Milford Sound Tours

Milford Sound Weather Month by Month

Milford Sound is one of the wettest places in New Zealand, and the rain is part of the show. It fills the waterfalls you sail past. Here is what each month brings, from NIWA's long-run records for the airport, and what it means for the Milford Sound day tour you book.

What the weather does to a visit here

Rain rarely stops a cruise. The boats sail in it, and after heavy rain the walls of the fiord run with temporary waterfalls. A dry day gives you the reflections and the peak in full; a wet day gives you water pouring off every cliff. Both are worth the trip.

What weather does stop is flights and, in winter, sometimes the road. Cloud grounds the planes and the helicopters. Snow, ice and avalanche risk can close the Milford Road, and DOC tells you to expect closures and delays in winter.

The figures below are NIWA's 1991 to 2020 normals for Milford Sound Airport. About 6,545 mm falls in an average year, over about 185 rain days. DOC puts the area's rain at up to 7 m a year.

Milford Sound month by month

Milford Sound weather in January

Highs average 20 °C and lows 11 °C. About 667 mm of rain falls over 16 rain days. The wettest month of the year, and the waterfalls show it. It is peak season, so book ahead and sail early or late.

Milford Sound weather in February

Highs average 20 °C and lows 11 °C. About 467 mm of rain falls over 13 rain days. The warmest month and the one with the fewest rain days. The coaches are busy, so book ahead and sail early or late.

Milford Sound weather in March

Highs average 18 °C and lows 9 °C. About 571 mm of rain falls over 14 rain days. Still warm, and still busy. The rain rises again, which keeps the falls running for your cruise.

Milford Sound weather in April

Highs average 16 °C and lows 7 °C. About 528 mm of rain falls over 13 rain days. Cooler, and the busy season ends with the month. The Great Walks season on the track ends on the 30th.

Milford Sound weather in May

Highs average 12 °C and lows 5 °C. About 645 mm of rain falls over 16 rain days. The second-wettest month, and DOC's winter begins. Snow can reach the road, so carry chains if the signs say so.

Milford Sound weather in June

Highs average 9 °C and lows 2 °C. About 440 mm of rain falls over 15 rain days. The driest month by volume, and one of the coldest. Ice lingers in the shade, so leave Te Anau after 9am.

Milford Sound weather in July

Highs average 9 °C and lows 2 °C. About 468 mm of rain falls over 14 rain days. The coldest month, days and nights. Drive with extra care in the shade, and check the road first. Tawaki start their breeding season.

Milford Sound weather in August

Highs average 11 °C and lows 3 °C. About 457 mm of rain falls over 16 rain days. Cold and quiet on the road. Tawaki are nesting, and the road can close for snow or avalanche risk.

Milford Sound weather in September

Highs average 13 °C and lows 4 °C. About 541 mm of rain falls over 18 rain days. One of the two months with the most rain days. DOC's winter on the road ends with the month, and tawaki are still breeding.

Milford Sound weather in October

Highs average 15 °C and lows 6 °C. About 617 mm of rain falls over 18 rain days. As many rain days as September. The busy season starts, and traffic lights return to the tunnel at peak times.

Milford Sound weather in November

Highs average 16 °C and lows 8 °C. About 558 mm of rain falls over 15 rain days. The Great Walks season on the track opens on the 1st. It is the last month of the tawaki breeding season.

Milford Sound weather in December

Highs average 18 °C and lows 10 °C. About 585 mm of rain falls over 17 rain days. Warm again, with rain on more than half the days. Book cruises and parking early for the holidays.

The seasons, and which one you want

SeasonAverage highAverage lowRain a monthRain days a month
Summer: December to February19 °C10 °CAbout 573 mmAbout 15
Autumn: March to May16 °C7 °CAbout 582 mmAbout 14
Winter: June to August10 °C2 °CAbout 455 mmAbout 15
Spring: September to November15 °C6 °CAbout 572 mmAbout 17

Summer, December to February, is the warmest and the busiest. DOC counts the busy season from October to April, when the coaches fill the road and the tunnel runs on traffic lights. Book ahead in these months, and sail early or late.

Winter, June to August, is cold and quieter. It is also the driest by volume, though it still rains on about half the days. The road needs more care, and chains may be required. From July, tawaki are on the shore.

Spring and autumn sit in between. Spring has the most rain days and the tail of the tawaki season. Autumn keeps summer's warmth into March and quietens after April. For the best month by what you want to do, see the things to do.

Best time of day

The coaches from Queenstown reach the fiord around the middle of the day. An early or late cruise misses most of them, and you get a quieter boat.

In winter, leave Te Anau after 9am. DOC suggests a later start, once the shaded corners have had time to thaw. In summer, an early start also gets you a car park space near the terminal.

Book a cruise you can move. Most day cruises refund up to 24 hours before. If the forecast turns, move the day rather than the plan.

What to pack for the weather

Frequently asked questions

Is it worth going in the rain?
Often more so. Rain fills hundreds of short-lived waterfalls down the walls of the fiord. Flights are the part that cancels in bad weather; the boats usually sail.
How much rain falls there?
About 6.5 metres a year over roughly 185 rain days, going by NIWA's 1991 to 2020 averages for Milford Sound Airport. That rain is what fills the waterfalls you cruise past.
Is the Milford Road open in winter?
Usually, but it closes for avalanche control on about eight days a year, mostly in winter. Carry chains when the signs say so; you can hire them in Te Anau.
What is the warmest month at Milford Sound?
February, with highs averaging 20 °C in NIWA's 1991-2020 normals. It also has the fewest rain days, about 13.
What should I wear?
A waterproof jacket in every month, and warm layers under it. The wind on the open deck can feel colder than the air at the terminal.

Where these facts come from

Temperatures, rainfall and rain days are NIWA's 1991 to 2020 normals for Milford Sound Airport, checked 21 September 2026. A rain day is one with 1 mm or more. The seasons on the road, the winter advice and the tunnel lights are DOC's. The tawaki season is DOC's species page.

Tours that run in the rain, or refund the flight