May weather forecastAtherton, CA
May
Weather in May
May, the last month of the spring in Atherton, is also an enjoyable month, with an average temperature varying between 65.3°F (18.5°C) and 50.2°F (10.1°C).Temperature
With May's advent, Atherton sees an average high-temperature of a still comfortable 65.3°F (18.5°C), subtly shifted from April's 62.8°F (17.1°C). Atherton's average low-temperature for the month of May records at a cool 50.2°F (10.1°C).Humidity
The average relative humidity in May is 73%.Rainfall
In Atherton, in May, it is raining for 5.3 days, with typically 0.59" (15mm) of accumulated precipitation. In Atherton, during the entire year, the rain falls for 73.4 days and collects up to 11.89" (302mm) of precipitation.Daylight
The average length of the day in May is 14h and 12min.On the first day of the month, sunrise is at 6:12 am and sunset at 7:59 pm. On the last day of May, sunrise is at 5:49 am and sunset at 8:23 pm PDT.
Sunshine
In Atherton, the average sunshine in May is 10.7h.UV index
In Atherton, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: The UV index of 4 during May leads to these advisories:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Atherton, CA
- Average high temperature in May: 65.3°F
The warmest months (with the highest average high temperature) are July and August (73°F).
The month with the lowest average high temperature is December (55.9°F).
- Average low temperature in May: 50.2°F
The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is February (46°F).
Average pressure in May
Atherton, CA
- Average pressure in May: 29.98"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).
Average wind speed in May
Atherton, CA
- Average wind speed in May: 7.3mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.5mph).
Average humidity in May
Atherton, CA
- Average humidity in May: 73%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (68%).
Average rainfall in May
Atherton, CA
- Average rainfall in May: 0.59"
The wettest month (with the highest rainfall) is February (2.36").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in May
Atherton, CA
- Average rainfall days in May: 5.3 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (0.8 days).
Average daylight in May /
Average sunshine in May
Atherton, CA
- Average daylight in May: 14h and 12min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in May: 10h and 42min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in May
Atherton, CA
- Average sunshine days in May: 23.2 days
The month with the most sunshine days is August (27.6 days).
The month with the least sunshine days is March (17.5 days).
Average UV index in May
Atherton, 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 November and December (UV index 3).
Average cloud cover in May
Atherton, CA
- Average cloud cover in May: 25
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in May
Atherton, 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).
