Monthly weather forecast and climate
Westmont, CA

Weather in January

January, like December, in Westmont, California, is another enjoyable winter month, with average temperature varying between 52.3°F (11.3°C) and 65.1°F (18.4°C). In Westmont, the average high-temperature is almost the same as in December - a still enjoyable 65.1°F (18.4°C). Weather in January »

Weather in February

February, the last month of the winter, in Westmont, is another comfortable month, with average temperature ranging between min 51.1°F (10.6°C) and max 64.9°F (18.3°C). In Westmont, the average high-temperature in February is essentially the same as in January - a still comfortable 64.9°F (18.3°C). Weather in February »

Weather in March

The first month of the spring, March, is still a comfortable month in Westmont, California, with average temperature ranging between min 52.7°F (11.5°C) and max 66.6°F (19.2°C). In Westmont, the average high-temperature is almost the same as in February - a still comfortable 66.6°F (19.2°C). Weather in March »

Weather in April

April is a pleasant spring month in Westmont, California, with average temperature fluctuating between 54.5°F (12.5°C) and 68.9°F (20.5°C). In Westmont, California, the average high-temperature is practically the same as in March - an agreeable 68.9°F (20.5°C). Weather in April »

Weather in May

May, the last month of the spring, in Westmont, is another pleasant month, with average temperature fluctuating between 56.8°F (13.8°C) and 70.3°F (21.3°C). In May, the average high-temperature is almost the same as in April - a still pleasant 70.3°F (21.3°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Westmont, California, with average temperature fluctuating between 59.4°F (15.2°C) and 73.4°F (23°C). In June, the average high-temperature is almost the same as in May - a moderately hot 73.4°F (23°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Westmont, California, with temperature in the range of an average low of 63.3°F (17.4°C) and an average high of 78.3°F (25.7°C). In July, the average high-temperature is essentially the same as in June - a still moderately hot 78.3°F (25.7°C). Weather in July »

Weather in August

August, the last month of the summer, in Westmont, is another warm month, with average temperature ranging between min 64.9°F (18.3°C) and max 80.2°F (26.8°C). August is the warmest month, with an average high-temperature of 80.2°F (26.8°C) and an average low-temperature of 64.9°F (18.3°C). Weather in August »

Weather in September

September, the first month of the autumn, in Westmont, is also a moderately hot month, with temperature in the range of an average low of 64.2°F (17.9°C) and an average high of 79.7°F (26.5°C). In September, the average high-temperature is essentially the same as in August - a still moderately hot 79.7°F (26.5°C). Weather in September »

Weather in October

October, like September, in Westmont, California, is another warm autumn month, with average temperature fluctuating between 61.9°F (16.6°C) and 75.7°F (24.3°C). In October, the average high-temperature is practically the same as in September - a still warm 75.7°F (24.3°C). Weather in October »

Weather in November

The last month of the autumn, November, is another pleasant month in Westmont, California, with average temperature fluctuating between 70.2°F (21.2°C) and 57.2°F (14°C). In November, the average high-temperature marginally drops, from a moderately hot 75.7°F (24.3°C) in October, to a pleasant 70.2°F (21.2°C). Weather in November »

Weather in December

December, the first month of the winter, in Westmont, is still a comfortable month, with temperature in the range of an average high of 64°F (17.8°C) and an average low of 51.4°F (10.8°C). The coldest month is December, with an average high-temperature of 64°F (17.8°C) and an average low-temperature of 51.4°F (10.8°C). Weather in December »
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FAQ

How much does it rain in Westmont?

Throughout the year, in Westmont, California, there are 47.6 rainfall days, and 7.24" (184mm) of precipitation is accumulated.

What is the rainiest month in Westmont?

January is the month with the most rainfall. Rain falls for 4.3 days and accumulates 1.42" (36mm) of precipitation.

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

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

What is the most humid month in Westmont?

With an average relative humidity of 70%, June is the most humid month in Westmont, California.

What is the driest month in Westmont?

The month with the least rainfall is June when the rain falls for 1.7 days and typically collects 0.08" (2mm) of precipitation.

When are the longest days in Westmont?

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

What are the months with the highest UV index in Westmont?

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

What are the months with the most sunshine in Westmont?

July and August, with an average of 11.9h of sunshine, are months with the most sunshine in Westmont.

What is the warmest month in Westmont?

The warmest month in Westmont, California, is August, with an average high-temperature of 80.2°F (26.8°C) and an average low-temperature of 64.9°F (18.3°C).

What is the least humid month in Westmont?

The least humid month in Westmont is November, with an average relative humidity of 54%.

What is the coldest month in Westmont?

December is the coldest month in Westmont, with an average high-temperature of 64°F (17.8°C) and an average low-temperature of 51.4°F (10.8°C).

What is the month with the shortest days in Westmont?

With an average of 9.9h of daylight, December has the shortest days of the year.

What is the month with the least sunshine in Westmont?

With an average of 6.7h of sunshine, December has the least sunshine of the year in Westmont.

Average temperature
Westmont, CA

Average temperature - Westmont, CA

The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (64°F).

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (51.1°F).

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Average pressure
Westmont, CA

Average pressure - Westmont, CA

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.89").

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Average wind speed
Westmont, CA

Average wind speed - Westmont, CA

The windiest month (with the highest average wind speed) is April (6.4mph).
The calmest month (with the lowest average wind speed) is September (4.9mph).

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Average rainfall
Westmont, CA

Average rainfall - Westmont, CA

The wettest month (with the highest rainfall) is January (1.42").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days
Westmont, CA

Average rainfall days - Westmont, CA

The month with the highest number of rainy days is March (6.5 days).
The month with the least rainy days is June (1.7 days).

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Average daylight / Average sunshine
Westmont, CA

Average daylight / Average sunshine - Westmont, 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).

Months with the most sunshine are July and August (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days
Westmont, CA

Average sunshine days - Westmont, CA

The month with the most sunshine days is October (25.5 days).
The month with the least sunshine days is June (21.4 days).

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Average UV index
Westmont, CA

Average UV index - Westmont, CA

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 4).

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Average visibility
Westmont, CA

Average visibility - Westmont, 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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