Idaho Springs Weather in September
Average highs run from 72°F on September 1 to 64°F on September 30, and lows from 43°F to 35°F. Normal precipitation for the month is 1.52 in over about 10 wet days.
September day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 68°F
- Average low
- 39°F
- Precipitation
- 1.52 in
- Snowfall
- 1.6 in
- Record high
- 78°FSep 5, 2020
- Record low
- 17°FSep 8, 2020
- Chance of a freeze
- 90%
- Daylight
- 13 h 03 min to 11 h 49 min
- Cloud cover
- 50%
- Humidity
- 54%
- Dew point
- 30°F
- Wind
- 5.6 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Sep 1 | 72°F | 43°F | 75°F 2019 | 29°F 2005 | 39% | 1% |
| Sep 2 | 72°F | 43°F | 77°F 2019 | 28°F 2006 | 38% | 1% |
| Sep 3 | 72°F | 43°F | 74°F 2017 | 27°F 2006 | 38% | 1% |
| Sep 4 | 72°F | 42°F | 74°F 2019 | 26°F 2006 | 38% | 1% |
| Sep 5 | 71°F | 42°F | 78°F 2020 | 27°F 2006 | 37% | 1% |
| Sep 6 | 71°F | 42°F | 76°F 2022 | 27°F 2010 | 37% | 1% |
| Sep 7 | 71°F | 42°F | 74°F 2022 | 26°F 2010 | 37% | 1% |
| Sep 8 | 71°F | 41°F | 75°F 2022 | 17°F 2020 | 36% | 1% |
| Sep 9 | 70°F | 41°F | 74°F 2021 | 17°F 2020 | 36% | 1% |
| Sep 10 | 70°F | 41°F | 75°F 2021 | 22°F 2020 | 36% | 1% |
| Sep 11 | 70°F | 41°F | 72°F 2021 | 24°F 2014 | 35% | 1% |
| Sep 12 | 70°F | 40°F | 72°F 2018 | 19°F 2014 | 35% | 2% |
| Sep 13 | 69°F | 40°F | 73°F 2018 | 27°F 2019 | 34% | 2% |
| Sep 14 | 69°F | 40°F | 71°F 2018 | 28°F 2005 | 34% | 2% |
| Sep 15 | 69°F | 40°F | 72°F 2018 | 29°F 2016 | 34% | 2% |
| Sep 16 | 69°F | 39°F | 72°F 2018 | 24°F 2006 | 33% | 2% |
| Sep 17 | 68°F | 39°F | 72°F 2018 | 23°F 2006 | 33% | 2% |
| Sep 18 | 68°F | 39°F | 73°F 2018 | 28°F 2006 | 32% | 3% |
| Sep 19 | 68°F | 38°F | 73°F 2010 | 27°F 2015 | 32% | 3% |
| Sep 20 | 67°F | 38°F | 69°F 2022 | 28°F 2013 | 31% | 3% |
| Sep 21 | 67°F | 38°F | 69°F 2015 | 23°F 2009 | 31% | 3% |
| Sep 22 | 67°F | 38°F | 65°F 2018 | 19°F 2004 | 31% | 3% |
| Sep 23 | 66°F | 37°F | 66°F 2015 | 25°F 2006 | 30% | 4% |
| Sep 24 | 66°F | 37°F | 68°F 2020 | 26°F 2009 | 30% | 4% |
| Sep 25 | 65°F | 37°F | 69°F 2020 | 24°F 2006 | 30% | 4% |
| Sep 26 | 65°F | 36°F | 71°F 2014 | 24°F 2017 | 29% | 4% |
| Sep 27 | 65°F | 36°F | 70°F 2015 | 24°F 2013 | 29% | 5% |
| Sep 28 | 64°F | 36°F | 72°F 2010 | 20°F 2020 | 29% | 5% |
| Sep 29 | 64°F | 35°F | 70°F 2024 | 28°F 2003 | 29% | 5% |
| Sep 30 | 64°F | 35°F | 67°F 2018 | 21°F 2009 | 28% | 6% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- September 1
- sunrise 6:30 AM, sunset 7:33 PM
- September 30
- sunrise 6:57 AM, sunset 6:46 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00053261 (Georgetown), public domain. Records: NOAA GHCN-Daily, station USW00094075, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.