August weather forecast and climate
Boise, ID

The golden fall season in Boise, Idaho, with the tall city buildings in view
The golden fall season in Boise, Idaho, with the tall city buildings in view

What is the temperature in August in Boise?

In August, in Boise, the average high-temperature is 89.8°F (32.1°C), and the average low-temperature is 59.5°F (15.3°C).

How much does it rain in Boise in August?

In August, the rain falls for 2.4 days. Throughout August, 0.2" (6.1mm) of precipitation is accumulated.
Average temperature in August - Boise, ID
  • Average high temperature in August: 32.1°C

The warmest month (with the highest average high temperature) is July (32.9°C).
The month with the lowest average high temperature is December (3.1°C).

  • Average low temperature in August: 15.3°C

The month with the highest average low temperature is July (15.8°C).
The coldest month (with the lowest average low temperature) is December (-4.4°C).

Average humidity in August - Boise, ID
  • Average humidity in August: 37.2%

The month with the highest relative humidity is January (75%).
The month with the lowest relative humidity is July (36.1%).

Average rainfall in August - Boise, ID
  • Average rainfall in August: 6.1mm

The wettest month (with the highest rainfall) is December (39.4mm).
The driest month (with the lowest rainfall) is August (6.1mm).

Average rainfall days in August - Boise, ID
  • Average rainfall days in August: 2.4 days

The month with the highest number of rainy days is December (11.8 days).
The month with the lowest number of rainy days is August (2.4 days).

Average snowfall in August - Boise, ID
  • Average snowfall in August: 0mm

The month with the highest snowfall is December (177.8mm).
Months with the lowest snowfall are May, June, July, August and September (0mm).

Average snowfall days in August - Boise, ID
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is December (6 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average daylight in August / Average sunshine in August - Boise, ID
  • Average daylight in August: 13.9h

The month with the longest days is June (Average daylight: 15.4h).
The month with shortest days is December (Average daylight: 9h).

  • Average sunshine in August: 11.6h

The month with most sunshine is July (Average sunshine: 12.9h).
The month with least sunshine is December (Average sunshine: 3.4h).

Average UV index in August - Boise, ID
  • Average UV index in August: 8

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 1).

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