Fountain Hills Weather in September
Average highs run from 101°F on September 1 to 93°F on September 30, and lows from 78°F to 69°F. Normal precipitation for the month is 0.81 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
- 97°F
- Average low
- 74°F
- Precipitation
- 0.81 in
- Record high
- 115°FSep 3, 2010
- Record low
- 50°FSep 25, 2017
- Chance of a freeze
- 0%
- Days of 90°F or more
- 27.9
- Daylight
- 12 h 51 min to 11 h 51 min
- Cloud cover
- 29%
- Humidity
- 37%
- Dew point
- 48°F
- Wind
- 6.9 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 | 101°F | 78°F | 113°F 2002 | 71°F 2021 | 12% |
| Sep 2 | 101°F | 77°F | 111°F 2007 | 72°F 2006 | 12% |
| Sep 3 | 100°F | 77°F | 115°F 2010 | 70°F 2006 | 12% |
| Sep 4 | 100°F | 77°F | 114°F 2020 | 70°F 2015 | 12% |
| Sep 5 | 100°F | 77°F | 115°F 2020 | 69°F 2009 | 12% |
| Sep 6 | 100°F | 77°F | 112°F 2020 | 63°F 2004 | 11% |
| Sep 7 | 100°F | 76°F | 109°F 2005 | 68°F 2004 | 11% |
| Sep 8 | 99°F | 76°F | 109°F 2011 | 67°F 2006 | 11% |
| Sep 9 | 99°F | 76°F | 112°F 2023 | 64°F 2010 | 11% |
| Sep 10 | 99°F | 76°F | 110°F 2004 | 64°F 2010 | 10% |
| Sep 11 | 99°F | 75°F | 110°F 2007 | 59°F 2010 | 10% |
| Sep 12 | 98°F | 75°F | 108°F 2017 | 63°F 2020 | 10% |
| Sep 13 | 98°F | 75°F | 107°F 2007 | 63°F 2010 | 10% |
| Sep 14 | 98°F | 75°F | 107°F 2007 | 63°F 2005 | 10% |
| Sep 15 | 98°F | 74°F | 109°F 2018 | 60°F 2005 | 9% |
| Sep 16 | 97°F | 74°F | 108°F 2013 | 61°F 2012 | 9% |
| Sep 17 | 97°F | 74°F | 108°F 2020 | 61°F 2005 | 9% |
| Sep 18 | 97°F | 73°F | 111°F 2010 | 60°F 2006 | 9% |
| Sep 19 | 96°F | 73°F | 112°F 2010 | 59°F 2006 | 9% |
| Sep 20 | 96°F | 73°F | 109°F 2010 | 63°F 2002 | 8% |
| Sep 21 | 96°F | 72°F | 106°F 2003 | 54°F 2004 | 8% |
| Sep 22 | 95°F | 72°F | 106°F 2003 | 54°F 2004 | 8% |
| Sep 23 | 95°F | 71°F | 107°F 2002 | 55°F 2004 | 8% |
| Sep 24 | 95°F | 71°F | 109°F 2008 | 53°F 2016 | 8% |
| Sep 25 | 94°F | 71°F | 112°F 2024 | 50°F 2017 | 8% |
| Sep 26 | 94°F | 70°F | 109°F 2024 | 54°F 2017 | 8% |
| Sep 27 | 94°F | 70°F | 111°F 2024 | 59°F 2007 | 7% |
| Sep 28 | 93°F | 70°F | 115°F 2024 | 54°F 2013 | 7% |
| Sep 29 | 93°F | 69°F | 112°F 2024 | 58°F 2013 | 7% |
| Sep 30 | 93°F | 69°F | 108°F 2024 | 57°F 2002 | 7% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (MST).
- September 1
- sunrise 6:01 AM, sunset 6:52 PM
- September 30
- sunrise 6:21 AM, sunset 6:12 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00023190 (Fountain Hills), public domain. Records: NOAA GHCN-Daily, station USC00022782, 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.