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 perfect. 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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit New Zealand, check out our Blenheim's climate page.
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
*
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 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 →
perfect weather
pleasant
tolerable
unpleasant
poor
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.What To Do in Blenheim in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit New Zealand, check out our Blenheim's climate page.
Temperature Rainfall Sunshine Humidity
See the full Blenheim climate overview or explore weather in New Zealand.
