Boise
Idaho, USA
Long-term weather forecast
Long-term weather forecast

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
August, the last month of the summer, in Boise, is another hot month, with average temperature ranging between max 89.8°F (32.1°C) and min 59.5°F (15.3°C).

Temperature

In Boise, the average high-temperature in August is almost the same as in July - a still tropical 89.8°F (32.1°C). The average low-temperature, in Boise, is 59.5°F (15.3°C).

Humidity

The average relative humidity in Boise is 37.2%.

Rainfall

August is the month with the least rainfall. Rain falls for 2.4 days and accumulates 0.2" (6.1mm) of precipitation.

Snowfall

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

Daylight

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

Sunshine

In Boise, the average sunshine in August is 11.6h.

UV index

In August, the average daily maximum UV index in Boise is 8. A UV Index of 8 to 10 symbolizes a very high health risk from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 8 interpret into the following advice:
Take special precautions, as unprotected skin can be damaged and can burn quickly. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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?

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

What is the average humidity in August in Boise?

In August, the average relative humidity in Boise, Idaho, is 37.2%.

How many days does it rain in August in Boise?

In Boise, Idaho, in August, during 2.4 rainfall days, 0.2" (6.1mm) of precipitation is typically accumulated.

What is the driest month in Boise?

August is the month with the least rainfall in Boise. Rain falls for 2.4 days and accumulates 0.2" (6.1mm) of precipitation.

When it does not snow in Boise?

May through September are months without snowfall.

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

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

How long on average sun shines in August in Boise?

In Boise, the average sunshine in August is 11.6h.

What is the UV index reading in August in Boise?

In Boise, the average daily maximum UV index in August is 8. A UV Index estimate of 8 to 10 represents a very high health risk from unprotected exposure to the UV radiation.
Average temperature in August - Boise, ID
  • Average high temperature in August: 89.7°F

The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is December (37.5°F).

  • Average low temperature in August: 59.6°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is December (24°F).

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: 0.2"

The wettest month (with the highest rainfall) is December (1.6").
The driest month (with the lowest rainfall) is August (0.2").

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: 0"

The month with the highest snowfall is December (7").
Months with the lowest snowfall are May, June, July, August and September (0").

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).