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New Zealand weather

Weather in Blenheim for December 2025

Your guide to Blenheim weather in December - trends and predictions

    Temperatures

  • In general, the average temperature in Blenheim at the beginning of December is 17.1 °C. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 20 °C by the end of December.

    • Rain 🌧️

  • Blenheim experiences moderate rainfall in December, with an average of 9 rainy days and a total precipitation of 201.3 mm.

Average dry days
22
Dry days
Average rainy days
9
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/10°
Temperatures
Average wind speed
27 km/h
Avg max wind
Average humidity
79 %
Avg humidity

Blenheim Weather December

Move between months or click on a day
November
January
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
17°
2
Light drizzle
15°
3
Light rain shower
16°
4
Light rain shower
17°
5
Cloudy
18°
6
Cloudy
17°
7
Patchy rain possible
20°
8
Patchy rain possible
18°
9
Overcast
20°
10
Light drizzle
19°
11
Overcast
18°
12
Partly cloudy
18°
13
Cloudy
19°
14
Sunny
20°
15
Partly cloudy
20°
16
Light rain shower
18°
17
Light rain shower
16°
18
Light rain shower
16°
19
Sunny
17°
20
Sunny
18°
21
Sunny
21°
22
Heavy rain at times
18°
23
Heavy rain at times
18°
24
Moderate or heavy rain shower
19°
25
Patchy rain possible
21°
26
Partly cloudy
20°
27
Patchy rain possible
19°
28
Patchy rain possible
19°
29
Sunny
21°
30
Moderate rain at times
21°
31
Sunny
19°

Temperatures trend during December in Blenheim

See the weather trend as well as the moving average line

December weather in Blenheim day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
1 Dec. Patchy rain possible
Patchy rain possible
 17° /10° 0.1 mm 6
2 Dec. Light drizzle
Light drizzle
 15° /11° 1.2 mm 5
3 Dec. Light rain shower
Light rain shower
 16° /13° 5.3 mm 6
4 Dec. Light rain shower
Light rain shower
 17° /13° 1.3 mm 6
5 Dec. Cloudy
Cloudy
 18° /12° 0 mm 6
6 Dec. Cloudy
Cloudy
 17° /11° 0 mm 6
7 Dec. Patchy rain possible
Patchy rain possible
 20° /9° 0 mm 7
8 Dec. Patchy rain possible
Patchy rain possible
 18° /11° 1.9 mm 6
9 Dec. Overcast
Overcast
 20° /10° 0.3 mm 7
10 Dec. Light drizzle
Light drizzle
 19° /11° 2.9 mm 7
11 Dec. Overcast
Overcast
 18° /10° 0 mm 6
12 Dec. Partly cloudy
Partly cloudy
 18° /10° 0.1 mm 6
13 Dec. Cloudy
Cloudy
 19° /9° 0.1 mm 7
14 Dec. Sunny
Sunny
 20° /11° 0 mm 7
15 Dec. Partly cloudy
Partly cloudy
 20° /11° 0 mm 7
16 Dec. Light rain shower
Light rain shower
 18° /12° 4.8 mm 6
17 Dec. Light rain shower
Light rain shower
 16° /12° 2 mm 5
18 Dec. Light rain shower
Light rain shower
 16° /11° 0.7 mm 6
19 Dec. Sunny
Sunny
 17° /12° 3.2 mm 6
20 Dec. Sunny
Sunny
 18° /10° 9.1 mm 6
21 Dec. Sunny
Sunny
 21° /11° 0.3 mm 7
22 Dec. Heavy rain at times
Heavy rain at times
 18° /12° 2.6 mm 6
23 Dec. Heavy rain at times
Heavy rain at times
 18° /13° 5.4 mm 5
24 Dec. Moderate or heavy rain shower
Moderate or heavy rain shower
 19° /12° 3.6 mm 5
25 Dec. Patchy rain possible
Patchy rain possible
 21° /12° 0.5 mm 6
26 Dec. Partly cloudy
Partly cloudy
 20° /12° 2.7 mm 6
27 Dec. Patchy rain possible
Patchy rain possible
 19° /13° 3.3 mm 5
28 Dec. Patchy rain possible
Patchy rain possible
 19° /12° 0.3 mm 6
29 Dec. Sunny
Sunny
 21° /13° 8 mm 6
30 Dec. Moderate rain at times
Moderate rain at times
 21° /12° 12.4 mm 6
31 Dec. Sunny
Sunny
 19° /10° 6 mm 6
Next
Important Notice
Our weather forecast for Blenheim in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Blenheim forecast closer to your planned date for the most up-to-date weather information.
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Blenheim in December - FAQ

What are the expected maximum and minimum temperatures in Blenheim during December?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Blenheim during December?
Significant rainfall exceeding 201.3 mm is expected in Blenheim during December, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Blenheim during December?
The average wind speed in Blenheim during December is 27 km/h, suggesting breezy to windy conditions, depending on your activities.

December rainfall patterns in Blenheim

Explore the daily rainfall trends and prepare for Blenheims December weather 💧

UV exposure in Blenheim during December

Stay informed about UV levels for safe outdoor activities throughout the month of December ☀️

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Get accurate weather forecasts for Blenheim, located at latitude -41.516 and longitude 173.953. Stay updated with localized weather information tailored for Blenheim.

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