Monthly weather forecast and climate
South Santa Rosa, CA

Weather in January

January, the same as December, in South Santa Rosa, California, is another mild winter month, with average temperature ranging between min 43.2°F (6.2°C) and max 57°F (13.9°C). In January, the average high-temperature is relatively the same as in December - a still moderate 57°F (13.9°C). Weather in January »

Weather in February

February, the last month of the winter, in South Santa Rosa, is also a moderate month, with average temperature fluctuating between 42.6°F (5.9°C) and 58.6°F (14.8°C). In February, the average high-temperature is relatively the same as in January - a still mild 58.6°F (14.8°C). Weather in February »

Weather in March

March, the first month of the spring, in South Santa Rosa, is also a moderate month, with temperature in the range of an average low of 44.1°F (6.7°C) and an average high of 60.4°F (15.8°C). In March, the average high-temperature is relatively the same as in February - a still mild 60.4°F (15.8°C). Weather in March »

Weather in April

April in South Santa Rosa, California, is a comfortable spring month, with average temperature varying between 64.9°F (18.3°C) and 45.5°F (7.5°C). In South Santa Rosa, the average high-temperature in April is almost the same as in March - a comfortable 64.9°F (18.3°C). Weather in April »

Weather in May

The last month of the spring, May, is an agreeable month in South Santa Rosa, California, with average temperature fluctuating between 48.6°F (9.2°C) and 69.3°F (20.7°C). In May, the average high-temperature is almost the same as in April - a pleasant 69.3°F (20.7°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in South Santa Rosa, California, with average temperature varying between 52.9°F (11.6°C) and 76.5°F (24.7°C). In June, the average high-temperature marginally rises, from a pleasant 69.3°F (20.7°C) in May, to a moderately hot 76.5°F (24.7°C). Weather in June »

Weather in July

July, like June, in South Santa Rosa, California, is a moderately hot summer month, with average temperature fluctuating between 79.9°F (26.6°C) and 54.5°F (12.5°C). July and August, with an average high-temperature of 79.9°F (26.6°C), are the warmest months. Weather in July »

Weather in August

The last month of the summer, August, is another warm month in South Santa Rosa, California, with average temperature ranging between max 79.9°F (26.6°C) and min 55°F (12.8°C). July and August, with an average high-temperature of 79.9°F (26.6°C), are the warmest months. Weather in August »

Weather in September

September, the first month of the autumn, in South Santa Rosa, is also a moderately hot month, with average temperature fluctuating between 55°F (12.8°C) and 79.3°F (26.3°C). In South Santa Rosa, the average high-temperature in September is almost the same as in August - a still moderately hot 79.3°F (26.3°C). Weather in September »

Weather in October

October, the same as September, in South Santa Rosa, California, is another pleasant autumn month, with temperature in the range of an average low of 51.8°F (11°C) and an average high of 72.3°F (22.4°C). In South Santa Rosa, the average high-temperature marginally drops, from a moderately hot 79.3°F (26.3°C) in September, to an agreeable 72.3°F (22.4°C). Weather in October »

Weather in November

November, the last month of the autumn, in South Santa Rosa, is another comfortable month, with average temperature ranging between max 63.5°F (17.5°C) and min 46°F (7.8°C). In South Santa Rosa, the average high-temperature slightly decreases, from an agreeable 72.3°F (22.4°C) in October, to a comfortable 63.5°F (17.5°C). Weather in November »

Weather in December

December, the first month of the winter, in South Santa Rosa, is also a moderate month, with average temperature ranging between min 42.4°F (5.8°C) and max 55.6°F (13.1°C). December is the coldest month, with an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 42.4°F (5.8°C). Weather in December »
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FAQ

How many days does it rain in South Santa Rosa?

Throughout the year, in South Santa Rosa, there are 44.3 rainfall days, and 3.78" (96mm) of precipitation is accumulated.

What is the month with the lowest UV index in South Santa Rosa?

Months with the lowest UV index in South Santa Rosa, California, are January, February, November and December, with an average maximum UV index of 3.

What is the wettest month in South Santa Rosa?

The month with the most rainfall in South Santa Rosa is February when the rain falls for 5.3 days and typically aggregates up to 0.91" (23mm) of precipitation.

What is the most humid month in South Santa Rosa?

The most humid month is March, with an average relative humidity of 77%.

What is the driest month in South Santa Rosa?

June through September are months with the least rain in South Santa Rosa, California, when the rain falls for 0.8 days and typically aggregates up to 0.04" (1mm) of rain.

When are the longest days in South Santa Rosa?

With an average of 14.8h of daylight, June has the longest days of the year.

When is the highest UV index in South Santa Rosa?

June is the month with the highest UV index in South Santa Rosa, California, with an average maximum UV index of 6.

What is the warmest month in South Santa Rosa?

July and August, with an average high-temperature of 79.9°F (26.6°C), are warmest months in South Santa Rosa, California.

What month has the most sunshine in South Santa Rosa?

The month with the most sunshine in South Santa Rosa, California, is July, with an average of 11.9h of sunshine.

What is the least humid month in South Santa Rosa?

September is the least humid month in South Santa Rosa, with an average relative humidity of 62%.

What is the coldest month in South Santa Rosa?

December is the coldest month, with an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 42.4°F (5.8°C).

What is the month with the shortest days in South Santa Rosa?

December has the shortest days of the year in South Santa Rosa, with an average of 9.5h of daylight.

What is the month with the least sunshine in South Santa Rosa?

The month with the least sunshine in South Santa Rosa, California, is December, with an average of 5.7h of sunshine.

Average temperature
South Santa Rosa, CA

Average temperature - South Santa Rosa, CA

The warmest months (with the highest average high temperature) are July and August (79.9°F).
The month with the lowest average high temperature is December (55.6°F).

Months with the highest average low temperature are August and September (55°F).
The coldest month (with the lowest average low temperature) is December (42.4°F).

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Average pressure
South Santa Rosa, CA

Average pressure - South Santa Rosa, 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
South Santa Rosa, CA

Average wind speed - South Santa Rosa, CA

The windiest month (with the highest average wind speed) is May (6.8mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).

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Average humidity
South Santa Rosa, CA

Average humidity - South Santa Rosa, CA

The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (62%).

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Average rainfall
South Santa Rosa, CA

Average rainfall - South Santa Rosa, CA

The wettest month (with the highest rainfall) is February (0.91").
The driest months (with the least rainfall) are June, July, August and September (0.04").

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Average rainfall days
South Santa Rosa, CA

Average rainfall days - South Santa Rosa, CA

The month with the highest number of rainy days is March (8.7 days).
The month with the least rainy days is August (0.5 days).

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Average daylight / Average sunshine
South Santa Rosa, CA

Average daylight / Average sunshine - South Santa Rosa, CA

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days
South Santa Rosa, CA

Average sunshine days - South Santa Rosa, CA

The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is March (20.8 days).

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Average UV index
South Santa Rosa, CA

Average UV index - South Santa Rosa, CA

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

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Average visibility
South Santa Rosa, CA

Average visibility - South Santa Rosa, 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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