May weather forecastFairfax, CA
May
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 14h and 12min
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: 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: 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: 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: 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).
