Temperatures in September
It's cool in September in Rocky Mountains with an average temperature of 11°C. Temperatures this month range from a low of 8°C to a high of 15°C. At night, you can expect temperatures between -3°C and 4°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Rocky Mountains 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 Rocky Mountains with cool temperatures, averaging around 14°C during the day and nights close to 3°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Mid-September
By mid-September, the average daytime temperature drops to around 11°C, with nights close to 1°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
End of September
By the end of September, the average daytime temperature in Rocky Mountains will be around 10°C, with nights close to 0°C. A shower might show up, but overall the weather will be dry and sunny.
Precipitation in September
In September, there is an average of 120 mm of precipitation, spread over 16 days. Of the total precipitation, about 11 cm falls as snow in September. The wind speed is around 3 Bft, mostly coming from the Southwest.
Across the whole month, the average precipitation chance is 54% per day.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Rocky Mountains. 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.
Rocky Mountains in September |
London | ||
|---|---|---|---|
 Average Temperature |
11°C | 20°C | |
 High Temp |
15°C | 22°C | |
| Low Temp |
8°C | 17°C | |
 Total Precipitation |
120 mm | 44 mm | |
| Rainy Days |
16 days | 8 days | |
 Total Snowfall |
11 cm | 0 cm | |
| Snowy Days |
5 days | 0 days | |
August
UV index
The UV index is a maximum of 6 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Is September a good time to visit Rocky Mountains?
After some sun? Then September isn’t the best time to be in Rocky Mountains. There’s too much chance of rain this month.
Temperature records for Rocky Mountains in September
With 25°C, Rocky Mountains hit the highest temperature in the last 10 years in September 2017. The lowest daytime temperature in this month was -3°C in 2019. The extreme night temperatures ranged from a low of -19°C to a high of 11°C.
Check out the climate of Rocky Mountains for all months and discover the best travel time
Curious about the climate in other parts of Canada? Check out the weather and climate in places like Vancouver, Toronto, Niagara Falls, or have a look at other destinations in Canada.
Daily Temperature in September in Rocky Mountains
This chart shows the average daily temperatures, both day and night, for each day in September in Rocky Mountains, 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 Rocky Mountains
The chart below shows the average daily precipitation in September for Rocky Mountains, 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 16 days of rain in Rocky Mountains.
Daily Snowfall in September in Rocky Mountains
This chart shows the average daily snowfall in September in Rocky Mountains, 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 Rocky Mountains
This chart shows the average daily UV index in September in Rocky Mountains, 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 Rocky Mountains Over the Years
This chart shows the average temperature in September in Rocky Mountains, measured in degrees Celsius, over the past years.
Total Precipitation in September in Rocky Mountains Over the Years
This chart shows the average precipitation in September in Rocky Mountains, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Snowfall in September in Rocky Mountains per year
This chart shows the average snowfall in September in Rocky Mountains, measured in centimetres, over the past years.
Daily climate in September for Rocky Mountains
Click on a specific day in September for detailed info on the typical weather on that day in Rocky Mountains. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Rocky Mountains
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Average Weather in Rocky Mountains by Month
Click on a month below to see detailed weather info for Rocky Mountains. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Rocky Mountains for all months at once
