August weather forecast and climate
Boise, ID

The golden fall season in Boise, Idaho, with the tall city buildings
The golden fall season in Boise, Idaho, with the tall city buildings
The last month of the summer, August, is another hot month in Boise, Idaho, with average temperature varying between 86.5°F (30.3°C) and 61.3°F (16.3°C).

Temperature

In Boise, the average high-temperature in August is practically the same as in July - a still tropical 86.5°F (30.3°C). In August, the average low-temperature is 61.3°F (16.3°C).

Humidity

The average relative humidity in August is 31%.

Rainfall

In August, in Boise, the rain falls for 4.9 days. Throughout August, 0.24" (6mm) of precipitation is accumulated. Throughout the year, in Boise, there are 116.8 rainfall days, and 15.08" (383mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Boise.

Daylight

In August, the average length of the day in Boise is 13.9h.

Sunshine

In August, the average sunshine is 11.4h.

UV index

In Boise, Idaho, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in August in Boise?

The average high-temperature, in August, in Boise, Idaho, is 86.5°F (30.3°C), while the average low-temperature is 61.3°F (16.3°C).

What is the average humidity in August in Boise?

In August, the average relative humidity in Boise, Idaho, is 31%.

How many days does it rain in August in Boise?

In Boise, in August, during 4.9 rainfall days, 0.24" (6mm) of precipitation is typically accumulated.

When it does not snow in Boise?

In Boise, Idaho, snow does not fall in May through October.

What is the average length of the day in August in Boise?

In August, the average length of the day in Boise, Idaho, is 13.9h.

How long on average sun shines in August in Boise?

In Boise, Idaho, the average sunshine in August is 11.4h.

How high is the UV index in August in Boise?

The average daily maximum UV index in August is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV rays.
Average temperature in August - Boise, ID
  • Average high temperature in August: 30.3°C

The warmest month (with the highest average high temperature) is July (31°C).
The month with the lowest average high temperature is December (1.5°C).

  • Average low temperature in August: 16.3°C

The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is December (-4.9°C).

Average pressure in August - Boise, ID
  • Average pressure in August: 1012.7mbar

The month with the highest atmospheric pressure is January (1024.4mbar).
The month with the lowest atmospheric pressure is June (1012.6mbar).

Average wind speed in August - Boise, ID
  • Average wind speed in August: 8.7km/h

The windiest month (with the highest average wind speed) is April (11.4km/h).
The calmest month (with the lowest average wind speed) is January (8.4km/h).

Average humidity in August - Boise, ID
  • Average humidity in August: 31%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (30%).

Average rainfall in August - Boise, ID
  • Average rainfall in August: 6mm

The wettest month (with the highest rainfall) is March (56mm).
The driest month (with the least rainfall) is July (5mm).

Average rainfall days in August - Boise, ID
  • Average rainfall days in August: 4.9 days

The month with the highest number of rainy days is March (16.2 days).
The month with the least rainy days is July (4.5 days).

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

The month with the highest snowfall is December (169mm).
Months with the least snowfall are May, June, July, August, September and October (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 (9.2 days).
Months with the least snowfall days are 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 the shortest days is December (Average daylight: 9h).

  • Average sunshine in August: 11.4h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.5h).

Average sunshine days in August - Boise, ID
  • Average sunshine days in August: 21.7 days

The month with the most sunshine days is July (23.6 days).
The month with the least sunshine days is March (12.1 days).

Average UV index in August - Boise, ID
  • Average UV index in August: 5

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in August - Boise, ID
  • Average cloud cover in August: 9

The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 8).

Average visibility in August - Boise, ID
  • Average visibility in August: 10km

Months with the highest visibility are March, April, May, June, July, August, September, October and November (10km).
The month with the lowest visibility is January (8km).