Monthly weather forecast and climate
Fountain Valley, CA

Weather in January

January, like December, in Fountain Valley, California, is another comfortable winter month, with average temperature ranging between min 52.9°F (11.6°C) and max 64.6°F (18.1°C). In Fountain Valley, the average high-temperature is relatively the same as in December - a still enjoyable 64.6°F (18.1°C). Weather in January »

Weather in February

The last month of the winter, February, is another comfortable month in Fountain Valley, California, with temperature in the range of an average high of 63.9°F (17.7°C) and an average low of 51.8°F (11°C). In February, the average high-temperature is almost the same as in January - a still enjoyable 63.9°F (17.7°C). Weather in February »

Weather in March

The first month of the spring, March, is also an enjoyable month in Fountain Valley, California, with temperature in the range of an average low of 53.2°F (11.8°C) and an average high of 65.3°F (18.5°C). In March, the average high-temperature is essentially the same as in February - a still enjoyable 65.3°F (18.5°C). Weather in March »

Weather in April

April, like March, in Fountain Valley, California, is another comfortable spring month, with average temperature fluctuating between 67.5°F (19.7°C) and 54.3°F (12.4°C). In Fountain Valley, California, the average high-temperature is practically the same as in March - a still comfortable 67.5°F (19.7°C). Weather in April »

Weather in May

May, the last month of the spring, in Fountain Valley, is an agreeable month, with temperature in the range of an average low of 56.8°F (13.8°C) and an average high of 68.7°F (20.4°C). In May, the average high-temperature is almost the same as in April - an agreeable 68.7°F (20.4°C). Weather in May »

Weather in June

The first month of the summer, June, is also an agreeable month in Fountain Valley, California, with average temperature fluctuating between 72.1°F (22.3°C) and 59°F (15°C). In Fountain Valley, the average high-temperature is almost the same as in May - a still agreeable 72.1°F (22.3°C). Weather in June »

Weather in July

July in Fountain Valley, California, is a warm summer month, with average temperature varying between 63.1°F (17.3°C) and 76.6°F (24.8°C). In July, the average high-temperature is almost the same as in June - a warm 76.6°F (24.8°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Fountain Valley, California, with temperature in the range of an average high of 78.1°F (25.6°C) and an average low of 65.1°F (18.4°C). August is the warmest month, with an average high-temperature of 78.1°F (25.6°C) and an average low-temperature of 65.1°F (18.4°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Fountain Valley, California, with temperature in the range of an average low of 64.8°F (18.2°C) and an average high of 77.5°F (25.3°C). In September, the average high-temperature is essentially the same as in August - a still warm 77.5°F (25.3°C). Weather in September »

Weather in October

October, the same as September, is another warm autumn month in Fountain Valley, California, with average temperature varying between 74.3°F (23.5°C) and 62.1°F (16.7°C). In Fountain Valley, the average high-temperature is relatively the same as in September - a still warm 74.3°F (23.5°C). Weather in October »

Weather in November

November, the last month of the autumn, in Fountain Valley, is also an agreeable month, with temperature in the range of an average high of 69.3°F (20.7°C) and an average low of 57.7°F (14.3°C). In November, the average high-temperature is essentially the same as in October - a pleasant 69.3°F (20.7°C). Weather in November »

Weather in December

December, the first month of the winter, in Fountain Valley, is also an enjoyable month, with average temperature varying between 62.6°F (17°C) and 52.7°F (11.5°C). With an average high-temperature of 62.6°F (17°C) and an average low-temperature of 52.7°F (11.5°C), December is the coldest month. Weather in December »
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FAQ

How much does it rain in Fountain Valley?

Throughout the year, in Fountain Valley, California, there are 59.1 rainfall days, and 8.86" (225mm) of precipitation is accumulated.

What is the month with the lowest UV index in Fountain Valley?

Months with the lowest UV index are January through March, November and December, with an average maximum UV index of 4.

What is the most humid month in Fountain Valley?

June is the most humid month, with an average relative humidity of 72%.

What is the driest month in Fountain Valley?

The month with the least rainfall in Fountain Valley is June when the rain falls for 2.3 days and typically collects 0.04" (1mm) of precipitation.

When are the longest days in Fountain Valley?

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

What is the month with the most sunshine in Fountain Valley?

Months with the most sunshine are July and August, with an average of 12h of sunshine.

What is the month with the highest UV index in Fountain Valley?

Months with the highest UV index in Fountain Valley are July through September, with an average maximum UV index of 6.

What is the warmest month in Fountain Valley?

With an average high-temperature of 78.1°F (25.6°C) and an average low-temperature of 65.1°F (18.4°C), August is the warmest month.

What is the least humid month in Fountain Valley?

November is the least humid month in Fountain Valley, California, with an average relative humidity of 56%.

What is the coldest month in Fountain Valley?

December is the coldest month in Fountain Valley, California, with an average high-temperature of 62.6°F (17°C) and an average low-temperature of 52.7°F (11.5°C).

What is the rainiest month in Fountain Valley?

The month with the most rainfall in Fountain Valley is December when the rain falls for 7.1 days and typically aggregates up to 1.81" (46mm) of precipitation.

What is the month with the shortest days in Fountain Valley?

With an average of 9.9h of daylight, December has the shortest days of the year in Fountain Valley, California.

What is the month with the least sunshine in Fountain Valley?

The month with the least sunshine in Fountain Valley is December, with an average of 6.6h of sunshine.

Average temperature
Fountain Valley, CA

Average temperature - Fountain Valley, CA

The warmest month (with the highest average high temperature) is August (78.1°F).
The month with the lowest average high temperature is December (62.6°F).

The month with the highest average low temperature is August (65.1°F).
The coldest month (with the lowest average low temperature) is February (51.8°F).

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Average pressure
Fountain Valley, CA

Average pressure - Fountain Valley, CA

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

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Average wind speed
Fountain Valley, CA

Average wind speed - Fountain Valley, CA

The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest months (with the lowest average wind speed) are September and October (5.2mph).

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Average humidity
Fountain Valley, CA

Average humidity - Fountain Valley, CA

The month with the highest relative humidity is June (72%).
The month with the lowest relative humidity is November (56%).

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Average rainfall
Fountain Valley, CA

Average rainfall - Fountain Valley, CA

The wettest month (with the highest rainfall) is December (1.81").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days
Fountain Valley, CA

Average rainfall days - Fountain Valley, CA

The month with the highest number of rainy days is March (7.9 days).
The month with the least rainy days is August (2.1 days).

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Average daylight / Average sunshine
Fountain Valley, CA

Average daylight / Average sunshine - Fountain Valley, 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: 12h).
The month with the least sunshine is December (Average sunshine: 6.6h).

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Average sunshine days
Fountain Valley, CA

Average sunshine days - Fountain Valley, CA

The month with the most sunshine days is August (26.8 days).
The month with the least sunshine days is February (20 days).

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Average UV index
Fountain Valley, CA

Average UV index - Fountain Valley, CA

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

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Average visibility
Fountain Valley, CA

Average visibility - Fountain Valley, 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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