August weather forecastBoise, ID
August
Weather in August
August sees the last phase of summer in Boise, Idaho. Despite lingering heat, slow but gradual temperature declines commence. The daylight duration decreases slightly while relative humidity doesn’t see a significant change. With increased cloud cover, the sunshine duration reduces, yet the heat continues to sustain due to lower precipitation. A slight fall in temperature after July's peak sees a high of approximately 86.5°F (30.3°C).Temperature
Boise experiences a recorded average high-temperature of a still tropical 86.5°F (30.3°C) in August, closely aligned with July's 87.8°F (31°C). In August, the nighttime temperature plummets remarkably from the daily apex to a steady average of 61.3°F (16.3°C).Humidity
In Boise, the average relative humidity in August is 31%.Rainfall
In Boise, in August, it is raining for 4.9 days, with typically 0.24" (6mm) of accumulated precipitation. Throughout the year, there are 116.8 rainfall days, and 15.08" (383mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In August, the average length of the day is 13h and 55min.On the first day of the month, sunrise is at 6:35 am and sunset at 9:07 pm. On the last day of August, sunrise is at 7:08 am and sunset at 8:21 pm MDT.
Sunshine
The average sunshine in August is 11.4h.UV index
In Boise, the average daily maximum UV index in August is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: In August, an average UV index of 5 transforms into the following instructions:
Make use of precautions - Suggestions to resist sunburn are communicated. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Boise, ID
- Average high temperature in August: 86.5°F
The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is December (34.7°F).
- Average low temperature in August: 61.3°F
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (23.2°F).
Average pressure in August
Boise, ID
- Average pressure in August: 29.91"Hg
The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in August
Boise, ID
- Average wind speed in August: 5.4mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (5.2mph).
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: 0.24"
The wettest month (with the highest rainfall) is March (2.2").
The driest month (with the least rainfall) is July (0.2").
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: 0"
The month with the highest snowfall is December (6.65").
The months with the least snowfall are May, June, July, August, September and October (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 (9.2 days).
The 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: 13h and 54min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in August: 11h and 24min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
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).
The 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: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
