May weather forecast
Fairfax, CA

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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).

Temperature

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. May witnesses an average nighttime temperature of 50.7°F (10.4°C).

Humidity

In May, the average relative humidity is 76%.

Rainfall

In May, the rain falls for 5.7 days. Throughout May, 0.71" (18mm) of precipitation is accumulated. In Fairfax, during the entire year, the rain falls for 80.3 days and collects up to 15.98" (406mm) of precipitation.

Snowfall

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

Daylight

In Fairfax, the average length of the day in May is 14h and 14min.
On the first day of the month, sunrise is at 6:13 am and sunset at 8:01 pm. On the last day of May, sunrise is at 5:49 am and sunset at 8:26 pm PDT.

Sunshine

In Fairfax, the average sunshine in May is 10h.

UV index

The average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.
Note: The daily high UV index of 4 during May translates into the following recommendations:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. To guard against the harmful effects of the Sun, minimize exposure during midday. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Updated: Jul 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in May?

May temperatures vary between a high-temperature of 63.3°F (17.4°C) and a low-temperature of 50.7°F (10.4°C).

What is the average humidity in May?

In Fairfax, the average relative humidity in May is 76%.

How much does it rain in May?

In Fairfax, in May, during 5.7 rainfall days, 0.71" (18mm) of precipitation is typically accumulated.

When it does not snow?

January through November are months without snowfall.

How many hours of daylight does Fairfax have in May?

In Fairfax, the average day length in May is 14h and 14min.

When are sunrise and sunset in May?

On the first day of May, sunrise is at 6:13 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 8:26 pm PDT.

How many hours of sunshine does Fairfax have in May?

In May, the average sunshine duration is 10h.

How high is the UV index in May?

In May, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Fairfax, CA

Average temperature in May - Fairfax, CA
  • Average high temperature in May: 63.3°F

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).

  • Average low temperature in May: 50.7°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 in May
Fairfax, CA

Average pressure in May - Fairfax, CA
  • Average pressure in May: 29.98"Hg

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 in May
Fairfax, CA

Average wind speed in May - Fairfax, CA
  • Average wind speed in May: 8.3mph

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 in May
Fairfax, CA

Average humidity in May - Fairfax, CA
  • Average humidity in May: 76%

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

Average rainfall in May
Fairfax, CA

Average rainfall in May - Fairfax, CA
  • Average rainfall in May: 0.71"

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 in May
Fairfax, CA

Average rainfall days in May - Fairfax, CA
  • Average rainfall days in May: 5.7 days

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 in May
Fairfax, CA

Average snowfall days in May - Fairfax, CA
  • Average snowfall days in May: 0 days

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 in May /
Average sunshine in May
Fairfax, CA

Average daylight in May / Average sunshine in May - Fairfax, CA
  • Average daylight in May: 14h and 1min

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).

  • Average sunshine in May: 10h and 0min

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 in May
Fairfax, CA

Average sunshine days in May - Fairfax, CA
  • Average sunshine days in May: 22.8 days

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 in May
Fairfax, CA

Average UV index in May - Fairfax, CA
  • Average UV index in May: 4

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 cloud cover in May
Fairfax, CA

Average cloud cover in May - Fairfax, CA
  • Average cloud cover in May: 31

The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is September (Cloud cover 19).

Average visibility in May
Fairfax, CA

Average visibility in May - Fairfax, CA
  • Average visibility in May: 6mi

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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