Denver Weather in September
Typical September in Denver: days around 80°F, nights around 50°F — based on 30-year climate normals (NOAA, 1991–2020), day by day below.
80°Faverage high
50°Faverage low
85°Fwarmest normal day
73°Fcoolest normal day
Day-by-day September normals for Denver
Long-term daily averages (NOAA 1991–2020) — climate, not a live forecast. For the next 16 days, use the live forecast.
| Day | Avg high | Avg low |
|---|---|---|
| Sep 1 | 85°F | 55°F |
| Sep 2 | 84°F | 55°F |
| Sep 3 | 84°F | 54°F |
| Sep 4 | 84°F | 54°F |
| Sep 5 | 84°F | 54°F |
| Sep 6 | 83°F | 54°F |
| Sep 7 | 83°F | 53°F |
| Sep 8 | 83°F | 53°F |
| Sep 9 | 82°F | 53°F |
| Sep 10 | 82°F | 52°F |
| Sep 11 | 82°F | 52°F |
| Sep 12 | 81°F | 52°F |
| Sep 13 | 81°F | 51°F |
| Sep 14 | 81°F | 51°F |
| Sep 15 | 80°F | 50°F |
| Sep 16 | 80°F | 50°F |
| Sep 17 | 79°F | 50°F |
| Sep 18 | 79°F | 49°F |
| Sep 19 | 78°F | 49°F |
| Sep 20 | 78°F | 48°F |
| Sep 21 | 78°F | 48°F |
| Sep 22 | 77°F | 48°F |
| Sep 23 | 77°F | 47°F |
| Sep 24 | 76°F | 47°F |
| Sep 25 | 76°F | 46°F |
| Sep 26 | 75°F | 46°F |
| Sep 27 | 74°F | 45°F |
| Sep 28 | 74°F | 45°F |
| Sep 29 | 74°F | 44°F |
| Sep 30 | 73°F | 44°F |
September in Denver through the years
Real photos taken in Denver in September by Weathershot app users — different years, same month.
More months: October · Live Denver forecast
Climate normals: NOAA 1991–2020 (GHCND). Photos: Weathershot community, taken on location. © Weathershot · Byss Mobile