Black Rock Weather in September
Average highs run from 86°F on September 1 to 77°F on September 30, and lows from 50°F to 40°F. Normal precipitation for the month is 0.79 in over about 4 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
- 82°F
- Average low
- 45°F
- Precipitation
- 0.79 in
- Record high
- 96°FSep 4, 2020
- Record low
- 20°FSep 18, 2006
- Chance of a freeze
- 37%
- Days of 90°F or more
- 2.9
- Daylight
- 12 h 54 min to 11 h 51 min
- Cloud cover
- 38%
- Humidity
- 46%
- Dew point
- 39°F
- Wind
- 8.1 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 | 86°F | 50°F | 94°F 1950 | 36°F 2010 | 18% | 0% |
| Sep 2 | 86°F | 50°F | 94°F 2019 | 31°F 2010 | 18% | 0% |
| Sep 3 | 86°F | 50°F | 94°F 2019 | 37°F 2011 | 17% | 0% |
| Sep 4 | 86°F | 49°F | 96°F 2020 | 33°F 1961 | 17% | 0% |
| Sep 5 | 85°F | 49°F | 95°F 2020 | 34°F 2008 | 17% | 0% |
| Sep 6 | 85°F | 49°F | 95°F 2020 | 36°F 2008 | 16% | 0% |
| Sep 7 | 85°F | 48°F | 95°F 2020 | 36°F 2008 | 16% | 0% |
| Sep 8 | 85°F | 48°F | 93°F 2021 | 38°F 2001 | 16% | 0% |
| Sep 9 | 84°F | 48°F | 92°F 2021 | 34°F 2001 | 16% | 0% |
| Sep 10 | 84°F | 48°F | 92°F 2021 | 29°F 2010 | 15% | 0% |
| Sep 11 | 84°F | 47°F | 92°F 2004 | 27°F 2010 | 15% | 0% |
| Sep 12 | 84°F | 47°F | 92°F 1990 | 32°F 2010 | 15% | 0% |
| Sep 13 | 83°F | 47°F | 92°F 1990 | 31°F 1952 | 14% | 0% |
| Sep 14 | 83°F | 46°F | 96°F 2000 | 30°F 2008 | 14% | 0% |
| Sep 15 | 83°F | 46°F | 91°F 2000 | 29°F 2011 | 14% | 0% |
| Sep 16 | 83°F | 45°F | 91°F 2010 | 27°F 2011 | 14% | 0% |
| Sep 17 | 82°F | 45°F | 92°F 2000 | 28°F 2006 | 13% | 0% |
| Sep 18 | 82°F | 45°F | 91°F 1956 | 20°F 2006 | 13% | 0% |
| Sep 19 | 82°F | 44°F | 92°F 2010 | 23°F 2011 | 13% | 0% |
| Sep 20 | 81°F | 44°F | 90°F 1980 | 28°F 2011 | 13% | 0% |
| Sep 21 | 81°F | 43°F | 89°F 1954 | 24°F 2006 | 12% | 0% |
| Sep 22 | 80°F | 43°F | 89°F 2003 | 22°F 2011 | 12% | 0% |
| Sep 23 | 80°F | 43°F | 88°F 1966 | 24°F 2009 | 12% | 0% |
| Sep 24 | 80°F | 42°F | 89°F 1998 | 22°F 2011 | 12% | 0% |
| Sep 25 | 79°F | 42°F | 88°F 2001 | 22°F 2011 | 12% | 0% |
| Sep 26 | 79°F | 41°F | 89°F 2001 | 23°F 2011 | 11% | 0% |
| Sep 27 | 79°F | 41°F | 92°F 2010 | 23°F 2011 | 11% | 0% |
| Sep 28 | 78°F | 41°F | 92°F 2010 | 25°F 2011 | 11% | 0% |
| Sep 29 | 78°F | 40°F | 91°F 2010 | 22°F 2011 | 11% | 0% |
| Sep 30 | 77°F | 40°F | 92°F 2010 | 22°F 2011 | 11% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- September 1
- sunrise 6:48 AM, sunset 7:42 PM
- September 30
- sunrise 7:09 AM, sunset 7:00 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00093044 (Zuni), public domain. Records: NOAA GHCN-Daily, station USW00093044, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.