United States · 1991–2020 normal
Grand Isle in
September.
Typical September weather in Grand Isle: 30.3°C by day, 22.1°C at night, 168 mm of rain over 9.4 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high30.3°C
Typical low22.1°C
Rain168 mm
Wet days9.4
Comfort score 42 this month (April leads the year at 84). Daylight is calculated as 12 h 18 from latitude 29.24°. Open-water sea temperature is 28.7°C (17 km from the place centre).
Event window
Warm sea in September
The nearest open-water NOAA OISST 1991–2020 cell averages 28.7°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 4326198
- NOAA station
- USC00163433 · GALLIANO
- Station distance
- 39.9 km from the place centre
- Coverage
- Strong coverage · 29 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.