June weather forecastRialto, CA
June
Weather in June
June, the first month of the summer in Rialto, is also a moderately hot month, with an average temperature fluctuating between 85.5°F (29.7°C) and 57.7°F (14.3°C).Temperature
In Rialto, the onset of June comes with a modest high-temperature shift, transitioning from May's warm 76.6°F (24.8°C) to a still moderately hot 85.5°F (29.7°C). Rialto registers a marked temperature plunge to a mild 57.7°F (14.3°C) during the cool June nights.Heat index
In June, the average heat index is appraised at a hot 86°F (30°C). If one endures exposure and continues to be active, it might result in tiredness and heat cramps.The metrics for the heat index are tailored for both shady environments and light winds. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', reflects the feeling of heat when considering both air temperature and humidity. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
Humidity
In Rialto, California, the average relative humidity in June is 46%.Rainfall
The month with the least rainfall in Rialto is June, when the rain falls for 1.3 days and typically collects 0.04" (1mm) of precipitation.Snowfall
In Rialto, California, snow does not fall in January, March through December.Daylight
June has the longest days of the year in Rialto, with an average of 14h and 24min of daylight.On the first day of June in Rialto, California, sunrise is at 5:38 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 8:05 pm PDT.
Sunshine
June and July, with an average of 12.1h of sunshine, are months with the most sunshine.UV index
June through August, with an average maximum UV index of 7, are months with the highest UV index in Rialto. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 7 in June translates into these instructions:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in June
Rialto, CA
- Average high temperature in June: 85.5°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 June: 57.7°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 June
Rialto, CA
- Average pressure in June: 29.85"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 June
Rialto, CA
- Average wind speed in June: 5.7mph
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 June
Rialto, CA
- Average humidity in June: 46%
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 June
Rialto, CA
- Average rainfall in June: 0.04"
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 June
Rialto, CA
- Average rainfall days in June: 1.3 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 June
Rialto, CA
- Average snowfall days in June: 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 June /
Average sunshine in June
Rialto, CA
- Average daylight in June: 14h and 24min
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 June: 12h and 6min
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 June
Rialto, CA
- Average sunshine days in June: 27.8 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 June
Rialto, CA
- Average UV index in June: 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 June
Rialto, CA
- Average cloud cover in June: 6
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 June
Rialto, CA
- Average visibility in June: 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).
