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Weather in September in Idaho

Planning a journey to Idaho this September and curious over the weather conditions to await? Your essential details are found on this page, answering your query:

What is the weather like in Idaho in September?

Idaho is a region in the United States of America. September in Idaho generally has temperatures that range from pleasant to warm, with precipitation levels ranging from low to moderate.

Temperatures

The average highest temperatures fluctuate between pleasant in Wallace at 20°C to warm in Hagerman at 28°C. Nighttime temperatures generally drop to 8°C in Hagerman and 7°C in Wallace.

Precipitation

In September, precipitation varies across different areas. From low rainfall in Hagerman with an average of 8.6 mm to moderate rainfall in Victor with 47 mm.

Average sunshine

The days are mostly sunny, with an average total of around 303 hours of sunshine in Boise. The sunlight during this month doesn't just make the days brighter, it also seems to make everyone a bit more cheerful.

To learn more about the conditions in specific areas of Idaho in September, check out the map below. For more details on the yearly weather, visit our Idaho climate page.

Where to go in Idaho in September

Find more information for the most popular destinations in the Idaho on the map below. Click on a destination dot for more detailes.

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

Popular destinations

What is the weather like in September for the 5 most popular destinations in Idaho?

Boise

In September Boise generally has high temperatures with maximum daytime temperatures around 27°C, minimum nighttime temperatures around 10°C and low monthly rainfall. So on average the conditions are perfect that month.

Boise
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
32°C 
14°C 
358 hours 
8.3 mm 
4 days 
27°C 
10°C 
303 hours 
13 mm 
5 days 
October   >> October
>>  
19°C 
4°C 
238 hours 
28 mm 
8 days 
Climate in Boise

Coeur d'Alene

In September Coeur d'Alene generally has high temperatures with maximum daytime temperatures around 23°C, minimum nighttime temperatures around 8°C and low monthly rainfall. So on average the conditions are perfect that month.

Coeur d'Alene
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
29°C 
12°C 
340 hours 
20 mm 
5 days 
23°C 
8°C 
272 hours 
23 mm 
7 days 
October   >> October
>>  
15°C 
3°C 
192 hours 
45 mm 
12 days 
Climate in Coeur d'Alene

Idaho Falls

In September Idaho Falls generally has high temperatures with maximum daytime temperatures around 24°C, minimum nighttime temperatures around 6°C and low monthly rainfall. So on average the conditions are perfect that month.

Idaho Falls
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
30°C 
10°C 
16 mm 
5 days 
24°C 
6°C 
26 mm 
5 days 
October   >> October
>>  
16°C 
1°C 
32 mm 
7 days 
Climate in Idaho Falls

Ketchum

In September Ketchum generally has pleasant temperatures with maximum daytime temperatures around 21°C, minimum nighttime temperatures around 4°C and moderate monthly rainfall. So on average the conditions are perfect that month.

Ketchum
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
26°C 
8°C 
19 mm 
6 days 
21°C 
4°C 
31 mm 
6 days 
October   >> October
>>  
13°C 
-1°C 
46 mm 
10 days 
Climate in Ketchum

Pocatello

In September Pocatello generally has high temperatures with maximum daytime temperatures around 25°C, minimum nighttime temperatures around 8°C and moderate monthly rainfall. So on average the conditions are perfect that month.

Pocatello
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
31°C 
13°C 
27 mm 
6 days 
25°C 
8°C 
31 mm 
6 days 
October   >> October
>>  
17°C 
3°C 
32 mm 
7 days 
Climate in Pocatello

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

Is September the best time to visit Idaho?

We consider September to be one of the best times to travel to Idaho. Typically, the climate in Boise is perfect.

On average, the best time to visit Idaho is in May, June, August, September and October with generally perfect weather in Boise. On the other hand, the weather in January, November and December tend to be poor.

Interested in more climate information?

We have much more information about the climate in Idaho. Interested in the weather conditions in a specific month? Select the month below.

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  • 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.