Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
May's onset brings an average high-temperature of a still enjoyable 65.3°F (18.5°C), showing a minute difference from April's 62.8°F (17.1°C). The average low-temperature, in May, is a cool 50.2°F (10.1°C).Humidity
In Atherton, the average relative humidity in May is 73%.Rainfall
In Atherton, in May, during 5.3 rainfall days, 0.59" (15mm) of precipitation is typically accumulated. In Atherton, California, during the entire year, the rain falls for 73.4 days and collects up to 11.89" (302mm) of precipitation.Daylight
In May, the average length of the day 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, in Atherton, California, sunrise is at 5:49 am and sunset at 8:23 pm PDT.
Sunshine
In May, the average sunshine is 10.7h.UV index
In Atherton, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents 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:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Stay sun-safe with clothing that is both closely woven and worn loosely.
Frequently asked questions
What is the average May temperature in Atherton?
What is the average humidity in May in Atherton?
How much does it rain in Atherton in May?
What is the average length of the day in May in Atherton?
What time are sunrise and sunset in May in Atherton?
How many hours of sunshine does Atherton have in May?
What is the UV index reading in May in Atherton?
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 1min
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 4min
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).
Atherton, California, USA
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