August weather forecast
Riverdale, CA

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Weather in August

The last month of the summer, August, is also a sweltering month in Riverdale, California, with an average temperature varying between 66.2°F (19°C) and 100.9°F (38.3°C).

Temperature

The beginning of August reveals an average high-temperature of a still fiery hot 100.9°F (38.3°C), showing minimal deviation from the previous month. In August, Riverdale endures a notable temperature shift from day to night, with lows averaging at a comfortable 66.2°F (19°C).

Humidity

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

Rainfall

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

Daylight

In August, the average length of the day in Riverdale is 13h and 30min.
On the first day of August in Riverdale, California, sunrise is at 6:06 am and sunset at 8:04 pm. On the last day of the month, sunrise is at 6:30 am and sunset at 7:28 pm PDT.

Sunshine

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. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: During August, 7 as the daily maximum UV index converts into the following advice:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
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Frequently asked questions

How hot is it in Riverdale in August?

The high-temperature, in August, in Riverdale, records 100.9°F (38.3°C), while the low-temperature is 66.2°F (19°C). In May, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is appraised at 82.4°F (28°C).

What is the average humidity in August in Riverdale?

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

What is the driest month in Riverdale?

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

How much does it rain in Riverdale in August?

In Riverdale, California, in August, it is raining for 0.8 days, with typically 0.08" (2mm) of accumulated precipitation.

How many hours of daylight does Riverdale have in August?

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

When is the sunrise / sunset in August in Riverdale?

In August, on the first day of the month, sunrise is at 6:06 am and sunset at 8:04 pm. On the last day of the month, in Riverdale, California, sunrise is at 6:30 am and sunset at 7:28 pm PDT.

How long on average sun shines in August in Riverdale?

In Riverdale, California, the average sunshine duration in August 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, California.

How high is the UV index in August in Riverdale?

The average daily maximum UV index in August is 7. A UV Index of 6 to 7 symbolizes a high hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
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 3min

The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • 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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Riverdale, California, USA

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