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 snowfall 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
In May, Rialto notes an average high-temperature of a warm 76.6°F (24.8°C), hardly different from the preceding month. In May, the nighttime temperature plummets remarkably from the daily apex to a steady average of 52.3°F (11.3°C).Humidity
In Rialto, the average relative humidity in May is 51%.Rainfall
In Rialto, during May, the rain falls for 3.3 days and regularly aggregates up to 0.12" (3mm) of precipitation. Throughout the year, in Rialto, there are 43.5 rainfall days, and 5.43" (138mm) of precipitation is accumulated.Snowfall
In Rialto, California, snow does not fall in January, March through December.Daylight
In Rialto, the average length of the day in May is 13h and 57min.On the first day of May, sunrise is at 5:59 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 5:38 am and sunset at 7:55 pm PDT.
Sunshine
The average sunshine in May is 11.8h.UV index
In May, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In May, the maximum UV index of 6 transforms into these recommendations:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature in Rialto?
What is the average humidity in May in Rialto?
How many days does it rain in May in Rialto?
When it does not snow in Rialto?
How many hours of daylight does Rialto have in May?
When are sunrise and sunset in May in Rialto?
How long on average sun shines in May in Rialto?
What is the UV index intensity in May in Rialto?
Average temperature in May
Rialto, CA
- Average high temperature in May: 76.6°F
The warmest month (with the highest average high temperature) is August (91.9°F).
The month with the lowest average high temperature is December (59.9°F).
- Average low temperature in May: 52.3°F
The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (43.3°F).
Average pressure in May
Rialto, CA
- Average pressure in May: 29.89"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in May
Rialto, CA
- Average wind speed in May: 6mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).
Average humidity in May
Rialto, CA
- Average humidity in May: 51%
The months with the highest relative humidity are February and March (52%).
The month with the lowest relative humidity is August (38%).
Average rainfall in May
Rialto, CA
- Average rainfall in May: 0.12"
The wettest months (with the highest rainfall) are February and December (1.14").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in May
Rialto, CA
- Average rainfall days in May: 3.3 days
The month with the highest number of rainy days is December (5.5 days).
The month with the least rainy days is June (1.3 days).
Average snowfall days in May
Rialto, 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
Rialto, 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 month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in May
Rialto, CA
- Average sunshine days in May: 25.8 days
The month with the most sunshine days is June (27.8 days).
The month with the least sunshine days is February (22.6 days).
Average UV index in May
Rialto, CA
- Average UV index in May: 6
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in May
Rialto, CA
- Average cloud cover in May: 11
The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in May
Rialto, 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).
Rialto, California, USA
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