Doubtful And Dusky Sound Helicopter Scenic Flight from Te Anau
Ninety minutes from Te Anau Airport over two fiords, landing above each, with the pilot's commentary through headsets. 120 kg limit per passenger.
From $897 per person
Check AvailabilityDoubtful Sound Weather
Doubtful Sound is one of the wettest places you can visit in New Zealand, and the weather shapes your day more than the timetable. If you are choosing a Doubtful Sound boat tour, read the month you plan to go, then pack for rain whatever it says.
What the weather does to a Doubtful Sound day
Rain does not stop the cruises. Every listing says it runs in all weather, and a wet day is when waterfalls pour off every wall of the fiord. Visit Fiordland says there is a good chance it will rain when you visit.
What weather can stop is the helicopter. The flights land only if the weather allows, and a flight called off for weather is rebooked or refunded. Book yours early in your stay, so there is time to try again.
Wind matters on the lake. DOC says Lake Manapouri can turn rough and choppy, particularly in the afternoons. On Wilmot Pass, the gravel road can bring heavy snow or rain, DOC warns. The coach drivers cross it every day; you only ride.
Doubtful Sound month by month
The figures are NIWA's long-run normals for West Arm on Lake Manapouri, 1991 to 2020, not a forecast. West Arm is where every trip leaves the lake for the pass. Visit Fiordland puts the fiord itself at around 6 m of rain a year.
Doubtful Sound weather in January
Highs average 19.4°C and lows 9.6°C at West Arm. Rain averages about 366 mm. The warmest month, with dawn about 5:30 am and dusk about 9:30 pm. It is also one of the wetter ones. Pack insect repellent for the wharves.
Doubtful Sound weather in February
Highs average 19.1°C and lows 9.3°C at West Arm. Rain averages about 249 mm. Still warm, and one of the drier months. Tawaki are moulting ashore until early March. The long evenings suit the overnight cruise.
Doubtful Sound weather in March
Highs average 16.8°C and lows 7.8°C at West Arm. Rain averages about 231 mm. The driest month on the normals, and often still warm. Autumn starts, and mornings turn cool on the lake. The forest stays green.
Doubtful Sound weather in April
Highs average 13.2°C and lows 5.9°C at West Arm. Rain averages about 275 mm. Cooler mornings and mist in the arms. Visit Fiordland says it cools towards the end of the month. Pack a warm layer.
Doubtful Sound weather in May
Highs average 9.7°C and lows 4.1°C at West Arm. Rain averages about 413 mm. The wettest month on the normals. Waterfalls are at their fullest. Autumn mist lies in the arms, and the days shorten fast.
Doubtful Sound weather in June
Highs average 6.7°C and lows 1.7°C at West Arm. Rain averages about 271 mm. Winter, the most settled season. Clear, cold days are common. Light runs from about 8:30 am to 4:30 pm, so the day trips start in the dark.
Doubtful Sound weather in July
Highs average 6.0°C and lows 0.7°C at West Arm. Rain averages about 329 mm. The coldest month. Snow reaches low levels, and there can be ice on the fiord. Wear thermals, a hat and gloves on deck.
Doubtful Sound weather in August
Highs average 7.9°C and lows 1.8°C at West Arm. Rain averages about 254 mm. Still cold, and often clear. Tawaki are in their breeding season. Snow can lie on Wilmot Pass, and the coach crosses it anyway.
Doubtful Sound weather in September
Highs average 11.0°C and lows 3.4°C at West Arm. Rain averages about 375 mm. Spring, and the equinox. Wind and rain rise, and the lake can chop up. Snow can still fall to low levels.
Doubtful Sound weather in October
Highs average 13.2°C and lows 4.7°C at West Arm. Rain averages about 377 mm. The second-wettest month. Days lengthen fast, and tawaki are still nesting. Pack for wind as well as rain, and expect full waterfalls.
Doubtful Sound weather in November
Highs average 15.4°C and lows 6.2°C at West Arm. Rain averages about 300 mm. The end of the tawaki breeding season. Warmer days, still unsettled. Book a summer date now if you want the overnight.
