Weather in Graz in May

A good month. May works. It is not the peak, but nothing about it fights you. You should expect rain on 15 days of the month, which is more days wet than dry.

May ranks 2 of 12 in Graz. Only September scores clearly higher, and the difference is small enough to be settled by price rather than weather.

This is persistent light rain rather than storms: 15 wet days but only 2 heavy ones. It rarely cancels anything outright, and it rarely fully clears either. A jacket beats an umbrella. 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 May reaches 30 °C. Across the twenty years measured, the hottest May day reached 32.9 °C and the coldest night fell to -0.3 °C, and the wettest single day dropped 38 mm — roughly 42% of the month's rain in one day.

May is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest May on record still delivered 131 mm against 45 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 90 mm average is a reasonable planning figure, not a promise.

Wind is light at 6.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 71%.

How May sits in the year

The month is on the way up: 4.4 °C warmer than April, and June adds another 4.5 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short. Rain has already shifted: 5 days more than April had.

Daylight in May

15 hours of daylight, gaining 1.2 hours across the month. That is between Graz'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 — 31.3 °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.

May in Graz versus nearby

If Graz is one option among several, the nearby comparison is worth making. Villach is close enough to be a coin toss — within a degree on temperature, 2 days more rain. Zagreb is close enough to be a coin toss — within a degree on temperature, 2 days less rain.

So: May is effectively as good as it gets here — 5 points behind September, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Graz

See all twelve months in Graz, or where else to go in May.