August weather forecast and climate
Monrovia, CA

Weather in August

August, the last month of the summer, in Monrovia, is also a hot month, with average temperature ranging between min 64.8°F (18.2°C) and max 88.2°F (31.2°C).

Temperature

August is the warmest month, with an average high-temperature of 88.2°F (31.2°C) and an average low-temperature of 64.8°F (18.2°C).

Heat index

In August, the average heat index is evaluated at a tropical 90.3°F (32.4°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'felt air temperature', or 'feels like', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, wind, metabolic differences). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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

In Monrovia, California, the average relative humidity in August is 47%.

Rainfall

In Monrovia, California, during August, the rain falls for 1.9 days and regularly aggregates up to 0.12" (3mm) of precipitation. Throughout the year, in Monrovia, there are 50.9 rainfall days, and 8.46" (215mm) of precipitation is accumulated.

Daylight

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

Sunshine

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

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index in Monrovia. A UV Index estimate of 6 to 7 represents a high threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
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 warmest month in Monrovia?

The warmest month is August, with an average high-temperature of 88.2°F (31.2°C) and an average low-temperature of 64.8°F (18.2°C).

What is the temperature in August in Monrovia?

The average high-temperature, in August, in Monrovia, California, is 88.2°F (31.2°C), while the average low-temperature is 64.8°F (18.2°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), that calculates temperature value influenced by the moisture in the air, is estimated at 90.3°F (32.4°C).

What is the average humidity in August in Monrovia?

In Monrovia, the average relative humidity in August is 47%.

How many days does it rain in August in Monrovia?

In Monrovia, California, in August, it is raining for 1.9 days, with typically 0.12" (3mm) of accumulated precipitation.

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

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

How many hours of sunshine does Monrovia have in August?

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

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

Months with the highest UV index in Monrovia, California, are June through September, with an average maximum UV index of 6.

What is the UV index intensity in August in Monrovia?

In Monrovia, California, the average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to the Sun's UV rays.

Average temperature in August
Monrovia, CA

Average temperature in August - Monrovia, CA
  • Average high temperature in August: 88.2°F

The warmest month (with the highest average high temperature) is August (88.2°F).
The month with the lowest average high temperature is December (61.7°F).

  • Average low temperature in August: 64.8°F

The month with the highest average low temperature is August (64.8°F).
The coldest month (with the lowest average low temperature) is December (45.7°F).

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Average pressure in August
Monrovia, CA

Average pressure in August - Monrovia, CA
  • Average pressure in August: 29.89"

The month with the highest atmospheric pressure is January (30.11").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed in August
Monrovia, CA

Average wind speed in August - Monrovia, CA
  • Average wind speed in August: 4.6mph

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

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Average humidity in August
Monrovia, CA

Average humidity in August - Monrovia, CA
  • Average humidity in August: 47%

Months with the highest relative humidity are March and May (56%).
The month with the lowest relative humidity is November (46%).

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Average rainfall in August
Monrovia, CA

Average rainfall in August - Monrovia, CA
  • Average rainfall in August: 0.12"

The wettest months (with the highest rainfall) are February and December (1.77").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in August
Monrovia, CA

Average rainfall days in August - Monrovia, CA
  • Average rainfall days in August: 1.9 days

The month with the highest number of rainy days is March (7.4 days).
The month with the least rainy days is June (1.1 days).

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

Average daylight in August / Average sunshine in August - Monrovia, 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: 12h

The month with the most sunshine is July (Average sunshine: 12.1h).
Months with the least sunshine are January, February and December (Average sunshine: 6.9).

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Average sunshine days in August
Monrovia, CA

Average sunshine days in August - Monrovia, CA
  • Average sunshine days in August: 27.8 days

The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (21 days).

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Average UV index in August
Monrovia, CA

Average UV index in August - Monrovia, CA
  • Average UV index in August: 6

Months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in August
Monrovia, CA

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

Months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in August
Monrovia, CA

Average visibility in August - Monrovia, 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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