September
Other strong months: May and June
76/100 weather score
United States · 1991–2020
Best time to visit
Denver
For Denver, September has the most comfortable weather in our climate comparison. Typical daytime highs are 27.9°C, nights average 10°C, and rainfall totals about 30 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthSeptember
Typical daytime high27.9°C
Typical night-time low10°C
September rainfall30 mm
October
Other strong months: May and April
86/100 weather score
Make the answer personal
Choose the weather
that suits you.
Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.
4 months fit your choices for Denver
December has the lowest comfort score at 9 out of 100, compared with September at 76. The main reason is that days reach only 8.4°C, 16° below the 24°C the score treats as ideal, and nights drop to -7.1°C.
Quick answers
Planning a trip to Denver?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Denver?
September is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 27.9°C and 30 mm of rain.
What is the hottest month in Denver?
July is hottest in this record, with a typical daytime high of 33.5°C and a night-time low of 16.4°C.
Which month has the least rain?
January and December have the lowest monthly rainfall total at 11 mm.
Is this a weather forecast?
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
See how the weather
changes through the year.
The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 9.3°C | -6.7°C | 11 mm | 2.7 | 9 h 38 | 12 | Good coverage |
| February | 9.3°C | -6.4°C | 13 mm | 3.2 | 10 h 38 | 13 | Good coverage |
| March | 14.6°C | -1.6°C | 28 mm | 4.1 | 11 h 49 | 38 | Good coverage |
| April | 18.1°C | 1.8°C | 49 mm | 6.1 | 13 h 12 | 52 | Good coverage |
| May | 22.8°C | 7°C | 66 mm | 7.7 | 14 h 20 | 73 | Good coverage |
| June | 30.1°C | 12.6°C | 39 mm | 5.2 | 14 h 58 | 73 | Good coverage |
| July | 33.5°C | 16.4°C | 50 mm | 5.8 | 14 h 43 | 61 | Good coverage |
| August | 32.3°C | 14.9°C | 48 mm | 5.6 | 13 h 44 | 69 | Good coverage |
| September | 27.9°C | 10°C | 30 mm | 5 | 12 h 24 | 76 | Good coverage |
| October | 19.8°C | 2.5°C | 28 mm | 3.9 | 11 h 05 | 63 | Good coverage |
| November | 13.9°C | -2.8°C | 14 mm | 2.8 | 9 h 56 | 35 | Good coverage |
| December | 8.4°C | -7.1°C | 11 mm | 2.7 | 9 h 22 | 9 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 25.0°C28 Jan 2015 | -26.1°C6 Jan 2017 | 13 mm12 Jan 2019 | 31 mm2019 · driest 2 mm in 2011 | 29 |
| February | 25.6°C17 Feb 2017 | -25.6°C3 Feb 2011 | 27 mm4 Feb 2024 | 64 mm2015 · driest 0 mm in 2026 | 29 |
| March | 32.2°C22 Mar 2026 | -18.9°C3 Mar 2002 | 40 mm14 Mar 2024 | 82 mm2003 · driest 0 mm in 2012 | 27 |
| April | 32.8°C25 Apr 2012 | -13.3°C10 Apr 2013 | 51 mm25 Apr 2007 | 148 mm1999 · driest 1 mm in 2022 | 29 |
| May | 37.2°C30 May 2000 | -6.7°C2 May 2013 | 74 mm12 May 2023 | 162 mm2015 · driest 20 mm in 2005 | 29 |
| June | 41.7°C26 Jun 2012 | 2.2°C8 Jun 2007 | 46 mm22 Jun 2023 | 170 mm2015 · driest 3 mm in 2010 | 29 |
| July | 42.2°C21 Jul 2005 | 9.4°C1 Jul 2017 | 48 mm28 Jul 2007 | 123 mm2011 · driest 4 mm in 2008 | 29 |
| August | 40.0°C1 Aug 2002 | 4.4°C20 Aug 2016 | 89 mm19 Aug 2004 | 141 mm2004 · driest 7 mm in 2011 | 28 |
| September | 38.9°C7 Sep 2020 | -5.6°C24 Sep 2000 | 29 mm24 Sep 2025 | 103 mm2013 · driest 2 mm in 2016 | 28 |
| October | 32.2°C3 Oct 2024 | -15.6°C27 Oct 2020 | 35 mm10 Oct 2005 | 67 mm2005 · driest 1 mm in 2024 | 28 |
| November | 29.4°C3 Nov 2025 | -22.2°C13 Nov 2014 | 24 mm5 Nov 2015 | 55 mm2015 · driest 0 mm in 2006 | 29 |
| December | 25.6°C23 Dec 2025 | -25.0°C31 Dec 2014 | 33 mm29 Dec 2022 | 37 mm2007 · driest 0 mm in 2002 | 29 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | <1 | 4 |
| February | <1 | 0 | 26 | <1 | 4 |
| March | 2 | 0 | 20 | <1 | 4 |
| April | 6 | <1 | 10 | 2 | 3 |
| May | 14 | 5 | 2 | 3 | <1 |
| June | 26 | 16 | 0 | 1 | 0 |
| July | 30 | 26 | 0 | 2 | 0 |
| August | 29 | 24 | 0 | 1 | 0 |
| September | 21 | 13 | <1 | 1 | 0 |
| October | 9 | 2 | 9 | <1 | 1 |
| November | 2 | 0 | 21 | <1 | 3 |
| December | 0 | 0 | 28 | <1 | 4 |
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | 4% | 9% | <1% | 3% | 5.5–11.2°C |
| February | 8% | 12% | <1% | 5% | 6.8–13.6°C |
| March | 28% | 13% | 4% | 7% | 12.0–17.9°C |
| April | 44% | 19% | 5% | 18% | 15.8–20.5°C |
| May | 61% | 25% | 8% | 25% | 20.4–25.2°C |
| June | 81% | 18% | 4% | 17% | 27.1–32.2°C |
| July | 82% | 18% | 5% | 16% | 31.4–35.5°C |
| August | 83% | 18% | 4% | 11% | 30.4–33.9°C |
| September | 81% | 15% | 4% | 11% | 26.2–30.6°C |
| October | 56% | 12% | 3% | 6% | 17.2–23.3°C |
| November | 25% | 9% | 1% | 4% | 10.4–17.2°C |
| December | 5% | 8% | <1% | 3% | 6.5–11.9°C |
A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.
The evidence behind this page
Where these figures
come from.
- Place identity
- GeoNames 5419384
- NOAA station
- USC00052223 · DENVER WATER DEPT
- Station distance
- 2.3 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 21 usable years
- Daylight
- Calculated from latitude 39.74°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for Denver is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
How travel partnerships will work