August weather forecast
Monrovia, CA

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Weather in August

The last month of the summer, August, is another hot month in Monrovia, California, with an average temperature fluctuating between 64.8°F (18.2°C) and 88.2°F (31.2°C).

Temperature

Monrovia witnesses the warmest weather in August, with temperatures averaging a high of 88.2°F (31.2°C) and a low of 64.8°F (18.2°C).

Heat index

The heat index value during August is evaluated at a hot 89.6°F (32°C). If one sustains activity during exposure, it could lead to a sense of fatigue, with a chance of heat cramps.
Given the heat index, its values are aligned with shaded sites and gentle winds. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', reflects the feeling of heat when considering both air temperature and humidity. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.

Humidity

In August, the average relative humidity is 47%.

Rainfall

In Monrovia, in August, during 1.9 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. Throughout the year, there are 50.9 rainfall days, and 8.46" (215mm) of precipitation is accumulated.

Daylight

The average length of the day in August in Monrovia, California, is 13h and 23min.
On the first day of the month, sunrise is at 6:03 am and sunset at 7:52 pm. On the last day of August, in Monrovia, California, sunrise is at 6:25 am and sunset at 7:18 pm PDT.

Sunshine

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

UV index

The months with the highest UV index are June through September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for average individuals.
Note: The maximum daily UV index of 6 during August translates into the following directions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
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Frequently asked questions

What month is the hottest in Monrovia?

August, with an average high of 88.2°F (31.2°C) and a low of 64.8°F (18.2°C), signifies the warmest month of the year in Monrovia.

Is it hot in Monrovia during August?

Monrovia in August has an average high-temperature of 88.2°F (31.2°C) and an average low-temperature of 64.8°F (18.2°C). In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is evaluated at 89.6°F (32°C).

What is the average humidity in August in Monrovia?

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

How many days does it rain in August in Monrovia?

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

How many hours of daylight does Monrovia have in August?

In Monrovia, the average day length in August is 13h and 23min.

When are sunrise and sunset in August in Monrovia?

On the first day of August in Monrovia, California, sunrise is at 6:03 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 6:25 am and sunset at 7:18 pm PDT.

How long on average sun shines in August in Monrovia?

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

When is the highest UV index in Monrovia?

June through September, with an average maximum UV index of 6, are months with the highest UV index.

What is the UV index intensity in August in Monrovia?

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

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"Hg

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

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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%

The 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: 13h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • 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 January, February and December (Average sunshine: 6h and 54min).

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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

The 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

The 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

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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Monrovia, California, USA

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