Portsmouth Weather in December

What's the weather like in Portsmouth (Saint John) in December 2023?

The climate in Portsmouth during December can be summarized as hot, humid and very wet.

December is in the winter in Portsmouth and is typically the 4th coldest month of the year. Daytime maximum temperatures average around a steamy 29°C (84°F), whilst at night 22°C (71°F) is normal.

Portsmouth weather averages (imperial / metric)
Daytime temperature 29.1°C 84.4°F
Nightly temperature 21.7°C 71.1°F
Average temperature 25.4°C 77.7°F
Daily sunshine 6.8 hrs
Avg rainfall 201 mm 7.9 ins
Rainy days 18 days
Sea temperature 27.6°C 81.7°F
Humidity 80%
Windspeed 16.6kph 10 mph

On average December is the 5th wettest month of the year in Portsmouth with around 201mm 7.9 inches of rain making it a very wet time to visit. This rainfall is typically spread over 18 days, although this may vary considerably.

On the flip side this corresponds to an average of 6.8 hours of sunshine per day.

December temperatures in Portsmouth

Portsmouth average temperature in December

December rainfall

Portsmouth average rain in December

December hourly sunshine

Portsmouth average rain in December

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Portsmouth in December 2023.

Other monthly averages

Best places to visit in December

UV index Best time to go?

Portsmouth weather stats

Portsmouth weather statistics
Hottest month: July 30.6°C 87.1°F
Driest month: February 95mm 3.7ins
Sunniest month: April 8.6hrs
Coldest month: February 28.3°C 82.9°F
Wettest month: November 301mm 11.9ins
Map showing location of Portsmouth (15.58333, -61.46667)

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