Climate and monthly weather forecast
Fairfax, CA

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Weather in January

January is a moderate winter month in Fairfax, California, with an average temperature varying between 46.6°F (8.1°C) and 55.9°F (13.3°C). In January, Fairfax experiences a minor shift in meteorological conditions with average high-temperatures marked at a refreshing 55.9°F (13.3°C), closely mirroring the climate in December. Weather in January »

Weather in February

February, the last month of the winter in Fairfax, is another refreshing month, with an average temperature ranging between min 46.8°F (8.2°C) and max 57.4°F (14.1°C). The arrival of February sees an average high-temperature of a still refreshing 57.4°F (14.1°C), hardly diverging from January's 55.9°F (13.3°C). Weather in February »

Weather in March

March, the first month of the spring in Fairfax, is still a mild month, with an average temperature ranging between max 59.2°F (15.1°C) and min 47.8°F (8.8°C). Fairfax experiences a recorded average high-temperature of a still moderate 59.2°F (15.1°C) in March, closely aligned with February's 57.4°F (14.1°C). Weather in March »

Weather in April

April is a comfortable spring month in Fairfax, California, with an average temperature fluctuating between 48.7°F (9.3°C) and 61.7°F (16.5°C). The commencement of April notes an average high-temperature of an enjoyable 61.7°F (16.5°C), exhibiting little difference from the previous month. Weather in April »

Weather in May

The last month of the spring, May, is another comfortable month in Fairfax, California, with an average temperature fluctuating between 50.7°F (10.4°C) and 63.3°F (17.4°C). Fairfax registers an average high-temperature of a still refreshing 63.3°F (17.4°C) at the commencement of May, closely related to the preceding month. Weather in May »

Weather in June

June, the first month of the summer in Fairfax, is also an enjoyable month, with an average temperature ranging between min 53.8°F (12.1°C) and max 67.8°F (19.9°C). June's arrival brings an average high-temperature of a still refreshing 67.8°F (19.9°C), demonstrating subtle variation from the preceding month. Weather in June »

Weather in July

July is an agreeable summer month in Fairfax, California, with an average temperature ranging between max 68.5°F (20.3°C) and min 54.9°F (12.7°C). The unfolding of July shows an average high-temperature of a pleasant 68.5°F (20.3°C), indicating a slight variance from June's 67.8°F (19.9°C). Weather in July »

Weather in August

The last month of the summer, August, is also an agreeable month in Fairfax, California, with an average temperature ranging between max 69.4°F (20.8°C) and min 56.1°F (13.4°C). Fairfax's weather in August indicates an average high-temperature of a still agreeable 69.4°F (20.8°C), nearly consistent with the 68.5°F (20.3°C) of July. Weather in August »

Weather in September

September, the first month of the autumn in Fairfax, is also an agreeable month, with an average temperature ranging between max 70.9°F (21.6°C) and min 56.3°F (13.5°C). September temperatures tend to peak at an average high of 70.9°F (21.6°C) and dip to a low of 56.3°F (13.5°C). Weather in September »

Weather in October

October, like September, in Fairfax, California, is another comfortable autumn month, with an average temperature ranging between min 54.7°F (12.6°C) and max 67.5°F (19.7°C). With the transition into October, Fairfax notes an average high-temperature of an enjoyable 67.5°F (19.7°C), closely resembling September. Weather in October »

Weather in November

The last month of the autumn, November, is another refreshing month in Fairfax, California, with temperature in the range of an average high of 61.2°F (16.2°C) and an average low of 50.2°F (10.1°C). November implies a soft temperature shift, with average high-temperatures reducing from October's 67.5°F (19.7°C) to a still refreshing 61.2°F (16.2°C). Weather in November »

Weather in December

The first month of the winter, December, is also a fresh month in Fairfax, California, with an average temperature fluctuating between 46°F (7.8°C) and 55.2°F (12.9°C). Fairfax experiences its lowest temperatures in December, with an average peak of 55.2°F (12.9°C) and a low of 46°F (7.8°C). Weather in December »
Updated: Jul 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How much does it rain?

Throughout the year, there are 80.3 rainfall days, and 15.98" (406mm) of precipitation is accumulated.

When it does not snow?

In Fairfax, snow does not fall in January through November.

How many days does it snow?

Throughout the year, there are 0.1 snowfall days.

What is the wettest month?

The month with the most rainfall in Fairfax 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?

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

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.

When are the longest days?

The month with the longest days is June, with an average of 14h and 48min of daylight.

What are the months with the highest UV index?

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

What is the driest month?

The months with the least rainfall are July and August Rain falls for 2.3 days and accumulates 0.08" (2mm) of rain.

What month has the most sunshine?

The month with the most sunshine is July, with an average of 11.2h of sunshine.

What is the most humid month?

The most humid month is August, with an average relative humidity of 78%.

What are the warmest months?

The highest temperatures are recorded in September, with averages reaching a high of 70.9°F (21.6°C) and a low of 56.3°F (13.5°C).

What is the least humid month?

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

What part of the year is the coldest?

Temperature readings reach their annual highs in December, averaging 55.2°F (12.9°C) and a minimum average of 46°F (7.8°C).

When does it snow?

December is the only month when snow falls.

What is the snowiest month?

December has the most snowfall days of the year. Snow falls for 0.1 days.

What is the month with the shortest days?

With an average of 9h and 36min of daylight, December has the shortest days of the year.

What is the month with the least sunshine?

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

Average temperature
Fairfax, CA

Average temperature - Fairfax, 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).

Average pressure
Fairfax, CA

Average pressure - Fairfax, CA

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

Average wind speed
Fairfax, CA

Average wind speed - Fairfax, 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).

Average humidity
Fairfax, CA

Average humidity - Fairfax, CA

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

Average rainfall
Fairfax, CA

Average rainfall - Fairfax, 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").

Average rainfall days
Fairfax, CA

Average rainfall days - Fairfax, 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).

Average snowfall days
Fairfax, CA

Average snowfall days - Fairfax, CA

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

Average daylight / Average sunshine
Fairfax, CA

Average daylight / Average sunshine - Fairfax, CA

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).

Average sunshine days
Fairfax, CA

Average sunshine days - Fairfax, CA

The 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).

Average UV index
Fairfax, CA

Average UV index - Fairfax, CA

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

Average visibility
Fairfax, CA

Average visibility - Fairfax, CA

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Fairfax, California, USA

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