May weather forecastFullerton, CA
May
Weather in May
May continues the trend of rising temperatures with high averages reaching 72.3°F (22.4°C) and lower temperatures at 56.1°F (13.4°C). The rainfall dips even further to just 0.2" (5mm), making May the month with low rainfall in the first half of the year. Being midway into spring, Fullerton experiences a rise in both temperature and daylight hours. Enjoy early summer weather as the month progresses, marked by longer sunshine hours and reduced rainfall days. With the increasing warmth, the city gradually prepares to welcome summer.Temperature
A minimal variation is noted in Fullerton's average high-temperature at the onset of May, reaching a still agreeable 72.3°F (22.4°C) from April's 70.5°F (21.4°C). In May, Fullerton experiences an average nighttime temperature of 56.1°F (13.4°C).Humidity
The average relative humidity in May is 64%.Rainfall
In Fullerton, in May, during 4 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. Throughout the year, there are 52.5 rainfall days, and 7.09" (180mm) of precipitation is accumulated.Daylight
In Fullerton, the average length of the day in May is 13h and 56min.On the first day of the month, sunrise is at 6:01 am and sunset at 7:35 pm. On the last day of May, sunrise is at 5:41 am and sunset at 7:57 pm PDT.
Sunshine
In May, the average sunshine is 11.3h.UV index
The average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 5 in May converts into the following recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Direct Sun exposure should be minimized especially during midday when radiation is most intense. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Fullerton, CA
- Average high temperature in May: 72.3°F
The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (64°F).
- Average low temperature in May: 56.1°F
The month with the highest average low temperature is August (65.5°F).
The coldest month (with the lowest average low temperature) is February (50.2°F).
Average pressure in May
Fullerton, CA
- Average pressure in May: 29.92"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in May
Fullerton, CA
- Average wind speed in May: 5.8mph
The windiest month (with the highest average wind speed) is April (6mph).
The calmest months (with the lowest average wind speed) are September and October (4.7mph).
Average humidity in May
Fullerton, CA
- Average humidity in May: 64%
The month with the highest relative humidity is June (65%).
The month with the lowest relative humidity is November (51%).
Average rainfall in May
Fullerton, CA
- Average rainfall in May: 0.2"
The wettest month (with the highest rainfall) is December (1.54").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in May
Fullerton, CA
- Average rainfall days in May: 4 days
The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is June (1.5 days).
Average daylight in May /
Average sunshine in May
Fullerton, CA
- Average daylight in May: 13h and 54min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in May: 11h and 18min
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 42min).
Average sunshine days in May
Fullerton, CA
- Average sunshine days in May: 23.6 days
The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is February (20.6 days).
Average UV index in May
Fullerton, 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, November and December (UV index 4).
Average cloud cover in May
Fullerton, CA
- Average cloud cover in May: 17
The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in May
Fullerton, 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).
