Japan · 1991–2020 normal
Koshima in
September.
Typical September weather in Koshima: 29°C by day, 22.8°C at night, 471 mm of rain over 15.5 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high29°C
Typical low22.8°C
Rain471 mm
Wet days15.5
Comfort score 5 this month (April leads the year at 37). Daylight is calculated as 12 h 19 from latitude 30.23°. Open-water sea temperature is 28.0°C (15 km from the place centre).
Event window
Warm sea in September
The nearest open-water NOAA OISST 1991–2020 cell averages 28.0°C in September. A sheltered bay can run warmer than that open-water cell.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 1858711
- NOAA station
- JA000047836 · YAKUSHIMA
- Station distance
- 20.8 km from the place centre
- Coverage
- Good coverage · 18 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.