Helena
Montana, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and Climate
Helena, MT

The State Capital building of Montana in Helena city, set on a beautiful natural park
The State Capital building of Montana in Helena city, set on a beautiful natural park
  • The average high temperature in August: 29.2°C

The warmest month (with the highest average high temperature) is July (29.8°C).
The month with the lowest average high temperature is December (-0.2°C).

  • The average low temperature in August: 11.2°C

The month with the highest average low temperature is July (12.4°C).
The coldest month (with the lowest average low temperature) is December (-11.2°C).

  • The average humidity in August: 47.5%

The month with the highest relative humidity is December (68.1%).
The month with the lowest relative humidity is July (46.4%).

  • The average rainfall in August: 30.5mm

The wettest month (with the highest rainfall) is June (52.3mm).
The driest month (with the lowest rainfall) is February (7.6mm).

  • The average rainfall days in August: 7.3 days

The month with the highest number of rainy days is June (11.2 days).
The month with the lowest number of rainy days is February (5.9 days).

  • The average snowfall in August: 7.6mm

The month with the highest snowfall is December (185.4mm).
Months with the lowest snowfall are June and July (0mm).

  • The average snowfall days in August: 0.1 days

The month with the highest number of snowfall days is December (6 days).
The month with the lowest number of snowfall days is July (0 days).

  • The average daylight in August: 14h

The month with the longest days is June (Average daylight: 16h).
Months with shortest days are January, November and December (Average daylight: 9h).

  • The average sunshine in August: 10.5h

The month with most sunshine is July (Average sunshine: 11.9h).
The month with least sunshine is December (Average sunshine: 3.2h).

  • The average UV index in August: 8

The month with the highest UV index is July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 1).

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