Greeley, CO weather in September
Expect warm weather with some rain in Greeley in September, with highs near 82°F and lows near 49°F. Rain or snow falls on about 6 days. Snowfall averages about 0.5 in.
- Normal high
- 82°F
- Normal low
- 49°F
- Wet days
- 6
- 1.1 in total
- Snowfall
- 0.5 in
- normal snowfall
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 87°F | 76°F |
| Normal low | 54°F | 43°F |
| Chance of a wet day | 20% | 20% |
| Sunrise / sunset | 6:26 am / 7:31 pm | 6:54 am / 6:43 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 am53°Fdew point 40°F
- 9 am65°Fdew point 40°F
- Noon74°Fdew point 37°F
- 3 pm77°Fdew point 36°F
- 6 pm69°Fdew point 38°F
- 9 pm60°Fdew point 40°F
NOAA hourly normals (local standard time) from Denver Intl Airport (41 mi away); average wind 9 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°F9 of 30
- Hot dayshigh 90°F or more7 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 below0 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 1.1 in; a dry September brings about 0.5 in and a wet one about 1.6 in (25th and 75th percentiles). About 1 day brings half an inch or more. Normal snowfall is 0.5 in.
How September varies from year to year
- Warmest September, 1991-20202010: average high 90°F
- Coolest September1993: average high 74°F
- Wettest September2013: 4.9 in
- Driest September1992: no measurable precipitation
- Highest reading105°F (September 5, 2020)
- Lowest reading28°F (September 26, 2000)
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 | 89°F | 82°F | 68°F |
| Normal low | 57°F | 49°F | 37°F |
| Wet days | 7 | 6 | 6 |
| Comfortable days | 3 | 9 | 15 |
| Daylight | 13.7 h | 12.4 h | 11.1 h |
Highs change by -7°F from August and -14°F into October.
Nearby alternatives in September
- Cooler: Estes Park, CO43 mi · high 70°F · 9 wet days
How Greeley ranks in September
- Normal high179th warmest of 378 cities; 2nd of 17 in Colorado
- Wet days113th driest of 378
- Comfortable days171st most of 342
What to pack for Greeley in September
- Layers – afternoons near 82°F but nights near 49°F
Heating and cooling
September has 84 heating degree days and 93 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Greeley in September?
The normal high is 82°F and the normal low is 49°F. From 1991 to 2020 the hottest September reading was 105°F (September 5, 2020).
Does it rain a lot in Greeley in September?
About 6 days in September have at least 0.01 in of precipitation, and the normal total is 1.1 in. The wettest September in 1991-2020 was in 2013 (4.9 in); the driest was in 1992, with no measurable precipitation.
Does it snow in Greeley in September?
Yes. Normal snowfall in September is 0.5 in.
Is September a good time to visit Greeley?
September ranks 6th of 12 months on our comfort score for Greeley (58 out of 100). It has about 9 comfortable days and about 7 days at 90°F or hotter. The best months are April and May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Greeley Unc (USC00053553), 1.6 mi SSE of the city center, 4,715 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Denver Intl Airport (USW00003017), 41 mi S of the city center, 5,414 ft (740 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Cloud cover: Aurora Buckley Fld ANGB (USW00023036), 49 mi S of the city center, 5,663 ft (989 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Denver International Airport (725650-03017), 40 mi S of the city center, 5,404 ft (730 ft higher than the city). Hourly observations, 1991-2020.