Milford Sound, New Zealand, a stunning glacier-carved fiord with majestic rock faces, thundering waterfalls and diverse flora and fauna, sits 307 km from Queenstown, 404 km from Dunedin and 121 km from Te Anau. . The Metservice had lifted its 'red' warning for Milford Sound, and no further weather warnings had been issued for the area. Milford Sound temperatures range from around 18 degrees Celsius (64 degrees F) in summer to 4 degrees (41 F) in winter. The November weather guide for Milford Sound, New Zealand shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute.Find out more about our data sources. Get the monthly weather forecast for Milford Sound, Southland, New Zealand, including daily high/low, historical averages, to help you plan ahead. MetService is New Zealand’s national weather authority, providing accurate town, city … Milford Sound, New Zealand: Annual Weather Averages January is the hottest month in Milford Sound with an average temperature of 15°C (59°F) and the coldest is July at 5°C (41°F) . 13°C sea temperature; Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec. The climate in Milford Sound during December can be summarized as mild and very wet. Make sure you have several warm clothing layers and perhaps a hat to keep warm during your Milford Sound cruise in winter! December is in the summer in Milford Sound and is typically the 3rd warmest month of the year. Most Milford Sound cruise boats have a mixture of indoor and outdoor seating and viewing areas. Milford Sound extended weather forecast, rain maps, rain radar and current conditions. The wettest month is January with an average of 717mm of rain. Find the most current and reliable 14 day weather forecasts, storm alerts, reports and information for Milford Sound, NZ with The Weather Network. A combination of sunny and rainy weather during this time allows visitors to see the many faces of Milford Sound. Visitors after some real adventure can reach Milford Sound on foot by trekking the Milford track that starts off from Te Anau. Daytime maximum temperatures average around a cool 16°C (61°F), whilst at night 6°C (43°F) is normal. Being the middle of summer, December is a busy time in Milford Sound with many visitors enjoying the highest average temperature of 9 degrees to 18 degrees Celsius.Summer also holds the record for the highest rainfall, with December having 648mm average rainfall and 17 days of rain.