Malheur County Weather in September
Average highs run from 87°F on September 1 to 76°F on September 30, and lows from 43°F to 34°F. Normal precipitation for the month is 0.42 in over about 3 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
- 38°F
- Precipitation
- 0.42 in
- Record high
- 106°FSep 5, 2020
- Record low
- 19°FSep 27, 1999
- Chance of a freeze
- 96%
- Days of 90°F or more
- 7.4
- Daylight
- 13 h 10 min to 11 h 46 min
- Cloud cover
- 36%
- Humidity
- 38%
- Dew point
- 33°F
- Wind
- 7.2 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 87°F | 43°F | 101°F 1950 | 29°F 1999 | 8% |
| Sep 2 | 87°F | 42°F | 105°F 1950 | 31°F 1999 | 8% |
| Sep 3 | 87°F | 42°F | 105°F 2017 | 32°F 1999 | 8% |
| Sep 4 | 87°F | 42°F | 104°F 2017 | 35°F 1999 | 8% |
| Sep 5 | 86°F | 41°F | 106°F 2020 | 34°F 2014 | 8% |
| Sep 6 | 86°F | 41°F | 106°F 2022 | 33°F 2015 | 8% |
| Sep 7 | 86°F | 41°F | 105°F 2022 | 30°F 2010 | 8% |
| Sep 8 | 85°F | 41°F | 100°F 2021 | 32°F 2001 | 9% |
| Sep 9 | 85°F | 40°F | 99°F 2021 | 32°F 2001 | 9% |
| Sep 10 | 85°F | 40°F | 96°F 2015 | 30°F 2007 | 9% |
| Sep 11 | 84°F | 40°F | 98°F 2015 | 32°F 2005 | 9% |
| Sep 12 | 84°F | 39°F | 98°F 2015 | 31°F 2005 | 9% |
| Sep 13 | 83°F | 39°F | 97°F 2020 | 31°F 2012 | 10% |
| Sep 14 | 83°F | 39°F | 97°F 2000 | 30°F 2003 | 10% |
| Sep 15 | 83°F | 38°F | 92°F 2013 | 30°F 2006 | 10% |
| Sep 16 | 82°F | 38°F | 92°F 2014 | 32°F 2006 | 11% |
| Sep 17 | 82°F | 38°F | 94°F 2014 | 26°F 2006 | 11% |
| Sep 18 | 82°F | 38°F | 88°F 2009 | 29°F 2003 | 11% |
| Sep 19 | 81°F | 37°F | 89°F 2016 | 31°F 2013 | 11% |
| Sep 20 | 81°F | 37°F | 90°F 2015 | 32°F 2021 | 12% |
| Sep 21 | 80°F | 37°F | 88°F 1999 | 31°F 2009 | 12% |
| Sep 22 | 80°F | 36°F | 92°F 2011 | 28°F 2006 | 12% |
| Sep 23 | 79°F | 36°F | 93°F 2011 | 24°F 2000 | 12% |
| Sep 24 | 79°F | 36°F | 94°F 2011 | 21°F 2000 | 13% |
| Sep 25 | 78°F | 35°F | 93°F 2015 | 26°F 2005 | 13% |
| Sep 26 | 78°F | 35°F | 91°F 2022 | 26°F 1999 | 13% |
| Sep 27 | 78°F | 35°F | 93°F 2022 | 19°F 1999 | 14% |
| Sep 28 | 77°F | 34°F | 93°F 2010 | 20°F 1999 | 14% |
| Sep 29 | 77°F | 34°F | 89°F 2011 | 24°F 1999 | 14% |
| Sep 30 | 76°F | 34°F | 93°F 2010 | 25°F 1950 | 15% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (MDT).
- September 1
- sunrise 7:15 AM, sunset 8:25 PM
- September 30
- sunrise 7:47 AM, sunset 7:33 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00357310 (Rome 2 Nw), public domain. Records: NOAA GHCN-Daily, station USW00094107, 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.