Weather in Montpellier in September

Prime time. If you get to pick your dates, September is the one. Highs average 25.5 °C, lows 16.1 °C, and rain falls on 7 days — nothing in the month is working against you.

September ranks 3 of 12 in Montpellier. Only June scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 7 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest September day reached 34.3 °C and the coldest night fell to 8.8 °C, and the wettest single day dropped 54 mm — roughly 106% of the month's rain in one day.

September is moderately variable: 6 mm in the driest year against 136 mm in the wettest, around an average of 51 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 11.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 66%.

How September sits in the year

The month is on the way down: 4.1 °C cooler than August, with October dropping another 4.7 °C. The first week and the last are not the same trip.

Daylight in September

12.6 hours of daylight, losing 1.5 hours across the month. That is between Montpellier's extremes of 15.4 and 9 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 20.7 °C in September — swimmable, but it takes a moment to commit. This is the warmest the water gets all year.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, April is the trade worth considering — 11 points weaker on weather, and materially quieter.

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

September in Montpellier versus nearby

If Montpellier is one option among several, the nearby comparison is worth making. Marseille is close enough to be a coin toss — 2.2 °C warmer, 1 day less rain. Toulouse is close enough to be a coin toss — within a degree on temperature, 2 days more rain.

So: September is effectively as good as it gets here — 3 points behind June, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Montpellier

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