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Oamaru Weather in December

With daytime temperatures of 17°C (63°F) and nighttime lows of 11°C (52°F), December in Oamaru brings moderate temperatures during the day. It is also the wettest month of the year, so pack an umbrella.

Rainfall in Oamaru in December

During the wettest month of the year, an umbrella can be your best friend to stay dry. You can typically expect 13 days of rain this month, averaging around 92 mm (3.6 in). When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Oamaru in December

Daytime highs in Oamaru in December reach 17°C (63°F), with nights around 11°C (52°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights drop to around 11°C (52°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

If you prefer enjoying temperate temperatures and rain-free days, January and February typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

Oamaru Temperature in December

Min Temperature

11°C (52°F)

Max Temperature

17°C (63°F)

Chance of Rain

43%

Precipitation

92 mm (3.6 in)

Rainy days

13 days

Oamaru Weather by Month

Pick a month to see the average temperature, rainfall and sunshine in Oamaru - and find the best time to visit.

January

18°C (64°F)View January → February

18°C (64°F)View February → March

17°C (63°F)View March → April

15°C (59°F)View April → May

13°C (55°F)View May → June

11°C (52°F)View June → July

10°C (50°F)View July → August

11°C (52°F)View August → September

13°C (55°F)View September → This monthOctober

14°C (57°F)View October → November

15°C (59°F)View November → December

17°C (63°F)View December →

Best Time to Visit Oamaru →

Daily Historical Temperatures

46-year average (1976-2025)

Based on our historical records, temperatures in Oamaru typically stay consistent throughout December, with daily highs averaging around 17°C (63°F). Nights are cool, with lows around 11°C (52°F).

Average temperatures in December

Historical weather records for Oamaru in December

Browse day-by-day weather records for Oamaru spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Oamaru historical weather extremes in December

Based on weather observations in Oamaru between 2006 and 2025, these are the recorded extremes during December.

The warmest day in December was on December 22, 2021, with a maximum of 27°C (81°F).
On December 1, 2016, Oamaru saw its coldest December day with temperatures maxing out at 10°C (50°F).
The lowest overnight temperature recorded in December was 4°C (39°F) (December 20, 2025).
The heaviest December precipitation occurred on December 28, 2010, when 36 mm (1.4 in) of precipitation fell.

Best Places in New Zealand in December

Find out more about the weather in New Zealand and which places have the best travel conditions in this month. See all of New Zealand in December →

Conditions Temperatures Precipitation

Temperatures Precipitation

perfect weather

pleasant

tolerable

unpleasant

poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Marker color shows the average daytime high temperature in December: blue is cold, red is hot.

Marker color shows total monthly precipitation in December: pale blue is dry, deep blue is wet.

What to Wear in Oamaru in December

For Oamaru in December, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho.