Grand Coteau, LA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Coteau, a town in St. Landry County, Louisiana.
This Afternoon
94°F
Sunny
Sunny, with a high near 94. Heat index values as high as 97. East wind around 5 mph.
7-day forecast for Grand Coteau
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 94°F | Sunny | 5 mph E | 0% |
| Tonight | 70°F | Clear | 0 to 5 mph SE | 0% |
| Saturday | 96°F | Sunny | 0 to 5 mph E | 1% |
| Saturday Night | 73°F | Clear | 0 to 5 mph S | 1% |
| Sunday | 96°F | Sunny | 0 to 5 mph E | 5% |
| Sunday Night | 74°F | Mostly Clear | 0 to 5 mph SW | 5% |
| Monday | 97°F | Mostly Sunny | 0 to 5 mph N | 13% |
| Monday Night | 74°F | Partly Cloudy | 0 mph | 13% |
| Tuesday | 98°F | Sunny | 0 to 5 mph N | 11% |
| Tuesday Night | 74°F | Mostly Clear | 0 to 5 mph NE | 11% |
| Wednesday | 97°F | Sunny | 0 to 10 mph NE | 5% |
| Wednesday Night | 73°F | Mostly Clear | 5 mph NE | 5% |
| Thursday | 94°F | Sunny | 5 to 10 mph NE | 3% |
| Thursday Night | 71°F | Mostly Clear | 5 to 10 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Grand Coteau (30.420, -92.044). Updated through the day.
Growing snapshot for Grand Coteau
Last spring frost
Feb 28
First fall frost
Nov 23
Growing season
267 days
Hardiness zone
9a
More local growing data for Grand Coteau: nearby ZIP 70541 weather · frost dates · planting calendar · Louisiana frost dates
Nearby towns & communities
Arnaudville
Cankton
Krotz Springs
Lawtell
Lebeau
Leonville
Melville
Morrow
Opelousas
Palmetto
Port Barre
Sunset
Washington
Climate data from the nearest NOAA station, Grand Coteau, La (0.2 mi from Grand Coteau). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.