average high-temperature marginally rises, from a moderately hot 81.7°F (27.6°C) in June, to a tropical 87.8°F (31°C). Weather in July »

Weather in August

August, the last month of the summer, in Walnut, is also a hot month, with average temperature ranging between max 89.2°F (31.8°C) and min 66.2°F (19°C). The warmest month is August, with an average high-temperature of 89.2°F (31.8°C) and an average low-temperature of 66.2°F (19°C). The average heat index is evaluated at a tropical 91.9°F (33.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a hot month in Walnut, California, with temperature in the range of an average high of 87.3°F (30.7°C) and an average low of 64.4°F (18°C). In Walnut, the average high-temperature is practically the same as in August - a still hot 87.3°F (30.7°C). Weather in September »

Weather in October

October, like September, in Walnut, California, is a moderately hot autumn month, with average temperature fluctuating between 59.5°F (15.3°C) and 79.3°F (26.3°C). In October, the average high-temperature marginally drops, from a tropical 87.3°F (30.7°C) in September, to a warm 79.3°F (26.3°C). Weather in October »

Weather in November

November, the last month of the autumn, in Walnut, is also an agreeable month, with average temperature varying between 71.8°F (22.1°C) and 53.6°F (12°C). In November, the average high-temperature marginally drops, from a moderately hot 79.3°F (26.3°C) in October, to an agreeable 71.8°F (22.1°C). Weather in November »

Weather in December

The first month of the winter, December, is also an enjoyable month in Walnut, California, with average temperature ranging between max 63.7°F (17.6°C) and min 47.7°F (8.7°C). December is the coldest month, with an average high-temperature of 63.7°F (17.6°C) and an average low-temperature of 47.7°F (8.7°C). Weather in December »
[Resources]

FAQ

How much does it rain in Walnut?

In Walnut, during the entire year, the rain falls for 43.1 days and collects up to 6.89" (175mm) of precipitation.

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

Months with the lowest UV index in Walnut are January, February, November and December, with an average maximum UV index of 4.

What is the month with the least sunshine in Walnut?

The month with the least sunshine is February, with an average of 6.8h of sunshine.

What are the most humid months in Walnut?

May and June, with an average relative humidity of 56%, are most humid months in Walnut.

What is the driest month in Walnut?

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

When are the longest days in Walnut?

With an average of 14.4h of daylight, June has the longest days of the year in Walnut.

What month has the most sunshine in Walnut?

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

When is the highest UV index in Walnut?

Months with the highest UV index in Walnut are July and August, with an average maximum UV index of 7.

What is the warmest month in Walnut?

The warmest month in Walnut is August, with an average high-temperature of 89.2°F (31.8°C) and an average low-temperature of 66.2°F (19°C).

What is the least humid month in Walnut?

The least humid month is November, with an average relative humidity of 45%.

What is the coldest month in Walnut?

December is the coldest month in Walnut, California, with an average high-temperature of 63.7°F (17.6°C) and an average low-temperature of 47.7°F (8.7°C).

What is the wettest month in Walnut?

December is the month with the most rainfall in Walnut. Rain falls for 5.4 days and accumulates 1.57" (40mm) of precipitation.

What is the month with the shortest days in Walnut?

The month with the shortest days is December, with an average of 9.9h of daylight.

Average temperature
Walnut, CA

Average temperature - Walnut, CA

The warmest month (with the highest average high temperature) is August (89.2°F).
The month with the lowest average high temperature is December (63.7°F).

The month with the highest average low temperature is August (66.2°F).
The coldest months (with the lowest average low temperature) are February and December (47.7°F).

[Resources]

Average pressure
Walnut, CA

Average pressure - Walnut, CA

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.87").

[Resources]

Average wind speed
Walnut, CA

Average wind speed - Walnut, CA

The windiest months (with the highest average wind speed) are April and May (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

[Resources]

Average rainfall
Walnut, CA

Average rainfall - Walnut, CA

The wettest month (with the highest rainfall) is December (1.57").
The driest months (with the least rainfall) are June and August (0.04").

[Resources]

Average rainfall days
Walnut, CA

Average rainfall days - Walnut, CA

The month with the highest number of rainy days is March (6.6 days).
The month with the least rainy days is June (1 days).

[Resources]

Average daylight / Average sunshine
Walnut, CA

Average daylight / Average sunshine - Walnut, CA

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is February (Average sunshine: 6.8h).

[Resources]

Average sunshine days
Walnut, CA

Average sunshine days - Walnut, CA

The month with the most sunshine days is June (28.6 days).
The month with the least sunshine days is February (22 days).

[Resources]

Average UV index
Walnut, CA

Average UV index - Walnut, CA

Months with the highest UV index are July and August (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 4).

[Resources]

Average visibility
Walnut, CA

Average visibility - Walnut, 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).

[Resources]