Niihama Weather in May
Average highs run from 20°C on May 1 to 23°C on May 31, and lows from 11°C to 15°C. Normal precipitation for the month is 177 mm over about 12 wet days.
May day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
May at a glance
- Average high
- 21°C
- Average low
- 13°C
- Precipitation
- 177 mm
- Reanalysis high
- 29°CMay 30, 2017
- Reanalysis low
- 4°CMay 5, 1991
- Daylight
- 13 h 32 min to 14 h 15 min
- Cloud cover
- 69%
- Humidity
- 78%
- Dew point
- 13°C
- Wind
- 12.6 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 |
|---|---|---|---|---|---|
| May 1 | 20°C | 11°C | 24°C 2006 | 6°C 2013 | 38% |
| May 2 | 20°C | 11°C | 27°C 1994 | 4°C 2013 | 36% |
| May 3 | 20°C | 11°C | 23°C 2003 | 5°C 1991 | 37% |
| May 4 | 20°C | 11°C | 25°C 1994 | 5°C 1991 | 37% |
| May 5 | 20°C | 11°C | 25°C 1997 | 4°C 1991 | 38% |
| May 6 | 21°C | 12°C | 26°C 1997 | 7°C 2014 | 38% |
| May 7 | 21°C | 12°C | 26°C 2003 | 7°C 2019 | 38% |
| May 8 | 21°C | 12°C | 24°C 1997 | 5°C 2013 | 38% |
| May 9 | 21°C | 12°C | 26°C 2009 | 5°C 2003 | 38% |
| May 10 | 21°C | 12°C | 26°C 2009 | 6°C 2003 | 38% |
| May 11 | 21°C | 12°C | 26°C 2009 | 6°C 1992 | 38% |
| May 12 | 21°C | 12°C | 26°C 2009 | 6°C 1995 | 39% |
| May 13 | 21°C | 12°C | 27°C 1993 | 7°C 2012 | 40% |
| May 14 | 21°C | 13°C | 26°C 2013 | 8°C 2010 | 38% |
| May 15 | 21°C | 13°C | 26°C 2018 | 7°C 1993 | 37% |
| May 16 | 21°C | 13°C | 26°C 1997 | 7°C 1993 | 36% |
| May 17 | 22°C | 13°C | 27°C 2018 | 9°C 2003 | 36% |
| May 18 | 22°C | 13°C | 25°C 2018 | 9°C 1995 | 35% |
| May 19 | 22°C | 13°C | 26°C 1999 | 9°C 1994 | 35% |
| May 20 | 22°C | 13°C | 27°C 2009 | 8°C 1994 | 35% |
| May 21 | 22°C | 13°C | 26°C 2010 | 9°C 2020 | 36% |
| May 22 | 22°C | 14°C | 26°C 2013 | 9°C 1997 | 37% |
| May 23 | 22°C | 14°C | 26°C 2016 | 10°C 1995 | 37% |
| May 24 | 22°C | 14°C | 26°C 2019 | 10°C 1992 | 38% |
| May 25 | 22°C | 14°C | 28°C 2019 | 9°C 1992 | 37% |
| May 26 | 22°C | 14°C | 27°C 2019 | 10°C 1992 | 37% |
| May 27 | 23°C | 14°C | 27°C 2015 | 10°C 2010 | 37% |
| May 28 | 23°C | 14°C | 26°C 2014 | 8°C 2010 | 36% |
| May 29 | 23°C | 15°C | 27°C 2014 | 10°C 2010 | 37% |
| May 30 | 23°C | 15°C | 29°C 2017 | 10°C 2010 | 36% |
| May 31 | 23°C | 15°C | 28°C 2014 | 12°C 1998 | 38% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+9).
- May 1
- sunrise 5:18 AM, sunset 6:50 PM
- May 31
- sunrise 4:57 AM, sunset 7:12 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.