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You’re probably checking the weather for Greenville Mississippi because you heard the Delta is flat and predictable. Honestly? It's anything but. People think it’s just cotton fields and endless humidity, but if you’ve lived here long enough, you know the weather has a personality that’s borderline moody. One minute you're sitting on a porch in 70-degree sun in January, and by midnight, you’re scrambling to wrap your pipes because a "Blue Norther" decided to drop the mercury by forty degrees.
It’s erratic.
Today, January 14, 2026, is a perfect example of that Delta swing. We’re sitting at a humid 51°F right now with some stubborn cloud cover. The wind is kicking up out of the west at about 7 mph, and there’s a 35% chance we’ll see some light rain before the day is done. But look at the overnight: we’re diving down to a low of 29°F. That’s a nearly 30-degree cliff. Tomorrow? Pure sunshine and a high of 44°F. Basically, if you don't like what's happening outside your window at Lake Ferguson, just wait a few hours.
The Humidity Myth and the "Real" Delta Summer
Most folks from up North think 90°F is hot. In Greenville, 90°F is just a suggestion. Because we’re tucked right into the crook of the Mississippi River, the humidity doesn't just sit there; it clings. It's a "humid subtropical climate," which is a fancy way of saying you’ll be sweating within thirty seconds of walking out the door in July.
Let’s talk numbers. July and August routinely hit average highs of 92°F, but that doesn't account for the heat index. When the dew point climbs—and it does, reaching "muggy" levels almost 30 days out of the month in mid-summer—the "feels like" temperature can easily crest 105°F. It’s heavy. Thick. You sort of breathe the air instead of just inhaling it.
Why Winter Isn't as "Mild" as You Think
- The Big Chill: We don't get much snow (average is about an inch a year), but the cold here is damp. It gets into your bones.
- January Extremes: While the average high is 53°F, we’ve seen some wild historical outliers. Back in 1963, Greenville hit a record low of -11°F.
- The Wind Factor: Because the terrain is so flat, there’s nothing to break the wind coming off the river. A 14 mph breeze in 30-degree weather feels like a slap in the face.
The crazy thing about the weather for Greenville Mississippi is the record-breaking potential. Just today, the record high for January 14 stands at a whopping 82°F (set in 1947), while the record low is 25°F (1963). That is a massive range for a single calendar day.
Storm Season and the River's Long Memory
Greenville wouldn’t exist without the river, but the river is also its biggest weather anxiety. We all know about the Great Flood of 1927. The gauge at the Greenville bridge still references that 65.4-foot record crest. Currently, the river is behaving—sitting around 11 feet—but spring is the real test.
April is arguably the most beautiful month here, but it’s also the most dangerous. It’s prime time for tornadoes. The clash of warm Gulf air meeting the tail end of winter’s cold fronts creates a literal battleground over Washington County. If you're new here, you’ve got to get used to the sound of the sirens. It's just part of the Delta lifestyle.
Rainfall Reality Check
We get a lot of rain. About 54 inches a year. December and March are typically the wettest months, and it’s rarely a "light drizzle." It’s usually a gully-washer that turns the loamy Delta soil into something resembling chocolate pudding.
- December: Average 4.9 inches.
- March: Average 4.7 inches.
- September: The "dry" month, but even then, you'll still get about 2.8 inches.
Surviving and Thriving in the Delta
If you're planning a trip to see the Delta Blues Museum or hit the Hot Tamale Festival in October, timing is everything. October is, hands down, the best month. The humidity finally breaks, the mosquitoes (mostly) go back to wherever they came from, and the "comfortable" days—where highs are between 65°F and 86°F—are at their peak.
Honestly, Greenville weather requires a specific kind of resilience. You learn to keep an ice scraper and a swimsuit in the car at the same time. You learn that "partly cloudy" usually means a thunderstorm is brewing somewhere over the river. And you learn that no matter how hot it gets, there’s nothing a cold sweet tea and a shaded porch can't fix.
📖 Related: Planet Fitness Teen Summer Pass 2025: Why Most People Get It Wrong
Actionable Delta Weather Tips
Keep an eye on the Lower Mississippi River Forecast Center if you live near the levee; river stages matter more here than anywhere else in the state. Sign up for Nixle alerts by texting "WASHCOUNTY" to 888-777 to get real-time severe weather updates directly from Washington County Emergency Management. If you're driving on Highway 82 during a summer downpour, pull over; Delta rain can turn visibility to zero in seconds. Finally, if you're planting a garden, wait until after the last frost in late March—Greenville's soil is legendary, but a surprise April freeze will kill your tomatoes faster than you can say "Mississippi."
Check the local radar at the Mid Delta Regional Airport (KGLH) for the most accurate nearby readings before heading out for a day on the water.