Weather in Mobile in December

A good month. December works. It is not the peak, but nothing about it fights you. Highs average 17 °C, lows 9.9 °C, and rain falls on 11 days — nothing in the month is working against you.

December ranks 7 of 12 in Mobile: past the worst of the year but short of November, which is the month to book if the dates are open.

Rain on 11 days, 4 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 17 °C days and 9.9 °C nights; the spread matters more here than any single number.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest December day reached 24 °C and the coldest night fell to -1.6 °C, and the wettest single day dropped 91 mm — roughly 65% of the month's rain in one day.

December is moderately variable: 34 mm in the driest year against 380 mm in the wettest, around an average of 139 mm. Roughly two Decembers in three land near that average, and the third does something else entirely.

Wind is light at 11.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 83%, high enough to notice on the warm days without dominating them.

How December sits in the year

The month is on the way down: 3.8 °C cooler than November, with January dropping another 1.9 °C. The first week and the last are not the same trip.

Daylight in December

December sits at the dark end of Mobile's year — 10.2 hours of daylight against 14.1 at midsummer, holding steady all month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

Sea temperature

The sea sits at about 21.3 °C in December — comfortable for a proper swim. The sea peaks at 29.8 °C in August and bottoms out at 19 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

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

December in Mobile versus nearby

If Mobile is one option among several, the nearby comparison is worth making. New Orleans is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Montgomery is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: December works, with November the better month by 16 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Mobile

See all twelve months in Mobile, or where else to go in December.