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
The transition into May notes an average high-temperature of a still pleasant 70.9°F (21.6°C), revealing a mild distinction from the 69.3°F (20.7°C) in April. In the month of May, Portola Hills witnesses a consistent average low-temperature of 55.2°F (12.9°C).Humidity
May and June, with an average relative humidity of 69%, are the most humid months.Rainfall
In May, in Portola Hills, the rain falls for 6.2 days. Throughout May, 0.39" (10mm) of precipitation is accumulated. Throughout the year, there are 65.4 rainfall days, and 9.17" (233mm) of precipitation is accumulated.Daylight
The average length of the day in May is 13h and 55min.On the first day of the month, sunrise is at 6:00 am and sunset at 7:34 pm. On the last day of May, sunrise is at 5:41 am and sunset at 7:55 pm PDT.
Sunshine
In Portola Hills, the average sunshine in May is 11.1h.UV index
In May, the average daily maximum UV index in Portola Hills is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index of 5 during May leads to these instructions:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Portola Hills in May?
What is the most humid month?
What is the average humidity in May?
How many days does it rain in May?
How many hours of daylight does Portola Hills have in May?
When is the sunrise / sunset in May?
How many hours of sunshine does Portola Hills have in May?
How high is the UV index in May?
Average temperature in May
Portola Hills, CA
- Average high temperature in May: 70.9°F
The warmest month (with the highest average high temperature) is August (82°F).
The month with the lowest average high temperature is December (63.1°F).
- Average low temperature in May: 55.2°F
The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is February (48.7°F).
Average pressure in May
Portola Hills, CA
- Average pressure in May: 29.92"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.88"Hg).
Average wind speed in May
Portola Hills, CA
- Average wind speed in May: 5.7mph
The windiest months (with the highest average wind speed) are April and May (5.7mph).
The calmest months (with the lowest average wind speed) are August and September (4.5mph).
Average humidity in May
Portola Hills, CA
- Average humidity in May: 69%
The months with the highest relative humidity are May and June (69%).
The month with the lowest relative humidity is November (55%).
Average rainfall in May
Portola Hills, CA
- Average rainfall in May: 0.39"
The wettest month (with the highest rainfall) is December (1.85").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in May
Portola Hills, CA
- Average rainfall days in May: 6.2 days
The month with the highest number of rainy days is March (8.1 days).
The month with the least rainy days is June (2 days).
Average daylight in May /
Average sunshine in May
Portola Hills, CA
- Average daylight in May: 13h and 5min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in May: 11h and 1min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in May
Portola Hills, CA
- Average sunshine days in May: 19.3 days
The months with the most sunshine days are January and October (24.2 days).
The month with the least sunshine days is May (19.3 days).
Average UV index in May
Portola Hills, CA
- Average UV index in May: 5
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in May
Portola Hills, CA
- Average cloud cover in May: 20
The months with the most cloud cover are March and December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in May
Portola Hills, 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).
Portola Hills, California, USA
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