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 weather during May records an average high-temperature of a moderately hot 75.7°F (24.3°C), closely mirroring the preceding month. San Dimas registers a prominent dip from daytime highs, with an average of 54°F (12.2°C) during the nights of May.Humidity
March and May, with an average relative humidity of 55%, are the most humid months.Rainfall
In May, the rain falls for 3.4 days. Throughout May, 0.24" (6mm) of precipitation is accumulated. In San Dimas, during the entire year, the rain falls for 45.2 days and collects up to 6.5" (165mm) of precipitation.Daylight
In May, the average length of the day is 13h and 57min.On the first day of the month, sunrise is at 6:00 am and sunset at 7:35 pm. On the last day of May, sunrise is at 5:40 am and sunset at 7:57 pm PDT.
Sunshine
In May, the average sunshine is 11.8h.UV index
In May, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 5 during May leads to these instructions:
Put precautions into practice - Ensuring skin and eye safety is a necessity. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are May temperatures?
What are the most humid months?
What is the average humidity in May?
How many days does it rain in May?
What is the average length of the day in May?
What time are sunrise and sunset in May?
How long on average sun shines in May in San Dimas?
What is the UV index intensity in May?
Average temperature in May
San Dimas, CA
- Average high temperature in May: 75.7°F
The warmest month (with the highest average high temperature) is August (89.4°F).
The month with the lowest average high temperature is December (62.4°F).
- Average low temperature in May: 54°F
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).
Average pressure in May
San Dimas, 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
San Dimas, 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 (4.3mph).
Average humidity in May
San Dimas, CA
- Average humidity in May: 55%
The months with the highest relative humidity are March and May (55%).
The months with the lowest relative humidity are August and November (45%).
Average rainfall in May
San Dimas, CA
- Average rainfall in May: 0.24"
The wettest month (with the highest rainfall) is February (1.46").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in May
San Dimas, CA
- Average rainfall days in May: 3.4 days
The month with the highest number of rainy days is March (6.3 days).
The month with the least rainy days is June (1.2 days).
Average daylight in May /
Average sunshine in May
San Dimas, CA
- Average daylight in May: 14h and 0min
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 5min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 7h and 0min).
Average sunshine days in May
San Dimas, CA
- Average sunshine days in May: 25.9 days
The month with the most sunshine days is June (27.8 days).
The month with the least sunshine days is February (22 days).
Average UV index in May
San Dimas, CA
- Average UV index in May: 5
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in May
San Dimas, CA
- Average cloud cover in May: 12
The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in May
San Dimas, 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).
San Dimas, California, USA
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