Monthly weather forecast and climate
San Geronimo, CA

Weather in January

January in San Geronimo, California, is a moderate winter month, with average temperature varying between 55.9°F (13.3°C) and 46.6°F (8.1°C). In San Geronimo, California, the average high-temperature in January is almost the same as in December - a moderate 55.9°F (13.3°C). Weather in January »

Weather in February

The last month of the winter, February, is another mild month in San Geronimo, California, with average temperature varying between 46.8°F (8.2°C) and 57.4°F (14.1°C). In San Geronimo, the average high-temperature is almost the same as in January - a still mild 57.4°F (14.1°C). Weather in February »

Weather in March

March, the first month of the spring, in San Geronimo, is also a moderate month, with temperature in the range of an average high of 59.2°F (15.1°C) and an average low of 47.8°F (8.8°C). In March, the average high-temperature is relatively the same as in February - a still mild 59.2°F (15.1°C). Weather in March »

Weather in April

April in San Geronimo, California, is an enjoyable spring month, with average temperature varying between 48.7°F (9.3°C) and 61.7°F (16.5°C). In April, the average high-temperature is practically the same as in March - an enjoyable 61.7°F (16.5°C). Weather in April »

Weather in May

May, the last month of the spring, in San Geronimo, is also an enjoyable month, with average temperature varying between 63.3°F (17.4°C) and 50.7°F (10.4°C). In San Geronimo, the average high-temperature in May is relatively the same as in April - a still comfortable 63.3°F (17.4°C). Weather in May »

Weather in June

The first month of the summer, June, is still a comfortable month in San Geronimo, California, with temperature in the range of an average low of 53.8°F (12.1°C) and an average high of 67.8°F (19.9°C). In June, the average high-temperature is relatively the same as in May - a still comfortable 67.8°F (19.9°C). Weather in June »

Weather in July

July in San Geronimo, California, is a pleasant summer month, with average temperature varying between 68.5°F (20.3°C) and 54.9°F (12.7°C). In July, the average high-temperature is practically the same as in June - a pleasant 68.5°F (20.3°C). Weather in July »

Weather in August

The last month of the summer, August, is also an agreeable month in San Geronimo, California, with average temperature varying between 56.1°F (13.4°C) and 69.4°F (20.8°C). In San Geronimo, California, the average high-temperature in August is essentially the same as in July - a still agreeable 69.4°F (20.8°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a pleasant month in San Geronimo, California, with average temperature varying between 70.9°F (21.6°C) and 56.3°F (13.5°C). With an average high-temperature of 70.9°F (21.6°C) and an average low-temperature of 56.3°F (13.5°C), September is the warmest month. Weather in September »

Weather in October

October, like September, in San Geronimo, California, is another enjoyable autumn month, with temperature in the range of an average high of 67.5°F (19.7°C) and an average low of 54.7°F (12.6°C). In October, the average high-temperature is relatively the same as in September - a comfortable 67.5°F (19.7°C). Weather in October »

Weather in November

November, the last month of the autumn, in San Geronimo, is another comfortable month, with temperature in the range of an average low of 50.2°F (10.1°C) and an average high of 61.2°F (16.2°C). In November, the average high-temperature slightly decreases, from an enjoyable 67.5°F (19.7°C) in October, to a still comfortable 61.2°F (16.2°C). Weather in November »

Weather in December

December, the first month of the winter, in San Geronimo, is still a cool month, with average temperature varying between 55.2°F (12.9°C) and 46°F (7.8°C). December is the coldest month, with an average high-temperature of 55.2°F (12.9°C) and an average low-temperature of 46°F (7.8°C). Weather in December »
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FAQ

How many days does it rain in San Geronimo?

In San Geronimo, California, during the entire year, the rain falls for 80.3 days and collects up to 15.98" (406mm) of precipitation.

How many days does it snow in San Geronimo?

Throughout the year, there are 0.1 snowfall days.

When it does not snow in San Geronimo?

January through November are months without snowfall in San Geronimo, California.

What is the wettest month in San Geronimo?

The month with the most rainfall in San Geronimo, California, is February when the rain falls for 8.9 days and typically aggregates up to 3.43" (87mm) of precipitation.

What is the month with the lowest UV index in San Geronimo?

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

When are the longest days in San Geronimo?

June has the longest days of the year in San Geronimo, California, with an average of 14.8h of daylight.

What is the month with the highest UV index in San Geronimo?

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

What is the driest month in San Geronimo?

Months with the least rainfall in San Geronimo, California, are July and August Rain falls for 2.3 days and accumulates 0.08" (2mm) of rain.

What month has the most sunshine in San Geronimo?

The month with the most sunshine in San Geronimo, California, is July, with an average of 11.2h of sunshine.

What is the most humid month in San Geronimo?

With an average relative humidity of 78%, August is the most humid month.

What is the warmest month in San Geronimo?

With an average high-temperature of 70.9°F (21.6°C) and an average low-temperature of 56.3°F (13.5°C), September is the warmest month in San Geronimo, California.

What is the least humid month in San Geronimo?

With an average relative humidity of 69%, October is the least humid month in San Geronimo.

What is the coldest month in San Geronimo?

December is the coldest month, with an average high-temperature of 55.2°F (12.9°C) and an average low-temperature of 46°F (7.8°C).

When does it snow in San Geronimo?

The only month with snowfall is December.

When does it snow the most in San Geronimo?

The month with the most snowfall days in San Geronimo is December when snow falls for 0.1 days.

What is the month with the shortest days in San Geronimo?

The month with the shortest days is December, with an average of 9.6h of daylight.

What is the month with the least sunshine in San Geronimo?

With an average of 5.6h of sunshine, December has the least sunshine of the year.

Average temperature
San Geronimo, CA

Average temperature - San Geronimo, CA

The warmest month (with the highest average high temperature) is September (70.9°F).
The month with the lowest average high temperature is December (55.2°F).

The month with the highest average low temperature is September (56.3°F).
The coldest month (with the lowest average low temperature) is December (46°F).

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Average pressure
San Geronimo, CA

Average pressure - San Geronimo, CA

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed
San Geronimo, CA

Average wind speed - San Geronimo, CA

The windiest months (with the highest average wind speed) are April and May (8.3mph).
The calmest month (with the lowest average wind speed) is November (5.9mph).

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Average humidity
San Geronimo, CA

Average humidity - San Geronimo, CA

The month with the highest relative humidity is August (78%).
The month with the lowest relative humidity is October (69%).

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Average rainfall
San Geronimo, CA

Average rainfall - San Geronimo, CA

The wettest month (with the highest rainfall) is February (3.43").
The driest months (with the least rainfall) are July and August (0.08").

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Average rainfall days
San Geronimo, CA

Average rainfall days - San Geronimo, CA

The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is July (2.3 days).

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Average snowfall days
San Geronimo, CA

Average snowfall days - San Geronimo, CA

The month with the highest number of snowfall days is December (0.1 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight / Average sunshine
San Geronimo, CA

Average daylight / Average sunshine - San Geronimo, 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: 11.2h).
The month with the least sunshine is December (Average sunshine: 5.6h).

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Average sunshine days
San Geronimo, CA

Average sunshine days - San Geronimo, CA

Months with the most sunshine days are June and July (24.8 days).
The month with the least sunshine days is March (16.6 days).

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Average UV index
San Geronimo, CA

Average UV index - San Geronimo, CA

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

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Average visibility
San Geronimo, CA

Average visibility - San Geronimo, 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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