Temperatures in September
It's pleasantly warm in September in Idaho with an average temperature of 22°C. Temperatures this month range from a low of 16°C to a high of 28°C. At night, you can expect temperatures between -1°C and 4°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Idaho in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Idaho with hot temperatures, averaging around 27°C during the day and nights close to 3°C. There’s little chance of precipitation. The weather is mostly sunny and dry.
Mid-September
By mid-September, the average daytime temperature drops to around 21°C, with nights close to 2°C. There might be a few showers during this period, but plenty of dry days with sunshine too.
End of September
By the end of September, the average daytime temperature in Idaho will be around 19°C, with nights close to 0°C. Barely any chance of precipitation. The weather will mostly be dry with lots of sunshine.
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Precipitation in September
In September, there is an average of 47 mm of precipitation, spread over 5 days. Of the total precipitation, about 5,6 cm falls as snow in September. The wind speed is around 3 Bft, mostly coming from the Southwest.
The precipitation chance averages 18% per day this month. Though that seems low, there are also a few days with a higher chance of precipitation.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Idaho. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Idaho in September |
UK | ||
|---|---|---|---|
 Average Temperature |
22°C | 20°C | |
 High Temp |
28°C | 22°C | |
| Low Temp |
16°C | 17°C | |
 Total Precipitation |
47 mm | 44 mm | |
| Rainy Days |
5 days | 8 days | |
 Total Snowfall |
5,6 cm | 0 cm | |
| Snowy Days |
2 days | 0 days | |
August
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Temperature records for Idaho in September
With 35°C, Idaho hit the highest temperature in the last 10 years in September 2019. The lowest daytime temperature in this month was 3°C in 2019. The extreme night temperatures ranged from a low of -9°C to a high of 13°C.
Check out the climate of Idaho for all months and discover the best travel time
The climate of Idaho is based on weather data from . Other spots, like New York City, Miami or Los Angeles, might have different weather. You can check out all destinations in Idaho for a full picture of the climate.
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Daily Temperature in September in Idaho
This chart shows the average daily temperatures, both day and night, for each day in September in Idaho, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Idaho
The chart below shows the average daily precipitation in September for Idaho, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 5 days of rain in Idaho.
Daily Snowfall in September in Idaho
This chart shows the average daily snowfall in September in Idaho, measured in centimetres. The bottom of the chart shows the days of the month. The data is based on historical measurements and gives an idea of the average snowfall in September.
Daily UV Index in September in Idaho
This chart shows the average daily UV index in September in Idaho, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Idaho Over the Years
This chart shows the average temperature in September in Idaho, measured in degrees Celsius, over the past years.
Total Precipitation in September in Idaho Over the Years
This chart shows the average precipitation in September in Idaho, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Snowfall in September in Idaho per year
This chart shows the average snowfall in September in Idaho, measured in centimetres, over the past years.
Daily climate in September for Idaho
Click on a specific day in September for detailed info on the typical weather on that day in Idaho. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Idaho
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Average Weather in Idaho by Month
Click on a month below to see detailed weather info for Idaho. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
