Weather in Dunedin in May

Shoulder season. May sits in between. You will get good days and you will lose some. Highs sit at 11.8 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

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

Rain on 13 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Layers, and a genuinely waterproof outer — at 11.8 °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 — 3.3 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest May day reached 20.3 °C and the coldest night fell to 3.2 °C, and the wettest single day dropped 57 mm — roughly 83% of the month's rain in one day.

May is moderately variable: 10 mm in the driest year against 170 mm in the wettest, around an average of 69 mm. Roughly two Mays in three land near that average, and the third does something else entirely.

Wind sits around 19.2 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 84%, which at 11.8 °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 °C cooler than April, with June dropping another 1.9 °C. The first week and the last are not the same trip.

Daylight in May

9.5 hours of daylight, losing 1.1 hours across the month. That is between Dunedin's extremes of 15.7 and 8.7 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 10.7 °C in May — too cold to swim without a wetsuit. The sea peaks at 13 °C in February and bottoms out at 8.7 °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

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

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

May in Dunedin versus nearby

If Dunedin is one option among several, the nearby comparison is worth making. Papatowai is close enough to be a coin toss — within a degree on temperature, 4 days more rain. Wanaka is the weaker option in May — within a degree on temperature, 4 days more rain.

So: May works, with February the better month by 18 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Dunedin

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