San Juan Weather in December

What's the weather like in San Juan (Texas) in December 2025?

The climate in San Juan during December can be summarized as mild and dry.

December is in the winter in San Juan and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around 22°C (72°F), whilst at night 11°C (51°F) is normal.

San Juan weather averages (imperial / metric)
Daytime temperature 22°C 71.5°F
Nightly temperature 10.7°C 51.2°F
Average temperature 16.3°C 61.3°F
Daily sunshine 4.4 hrs
Avg rainfall 29 mm 1.1 ins
Rainy days 4 days
Sea temperature 22.2°C 71.9°F
Humidity 75%
Windspeed 15.8kph 10 mph

On average December is the 3rd driest month of the year in San Juan with around 29mm 1.1 inches of rain making it a dry time to visit. This rainfall is typically spread over 4 days, although this may vary considerably.

On the flip side this corresponds to an average of 4.4 hours of sunshine per day.

December temperatures in San Juan

San Juan average temperature in December

December rainfall

San Juan average rain in December

December hourly sunshine

San Juan 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 San Juan in December 2025.

Other monthly averages

Best places to visit in December

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

San Juan weather stats

San Juan weather statistics
Hottest month: August 35.3°C 95.5°F
Driest month: March 13mm 0.5ins
Sunniest month: July 10.4hrs
Coldest month: January 20.3°C 68.5°F
Wettest month: September 110mm 4.3ins
Map showing location of San Juan (26.18924, -98.15529) San Juan map pin © Google

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