August weather forecastCuster, MT
August
Weather in August
The last month of the summer, August, is also a moderately hot month in Custer, Montana, with temperature in the range of an average low of 63.1°F (17.3°C) and an average high of 84.7°F (29.3°C).Temperature
August's average high-temperature stands at a moderately hot 84.7°F (29.3°C), showing little deviation from July's 86.5°F (30.3°C). Custer logs a considerable temperature decrease from the daytime highs during the nights in August, with an average reading of 63.1°F (17.3°C).Humidity
With an average relative humidity of 38%, August is the least humid month.Rainfall
In Custer, in August, during 9.8 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. Throughout the year, there are 107 rainfall days, and 12.17" (309mm) of precipitation is accumulated.Snowfall
In Custer, snow does not fall in June through August.Daylight
The average length of the day in August is 14h and 6min.On the first day of August, sunrise is at 5:53 am and sunset at 8:39 pm. On the last day of the month, sunrise is at 6:30 am and sunset at 7:49 pm MDT.
Sunshine
In August, the average sunshine is 11.7h.UV index
In Custer, the average daily maximum UV index in August is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: In August, the maximum UV index of 6 translates into these guidelines:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Custer, MT
- Average high temperature in August: 84.7°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The months with the lowest average high temperature are January and December (31.1°F).
- Average low temperature in August: 63.1°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (17.6°F).
Average pressure in August
Custer, MT
- Average pressure in August: 29.89"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in August
Custer, MT
- Average wind speed in August: 8.2mph
The windiest month (with the highest average wind speed) is April (10.2mph).
The calmest months (with the lowest average wind speed) are July and August (8.2mph).
Average humidity in August
Custer, MT
- Average humidity in August: 38%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (38%).
Average rainfall in August
Custer, MT
- Average rainfall in August: 0.98"
The wettest month (with the highest rainfall) is May (1.85").
The driest month (with the least rainfall) is December (0.55").
Average rainfall days in August
Custer, MT
- Average rainfall days in August: 9.8 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is December (4.5 days).
Average snowfall in August
Custer, MT
- Average snowfall in August: 0"
The month with the highest snowfall is February (4.29").
The months with the least snowfall are June, July and August (0").
Average snowfall days in August
Custer, MT
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (10.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in August /
Average sunshine in August
Custer, MT
- Average daylight in August: 14h and 6min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in August: 11h and 42min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in August
Custer, MT
- Average sunshine days in August: 17.1 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is April (13.5 days).
Average UV index in August
Custer, MT
- Average UV index in August: 6
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in August
Custer, MT
- Average cloud cover in August: 15
The month with the most cloud cover is February (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in August
Custer, MT
- 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).
