August weather forecast
Modesto, CA

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Weather in August

The last month of the summer, August, is also a fiery hot month in Modesto, California, with temperature in the range of an average low of 61.7°F (16.5°C) and an average high of 96.4°F (35.8°C).

Temperature

August's arrival brings an average high-temperature of a still fiery hot 96.4°F (35.8°C), slightly deviating from July's 97.7°F (36.5°C). The August nights in Modesto bear witness to a significant drop from the daytime highs, settling at an average temperature of 61.7°F (16.5°C).

Heat index

In August, the heat index is calculated to be a sweltering 102.2°F (39°C). Implement enhanced safety actions, heat cramps and heat exhaustion could occur. Sustained activity might result in heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'real feel' or 'feels like', melds the effects of warmth and moisture to generate a feeling of heat. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. Higher relative humidity impedes evaporation, thus reducing heat dispersion from the body, culminating in a sensation of overheating. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.

Humidity

In Modesto, the average relative humidity in August is 40%.

Rainfall

The months with the least rainfall in Modesto, California, are July and August Rain falls for 0.9 days and accumulates 0.04" (1mm) of rain.

Daylight

In August, the average length of the day is 13h and 34min.
On the first day of August, sunrise is at 6:08 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 6:34 am and sunset at 7:34 pm PDT.

Sunshine

In Modesto, 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. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In August, a regular UV index of 7 translates into these guidelines:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.

Frequently asked questions

How hot does it get in Modesto in August?

August temperatures in Modesto vary between a high-temperature of 96.4°F (35.8°C) and a low-temperature of 61.7°F (16.5°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is calculated to be 102.2°F (39°C).

What is the average humidity in August in Modesto?

In Modesto, the average relative humidity in August is 40%.

What is the driest month in Modesto?

July and August are months with the least rain in Modesto, California, when the rain falls for 0.9 days and typically aggregates up to 0.04" (1mm) of rain.

How many days does it rain in August in Modesto?

In August, in Modesto, California, the rain falls for 0.9 days. Throughout August, 0.04" (1mm) of precipitation is accumulated.

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

In August, the average day length in Modesto is 13h and 34min.

When are sunrise and sunset in August in Modesto?

In August, on the first day of the month, sunrise is at 6:08 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 6:34 am and sunset at 7:34 pm PDT.

How long on average sun shines in August in Modesto?

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

When is the highest UV index in Modesto?

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

What is the UV index intensity in August in Modesto?

In Modesto, California, the average daily maximum UV index in August is 7. A UV Index of 6 to 7 symbolizes a high health risk 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
Modesto, CA

Average temperature in August - Modesto, CA
  • Average high temperature in August: 96.4°F

The warmest month (with the highest average high temperature) is July (97.7°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in August: 61.7°F

The month with the highest average low temperature is July (62.1°F).
The coldest months (with the lowest average low temperature) are January and December (41.9°F).

Average pressure in August
Modesto, CA

Average pressure in August - Modesto, CA
  • Average pressure in August: 29.92"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in August
Modesto, CA

Average wind speed in August - Modesto, CA
  • Average wind speed in August: 6.5mph

The windiest month (with the highest average wind speed) is June (7.3mph).
The calmest month (with the lowest average wind speed) is November (5.2mph).

Average humidity in August
Modesto, CA

Average humidity in August - Modesto, CA
  • Average humidity in August: 40%

The month with the highest relative humidity is January (72%).
The month with the lowest relative humidity is July (37%).

Average rainfall in August
Modesto, CA

Average rainfall in August - Modesto, CA
  • Average rainfall in August: 0.04"

The wettest month (with the highest rainfall) is March (1.3").
The driest months (with the least rainfall) are July and August (0.04").

Average rainfall days in August
Modesto, CA

Average rainfall days in August - Modesto, CA
  • Average rainfall days in August: 0.9 days

The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is August (0.9 days).

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

Average daylight in August / Average sunshine in August - Modesto, CA
  • Average daylight in August: 13h and 4min

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

  • Average sunshine in August: 12h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

Average sunshine days in August
Modesto, CA

Average sunshine days in August - Modesto, CA
  • Average sunshine days in August: 29.2 days

The month with the most sunshine days is August (29.2 days).
The month with the least sunshine days is March (19.6 days).

Average UV index in August
Modesto, CA

Average UV index in August - Modesto, 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, February, November and December (UV index 3).

Average cloud cover in August
Modesto, CA

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

The month with the most cloud cover is March (Cloud cover 33).
The month with the least cloud cover is July (Cloud cover 4).

Average visibility in August
Modesto, CA

Average visibility in August - Modesto, 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).

Modesto, California, USA

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