August weather forecast
Riverdale, CA

Weather in August

August, the last month of the summer in Riverdale, is another torrid month, with an average temperature ranging between max 100.9°F (38.3°C) and min 66.2°F (19°C).

Temperature

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

Humidity

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

Rainfall

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

Daylight

The average length of the day in August is 13h and 30min.
On the first day of the month, sunrise is at 6:06 am and sunset at 8:05 pm. On the last day of August, sunrise is at 6:30 am and sunset at 7:29 pm PDT.

Sunshine

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

UV index

June through August, with an average maximum UV index of 7, are months with the highest UV index in Riverdale, California. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In August, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in August in Riverdale?

The average high-temperature, in August, in Riverdale, is 100.9°F (38.3°C), while the average low-temperature is 66.2°F (19°C). in May, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, is computed to be 82.4°F (28°C).

What is the average humidity in August in Riverdale?

In August, the average relative humidity is 31%.

What is the driest month in Riverdale?

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

How much does it rain in Riverdale in August?

In Riverdale, California, in August, during 0.8 rainfall days, 0.08" (2mm) of precipitation is typically accumulated.

How many hours of daylight does Riverdale have in August?

In Riverdale, the average day length in August is 13h and 30min.

What time are sunrise and sunset in August in Riverdale?

In August, on the first day of the month, sunrise is at 6:06 am and sunset at 8:05 pm. On the last day of the month, in Riverdale, California, sunrise is at 6:30 am and sunset at 7:29 pm PDT.

How long on average sun shines in August in Riverdale?

The average sunshine duration in August in Riverdale is 12h.

What is the month with the highest UV index in Riverdale?

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

What is the UV index reading in August in Riverdale?

In August, the average daily maximum UV index in Riverdale is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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%

The 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: 13h and 30min

The month with the longest days is June (Average daylight: 14h and 37min).
The month with the shortest days is December (Average daylight: 9h and 43min).

  • 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 24min).

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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

The months with the highest UV index are June, July and August (UV index 7).
The 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

The 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

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).

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