Weather in Waikowhai in May

A hard month. May is a hard month in Waikowhai, and worth planning around. You should expect rain on 18 days of the month, which is more days wet than dry.

May ranks 8 of 12 in Waikowhai: past the worst of the year but short of February, which is the month to book if the dates are open.

Rain on 18 days, 6 of them heavy. Enough to need a plan B, not enough to need a plan around it. Layers, and a genuinely waterproof outer — at 13.4 °C the difference between a good day and a miserable one is entirely down to what you are wearing.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 4.2 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest May day reached 21 °C and the coldest night fell to 1.9 °C, and the wettest single day dropped 69 mm — roughly 39% 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 325 mm against 93 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 178 mm average is a reasonable planning figure, not a promise.

Wind is light at 10.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 88%, which at 13.4 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How May sits in the year

The month is on the way down: 2.3 °C cooler than April, with June dropping another 2.2 °C. The first week and the last are not the same trip.

Daylight in May

9.7 hours of daylight, losing 1 hours across the month. That is between Waikowhai'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 15.4 °C in May — cold — a quick dip rather than a swim, and a wetsuit if you are in for longer. The sea peaks at 17.8 °C in February and bottoms out at 12.9 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

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

May in Waikowhai versus nearby

If Waikowhai is one option among several, the nearby comparison is worth making. Wanaka is close enough to be a coin toss — 2.1 °C cooler, 1 day less rain. Greymouth is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: May is a compromise. February is 26 points better and is what Waikowhai is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Waikowhai

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