August weather forecast and climate
Riverdale, CA

Weather in August

August, the last month of the summer, in Riverdale, is another very hot month, with temperature in the range of an average high of 100.9°F (38.3°C) and an average low of 66.2°F (19°C).

Temperature

In Riverdale, California, the average high-temperature is almost the same as in July - a still very hot 100.9°F (38.3°C). The average low-temperature, in August, is 66.2°F (19°C).

Humidity

The average relative humidity in August is 31%.

Rainfall

The month with the least rainfall in Riverdale is August when the rain falls for 0.8 days and typically collects 0.08" (2mm) of precipitation.

Daylight

In August, the average length of the day in Riverdale is 13.5h.

Sunshine

In August, the average sunshine is 12h.

UV index

June through August, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 temperature in August in Riverdale?

In August, the average high-temperature is 100.9°F (38.3°C), and the average low-temperature is 66.2°F (19°C).

What is the average humidity in August in Riverdale?

In Riverdale, California, the average relative humidity in August is 31%.

How many days does it rain in August in Riverdale?

In August, in Riverdale, California, the rain falls for 0.8 days. Throughout August, 0.08" (2mm) of precipitation is accumulated.

What is the driest month in Riverdale?

August is the month with the least rainfall in Riverdale, California. Rain falls for 0.8 days and accumulates 0.08" (2mm) of precipitation.

How many hours of daylight does Riverdale have in August?

In August, the average length of the day in Riverdale, California, is 13.5h.

How long on average sun shines in August in Riverdale?

In August, the average sunshine in Riverdale, California, is 12h.

When is the highest UV index in Riverdale?

Months with the highest UV index are June through August, with an average maximum UV index of 7.

How high is the UV index in August in Riverdale?

The average daily maximum UV index in August is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in August
Riverdale, CA

Average temperature in August - Riverdale, CA
  • Average high temperature in August: 100.9°F

The warmest month (with the highest average high temperature) is July (102.2°F).
The month with the lowest average high temperature is December (57.2°F).

  • Average low temperature in August: 66.2°F

The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is December (43°F).

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Average pressure in August
Riverdale, CA

Average pressure in August - Riverdale, CA
  • Average pressure in August: 29.91"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.89").

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Average wind speed in August
Riverdale, CA

Average wind speed in August - Riverdale, CA
  • Average wind speed in August: 6.2mph

The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest months (with the lowest average wind speed) are January and November (4.8mph).

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Average humidity in August
Riverdale, CA

Average humidity in August - Riverdale, CA
  • Average humidity in August: 31%

Months with the highest relative humidity are January and December (66%).
The month with the lowest relative humidity is July (30%).

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Average rainfall in August
Riverdale, CA

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

The wettest months (with the highest rainfall) are January, February and March (1.54").
The driest month (with the least rainfall) is August (0.08").

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Average rainfall days in August
Riverdale, CA

Average rainfall days in August - Riverdale, CA
  • Average rainfall days in August: 0.8 days

The month with the highest number of rainy days is March (9.6 days).
The month with the least rainy days is August (0.8 days).

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

Average daylight in August / Average sunshine in August - Riverdale, CA
  • Average daylight in August: 13.5h

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in August: 12h

Months with the most sunshine are June and July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.4h).

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Average sunshine days in August
Riverdale, CA

Average sunshine days in August - Riverdale, CA
  • Average sunshine days in August: 29.3 days

The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is February (19.4 days).

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Average UV index in August
Riverdale, CA

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

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January, November and December (UV index 3).

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Average cloud cover in August
Riverdale, CA

Average cloud cover in August - Riverdale, CA
  • Average cloud cover in August: 4

Months with the most cloud cover are March and December (Cloud cover 28).
The month with the least cloud cover is August (Cloud cover 4).

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Average visibility in August
Riverdale, CA

Average visibility in August - Riverdale, 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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