Iwaki Weather in September
Average highs run from 25°C on September 1 to 22°C on September 30, and lows from 23°C to 19°C. Normal precipitation for the month is 180 mm over about 15 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
- 23°C
- Average low
- 22°C
- Precipitation
- 180 mm
- Reanalysis high
- 29°CSep 3, 1992
- Reanalysis low
- 16°CSep 22, 2001
- Daylight
- 12 h 59 min to 11 h 51 min
- Cloud cover
- 73%
- Humidity
- 84%
- Dew point
- 20°C
- Wind
- 17.3 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 | 25°C | 23°C | 28°C 1999 | 20°C 2017 | 56% |
| Sep 2 | 25°C | 23°C | 28°C 2000 | 20°C 1993 | 57% |
| Sep 3 | 25°C | 23°C | 29°C 1992 | 20°C 2017 | 57% |
| Sep 4 | 25°C | 23°C | 27°C 2010 | 20°C 2001 | 58% |
| Sep 5 | 25°C | 23°C | 27°C 2016 | 21°C 2003 | 58% |
| Sep 6 | 25°C | 23°C | 27°C 2010 | 20°C 1992 | 57% |
| Sep 7 | 24°C | 23°C | 28°C 2010 | 20°C 2017 | 57% |
| Sep 8 | 24°C | 23°C | 28°C 2005 | 20°C 1996 | 56% |
| Sep 9 | 24°C | 23°C | 27°C 2019 | 20°C 2009 | 56% |
| Sep 10 | 24°C | 22°C | 28°C 2019 | 20°C 2009 | 56% |
| Sep 11 | 24°C | 22°C | 27°C 1999 | 20°C 2009 | 57% |
| Sep 12 | 24°C | 22°C | 28°C 1999 | 20°C 2009 | 55% |
| Sep 13 | 24°C | 22°C | 27°C 2010 | 20°C 2009 | 55% |
| Sep 14 | 24°C | 22°C | 27°C 1999 | 19°C 2009 | 54% |
| Sep 15 | 24°C | 22°C | 27°C 1999 | 19°C 2004 | 53% |
| Sep 16 | 23°C | 22°C | 28°C 1998 | 18°C 2004 | 53% |
| Sep 17 | 23°C | 21°C | 27°C 2012 | 18°C 1995 | 52% |
| Sep 18 | 23°C | 21°C | 28°C 2020 | 18°C 1995 | 52% |
| Sep 19 | 23°C | 21°C | 26°C 2012 | 19°C 1995 | 52% |
| Sep 20 | 23°C | 21°C | 27°C 1999 | 17°C 2003 | 51% |
| Sep 21 | 23°C | 21°C | 26°C 2010 | 16°C 2003 | 50% |
| Sep 22 | 23°C | 21°C | 26°C 2010 | 16°C 2001 | 49% |
| Sep 23 | 22°C | 20°C | 25°C 2019 | 17°C 2003 | 50% |
| Sep 24 | 22°C | 20°C | 26°C 1999 | 17°C 2002 | 50% |
| Sep 25 | 22°C | 20°C | 28°C 1999 | 16°C 2010 | 50% |
| Sep 26 | 22°C | 20°C | 25°C 1999 | 18°C 2008 | 48% |
| Sep 27 | 22°C | 20°C | 24°C 2016 | 16°C 1992 | 48% |
| Sep 28 | 22°C | 20°C | 25°C 2007 | 16°C 1992 | 49% |
| Sep 29 | 22°C | 20°C | 25°C 1999 | 16°C 1992 | 50% |
| Sep 30 | 22°C | 19°C | 25°C 1999 | 16°C 2003 | 48% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+9).
- September 1
- sunrise 5:07 AM, sunset 6:06 PM
- September 30
- sunrise 5:31 AM, sunset 5:22 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.