Greeley weather in September: Greeley, Colorado: normal highs, lows, rain and records for September
Greeley in September has a normal high of 82°F and a normal low of 49°F, a daily mean of 65°F, falling from 87°F on the 1st to 76°F by the 30th. Measurable precipitation falls on 6 days in a normal September, 1.13 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 28°C and low of 9°C, 29 mm of precipitation and 1 cm of snow in September.
- NOAA stationGreeley Unc
- Station IDUSC00053553
- Location40.40°N 104.70°W
- Elevation4,715 ft (1,437 m)
- From the center4 miles
- Population114,363
- Jan 44° 18°
- Feb 48° 20°
- Mar 59° 28°
- Apr 66° 35°
- May 75° 45°
- Jun 86° 54°
- Jul 92° 59°
- Aug 89° 57°
- Sep 82° 49°
- Oct 68° 37°
- Nov 54° 26°
- Dec 43° 18°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Greeley in September?
The normal high is 82°F and the normal low 49°F, for a daily mean of 65.3°F. September is 8.0°F cooler than August and 13.1°F warmer than October. September is the 4th warmest month of the year in Greeley and the 6th wettest. Across the month the normal high falls 11°F, from 87°F on September 1 to 76°F on September 30. From one year to the next September's mean temperature typically moves about 2.7°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 63°F and 68°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 21%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 87°F | 54°F | 20% | 9% |
| September 8 | 85°F | 52°F | 20% | 10% |
| September 15 | 83°F | 49°F | 21% | 10% |
| September 22 | 80°F | 46°F | 20% | 10% |
| September 30 | 76°F | 43°F | 20% | 10% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 87°F | 54°F | 20% | 9% | 13 h 10 min |
| September 2 | 87°F | 53°F | 20% | 9% | 13 h 10 min |
| September 3 | 86°F | 53°F | 20% | 9% | 13 h |
| September 4 | 86°F | 53°F | 20% | 9% | 13 h |
| September 5 | 86°F | 53°F | 20% | 10% | 13 h |
| September 6 | 86°F | 52°F | 20% | 10% | 13 h |
| September 7 | 85°F | 52°F | 20% | 10% | 12 h 50 min |
| September 8 | 85°F | 52°F | 20% | 10% | 12 h 50 min |
| September 9 | 85°F | 51°F | 20% | 10% | 12 h 50 min |
| September 10 | 84°F | 51°F | 20% | 10% | 12 h 40 min |
| September 11 | 84°F | 51°F | 21% | 10% | 12 h 40 min |
| September 12 | 84°F | 50°F | 21% | 10% | 12 h 40 min |
| September 13 | 83°F | 50°F | 21% | 10% | 12 h 40 min |
| September 14 | 83°F | 50°F | 21% | 10% | 12 h 30 min |
| September 15 | 83°F | 49°F | 21% | 10% | 12 h 30 min |
| September 16 | 82°F | 49°F | 21% | 10% | 12 h 30 min |
| September 17 | 82°F | 48°F | 21% | 10% | 12 h 30 min |
| September 18 | 81°F | 48°F | 21% | 10% | 12 h 20 min |
| September 19 | 81°F | 48°F | 21% | 10% | 12 h 20 min |
| September 20 | 81°F | 47°F | 21% | 10% | 12 h 20 min |
| September 21 | 80°F | 47°F | 20% | 10% | 12 h 20 min |
| September 22 | 80°F | 46°F | 20% | 10% | 12 h 10 min |
| September 23 | 79°F | 46°F | 20% | 10% | 12 h 10 min |
| September 24 | 79°F | 46°F | 20% | 10% | 12 h 10 min |
| September 25 | 78°F | 45°F | 20% | 10% | 12 h 10 min |
| September 26 | 78°F | 45°F | 20% | 10% | 12 h |
| September 27 | 77°F | 44°F | 20% | 10% | 12 h |
| September 28 | 77°F | 44°F | 20% | 10% | 12 h |
| September 29 | 76°F | 44°F | 20% | 10% | 11 h 50 min |
| September 30 | 76°F | 43°F | 20% | 10% | 11 h 50 min |
- Normal high
- 82°FSeptember average
- Normal low
- 49°FSeptember average
- Precipitation
- 1.13 inmonth total
- Days with precipitation
- 60.01 inch or more
- Snowfall
- 0.5 inmonth total
- Days at 90°F or more
- 7
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 27
- Days at 80°F or more
- 20
- Sunshine
- 85%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00053553; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Greeley in September?
On a given September day the chance of 0.01 inch or more is 20% on average, highest around September 11 (21%). In all, 1.13 in falls on 6 days of a normal September.
In a normal September in Greeley, 7 days reach 90°F and snowfall averages 0.5 inches.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00053553.
What are the records for September in Greeley?
The warmest September temperature on this station's record (since 1967) is 105°F, on September 5, 2020; the coldest is 17°F, on September 30, 1985. The wettest September brought 4.89 in (2013); the snowiest, 9.0 inches (1971).
The September mean against the 1991-2020 normal of 65.3°F: 2021 70.5°F (+5.2), 2022 69.8°F (+4.5), 2023 68.5°F (+3.2), 2024 69.7°F (+4.4), 2025 66.9°F (+1.6), 2026 71.1°F (+5.8). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 70.5°F | +5.2°F | 0.43 in |
| 2022 | 69.8°F | +4.5°F | 0.94 in |
| 2023 | 68.5°F | +3.2°F | 0.28 in |
| 2024 | 69.7°F | +4.4°F | 1.31 in |
| 2025 | 66.9°F | +1.6°F | 2.65 in |
| 2026 | 71.1°F | +5.8°F | 1.03 in |
Source: records: ACIS, station USC00053553; recent months: ACIS, station USC00053553. Records and recent months use complete months only.
How does September in Greeley compare across Colorado?
Across the 125 places PlainClimate covers in Colorado, September normal highs run from 62°F in Leadville to 86°F in Lamar; Greeley's is 82°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.