Monthly weather forecast and climate
Swansea, CA

Weather in January

January, like December, is another chilly winter month in Swansea, California, with average temperature varying between 48.4°F (9.1°C) and 33.1°F (0.6°C). In Swansea, the average high-temperature in January is practically the same as in December - a still frosty 48.4°F (9.1°C). Weather in January »

Weather in February

February, the last month of the winter, in Swansea, is another chilly month, with temperature in the range of an average high of 49.6°F (9.8°C) and an average low of 34.2°F (1.2°C). In Swansea, California, the average high-temperature is essentially the same as in January - a still frosty 49.6°F (9.8°C). Weather in February »

Weather in March

March, the first month of the spring, in Swansea, is a fresh month, with average temperature fluctuating between 54.9°F (12.7°C) and 38.5°F (3.6°C). In Swansea, the average high-temperature in March is relatively the same as in February - a fresh 54.9°F (12.7°C). Weather in March »

Weather in April

April is a comfortable spring month in Swansea, California, with average temperature varying between 61.7°F (16.5°C) and 44.2°F (6.8°C). In April, the average high-temperature slightly increases, from a fresh 54.9°F (12.7°C) in March, to an enjoyable 61.7°F (16.5°C). Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in Swansea, California, with temperature in the range of an average high of 68.9°F (20.5°C) and an average low of 52.3°F (11.3°C). In May, the average high-temperature marginally rises, from an enjoyable 61.7°F (16.5°C) in April, to a pleasant 68.9°F (20.5°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Swansea, California, with average temperature fluctuating between 62.6°F (17°C) and 81°F (27.2°C). In June, the average high-temperature increases, from a pleasant 68.9°F (20.5°C) in May, to a warm 81°F (27.2°C). Weather in June »

Weather in July

July in Swansea, California, is a hot summer month, with average temperature varying between 69.1°F (20.6°C) and 86°F (30°C). The warmest month is July, with an average high-temperature of 86°F (30°C) and an average low-temperature of 69.1°F (20.6°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Swansea, California, with average temperature varying between 67.6°F (19.8°C) and 85.5°F (29.7°C). In August, the average high-temperature is essentially the same as in July - a warm 85.5°F (29.7°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Swansea, California, with temperature in the range of an average low of 60.3°F (15.7°C) and an average high of 78.1°F (25.6°C). In September, the average high-temperature slightly decreases, from 85.5°F (29.7°C) in August, to a still moderately hot 78.1°F (25.6°C). Weather in September »

Weather in October

October, like September, in Swansea, California, is another enjoyable autumn month, with average temperature ranging between max 67.1°F (19.5°C) and min 49.6°F (9.8°C). In Swansea, California, the average high-temperature in October drops, from a warm 78.1°F (25.6°C) in September, to an enjoyable 67.1°F (19.5°C). Weather in October »

Weather in November

November, the last month of the autumn, in Swansea, is another mild month, with temperature in the range of an average low of 39.2°F (4°C) and an average high of 56.3°F (13.5°C). In Swansea, the average high-temperature decreases, from an enjoyable 67.1°F (19.5°C) in October, to a mild 56.3°F (13.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also a frosty month in Swansea, California, with average temperature varying between 31.5°F (-0.3°C) and 46.9°F (8.3°C). December is the coldest month, with an average high-temperature of 46.9°F (8.3°C) and an average low-temperature of 31.5°F (-0.3°C). Weather in December »
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FAQ

How many days does it rain in Swansea?

In Swansea, California, during the entire year, the rain falls for 48 days and collects up to 4.92" (125mm) of precipitation.

When does it snow in Swansea?

Months with snowfall in Swansea, California, are January through April, November and December.

How much does it snow in Swansea?

In Swansea, during the entire year, snow falls for 4.5 days, and aggregates up to 3.07" (78mm) of snow.

What is the month with the least sunshine in Swansea?

Months with the least sunshine are January, February and December, with an average of 7.3h of sunshine.

When it does not snow in Swansea?

In Swansea, California, snow does not fall in May through October.

What is the driest month in Swansea?

June and September are months with the least rain in Swansea when the rain falls for 2.7 days and typically aggregates up to 0.16" (4mm) of rain.

When are the longest days in Swansea?

With an average of 14.6h of daylight, June has the longest days of the year in Swansea, California.

What month has the most sunshine in Swansea?

The month with the most sunshine is June, with an average of 12.2h of sunshine.

What is the warmest month in Swansea?

With an average high-temperature of 86°F (30°C) and an average low-temperature of 69.1°F (20.6°C), July is the warmest month.

What is the month with the highest UV index in Swansea?

The month with the highest UV index is July, with an average maximum UV index of 7.

What is the least humid month in Swansea?

August is the least humid month in Swansea, California, with an average relative humidity of 19%.

When is the lowest UV index in Swansea?

November and December, with an average maximum UV index of 2, are months with the lowest UV index in Swansea, California.

What is the coldest month in Swansea?

With an average high-temperature of 46.9°F (8.3°C) and an average low-temperature of 31.5°F (-0.3°C), December is the coldest month in Swansea, California.

What is the most humid month in Swansea?

The most humid month is December, with an average relative humidity of 47%.

What is the rainiest month in Swansea?

The month with the most rainfall is December when the rain falls for 5.1 days and typically aggregates up to 0.67" (17mm) of precipitation.

When does it snow the most in Swansea?

December is the month with the most snowfall in Swansea, California. Snow falls for 1.2 days and accumulates 1.18" (30mm) of snow.

What is the month with the shortest days in Swansea?

The month with the shortest days in Swansea, California, is December, with an average of 9.7h of daylight.

Average temperature
Swansea, CA

Average temperature - Swansea, CA

The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is December (46.9°F).

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is December (31.5°F).

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Average pressure
Swansea, CA

Average pressure - Swansea, CA

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.83").

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Average wind speed
Swansea, CA

Average wind speed - Swansea, CA

The windiest months (with the highest average wind speed) are April, May and June (7.6mph).
The calmest month (with the lowest average wind speed) is November (5.8mph).

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Average rainfall
Swansea, CA

Average rainfall - Swansea, CA

The wettest month (with the highest rainfall) is December (0.67").
The driest months (with the least rainfall) are June and September (0.16").

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Average rainfall days
Swansea, CA

Average rainfall days - Swansea, CA

The month with the highest number of rainy days is March (5.7 days).
The month with the least rainy days is September (2.3 days).

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Average snowfall
Swansea, CA

Average snowfall - Swansea, CA

The month with the highest snowfall is December (1.18").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days
Swansea, CA

Average snowfall days - Swansea, CA

The month with the highest number of snowfall days is December (1.2 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Swansea, CA

Average daylight / Average sunshine - Swansea, CA

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.7h).

The month with the most sunshine is June (Average sunshine: 12.2h).
Months with the least sunshine are January, February and December (Average sunshine: 7.3).

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Average sunshine days
Swansea, CA

Average sunshine days - Swansea, CA

The month with the most sunshine days is October (27.7 days).
The month with the least sunshine days is July (20 days).

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Average visibility
Swansea, CA

Average visibility - Swansea, 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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