Monthly weather forecast and climate
Atherton, CA

Weather in January

January, the same as December, in Atherton, California, is a moderate winter month, with average temperature varying between 56.8°F (13.8°C) and 46.4°F (8°C). In Atherton, California, the average high-temperature in January is almost 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 also a moderate month in Atherton, California, with average temperature ranging between max 58.1°F (14.5°C) and min 46°F (7.8°C). In Atherton, the average high-temperature is relatively the same as in January - a still moderate 58.1°F (14.5°C). Weather in February »

Weather in March

March, the first month of the spring, in Atherton, is still a mild month, with average temperature fluctuating between 59.9°F (15.5°C) and 46.9°F (8.3°C). In Atherton, the average high-temperature in March is relatively the same as in February - a still moderate 59.9°F (15.5°C). Weather in March »

Weather in April

April in Atherton, California, is an enjoyable spring month, with temperature in the range of an average high of 62.8°F (17.1°C) and an average low of 48.2°F (9°C). In Atherton, the average high-temperature is almost the same as in March - an enjoyable 62.8°F (17.1°C). Weather in April »

Weather in May

The last month of the spring, May, is another comfortable month in Atherton, California, with average temperature fluctuating between 65.3°F (18.5°C) and 50.2°F (10.1°C). In May, the average high-temperature is almost the same as in April - a still comfortable 65.3°F (18.5°C). Weather in May »

Weather in June

June, the first month of the summer, in Atherton, is an agreeable month, with temperature in the range of an average low of 53.2°F (11.8°C) and an average high of 70.3°F (21.3°C). In June, the average high-temperature is almost the same as in May - a pleasant 70.3°F (21.3°C). Weather in June »

Weather in July

July, the same as June, in Atherton, California, is an agreeable summer month, with temperature in the range of an average low of 54.5°F (12.5°C) and an average high of 73°F (22.8°C). July and August, with an average high-temperature of 73°F (22.8°C), are the warmest months. Weather in July »

Weather in August

The last month of the summer, August, is also an agreeable month in Atherton, California, with average temperature varying between 56.1°F (13.4°C) and 73°F (22.8°C). July and August, with an average high-temperature of 73°F (22.8°C), are the warmest months. Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Atherton, California, with average temperature varying between 56.7°F (13.7°C) and 72.7°F (22.6°C). In Atherton, the average high-temperature is almost the same as in August - a still pleasant 72.7°F (22.6°C). Weather in September »

Weather in October

October, like September, is an agreeable autumn month in Atherton, California, with average temperature varying between 55°F (12.8°C) and 68.5°F (20.3°C). In October, the average high-temperature is essentially the same as in September - a still pleasant 68.5°F (20.3°C). Weather in October »

Weather in November

November, the last month of the autumn, in Atherton, is also an enjoyable month, with average temperature varying between 61.9°F (16.6°C) and 50.7°F (10.4°C). In November, the average high-temperature marginally drops, from an agreeable 68.5°F (20.3°C) in October, to an enjoyable 61.9°F (16.6°C). Weather in November »

Weather in December

December, the first month of the winter, in Atherton, is also a moderate month, with average temperature ranging between max 55.9°F (13.3°C) and min 46.6°F (8.1°C). December is the coldest month, with an average high-temperature of 55.9°F (13.3°C) and an average low-temperature of 46.6°F (8.1°C). Weather in December »
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FAQ

How much does it rain in Atherton?

In Atherton, California, during the entire year, the rain falls for 73.4 days and collects up to 11.89" (302mm) of precipitation.

What is the wettest month in Atherton?

The month with the most rainfall in Atherton is February when the rain falls for 8.8 days and typically aggregates up to 2.36" (60mm) of precipitation.

What is the most humid month in Atherton?

With an average relative humidity of 75%, March is the most humid month in Atherton.

When are the longest days in Atherton?

The month with the longest days in Atherton is June, with an average of 14.7h of daylight.

When is the highest UV index in Atherton?

June through September, with an average maximum UV index of 5, are months with the highest UV index in Atherton.

What are the warmest months in Atherton?

Warmest months in Atherton are July and August, with an average high-temperature of 73°F (22.8°C).

What is the driest month in Atherton?

Months with the least rainfall in Atherton are July and August Rain falls for 1.5 days and accumulates 0.04" (1mm) of rain.

What month has the most sunshine in Atherton?

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

What is the least humid month in Atherton?

The least humid month in Atherton, California, is October, with an average relative humidity of 68%.

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

Months with the lowest UV index in Atherton, California, are November and December, with an average maximum UV index of 3.

What is the coldest month in Atherton?

December is the coldest month in Atherton, California, with an average high-temperature of 55.9°F (13.3°C) and an average low-temperature of 46.6°F (8.1°C).

What is the month with the shortest days in Atherton?

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

What is the month with the least sunshine in Atherton?

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

Average temperature
Atherton, CA

Average temperature - Atherton, CA

The warmest months (with the highest average high temperature) are July and August (73°F).
The month with the lowest average high temperature is December (55.9°F).

The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is February (46°F).

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Average pressure
Atherton, CA

Average pressure - Atherton, CA

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is September (29.92").

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Average wind speed
Atherton, CA

Average wind speed - Atherton, CA

The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.5mph).

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Average rainfall
Atherton, CA

Average rainfall - Atherton, CA

The wettest month (with the highest rainfall) is February (2.36").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days
Atherton, CA

Average rainfall days - Atherton, CA

The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (0.8 days).

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Average daylight / Average sunshine
Atherton, CA

Average daylight / Average sunshine - Atherton, CA

The month with the longest days is June (Average daylight: 14.7h).
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
Atherton, CA

Average sunshine days - Atherton, CA

The month with the most sunshine days is August (27.6 days).
The month with the least sunshine days is March (17.5 days).

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Average UV index
Atherton, CA

Average UV index - Atherton, CA

Months with the highest UV index are June, July, August and September (UV index 5).
Months with the lowest UV index are November and December (UV index 3).

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Average visibility
Atherton, CA

Average visibility - Atherton, 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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