Weather in Le Havre in September

Prime time. September is about as good as Le Havre gets. Highs average 19 °C, lows 14.1 °C, and rain falls on 10 days — nothing in the month is working against you.

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

Rain on 10 days, 1 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

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average September reaches 30 °C; the day barely swings — 4.9 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 27.9 °C and the coldest night fell to 9 °C.

September is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest September on record still delivered 108 mm against 18 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 54 mm average is a reasonable planning figure, not a promise.

Wind is light at 15.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 81%, high enough to notice on the warm days without dominating them.

How September sits in the year

The month is on the way down: 1.7 °C cooler than August, with October dropping another 3 °C. The first week and the last are not the same trip. Rain is the thing that moves: October brings 6 days more of it, so the earlier half of a flexible trip is the safer half.

Daylight in September

12.7 hours of daylight, losing 1.8 hours across the month. That is between Le Havre's extremes of 16.3 and 8.2 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 17.4 °C in September — cold — a quick dip rather than a swim, and a wetsuit if you are in for longer. 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.

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

September in Le Havre versus nearby

If Le Havre is one option among several, the nearby comparison is worth making. Paris is close enough to be a coin toss — 2.7 °C warmer, 1 day less rain. London is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: September is effectively as good as it gets here — 2 points behind July, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Le Havre

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