August weather forecast and climate
Riverside, CA

The neon-lit buildings of Riverside, California, and a silhouette of the high mountain in the back
The neon-lit buildings of Riverside, California, and a silhouette of the high mountain in the back

Weather in August

August, the last month of the summer, in Riverside, is another hot month, with average temperature varying between 66.4°F (19.1°C) and 91.2°F (32.9°C).

Temperature

The warmest month is August, with an average high-temperature of 91.2°F (32.9°C) and an average low-temperature of 66.4°F (19.1°C).

Heat index

The average heat index is calculated to be a tropical 93.7°F (34.3°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like clothing, differences in body mass, height, and shape, wind, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

With an average relative humidity of 43%, August is the least humid month.

Rainfall

In Riverside, during August, the rain falls for 1.7 days and regularly aggregates up to 0.08" (2mm) of precipitation. In Riverside, during the entire year, the rain falls for 49 days and collects up to 7.32" (186mm) of precipitation.

Snowfall

January, March through December are months without snowfall.

Daylight

The average length of the day in August is 13.4h.

Sunshine

Months with the most sunshine are July and August, with an average of 12.1h of sunshine.

UV index

July and August, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 7 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the warmest month in Riverside?

With an average high-temperature of 91.2°F (32.9°C) and an average low-temperature of 66.4°F (19.1°C), August is the warmest month.

What is the temperature in August in Riverside?

In Riverside, in August, the average high-temperature is 91.2°F (32.9°C), and the average low-temperature is 66.4°F (19.1°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, is calculated to be 93.7°F (34.3°C).

What is the least humid month in Riverside?

With an average relative humidity of 43%, August is the least humid month in Riverside, California.

What is the average humidity in August in Riverside?

In August, the average relative humidity is 43%.

How many days does it rain in August in Riverside?

In Riverside, California, in August, during 1.7 rainfall days, 0.08" (2mm) of precipitation is typically accumulated.

When it does not snow in Riverside?

January, March through December are months without snowfall in Riverside.

What is the average length of the day in August in Riverside?

In August, the average length of the day in Riverside is 13.4h.

What are the months with the most sunshine in Riverside?

Months with the most sunshine are July and August, with an average of 12.1h of sunshine.

How long on average sun shines in August in Riverside?

The average sunshine in August in Riverside, California, is 12.1h.

When is the highest UV index in Riverside?

Months with the highest UV index are July and August, with an average maximum UV index of 7.

What is the UV index reading in August in Riverside?

In Riverside, the average daily maximum UV index in August is 7. A UV Index of 6 to 7 symbolizes a high hazard to health from the exposure to the Sun's UV radiation.

Average temperature in August
Riverside, CA

Average temperature in August - Riverside, CA
  • Average high temperature in August: 91.2°F

The warmest month (with the highest average high temperature) is August (91.2°F).
The month with the lowest average high temperature is December (63.3°F).

  • Average low temperature in August: 66.4°F

The month with the highest average low temperature is August (66.4°F).
The coldest month (with the lowest average low temperature) is December (45.9°F).

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Average pressure in August
Riverside, CA

Average pressure in August - Riverside, CA
  • Average pressure in August: 29.88"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.86").

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Average wind speed in August
Riverside, CA

Average wind speed in August - Riverside, CA
  • Average wind speed in August: 4.7mph

The windiest month (with the highest average wind speed) is May (5.6mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

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Average humidity in August
Riverside, CA

Average humidity in August - Riverside, CA
  • Average humidity in August: 43%

The month with the highest relative humidity is May (56%).
The month with the lowest relative humidity is August (43%).

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Average rainfall in August
Riverside, CA

Average rainfall in August - Riverside, CA
  • Average rainfall in August: 0.08"

The wettest months (with the highest rainfall) are February and December (1.61").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in August
Riverside, CA

Average rainfall days in August - Riverside, CA
  • Average rainfall days in August: 1.7 days

The month with the highest number of rainy days is March (7.7 days).
The month with the least rainy days is June (1.1 days).

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Average snowfall days in August
Riverside, CA

Average snowfall days in August - Riverside, CA
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is February (0.1 days).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in August /
Average sunshine in August
Riverside, CA

Average daylight in August / Average sunshine in August - Riverside, CA
  • Average daylight in August: 13.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in August: 12.1h

Months with the most sunshine are July and August (Average sunshine: 12.1h).
Months with the least sunshine are February and December (Average sunshine: 6.8).

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Average sunshine days in August
Riverside, CA

Average sunshine days in August - Riverside, CA
  • Average sunshine days in August: 26.9 days

The month with the most sunshine days is June (27.9 days).
The month with the least sunshine days is February (21.6 days).

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Average UV index in August
Riverside, CA

Average UV index in August - Riverside, CA
  • Average UV index in August: 7

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).

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Average cloud cover in August
Riverside, CA

Average cloud cover in August - Riverside, CA
  • Average cloud cover in August: 5

Months with the most cloud cover are February and March (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in August
Riverside, CA

Average visibility in August - Riverside, CA
  • Average visibility in August: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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