Jōetsu Weather in September
Average highs run from 26°C on September 1 to 21°C on September 30, and lows from 20°C to 14°C. Normal precipitation for the month is 168 mm over about 18 wet days.
September day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
September at a glance
- Average high
- 24°C
- Average low
- 17°C
- Precipitation
- 168 mm
- Reanalysis high
- 32°CSep 1, 2002
- Reanalysis low
- 7°CSep 23, 2001
- Daylight
- 12 h 59 min to 11 h 52 min
- Cloud cover
- 73%
- Humidity
- 83%
- Dew point
- 17°C
- Wind
- 10.1 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 26°C | 20°C | 32°C 2002 | 16°C 2017 | 63% |
| Sep 2 | 26°C | 19°C | 30°C 1992 | 16°C 2017 | 63% |
| Sep 3 | 26°C | 19°C | 31°C 2020 | 15°C 1996 | 63% |
| Sep 4 | 26°C | 19°C | 30°C 2016 | 14°C 1996 | 63% |
| Sep 5 | 26°C | 19°C | 31°C 2010 | 14°C 1993 | 63% |
| Sep 6 | 25°C | 19°C | 29°C 2010 | 13°C 1993 | 63% |
| Sep 7 | 25°C | 19°C | 30°C 2019 | 15°C 2011 | 62% |
| Sep 8 | 25°C | 19°C | 30°C 2019 | 13°C 1996 | 61% |
| Sep 9 | 25°C | 18°C | 30°C 2006 | 14°C 2009 | 61% |
| Sep 10 | 25°C | 18°C | 30°C 1994 | 15°C 2009 | 61% |
| Sep 11 | 25°C | 18°C | 30°C 1994 | 14°C 1996 | 61% |
| Sep 12 | 24°C | 18°C | 28°C 2011 | 14°C 1995 | 60% |
| Sep 13 | 24°C | 18°C | 29°C 2003 | 14°C 1995 | 60% |
| Sep 14 | 24°C | 18°C | 29°C 2012 | 15°C 2017 | 58% |
| Sep 15 | 24°C | 17°C | 30°C 2007 | 14°C 1997 | 56% |
| Sep 16 | 23°C | 17°C | 30°C 2012 | 14°C 2013 | 56% |
| Sep 17 | 23°C | 17°C | 30°C 2012 | 12°C 2013 | 56% |
| Sep 18 | 23°C | 17°C | 29°C 2012 | 12°C 1995 | 56% |
| Sep 19 | 23°C | 17°C | 28°C 2007 | 13°C 2002 | 56% |
| Sep 20 | 23°C | 16°C | 28°C 2007 | 13°C 2009 | 55% |
| Sep 21 | 22°C | 16°C | 28°C 2007 | 12°C 2001 | 55% |
| Sep 22 | 22°C | 16°C | 26°C 1998 | 9°C 2001 | 54% |
| Sep 23 | 22°C | 16°C | 29°C 2019 | 7°C 2001 | 54% |
| Sep 24 | 22°C | 15°C | 28°C 1992 | 11°C 2011 | 55% |
| Sep 25 | 22°C | 15°C | 28°C 1992 | 11°C 2002 | 55% |
| Sep 26 | 21°C | 15°C | 26°C 2017 | 11°C 2002 | 54% |
| Sep 27 | 21°C | 15°C | 26°C 2016 | 10°C 1992 | 54% |
| Sep 28 | 21°C | 15°C | 28°C 1991 | 9°C 1992 | 55% |
| Sep 29 | 21°C | 14°C | 26°C 1994 | 9°C 2001 | 55% |
| Sep 30 | 21°C | 14°C | 26°C 1994 | 10°C 2003 | 55% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+9).
- September 1
- sunrise 5:17 AM, sunset 6:16 PM
- September 30
- sunrise 5:41 AM, sunset 5:33 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: 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.