Grand Isle, Louisiana Weather
Cicadas claim the scorching afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Grand Isle weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast14%—87°78°—
- MondayJul 6Overcast54%—85°80°-2°
- TuesdayJul 7Heavy Drizzle56%—90°80°+5°
- WednesdayJul 8Overcast14%—92°80°+2°
- ThursdayJul 9Overcast——92°79°0°
- FridayJul 10Overcast——91°79°-1°
- SaturdayJul 11Thunderstorm14%—86°79°-5°
AQI 42 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 9.0 µg/m³, PM10 at 12.1 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 40. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 40
- UV peak
- 3.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 9
PM × Wind × Precip
PM2.5 at 9.0 µg/m³, PM10 at 12.1 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.74
- Wind
- breezy
- Recent rain
- 0h in last 6h
- Pattern
- background
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:11 PM
- Moonset
- 11:15 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Grand Isle at a glance
- Today vs. normal: 84°F — typical for the season
- Last frost: February 10 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 70358
15-Day Forecast — Grand Isle
- Sun86°81°14%
- Mon85°80°54%
- Tue90°80°56%
- Wed92°80°14%
- Thu92°79°5%
- Fri91°79°7%
- Sat86°79°14%
- Sun81°74°36%
- Mon82°76°37%
- Tue89°76°38%
- Wed90°77°27%
- Thu90°80°42%
- Fri89°80°29%
- Sat88°79°42%
- Sun91°81°26%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Grand Isle
SPC includes Grand Isle in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Grand Isle
- 70358