Highlands Ranch, CO weather in September
In September, Highlands Ranch sees highs around 76°F and lows around 43°F: mild, with some rain. There are about 7 days with rain or snow. Snowfall averages about 0.6 in. Good for outdoor plans.
- Normal high
- 76°F
- Normal low
- 43°F
- Wet days
- 7
- 1.7 in total
- Snowfall
- 0.6 in
- normal snowfall
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 80°F | 70°F |
| Normal low | 49°F | 37°F |
| Chance of a wet day | 25% | 21% |
| Sunrise / sunset | 6:28 am / 7:31 pm | 6:55 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 (7 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°F14 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow7 of 30
- Notable rainat least 0.10 in4 of 30
- Freezing nightslow 32°F or below4 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 1.7 in; a dry September brings about 0.7 in and a wet one about 2.6 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 82°F
- Coolest September2006: average high 70°F
- Wettest September2013: 4.6 in
- Driest September2010: no measurable precipitation
- Highest reading96°F (September 6, 2020)
- Lowest reading12°F (September 30, 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 | 83°F | 76°F | 64°F |
| Normal low | 52°F | 43°F | 31°F |
| Wet days | 10 | 7 | 6 |
| Comfortable days | 8 | 14 | 15 |
| Daylight | 13.7 h | 12.4 h | 11.2 h |
Highs change by -7°F from August and -12°F into October.
Nearby alternatives in September
- Warmer: Greeley, CO62 mi · high 82°F · 6 wet days
- Cooler: Breckenridge, CO57 mi · high 62°F · 10 wet days
How Highlands Ranch ranks in September
- Normal high263rd warmest of 378 cities; 11th of 17 in Colorado
- Wet days131st driest of 378
- Comfortable days109th most of 342
What to pack for Highlands Ranch in September
- Layers – afternoons near 76°F but nights near 43°F
Heating and cooling
September has 191 heating degree days and 25 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Highlands Ranch in September?
The normal high is 76°F and the normal low is 43°F. From 1991 to 2020 the hottest September reading was 96°F (September 6, 2020).
Does it rain a lot in Highlands Ranch in September?
About 7 days in September have at least 0.01 in of precipitation, and the normal total is 1.7 in. The wettest September in 1991-2020 was in 2013 (4.6 in); the driest was in 2010, with no measurable precipitation.
Does it snow in Highlands Ranch in September?
Yes. Normal snowfall in September is 0.6 in.
Is September a good time to visit Highlands Ranch?
September ranks 3rd of 12 months on our comfort score for Highlands Ranch (68 out of 100). It has about 14 comfortable days and about 1 day at 90°F or hotter. The best months are May and June.
Where the numbers come from
- Temperature: Strontia Springs Dam (USC00058022), 12 mi SW of the city center, 5,840 ft (145 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Rain, snowfall and snow depth: Kassler (USC00054452), 8.0 mi WSW of the city center, 5,587 ft (108 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Frost dates and humidity and wind by hour: Denver Centennial Airport (USW00093067), 6.5 mi E of the city center, 5,883 ft (188 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Cloud cover: Aurora Buckley Fld ANGB (USW00023036), 16 mi NE of the city center, 5,663 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Buckley Air Force Base (724695-23036), 16 mi NE of the city center, 5,663 ft . Hourly observations, 1991-2020.