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Blenheim Weather in December

Blenheim in December sees pleasant temperatures, with highs around 20°C (68°F) and overnight lows of 12°C (54°F). Rainfall is fairly high at around 82 mm (3.2 in) on average, so pack waterproofs just in case.

Rainfall in Blenheim in December

You can typically expect 8 days of rain this month, averaging around 82 mm (3.2 in). When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Blenheim in December

The temperature in Blenheim in December is excellent. Daytime highs reach 20°C (68°F), with nights dropping to 12°C (54°F). The difference between afternoon and evening temperatures is usually noticeable. Nights drop to around 12°C (54°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.

Sunshine in Blenheim in December

There are approximately 245 hours of sunshine this month, resulting in mostly clear days.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March and December typically offer the best weather for Blenheim.

Blenheim Temperature in December

Min Temperature

12°C (54°F)

Max Temperature

20°C (68°F)

Chance of Rain

28%

Precipitation

82 mm (3.2 in)

Rainy days

8 days

Humidity

74% *

Sunshine

245 hours *

Percentage Sunshine

* Data from: Nelson, New Zealand (62 KM, 38 Miles).

Blenheim Weather by Month

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

January

22°C (72°F)View January → February

22°C (72°F)View February → March

20°C (68°F)View March → April

18°C (64°F)View April → May

15°C (59°F)View May → June

13°C (55°F)View June → July

12°C (54°F)View July → August

13°C (55°F)View August → September

15°C (59°F)View September → This monthOctober

17°C (63°F)View October → November

18°C (64°F)View November → December

20°C (68°F)View December →

Best Time to Visit Blenheim →

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Blenheim typically stay consistent throughout December, with daily highs averaging around 20°C (68°F). Nights are cool, with lows around 13°C (55°F).

Average temperatures in December

Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in December

Historical weather records for Blenheim in December

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

Blenheim historical weather extremes in December

The extremes listed below come from historical weather data collected in Blenheim from 1992 through 2025.

On December 25, 2012, temperatures climbed to 29°C (84°F), marking the warmest December day on record.
On December 7, 1993, Blenheim saw its coldest December day with temperatures maxing out at 12°C (54°F).
Nighttime temperatures dropped to 7°C (45°F) on December 31, 2006, marking the coldest December night on record.
The wettest December day on record brought 41 mm (1.6 in) of precipitation to Blenheim (December 30, 2011).

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 Blenheim in December

Pleasant temperatures in December mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.