Doubtful Sound weather in December
Highs average 17.9°C and lows 8.3°C at West Arm. Rain averages about 312 mm. Summer begins, with the warmest months ahead. The southern rata flowers red along the shore. Light lasts until about 9:30 pm.
The seasons, and which one you want
| Season | Average high | Average low | Rain |
|---|---|---|---|
| Summer: December–February | 18.8°C | 9.1°C | 927 mm |
| Autumn: March–May | 13.2°C | 5.9°C | 920 mm |
| Winter: June–August | 6.9°C | 1.4°C | 854 mm |
| Spring: September–November | 13.2°C | 4.8°C | 1,052 mm |
Summer gives you the warmest days and the longest light, and the busiest boats. Autumn is cooler and quieter, with mist in the arms. Both carry plenty of rain, as every season does here.
Winter is the most settled season, Visit Fiordland says, often blue and cloudless, with snow to low levels. It is cold and the days are short. Spring brings the equinox, with more wind and rain. Weighed against what you want to see, the choice is set out on the best time to visit.
Keep one spare day. If a flight is called off or you
want a clearer day on the fiord, a spare day in Te Anau lets you move the plan.
Best time of day
The day cruises follow a timetable, so the hour is not yours to choose. What you can choose is to be early: the lake is often calmer in the morning, before the afternoon chop DOC warns of.
On the overnight cruise you are on the fiord at dusk and again after breakfast. Still water and low light come at those hours, and a day trip never sees them.
What to pack for the rain
- A proper waterproof: West Arm averages over 230 mm in its driest month.
- Warm layers all year: even January lows average 9.6°C.
- Insect repellent: the sandflies meet you at every wharf.
- A hat and gloves in winter: July highs average 6.0°C.
The rest of the day's kit, from food on board to check-in, is in the visitor guide.
Frequently asked questions
What happens if it rains?
The cruises run in all weather, and rain is when the waterfalls are at their best. Doubtful Sound gets around 6 m of rain a year, so pack a waterproof whatever the forecast. When the operator cancels for weather, you are offered another date or a full refund.
How much rain does Doubtful Sound get?
Visit Fiordland puts it at around 6 m a year. NIWA's normals for West Arm, on Lake Manapouri where every trip changes from boat to coach, are about 3,753 mm.
What is the wettest month?
May, on NIWA's normals for West Arm, at about 413 mm. March is the driest, at about 231 mm, but no month is dry.
Do helicopter flights go in bad weather?
Not always. The helicopters land only if the weather allows, and a flight called off for weather is rebooked or refunded.
How cold is it on the fiord in winter?
July highs average 6.0°C and lows 0.7°C at West Arm. It feels colder on deck in the wind, so wear thermals, a hat and gloves.
Where these facts come from
Temperatures and rainfall are NIWA's 1991-2020 station normals for Manapouri, West Arm Jetty, read from the climate table that cites them, checked 26 September 2026. The seasons, the daylight and the fiord's rain are Visit Fiordland's; the lake and the pass road are the Department of Conservation's. The flight and refund rules come from each tour's own listing.
- Climate station normals (NIWA)
- Manapouri climate tables citing NIWA (Wikipedia)
- Doubtful Sound (Visit Fiordland)
- Weather and seasons (Visit Fiordland)
- Weather and climate in Fiordland (Department of Conservation)
- Lake Manapouri area (Department of Conservation)
- Get a permit to drive on the pass road (Department of Conservation)
Trips to weigh against the forecast
From Te Anau: Doubtful Sound Coach & Cruise
Eight and a half hours from Lakefront Drive in Te Anau: the coach to Manapouri, the lake, the pass and a 3-hour cruise. Food on sale on board, card only.
From $216 per person
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Doubtful Sound Overnight Cruise
About 20 hours on the fiord: an afternoon cruise, a three-course dinner, a cabin at anchor and breakfast on the water. Booked in twos, and non-refundable.
From $462 per person, bookings of two
Check AvailabilityNext: see things to do around Doubtful Sound, check the FAQs, or compare every tour on Doubtful Sound Tours.