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United StatesThe weather in September in Denver
It's warm in September in Denver with an average temperature of 27°C. Temperatures this month range from a low of 23°C to a high of 31°C. At night, you can expect temperatures between 9°C and 16°C.
Looking for great weather? September is a good time to be in Denver. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Denver, Colorado. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 37°C in 2020, Denver reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 4°C in 2020. The extreme nighttime temperatures ranged from a lowest recorded value of -1°C to a highest value of 21°C.
Rainfall amount
In September, there is an average of 23 mm of precipitation, spread over 5 days. The wind speed is around 4 Bft, mostly coming from the South.
Daily weather in September for Denver
Click on any day in September to get detailed info about the usual weather on that day in Denver. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Denver | New York | |
|---|---|---|
| Average temperature | 27°C | 27°C |
| Max. temperature | 31°C | 31°C |
| Min. temperature | 9°C | -5°C |
| Total precipitation | 23 mm | 57 mm |
| Rainy days | 5 days | 9 days |
Start of September
The month of September starts in Denver with hot temps, averaging around 29°C during the day and nights around 14°C.
Mid September
By mid-September, daytime temps stay steady at around 29°C, with nights around 13°C. Not much precipitation expected during this period. It’s mostly dry and sunny.
End of September
By the end of September, the average daytime temperature in Denver is around 26°C, while nighttime temps are about 11°C. There’s hardly any chance of precipitation. The weather will be mostly dry with plenty of sun.
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UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Check out the climate of Denver for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Denver, Colorado. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Denver
Temperature in September in Denver over the years
Precipitation charts
These charts show the average amount of precipitation in September in Denver, Colorado. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Denver
Total precipitation in September in Denver over the years
Daily UV index in September in Denver
This chart shows the average daily UV index in September in Denver, 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.
Weather experiences in September in Denver
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Average weather in Denver by month
Click on a month below to see detailed weather info for Denver. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.