EN
Grand Isle, LA weather in September
86°
Grand Isle, Sunday, 9 August, 13:17
Rain. Feels like 93°. High 86°, low 82°.
Pressure30.06 inHg
Wind9.6 mph SE 
Humidity66%
Visibility6.2 mi
Dew point73°
In September, Grand Isle, LA averages a high of 82.1° and a low of 78.7°. About 5.8 inches of precipitation fall over the month (14 wet days). The record high is 89.8° (2019) and the record low 61° (1967). Normals are computed over the last 60 years.
| Day | High | Low | Chance of precip. | Record high | Record low |
|---|---|---|---|---|---|
| 1 | 83.5° | 79.9° | 62% | 88.7° (2000) | 76.5° (1996) |
| 2 | 83.7° | 80.1° | 47% | 89.2° (1995) | 74.8° (1967) |
| 3 | 83.3° | 80.1° | 53% | 87.4° (1995) | 75.2° (1967) |
| 4 | 83.1° | 79.7° | 63% | 86.9° (2019) | 74.5° (1974) |
| 5 | 83.1° | 79.5° | 58% | 88.2° (2019) | 75.4° (1967) |
| 6 | 82.9° | 79° | 62% | 89.8° (2019) | 70.3° (2011) |
| 7 | 82.9° | 79.5° | 53% | 89.1° (2019) | 72.3° (2011) |
| 8 | 83.1° | 79.7° | 35% | 89.1° (2019) | 72.5° (2011) |
| 9 | 82.9° | 79.5° | 40% | 87.6° (2019) | 74.1° (2011) |
| 10 | 82.8° | 79.3° | 53% | 88.3° (1980) | 75.6° (2011) |
| 11 | 82.8° | 79.3° | 55% | 88.2° (2022) | 72.7° (2017) |
| 12 | 82.6° | 79.3° | 57% | 87.6° (2019) | 71.8° (2017) |
| 13 | 82.8° | 79.5° | 52% | 86.7° (2019) | 74.1° (2015) |
| 14 | 82.8° | 79.7° | 35% | 86.4° (1980) | 75.7° (1975) |
| 15 | 82.8° | 79.3° | 45% | 86° (2018) | 72.9° (1960) |
| 16 | 82.4° | 78.6° | 53% | 86.5° (2004) | 71.8° (1961) |
| 17 | 82.4° | 79.2° | 40% | 88.9° (2023) | 73.6° (1971) |
| 18 | 82.2° | 79.3° | 40% | 87.4° (2023) | 68.9° (1981) |
| 19 | 82° | 79° | 40% | 85.5° (2022) | 69.1° (1981) |
| 20 | 82° | 79° | 43% | 86.2° (2005) | 69.4° (1981) |
| 21 | 82° | 78.8° | 52% | 86.5° (2022) | 69.6° (1983) |
| 22 | 81.5° | 77.9° | 40% | 85.6° (1990) | 65.7° (1983) |
| 23 | 81.1° | 78.1° | 38% | 85.1° (2022) | 66.2° (1975) |
| 24 | 81.1° | 78.1° | 30% | 86.5° (2022) | 64.8° (1975) |
| 25 | 80.6° | 77.4° | 40% | 86.5° (2022) | 67.5° (1975) |
| 26 | 80.4° | 76.6° | 40% | 85.8° (2022) | 66.6° (2000) |
| 27 | 80.2° | 76.5° | 35% | 84.9° (2023) | 69.1° (1975) |
| 28 | 80.2° | 76.6° | 33% | 84.7° (2025) | 63.5° (1967) |
| 29 | 79.9° | 75.9° | 30% | 85.1° (2017) | 61° (1967) |
| 30 | 79.7° | 75.7° | 27% | 84.4° (2017) | 64.2° (1984) |
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