May weather forecastHalf Moon Bay, CA
May
Weather in May
May, the last month of the spring in Half Moon Bay, is also a moderate month, with an average temperature ranging between max 60.4°F (15.8°C) and min 51.4°F (10.8°C).Temperature
The ushering in of May brings an average high-temperature of a still refreshing 60.4°F (15.8°C), closely mirroring the 58.6°F (14.8°C) of April. May nights reflect a consistent temperature dip to a fresh 51.4°F (10.8°C), a slight descent from daytime peaks.Humidity
In May, the average relative humidity is 79%.Rainfall
In Half Moon Bay, in May, it is raining for 6.8 days, with typically 0.43" (11mm) of accumulated precipitation. Throughout the year, there are 76.8 rainfall days, and 8.54" (217mm) of precipitation is accumulated.Daylight
In Half Moon Bay, the average length of the day in May is 14h and 12min.On the first day of the month, sunrise is at 6:13 am and sunset at 8:00 pm. On the last day of May, sunrise is at 5:50 am and sunset at 8:24 pm PDT.
Sunshine
The average sunshine in May in Half Moon Bay is 10.1h.UV index
January through May, July, October through December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The daily high UV index of 4 in May translates into this advice:
Exercise prevention - Warding off sunburn is urged. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Half Moon Bay, CA
- Average high temperature in May: 60.4°F
The warmest month (with the highest average high temperature) is September (66.9°F).
The month with the lowest average high temperature is December (55.6°F).
- Average low temperature in May: 51.4°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 (48.7°F).
Average pressure in May
Half Moon Bay, CA
- Average pressure in May: 29.99"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
Half Moon Bay, CA
- Average wind speed in May: 9.3mph
The windiest month (with the highest average wind speed) is April (9.6mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in May
Half Moon Bay, CA
- Average humidity in May: 79%
The month with the highest relative humidity is August (82%).
The months with the lowest relative humidity are November and December (72%).
Average rainfall in May
Half Moon Bay, CA
- Average rainfall in May: 0.43"
The wettest month (with the highest rainfall) is February (1.61").
The driest months (with the least rainfall) are June and July (0.12").
Average rainfall days in May
Half Moon Bay, CA
- Average rainfall days in May: 6.8 days
The month with the highest number of rainy days is March (10.8 days).
The month with the least rainy days is June (3 days).
Average daylight in May /
Average sunshine in May
Half Moon Bay, 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 6min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in May
Half Moon Bay, CA
- Average sunshine days in May: 20.9 days
The month with the most sunshine days is October (24.6 days).
The months with the least sunshine days are March and August (18.8 days).
Average UV index in May
Half Moon Bay, CA
- Average UV index in May: 4
The months with the highest UV index are June, August and September (UV index 5).
The months with the lowest UV index are January, February, March, April, May, July, October, November and December (UV index 4).
Average cloud cover in May
Half Moon Bay, CA
- Average cloud cover in May: 31
The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is September (Cloud cover 18).
Average visibility in May
Half Moon Bay, 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).
