Great Falls
Montana, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Great Falls, MT

A far view from on top of the vast Missouri River of the City of Lights, Great Falls, Montana, a dusk sky, mirror images in the water
A far view from on top of the vast Missouri River of the City of Lights, Great Falls, Montana, a dusk sky, mirror images in the water
August, the last month of the summer, in Great Falls, is another warm month, with average temperature varying between 50.4°F (10.2°C) and 82.2°F (27.9°C).

Temperature

In Great Falls, the average high-temperature in August is practically the same as in July - a still warm 82.2°F (27.9°C). In Great Falls, the average low-temperature is 50.4°F (10.2°C).

Rainfall

In Great Falls, during 7.9 rainfall days, 1.6" (39.9mm) of precipitation is typically accumulated. Throughout the year, there are 99.9 rainfall days, and 14.8" (374.8mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through June, August through December.

Daylight

The average length of the day in August is 14.2h.

Sunshine

The average sunshine in August is 10.7h.

UV index

In August, the average daily maximum UV index is 7. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to the UV radiation for the ordinary person.
In August, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in August in Great Falls?

In August, in Great Falls, Montana, the average high-temperature is 82.2°F (27.9°C), and the average low-temperature is 50.4°F (10.2°C).

How much does it rain in Great Falls in August?

In Great Falls, Montana, during August, the rain falls for 7.9 days and regularly aggregates up to 1.6" (39.9mm) of precipitation.

When does it start to snow in Great Falls?

August is the first month it typically snows in Great Falls, Montana. Throughout August, in the average 0.1 snowfall days, it receives 0.3" (7.6mm) of snow.

How many hours of daylight does Great Falls have in August?

In Great Falls, Montana, the average length of the day in August is 14.2h.

How many hours of sunshine does Great Falls have in August?

In Great Falls, Montana, the average sunshine in August is 10.7h.

What is the UV index intensity in August in Great Falls?

The average daily maximum UV index in August in Great Falls, Montana, is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to the UV radiation.
Average temperature in August - Great Falls, MT
  • Average high temperature in August: 82.3°F

The warmest month (with the highest average high temperature) is July (83.4°F).
The month with the lowest average high temperature is December (34.6°F).

  • Average low temperature in August: 50.4°F

The month with the highest average low temperature is July (51.4°F).
Coldest months (with the lowest average low temperature) are January and December (14.9°F).

Average rainfall in August - Great Falls, MT
  • Average rainfall in August: 1.6"

The wettest month (with the highest rainfall) is June (2.5").
Driest months (with the lowest rainfall) are January and February (0.5").

Average rainfall days in August - Great Falls, MT
  • Average rainfall days in August: 7.9 days

Months with the highest number of rainy days are May and June (11.7 days).
The month with the lowest number of rainy days is October (6.6 days).

Average snowfall in August - Great Falls, MT
  • Average snowfall in August: 0.3"

The month with the highest snowfall is March (11.9").
The month with the lowest snowfall is July (0").

Average snowfall days in August - Great Falls, MT
  • Average snowfall days in August: 0.1 days

The month with the highest number of snowfall days is March (7.8 days).
The month with the lowest number of snowfall days is July (0 days).

Average daylight in August / Average sunshine in August - Great Falls, MT
  • Average daylight in August: 14.2h

The month with the longest days is June (Average daylight: 15.9h).
The month with shortest days is December (Average daylight: 8.5h).

  • Average sunshine in August: 10.7h

The month with most sunshine is July (Average sunshine: 12.2h).
The month with least sunshine is December (Average sunshine: 3.4h).

Average UV index in August - Great Falls, MT
  • Average UV index in August: 7

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).