August weather forecast
Rancho Cucamonga, CA

Weather in August

The last month of the summer, August, is another hot month in Rancho Cucamonga, California, with an average temperature ranging between max 91.8°F (33.2°C) and min 66.6°F (19.2°C).

Temperature

August is the warmest month, with an average high-temperature of 91.8°F (33.2°C) and an average low-temperature of 66.6°F (19.2°C).

Heat index

In August, the average heat index is computed to be a hot 93.7°F (34.3°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. 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', 'feels like', or 'felt air temperature', 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, metabolic differences, differences in body mass, height, and shape, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the 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 41%, August is the least humid month in Rancho Cucamonga.

Rainfall

In Rancho Cucamonga, California, during August, the rain falls for 1.9 days and regularly aggregates up to 0.12" (3mm) of precipitation. In Rancho Cucamonga, during the entire year, the rain falls for 42.3 days and collects up to 4.53" (115mm) of precipitation.

Snowfall

In Rancho Cucamonga, snow does not fall in January, March through December.

Daylight

The average length of the day in August in Rancho Cucamonga is 13h and 23min.
On the first day of August in Rancho Cucamonga, sunrise is at 6:01 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 6:23 am and sunset at 7:17 pm PDT.

Sunshine

The average sunshine in August is 12h.

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 exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 7 in August transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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 Rancho Cucamonga?

The warmest month is August, with an average high-temperature of 91.8°F (33.2°C) and an average low-temperature of 66.6°F (19.2°C).

What is the temperature in August in Rancho Cucamonga?

In Rancho Cucamonga, in August, the average high-temperature is 91.8°F (33.2°C), and the average low-temperature is 66.6°F (19.2°C). In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is computed to be 93.7°F (34.3°C).

What is the least humid month in Rancho Cucamonga?

With an average relative humidity of 41%, August is the least humid month in Rancho Cucamonga, California.

What is the average humidity in August in Rancho Cucamonga?

In Rancho Cucamonga, the average relative humidity in August is 41%.

How many days does it rain in August in Rancho Cucamonga?

In Rancho Cucamonga, during August, the rain falls for 1.9 days and regularly aggregates up to 0.12" (3mm) of precipitation.

When it does not snow in Rancho Cucamonga?

In Rancho Cucamonga, California, snow does not fall in January, March through December.

How many hours of daylight does Rancho Cucamonga have in August?

The average day length in August in Rancho Cucamonga is 13h and 23min.

What time are sunrise and sunset in August in Rancho Cucamonga?

In August, on the first day of the month, sunrise is at 6:01 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 6:23 am and sunset at 7:17 pm PDT.

How long on average sun shines in August in Rancho Cucamonga?

The average sunshine duration in August in Rancho Cucamonga is 12h.

What are the months with the highest UV index in Rancho Cucamonga?

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

How high is the UV index in August in Rancho Cucamonga?

In Rancho Cucamonga, the average daily maximum UV index in August is 7. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Rancho Cucamonga, CA

Average temperature in August - Rancho Cucamonga, CA
  • Average high temperature in August: 91.8°F

The warmest month (with the highest average high temperature) is August (91.8°F).
The month with the lowest average high temperature is December (61.7°F).

  • Average low temperature in August: 66.6°F

The month with the highest average low temperature is August (66.6°F).
The coldest months (with the lowest average low temperature) are February and December (45.3°F).

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Average pressure in August
Rancho Cucamonga, CA

Average pressure in August - Rancho Cucamonga, CA
  • Average pressure in August: 29.88"Hg

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

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Average wind speed in August
Rancho Cucamonga, CA

Average wind speed in August - Rancho Cucamonga, CA
  • Average wind speed in August: 4.8mph

The windiest month (with the highest average wind speed) is May (5.9mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

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Average humidity in August
Rancho Cucamonga, CA

Average humidity in August - Rancho Cucamonga, CA
  • Average humidity in August: 41%

The months with the highest relative humidity are February, March and May (53%).
The month with the lowest relative humidity is August (41%).

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Average rainfall in August
Rancho Cucamonga, CA

Average rainfall in August - Rancho Cucamonga, CA
  • Average rainfall in August: 0.12"

The wettest month (with the highest rainfall) is February (0.98").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in August
Rancho Cucamonga, CA

Average rainfall days in August - Rancho Cucamonga, CA
  • Average rainfall days in August: 1.9 days

The month with the highest number of rainy days is March (6.3 days).
The month with the least rainy days is June (0.9 days).

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Average snowfall days in August
Rancho Cucamonga, CA

Average snowfall days in August - Rancho Cucamonga, CA
  • Average snowfall days in August: 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).

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Average daylight in August /
Average sunshine in August
Rancho Cucamonga, CA

Average daylight in August / Average sunshine in August - Rancho Cucamonga, CA
  • Average daylight in August: 13h and 23min

The month with the longest days is June (Average daylight: 14h and 23min).
The month with the shortest days is December (Average daylight: 9h and 56min).

  • Average sunshine in August: 12h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).

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Average sunshine days in August
Rancho Cucamonga, CA

Average sunshine days in August - Rancho Cucamonga, CA
  • Average sunshine days in August: 26.8 days

The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (22.8 days).

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Average UV index in August
Rancho Cucamonga, CA

Average UV index in August - Rancho Cucamonga, CA
  • Average UV index in August: 7

The 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
Rancho Cucamonga, CA

Average cloud cover in August - Rancho Cucamonga, CA
  • Average cloud cover in August: 5

The months with the most cloud cover are February and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in August
Rancho Cucamonga, CA

Average visibility in August - Rancho Cucamonga, 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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