August weather forecast
Mount Shasta, CA

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The Lake Siskiyou on the base of Mount Shasta in California, and a view of the planted forest, the far suspension bridge, and snowy mountain peak
The Lake Siskiyou on the base of Mount Shasta in California, and a view of the planted forest, the far suspension bridge, and snowy mountain peak

Weather in August

August, the last month of the summer in Mount Shasta, is also a moderately hot month, with an average temperature varying between 83.5°F (28.6°C) and 51.8°F (11°C).

Temperature

At the start of August, Mount Shasta's average high-temperature reaches a still warm 83.5°F (28.6°C), subtly different from the preceding month. A marked drop from daytime peak temperatures to an average low-temperature of 51.8°F (11°C) is observed during the nights in August.

Heat index

The heat index value for August is calculated to be 84.2°F (29°C). Extended exposure and activity might lead to tiredness, potentially resulting in heat cramps.
For clarity, heat index numbers account for light winds and areas under shade. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', combines both the air temperature and the humidity level to give a perceived human temperature. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.

Humidity

August is the least humid month, with an average relative humidity of 45%.

Rainfall

In Mount Shasta, California, during August, the rain falls for 2.3 days and regularly aggregates up to 0.24" (6mm) of precipitation. In Mount Shasta, during the entire year, the rain falls for 90.7 days and collects up to 26.38" (670mm) of precipitation.

Snowfall

In Mount Shasta, snow does not fall in June through August.

Daylight

The average length of the day in August is 13h and 47min.
On the first day of the month, sunrise is at 6:05 am and sunset at 8:25 pm. On the last day of August, sunrise is at 6:35 am and sunset at 7:43 pm PDT.

Sunshine

The average sunshine in August is 12h.

UV index

In August, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: In August, the maximum UV index of 5 translates into these guidelines:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. When the Sun is at its strongest around midday, find shade and limit exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Updated: Jul 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is it in August?

The average high-temperature, in August, in Mount Shasta, is 83.5°F (28.6°C), while the average low-temperature is 51.8°F (11°C). The average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is calculated to be 84.2°F (29°C).

What is the least humid month?

With an average relative humidity of 45%, August is the least humid month.

What is the average humidity in August?

The average relative humidity in August is 45%.

How many days does it rain in August?

In Mount Shasta, in August, it is raining for 2.3 days, with typically 0.24" (6mm) of accumulated precipitation.

When it does not snow?

June through August are months without snowfall.

Does it snow in Mount Shasta in August?

In Mount Shasta, in August, it doesn't snow. In September, it regularly snows.

What is the average length of the day in August?

In Mount Shasta, the average day length in August is 13h and 47min.

When are sunrise and sunset in August?

On the first day of August, sunrise is at 6:05 am and sunset at 8:25 pm. On the last day of the month, sunrise is at 6:35 am and sunset at 7:43 pm PDT.

How long on average sun shines in August?

In August, the average sunshine duration is 12h.

What is the UV index reading in August?

In Mount Shasta, the average daily maximum UV index in August is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Mount Shasta, CA

Average temperature in August - Mount Shasta, CA
  • Average high temperature in August: 83.5°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (40.8°F).

  • Average low temperature in August: 51.8°F

The month with the highest average low temperature is July (52.2°F).
The coldest month (with the lowest average low temperature) is December (27.1°F).

Average pressure in August
Mount Shasta, CA

Average pressure in August - Mount Shasta, CA
  • Average pressure in August: 29.94"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are June and August (29.94"Hg).

Average wind speed in August
Mount Shasta, CA

Average wind speed in August - Mount Shasta, CA
  • Average wind speed in August: 3.9mph

The windiest month (with the highest average wind speed) is March (5.8mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).

Average humidity in August
Mount Shasta, CA

Average humidity in August - Mount Shasta, CA
  • Average humidity in August: 45%

The month with the highest relative humidity is March (81%).
The month with the lowest relative humidity is August (45%).

Average rainfall in August
Mount Shasta, CA

Average rainfall in August - Mount Shasta, CA
  • Average rainfall in August: 0.24"

The wettest month (with the highest rainfall) is March (4.69").
The driest month (with the least rainfall) is July (0.16").

Average rainfall days in August
Mount Shasta, CA

Average rainfall days in August - Mount Shasta, CA
  • Average rainfall days in August: 2.3 days

The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (2.3 days).

Average snowfall in August
Mount Shasta, CA

Average snowfall in August - Mount Shasta, CA
  • Average snowfall in August: 0"

The month with the highest snowfall is January (19.21").
The months with the least snowfall are June, July and August (0").

Average snowfall days in August
Mount Shasta, CA

Average snowfall days in August - Mount Shasta, CA
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is December (10.9 days).
The months with the least snowfall days are July and August (0 days).

Average daylight in August /
Average sunshine in August
Mount Shasta, CA

Average daylight in August / Average sunshine in August - Mount Shasta, CA
  • Average daylight in August: 13h and 5min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • 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: 5h and 24min).

Average sunshine days in August
Mount Shasta, CA

Average sunshine days in August - Mount Shasta, CA
  • Average sunshine days in August: 25.7 days

The months with the most sunshine days are July and August (25.7 days).
The month with the least sunshine days is March (12.3 days).

Average UV index in August
Mount Shasta, CA

Average UV index in August - Mount Shasta, CA
  • Average UV index in August: 5

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in August
Mount Shasta, CA

Average cloud cover in August - Mount Shasta, CA
  • Average cloud cover in August: 6

The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 6).

Average visibility in August
Mount Shasta, CA

Average visibility in August - Mount Shasta, CA
  • Average visibility in August: 6mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).

Mount Shasta, California, USA

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