Weather and climate in Grand Bay, AL
What the weather is like in Grand Bay
The warmest month in Grand Bay is July, with average highs of 88°F. The coolest is January, when nights average 46°F. About 62.6 in of rain and snow falls in a typical year, most in August and least in November.
Skies are clearest in October (40% average cloud cover) and cloudiest in December (61%). Combining cloud with the length of truly dark nights, October, November, September offer the most clear, dark hours for stargazing.
Clear, dark hours per night
Hours of full astronomical darkness in mid-month, multiplied by the average share of clear sky. A rough guide to how much good observing time a typical night offers.
Monthly averages
| Month | High | Low | Precipitation | Cloud cover | Humidity | Wind | Dark hours |
|---|---|---|---|---|---|---|---|
| January | 59°F | 46°F | 4.0 in | 58% | 82% | 7 mph | 10.8 h |
| February | 62°F | 49°F | 4.5 in | 60% | 83% | 7 mph | 10.2 h |
| March | 68°F | 55°F | 4.8 in | 53% | 82% | 6 mph | 9.3 h |
| April | 74°F | 62°F | 5.0 in | 47% | 80% | 6 mph | 8.3 h |
| May | 81°F | 70°F | 4.6 in | 44% | 77% | 6 mph | 7.2 h |
| June | 86°F | 77°F | 6.8 in | 50% | 76% | 5 mph | 6.7 h |
| July | 88°F | 78°F | 7.1 in | 58% | 77% | 5 mph | 6.9 h |
| August | 88°F | 78°F | 7.3 in | 56% | 78% | 5 mph | 7.9 h |
| September | 85°F | 74°F | 5.6 in | 44% | 77% | 6 mph | 9.0 h |
| October | 78°F | 65°F | 4.0 in | 40% | 76% | 6 mph | 9.9 h |
| November | 69°F | 55°F | 3.3 in | 46% | 78% | 7 mph | 10.6 h |
| December | 62°F | 50°F | 5.5 in | 61% | 83% | 7 mph | 11.0 h |
Climate averages: NASA POWER, 2001–2025, for the grid area around 30.50, -88.13 (about 50 km across). High and low temperatures are estimated from the monthly mean and the average daily range. Hills, coasts and cities can differ from the area average. Sources and methods.