Boise

Idaho Weather in August

Average temperatures, rainfall, sunshine and the best places to visit in Idaho, the United States of America in August.

Considering a trip to Idaho, the United States of America this August and wondering about the expected weather conditions? Find all the crucial information you need right here, addressing your question:

What to Expect in Idaho in August

Idaho, the United States of America is a region in the United States of America. August in Idaho generally has temperatures that range from warm to very warm, with precipitation levels ranging from almost none to moderate. August falls during the summer season.

Temperatures

Based on our climate data spanning from 1990-2020, the average maximum temperature is warm in Wallace at 25°C (77°F) to very warm in Lewiston at 33°C (91°F). Nighttime temperatures generally drop to 16°C (61°F) in Lewiston and 10°C (50°F) in Wallace. The temperatures cited for both day and night represent usual averages, but it's possible some days could be hotter. It's advisable to dress accordingly to handle the heat.

To explore the conditions in Idaho, the United States of America in more detail, check the map below.

Precipitation

In August, precipitation varies across different areas. From almost no rainfall in Mountain Home with an average of 3.7 mm (0.1 in) to moderate rainfall in Victor with 37 mm (1.5 in). Based on our climate data it is the driest month of the year in Boise.

Average sunshine

Sunshine is generally plentiful throughout many areas. Boise enjoys about 358 hours of sunlight, ideal for those seeking sunny weather.

Explore Idaho by month

Pick a month to see the average temperature, rainfall and sunshine in Idaho - and find the best time to visit. (based on Boise)

Best Places to Visit in Idaho in August

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Idaho.

perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Idaho

What is the weather like in August for some of the most popular destinations in Idaho, the United States of America?

Temperature range in Idaho (August)

Precipitation variation in Idaho (August)

Boise

In August Boise generally has very high temperatures with maximum daytime temperatures around 32°C (90°F), minimum nighttime temperatures around 14°C (57°F) and low monthly rainfall. So on average the conditions are excellent that month.

July
August
September
Max temperature
34°C (93°F)
32°C (90°F)
27°C (81°F)
Min temperature
15°C (59°F)
14°C (57°F)
10°C (50°F)
Monthly sun hours
399 hours
358 hours
303 hours
Monthly rainfall
8.4 mm (0.3 in)
8.3 mm (0.3 in)
13 mm (0.5 in)
Monthly rainy days
4 days
4 days
5 days
Weather conditions

Coeur d'Alene

In August Coeur d'Alene generally has high temperatures with maximum daytime temperatures around 29°C (84°F), minimum nighttime temperatures around 12°C (54°F) and low monthly rainfall. So on average the conditions are excellent that month.

July
August
September
Max temperature
29°C (84°F)
29°C (84°F)
23°C (73°F)
Min temperature
13°C (55°F)
12°C (54°F)
8°C (46°F)
Monthly sun hours
383 hours
340 hours
272 hours
Monthly rainfall
19 mm (0.7 in)
20 mm (0.8 in)
23 mm (0.9 in)
Monthly rainy days
5 days
5 days
7 days
Weather conditions

Idaho Falls

In August Idaho Falls generally has high temperatures with maximum daytime temperatures around 30°C (86°F), minimum nighttime temperatures around 10°C (50°F) and low monthly rainfall. So on average the conditions are excellent that month.

July
August
September
Max temperature
31°C (88°F)
30°C (86°F)
24°C (75°F)
Min temperature
11°C (52°F)
10°C (50°F)
6°C (43°F)
Monthly rainfall
8.5 mm (0.3 in)
16 mm (0.6 in)
26 mm (1 in)
Monthly rainy days
4 days
5 days
5 days
Weather conditions

Ketchum

In August Ketchum generally has high temperatures with maximum daytime temperatures around 26°C (79°F), minimum nighttime temperatures around 8°C (46°F) and low monthly rainfall. So on average the conditions are excellent that month.

July
August
September
Max temperature
27°C (81°F)
26°C (79°F)
21°C (70°F)
Min temperature
9°C (48°F)
8°C (46°F)
4°C (39°F)
Monthly rainfall
11 mm (0.4 in)
19 mm (0.7 in)
31 mm (1.2 in)
Monthly rainy days
5 days
6 days
6 days
Weather conditions

Pocatello

In August Pocatello generally has very high temperatures with maximum daytime temperatures around 31°C (88°F), minimum nighttime temperatures around 13°C (55°F) and low monthly rainfall. So on average the conditions are excellent that month.

July
August
September
Max temperature
32°C (90°F)
31°C (88°F)
25°C (77°F)
Min temperature
14°C (57°F)
13°C (55°F)
8°C (46°F)
Monthly rainfall
16 mm (0.6 in)
27 mm (1.1 in)
31 mm (1.2 in)
Monthly rainy days
6 days
6 days
6 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Idaho, in the United States of America.

Popular cities in August

Day & night temperatures, rainfall and average weather in Idaho in August.

City Weather Day temp Night temp Rainfall
Boise 32°C (90°F) 14°C (57°F) 8.3 mm (0.3 in)
Coeur d'Alene 29°C (84°F) 12°C (54°F) 20 mm (0.8 in)
Idaho Falls 30°C (86°F) 10°C (50°F) 16 mm (0.6 in)
Ketchum 26°C (79°F) 8°C (46°F) 19 mm (0.7 in)
Pocatello 31°C (88°F) 13°C (55°F) 27 mm (1.1 in)
Island Park 26°C (79°F) 5°C (41°F) 27 mm (1.1 in)

Idaho weather in August: frequently asked questions

What is the weather like in Idaho, the United States of America in August?

In August, Idaho, the United States of America generally has very good weather conditions. Boise sees daytime temperatures near 32°C (90°F), with nights cooling to roughly 14°C (57°F).

What is the average temperature in Idaho, the United States of America in August?

Average temperatures in Idaho, the United States of America during August range from a nighttime low near 14°C (57°F) to a daytime high around 32°C (90°F) in Boise.

Does Idaho, the United States of America get a lot of rain in August?

Not particularly. Boise averages just 8.3 mm (0.3 in) of rain in August, making it a mostly dry month for Idaho, the United States of America.

Is August a Good Time to Visit Idaho, the United States of America?

Given the typically excellent weather conditions in Boise, August might be a good time to visit Idaho, the United States of America.

Generally speaking, May, June, September and October provide excellent weather in Boise. On the other hand, the weather in January, July, November and December tend to be less favorable.

Interested in more climate information?

We have much more information about the climate in Idaho.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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