Weather in Nantes in August

Prime time. If you get to pick your dates, August is the one. Highs average 24.5 °C, lows 13.8 °C, and rain falls on 9 days — nothing in the month is working against you.

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

Rain on 9 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

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest August day reached 35.1 °C and the coldest night fell to 8.1 °C, and the wettest single day dropped 31 mm — roughly 60% of the month's rain in one day.

August is moderately variable: 17 mm in the driest year against 107 mm in the wettest, around an average of 52 mm. Roughly two Augusts in three land near that average, and the third does something else entirely.

Wind is light at 9 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 76%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 24.7 °C in July, 24.5 here, 22.2 in September. Nothing about the timing within the month matters much.

Daylight in August

14.3 hours of daylight, losing 1.5 hours across the month. That is between Nantes's extremes of 15.9 and 8.5 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 20.5 °C in August — 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.

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

August in Nantes versus nearby

If Nantes is one option among several, the nearby comparison is worth making. Bordeaux is close enough to be a coin toss — 3.3 °C warmer, the same number of rain days. Le Havre is close enough to be a coin toss — 3.8 °C cooler, 3 days more rain.

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

Every month in Nantes

See all twelve months in Nantes, or where else to go in August.