Centennial, CO weather in September
Expect mild weather with some rain in Centennial in September, with highs near 77°F and lows near 49°F. Rain or snow falls on about 6 days. Snowfall averages about 0.6 in. Good for outdoor plans.
- Normal high
- 77°F
- Normal low
- 49°F
- Wet days
- 6
- 1.3 in total
- Snowfall
- 0.6 in
- normal snowfall
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 82°F | 71°F |
| Normal low | 54°F | 43°F |
| Chance of a wet day | 24% | 20% |
| Sunrise / sunset | 6:27 am / 7:31 pm | 6:54 am / 6:44 pm |
| Daylight | 13.1 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Mountain Time).
A typical September day
- 6 am52°Fdew point 39°F
- 9 am65°Fdew point 39°F
- Noon73°Fdew point 37°F
- 3 pm74°Fdew point 36°F
- 6 pm68°Fdew point 39°F
- 9 pm60°Fdew point 40°F
NOAA hourly normals (local standard time) from Denver Centennial Airport (2 mi away); average wind 8 mph; clear or few clouds in 46% of daytime hours, mostly cloudy or overcast in 35%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F12 of 30
- Hot dayshigh 90°F or more2 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow6 of 30
- Notable rainat least 0.10 in3 of 30
- Freezing nightslow 32°F or below1 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain and snow in September
Normal precipitation is 1.3 in; a dry September brings about 0.6 in and a wet one about 1.5 in (25th and 75th percentiles). About 1 day brings half an inch or more. Normal snowfall is 0.6 in.
How September varies from year to year
- Warmest September, 1991-20202019: average high 86°F
- Coolest September2006: average high 71°F
- Wettest September2013: 7.0 in
- Driest September2010: 0.05 in
- Highest reading98°F (September 2, 2019)
- Lowest reading26°F (September 29, 1999)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 85°F | 77°F | 64°F |
| Normal low | 57°F | 49°F | 36°F |
| Wet days | 10 | 6 | 6 |
| Comfortable days | 6 | 12 | 15 |
| Daylight | 13.7 h | 12.4 h | 11.2 h |
Highs change by -8°F from August and -13°F into October.
Nearby alternatives in September
- Warmer: Pueblo, CO93 mi · high 83°F · 5 wet days
- Cooler: Breckenridge, CO62 mi · high 62°F · 10 wet days
How Centennial ranks in September
- Normal high240th warmest of 378 cities; 8th of 17 in Colorado
- Wet days109th driest of 378
- Comfortable days136th most of 342
What to pack for Centennial in September
- Layers – afternoons near 77°F but nights near 49°F
Heating and cooling
September has 127 heating degree days and 62 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Centennial in September?
The normal high is 77°F and the normal low is 49°F. From 1991 to 2020 the hottest September reading was 98°F (September 2, 2019).
Does it rain a lot in Centennial in September?
About 6 days in September have at least 0.01 in of precipitation, and the normal total is 1.3 in. The wettest September in 1991-2020 was in 2013 (7.0 in); the driest was in 2010 (0.05 in).
Does it snow in Centennial in September?
Yes. Normal snowfall in September is 0.6 in.
Is September a good time to visit Centennial?
September ranks 5th of 12 months on our comfort score for Centennial (65 out of 100). It has about 12 comfortable days and about 2 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, frost dates and humidity and wind by hour: Denver Centennial Airport (USW00093067), 1.6 mi ESE of the city center, 5,883 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Kassler (USC00054452), 13 mi WSW of the city center, 5,587 ft (254 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Cloud cover: Aurora Buckley Fld ANGB (USW00023036), 12 mi NE of the city center, 5,663 ft (178 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Buckley Air Force Base (724695-23036), 12 mi NE of the city center, 5,663 ft (178 ft lower than the city). Hourly observations, 1991-2020.