Weather in Jackson in September

Shoulder season. September is shoulder season in Jackson — cheaper, quieter, and a genuine gamble. Highs average 31.5 °C, lows 19.4 °C, and rain falls on 10 days — nothing in the month is working against you.

September ranks 6 of 12 in Jackson: past the worst of the year but short of October, which is the month to book if the dates are open.

Rain on 10 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 31.5 °C days and 19.4 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 5 days clear 35 °C, so a serious heatwave is normal rather than notable. Across the twenty years measured, the hottest September day reached 39 °C and the coldest night fell to 6.7 °C, and the wettest single day dropped 97 mm — roughly 99% of the month's rain in one day.

September is moderately variable: 14 mm in the driest year against 235 mm in the wettest, around an average of 98 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 2.9 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 72%.

How September sits in the year

The month is on the way down: 1.9 °C cooler than August, with October dropping another 5.3 °C. The first week and the last are not the same trip. Rain has already shifted: 7 days fewer than August had.

Daylight in September

12.4 hours of daylight, losing 1 hours across the month. That is between Jackson's extremes of 14.3 and 10.1 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 31.6 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

September in Jackson versus nearby

If Jackson is one option among several, the nearby comparison is worth making. Baton Rouge is close enough to be a coin toss — within a degree on temperature, 3 days more rain. New Orleans is close enough to be a coin toss — 2.2 °C cooler, 4 days more rain.

So: September is a compromise. October is 23 points better and is what Jackson is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Jackson

See all twelve months in Jackson, or where else to go in September.