Last updated: June 24, 2025
In Grand Bay, United States, the average temperature in September is a warm 26°C (80°F), with a minimum of 15°C (60°F) and a maximum reaching up to 36°C (96°F). Expect 170 mm (6.7 in) of precipitation over approximately 14 days, contributing to a high average humidity of 80%. Make sure to stay hydrated and prepared for those warm, humid days!
In September in Grand Bay, the average temperature is 26°C (80°F), with maximums reaching 36°C (96°F) and minimums dropping as low as 15°C (60°F). This makes it an ideal time for travelers seeking warm weather while enjoying pleasant evenings.
In Grand Bay in September, the total precipitation amount is 170 mm (6.7 in) accumulated over the course of 14 days.
In Grand Bay in September humidity is 80%. With an average temperature of 26°C (80°F), this humidity feels like a warm, enveloping blanket, making it quite uncomfortable for traveling. The thick, heavy air can leave you feeling sticky and fatigued, making outdoor activities more challenging and necessitating frequent breaks for hydration and cooling down.
In Grand Bay in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Grand Bay.
UV Risk Categories
Weather in Grand Bay varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Grand Bay, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 12°C (54°F) | 95 mm (3.7 inches) | 82% | moderate |
| February Weather | 15°C (59°F) | 109 mm (4.3 inches) | 80% | very high |
| March Weather | 18°C (64°F) | 86 mm (3.4 inches) | 80% | very high |
| April Weather | 20°C (68°F) | 120 mm (4.7 inches) | 78% | extreme |
| May Weather | 24°C (76°F) | 131 mm (5.2 inches) | 73% | extreme |
| June Weather | 27°C (81°F) | 244 mm (9.6 inches) | 71% | extreme |
| July Weather | 28°C (82°F) | 163 mm (6.4 inches) | 79% | extreme |
| August Weather | 28°C (82°F) | 208 mm (8.2 inches) | 78% | extreme |
| September Weather | 26°C (80°F) | 170 mm (6.7 inches) | 80% | very high |
| October Weather | 23°C (73°F) | 134 mm (5.3 inches) | 76% | very high |
| November Weather | 16°C (61°F) | 56 mm (2.2 inches) | 83% | high |
| December Weather | 14°C (57°F) | 121 mm (4.8 inches) | 87% | moderate |