August weather forecastHelena, MT
August
Weather in August
August in Helena maintains the summer heat, albeit with a slight dip in temperature from July's peak. With an average high of 78.1°F (25.6°C), the weather remains intertwined with warmth and long daylight hours. August is also distinguished by a low average rainfall of 0.87" (22mm). The surroundings reverberate with summer's vibrancy, beckoning tourists and locals alike to explore Helena's enthralling outdoors. However, as August progresses, signs of the approaching autumn become increasingly evident.Temperature
In August, Helena experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 80.2°F (26.8°C) in July to a still warm 78.1°F (25.6°C). Despite the drastic temperature difference, Helena records an average nighttime low of 50.2°F (10.1°C) throughout August.Humidity
The months with the lowest humidity in Helena are July and August, with an average relative humidity of 46%.Rainfall
In Helena, in August, during 9.1 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. Throughout the year, there are 123.7 rainfall days, and 12.4" (315mm) of precipitation is accumulated.Snowfall
June through August are months without snowfall in Helena.Daylight
In Helena, the average length of the day in August is 14h and 8min.On the first day of the month, sunrise is at 6:09 am and sunset at 8:58 pm. On the last day of August, in Helena, sunrise is at 6:47 am and sunset at 8:08 pm MDT.
Sunshine
The average sunshine in August is 11.5h.UV index
The average daily maximum UV index in August is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum UV index of 4 during August translates into these guidelines:
Exercise prevention - Protecting skin and eyes from harm is required. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Helena, MT
- Average high temperature in August: 78.1°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (27.7°F).
- Average low temperature in August: 50.2°F
The month with the highest average low temperature is July (50.4°F).
The coldest month (with the lowest average low temperature) is December (14.2°F).
Average pressure in August
Helena, MT
- Average pressure in August: 29.95"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in August
Helena, MT
- Average wind speed in August: 5mph
The windiest month (with the highest average wind speed) is November (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in August
Helena, MT
- Average humidity in August: 46%
The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are July and August (46%).
Average rainfall in August
Helena, MT
- Average rainfall in August: 0.87"
The wettest month (with the highest rainfall) is June (2.01").
The driest months (with the least rainfall) are January and December (0.63").
Average rainfall days in August
Helena, MT
- Average rainfall days in August: 9.1 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is November (7 days).
Average snowfall in August
Helena, MT
- Average snowfall in August: 0"
The month with the highest snowfall is February (6.18").
The months with the least snowfall are June, July and August (0").
Average snowfall days in August
Helena, MT
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (16.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in August /
Average sunshine in August
Helena, MT
- Average daylight in August: 14h and 6min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in August: 11h and 30min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in August
Helena, MT
- Average sunshine days in August: 19.5 days
The month with the most sunshine days is July (20.5 days).
The month with the least sunshine days is April (9.8 days).
Average UV index in August
Helena, MT
- Average UV index in August: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in August
Helena, MT
- Average cloud cover in August: 15
The month with the most cloud cover is February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in August
Helena, MT
- Average visibility in August: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
