Last updated: June 24, 2025
In March, the average temperature in Grand Isle, United States hovers around -5°C (24°F). Temperatures can dip to a chilling -24°C (-12°F), while occasionally reaching a milder 16°C (60°F). Expect precipitation of about 77 mm (3.0 in) over approximately 10 days, accompanied by a notably high average humidity of 90%.
In March in Grand Isle, the average temperature is -5°C (24°F), with maximums reaching 16°C (60°F) and minimums dropping as low as -24°C (-12°F). Travelers should be prepared for a wide range of temperatures and dress in layers to stay comfortable.
In Grand Isle in March, the total precipitation amount is 77 mm (3.0 in) spread over a duration of 10 days.
In Grand Isle in March, humidity is 90%. With an average temperature of -5°C (24°F), this humidity feels like an icy mist wrapping around you, making every breath feel heavy and damp, while the cold sharpens the chill in the air, turning your travel experience into a battle against the harsh elements.
In Grand Isle in March, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Grand Isle.
UV Risk Categories
Weather in Grand Isle varies notably across the year, with each month offering distinct climate conditions. This page compares March’s weather to other months in Grand Isle, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -11°C (13°F) | 89 mm (3.5 inches) | 93% | low |
| February Weather | -9°C (15°F) | 74 mm (2.9 inches) | 92% | moderate |
| March Weather | -5°C (24°F) | 77 mm (3.0 inches) | 90% | moderate |
| April Weather | 3°C (37°F) | 119 mm (4.7 inches) | 87% | high |
| May Weather | 10°C (51°F) | 97 mm (3.8 inches) | 82% | very high |
| June Weather | 15°C (60°F) | 92 mm (3.6 inches) | 77% | very high |
| July Weather | 19°C (66°F) | 93 mm (3.7 inches) | 81% | very high |
| August Weather | 18°C (65°F) | 84 mm (3.3 inches) | 83% | very high |
| September Weather | 13°C (56°F) | 100 mm (3.9 inches) | 85% | high |
| October Weather | 7°C (45°F) | 121 mm (4.7 inches) | 87% | moderate |
| November Weather | -1°C (31°F) | 119 mm (4.7 inches) | 87% | moderate |
| December Weather | -8°C (18°F) | 102 mm (4.0 inches) | 90% | low |