May weather forecastPomona, CA
May
Weather in May
As the seasons turn, May brings a marked increase in Pomona's temperatures creating a transition from spring to anticipated summer. More daylight hours ensure a bright, sunlit city that welcomes outdoor enthusiasts. The warmer temperatures prompt many to take refuge in the coolness of Pomona's gardens and parks. Rainfall becomes a scarce occurrence making May a relatively dry month. The warmth and sunshine paired with decreased rainfall characterize May as a herald of the coming summer in Pomona.Temperature
The onset of May brings with it an average high-temperature of a moderately hot 76.3°F (24.6°C), showing a negligible variation from the month before. The nighttime temperature during May displays a significant divergence from daily peaks, averaging at a cool 54°F (12.2°C).Humidity
With an average relative humidity of 56%, May is the most humid month in Pomona.Rainfall
In Pomona, in May, during 3.6 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. Throughout the year, there are 48 rainfall days, and 7.52" (191mm) of precipitation is accumulated.Snowfall
In Pomona, snow does not fall in January, March through December.Daylight
In Pomona, the average length of the day in May is 13h and 57min.On the first day of May, sunrise is at 6:00 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 5:40 am and sunset at 7:57 pm PDT.
Sunshine
The average sunshine in May is 11.6h.UV index
In May, the average daily maximum UV index in Pomona, California, is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In May, an average UV index of 5 transforms into the following instructions:
Ensure safety - Imperative it is to shield skin and eyes from damage. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Pomona, CA
- Average high temperature in May: 76.3°F
The warmest month (with the highest average high temperature) is August (90.1°F).
The month with the lowest average high temperature is December (63.1°F).
- Average low temperature in May: 54°F
The month with the highest average low temperature is August (65.7°F).
The coldest months (with the lowest average low temperature) are February and December (46.8°F).
Average pressure in May
Pomona, CA
- Average pressure in May: 29.91"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in May
Pomona, 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 month (with the lowest average wind speed) is September (4.4mph).
Average humidity in May
Pomona, CA
- Average humidity in May: 56%
The month with the highest relative humidity is May (56%).
The months with the lowest relative humidity are August and November (45%).
Average rainfall in May
Pomona, CA
- Average rainfall in May: 0.24"
The wettest months (with the highest rainfall) are February and December (1.65").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days in May
Pomona, CA
- Average rainfall days in May: 3.6 days
The month with the highest number of rainy days is March (7.6 days).
The month with the least rainy days is June (0.8 days).
Average snowfall days in May
Pomona, CA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in May /
Average sunshine in May
Pomona, 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 36min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).
Average sunshine days in May
Pomona, CA
- Average sunshine days in May: 26 days
The month with the most sunshine days is June (28.7 days).
The month with the least sunshine days is February (21.1 days).
Average UV index in May
Pomona, CA
- Average UV index in May: 5
The month with the highest UV index is August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in May
Pomona, CA
- Average cloud cover in May: 14
The months with the most cloud cover are February, March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility in May
Pomona, 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).
