Weather in Luzern in August

A good month. August works. It is not the peak, but nothing about it fights you. You should expect rain on 17 days of the month, which is more days wet than dry.

August ranks 4 of 12 in Luzern: past the worst of the year but short of September, which is the month to book if the dates are open.

This is wet-season rain: 17 wet days and 6 genuinely heavy ones, which in this climate means concentrated downpours rather than all-day grey. The pattern is usually a clear morning and a loud afternoon, so front-load the day and stop fighting the 3pm hour. 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 34.9 °C and the coldest night fell to 8.1 °C, and the wettest single day dropped 66 mm — roughly 42% of the month's rain in one day.

August is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest August on record still delivered 255 mm against 83 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 158 mm average is a reasonable planning figure, not a promise.

Wind is light at 5.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 78%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 24.3 °C in July, 24 here, 20.4 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 Luzern's extremes of 15.9 and 8.5 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 26.2 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

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 Luzern versus nearby

If Luzern is one option among several, the nearby comparison is worth making. Zermatt is close enough to be a coin toss — 5.5 °C cooler, 2 days less rain. Colmar is a better bet in August — 2 °C warmer, 3 days less rain.

So: August works, with September the better month by 8 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Luzern

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