Monthly weather forecast and climate
Napa Junction, CA

Weather in January

January in Napa Junction, California, is a mild winter month, with temperature in the range of an average high of 56.3°F (13.5°C) and an average low of 42.3°F (5.7°C). In January, the average high-temperature is practically the same as in December - a mild 56.3°F (13.5°C). Weather in January »

Weather in February

February, the last month of the winter, in Napa Junction, is another mild month, with average temperature varying between 42.8°F (6°C) and 59.4°F (15.2°C). In February, the average high-temperature is almost the same as in January - a still moderate 59.4°F (15.2°C). Weather in February »

Weather in March

March, the first month of the spring, in Napa Junction, is an enjoyable month, with average temperature ranging between min 44.1°F (6.7°C) and max 61.3°F (16.3°C). In March, the average high-temperature is almost the same as in February - an enjoyable 61.3°F (16.3°C). Weather in March »

Weather in April

April, the same as March, is another enjoyable spring month in Napa Junction, California, with average temperature fluctuating between 46°F (7.8°C) and 67.1°F (19.5°C). In Napa Junction, the average high-temperature marginally rises, from an enjoyable 61.3°F (16.3°C) in March, to a still comfortable 67.1°F (19.5°C). Weather in April »

Weather in May

May, the last month of the spring, in Napa Junction, is a pleasant month, with average temperature varying between 72°F (22.2°C) and 49.6°F (9.8°C). In Napa Junction, the average high-temperature is essentially the same as in April - an agreeable 72°F (22.2°C). Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in Napa Junction, California, with average temperature fluctuating between 54.3°F (12.4°C) and 79.7°F (26.5°C). In Napa Junction, California, the average high-temperature in June slightly increases, from a pleasant 72°F (22.2°C) in May, to a warm 79.7°F (26.5°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Napa Junction, California, with average temperature fluctuating between 55.8°F (13.2°C) and 82.6°F (28.1°C). With an average high-temperature of 82.6°F (28.1°C) and an average low-temperature of 55.8°F (13.2°C), July is the warmest month. The average heat index is calculated to 85.5°F (29.7°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Napa Junction, California, with average temperature ranging between max 82°F (27.8°C) and min 56.5°F (13.6°C). In Napa Junction, California, the average high-temperature is almost the same as in July - a still warm 82°F (27.8°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Napa Junction, California, with average temperature ranging between min 56.3°F (13.5°C) and max 81.7°F (27.6°C). In September, the average high-temperature is essentially the same as in August - a still warm 81.7°F (27.6°C). Weather in September »

Weather in October

October, the same as September, is a moderately hot autumn month in Napa Junction, California, with temperature in the range of an average high of 73.6°F (23.1°C) and an average low of 53.2°F (11.8°C). In October, the average high-temperature marginally drops, from 81.7°F (27.6°C) in September, to a still moderately hot 73.6°F (23.1°C). Weather in October »

Weather in November

November, the last month of the autumn, in Napa Junction, is another comfortable month, with average temperature varying between 63.1°F (17.3°C) and 46.8°F (8.2°C). In November, the average high-temperature decreases, from a warm 73.6°F (23.1°C) in October, to an enjoyable 63.1°F (17.3°C). Weather in November »

Weather in December

The first month of the winter, December, is also a fresh month in Napa Junction, California, with average temperature fluctuating between 54.9°F (12.7°C) and 42.3°F (5.7°C). With an average high-temperature of 54.9°F (12.7°C) and an average low-temperature of 42.3°F (5.7°C), December is the coldest month. Weather in December »
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FAQ

How much does it rain in Napa Junction?

In Napa Junction, during the entire year, the rain falls for 68.2 days and collects up to 11.93" (303mm) of precipitation.

What is the month with the lowest UV index in Napa Junction?

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Napa Junction, California.

What is the wettest month in Napa Junction?

The month with the most rainfall in Napa Junction is February when the rain falls for 7.3 days and typically aggregates up to 2.32" (59mm) of precipitation.

What is the most humid month in Napa Junction?

The most humid month in Napa Junction, California, is March, with an average relative humidity of 75%.

When are the longest days in Napa Junction?

The month with the longest days in Napa Junction is June, with an average of 14.8h of daylight.

What is the month with the highest UV index in Napa Junction?

Months with the highest UV index in Napa Junction, California, are June through August, with an average maximum UV index of 6.

What is the warmest month in Napa Junction?

The warmest month in Napa Junction, California, is July, with an average high-temperature of 82.6°F (28.1°C) and an average low-temperature of 55.8°F (13.2°C).

What is the driest month in Napa Junction?

Months with the least rainfall are July and August Rain falls for 1.3 days and accumulates 0.04" (1mm) of rain.

What is the month with the most sunshine in Napa Junction?

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

What is the least humid month in Napa Junction?

With an average relative humidity of 58%, September is the least humid month.

What is the coldest month in Napa Junction?

December is the coldest month in Napa Junction, California, with an average high-temperature of 54.9°F (12.7°C) and an average low-temperature of 42.3°F (5.7°C).

What is the month with the shortest days in Napa Junction?

December has the shortest days of the year in Napa Junction, California, with an average of 9.6h of daylight.

What is the month with the least sunshine in Napa Junction?

December has the least sunshine of the year in Napa Junction, with an average of 5.7h of sunshine.

Average temperature
Napa Junction, CA

Average temperature - Napa Junction, CA

The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is December (54.9°F).

The month with the highest average low temperature is August (56.5°F).
The coldest months (with the lowest average low temperature) are January and December (42.3°F).

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Average pressure
Napa Junction, CA

Average pressure - Napa Junction, CA

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed
Napa Junction, CA

Average wind speed - Napa Junction, CA

The windiest month (with the highest average wind speed) is May (6.6mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).

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Average humidity
Napa Junction, CA

Average humidity - Napa Junction, CA

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is September (58%).

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Average rainfall
Napa Junction, CA

Average rainfall - Napa Junction, CA

The wettest month (with the highest rainfall) is February (2.32").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days
Napa Junction, CA

Average rainfall days - Napa Junction, CA

The month with the highest number of rainy days is March (11.9 days).
The month with the least rainy days is August (0.9 days).

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Average daylight / Average sunshine
Napa Junction, CA

Average daylight / Average sunshine - Napa Junction, 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).

Months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days
Napa Junction, CA

Average sunshine days - Napa Junction, CA

Months with the most sunshine days are July and August (29.1 days).
The month with the least sunshine days is March (18.3 days).

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Average UV index
Napa Junction, CA

Average UV index - Napa Junction, CA

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

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Average visibility
Napa Junction, CA

Average visibility - Napa Junction, 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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