Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
Rialto experiences its highest average temperatures in August, reaching a peak of 91.9°F (33.3°C) and a minimum of 65.8°F (18.8°C).Humidity
With an average relative humidity of 38%, August is the least humid month in Rialto.Rainfall
In Rialto, in August, during 2.2 rainfall days, 0.16" (4mm) of precipitation is typically accumulated. In Rialto, during the entire year, the rain falls for 43.5 days and collects up to 5.43" (138mm) of precipitation.Snowfall
January, March through December are months without snowfall.Daylight
In Rialto, the average length of the day in August is 13h and 23min.On the first day of the month, sunrise is at 6:01 am and sunset at 7:50 pm. On the last day of August, sunrise is at 6:22 am and sunset at 7:16 pm PDT.
Sunshine
In Rialto, the average sunshine in August is 12h.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In August, the maximum UV index of 7 suggests these recommendations:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the hottest in Rialto?
How hot does it get in Rialto in August?
What is the least humid month in Rialto?
What is the average humidity in August in Rialto?
How much does it rain in Rialto in August?
When it does not snow in Rialto?
What is the average length of the day in August in Rialto?
When is the sunrise / sunset in August in Rialto?
How many hours of sunshine does Rialto have in August?
What are the months with the highest UV index in Rialto?
What is the UV index intensity in August in Rialto?
Average temperature in August
Rialto, CA
- Average high temperature in August: 91.9°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 August: 65.8°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 August
Rialto, CA
- Average pressure in August: 29.87"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 August
Rialto, CA
- Average wind speed in August: 4.8mph
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 August
Rialto, CA
- Average humidity in August: 38%
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 August
Rialto, CA
- Average rainfall in August: 0.16"
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 August
Rialto, CA
- Average rainfall days in August: 2.2 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 August
Rialto, CA
- Average snowfall days in August: 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 August /
Average sunshine in August
Rialto, CA
- Average daylight in August: 13h and 2min
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 August: 12h and 0min
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 August
Rialto, CA
- Average sunshine days in August: 25.4 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 August
Rialto, CA
- Average UV index in August: 7
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 August
Rialto, CA
- Average cloud cover in August: 5
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 August
Rialto, CA
- Average visibility in August: 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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