Boise (Idaho) in september: average Weather, Temperature and Climate
Weather in Boise (Idaho) in september 2025
The weather in Boise (Idaho) in the month of september comes from statistical datas on the past years. You can view the weather statistics for all the month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
perfect weather UV index: 6
Weather at 6am
58°F
Clear/Sunny
75% of time
14%
9%
3%
Weather at 12pm
72°F
Clear/Sunny
76% of time
14%
8%
3%
Weather at 6pm
76°F
Clear/Sunny
77% of time
11%
7%
4%
Weather at 3am
59°F
75%
15%
8%
2%
Evolution of daily average temperature and precipitation in Boise (Idaho) in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Boise (Idaho) in september.
The climate of Boise (Idaho) in september is perfect
the weather in Boise (Idaho) in september is quite dry (with 1.1in of precipitation over 1 days). The weather is worst than the previous month since in august there is an average of 0.6in of rainfall over 1 days.
The climate good here september. The thermometer averaged maximum of 77°F. In the morning the temperature drops to 58°F. Thus, the mean temperature average on this month of september in Boise (Idaho) is 67°F. These temperatures are far removed from those records observed in Boise (Idaho) in the month of september with a maximum record of 97°F in 2021 and a minimum record of 36°F in 2019. You You can hope to have about 4 days with temperatures above 86°F, or 13 of time.
On average, in Boise (Idaho), the days of september last 12:30. The sun rises at 06:24 and sunset is at 18:54.
With a perfect climate, this month is advisable to go in this city.
Seasonal average climate and temperature of Boise (Idaho) in september
Check below seasonal norms These datas are set from the weather statements of the last years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 67°F | ||||
| Highest temperature | 77°F | ||||
| Lowest temperature | 58°F | ||||
| Highest record temperature | 97°F (2021) | ||||
| Lowest record temperature | 36°F (2019) | ||||
| Number of days at +86°F | 4 day(s) (13%) | ||||
| Number of days at +65°F | 27 day(s) (90%) | ||||
| Number of days at -32°F | 0 day(s) (0%) | ||||
| Wind | |||||
| Wind speed | 14km/h | ||||
| Wind temperature | 56°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 1.1in | ||||
| Number of days with rainfall | 1 day(s) (4%) | ||||
| Record daily rainfall | 1in (2013) | ||||
| Snowfall | 0cm | ||||
| Other climate data | |||||
| Humidity | 51% | ||||
| Visibility | 9.85km | ||||
| Cloud cover | 13% | ||||
| UV index | 6 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:24 | ||||
| Time of sunset | 18:54 | ||||
| Length of day | 12:30 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | perfect | ||||
How was the weather last september?
Here is the day by day recorded weather in Boise (Idaho) in september 2024:
67°F to 99°F
76°F to 90°F
63°F to 83°F
61°F to 90°F
67°F to 94°F
68°F to 95°F
68°F to 97°F
74°F to 95°F
65°F to 94°F
68°F to 90°F
63°F to 74°F
56°F to 67°F
50°F to 76°F
63°F to 83°F
63°F to 81°F
58°F to 70°F
56°F to 65°F
50°F to 65°F
54°F to 79°F
52°F to 79°F
45°F to 74°F
47°F to 76°F
52°F to 77°F
54°F to 85°F
56°F to 92°F
58°F to 83°F
52°F to 86°F
54°F to 92°F
56°F to 79°F
40°F to 70°F
Map: other cities in the United States (USA) in september
Cities near Boise (Idaho):
| Black Rock Desert in september | perfect weather |
| Grand Teton National Park (Wyoming) in september | very bad weather |
| Jackson Hole in september | very bad weather |
| Yellowstone National Park in september | very bad weather |
| Helena (Montana) in september | tolerable weather |
| Salt Lake City in september | good weather |
| Crater Lake (Oregon) in september | tolerable weather |
| Reno in september | perfect weather |
| Portland in september | good weather |
| Salem (Oregon) in september | perfect weather |
| Mount Rainier National Park (Washington) in september | tolerable weather |
| Cody (Wyoming) in september | tolerable weather |
Click over cities on the map for information about the weather in september.
Boise (Idaho)
perfect weather
good
tolerable
bad
very bad
Weather data for Boise (Idaho) in september:
Weather data for Boise (Idaho) for september are derived from an average of the weather forecast since 2009 in Boise (Idaho). There is a margin of error and these forecasts are to be considered as general information only. The weather in Boise (Idaho) can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Boise (Idaho).