nomadseason

December Weather in San Marino, United States

Last updated: June 24, 2025

In December, the average temperature in San Marino, United States hovers around 13°C (56°F). Expect a minimum of 3°C (37°F) and a pleasant maximum of 27°C (82°F). Throughout the month, precipitation averages 72 mm (2.8 in) spread over 4 days, while the average humidity lingers at a comfortable 71%.

December Temperature in San Marino

In December in San Marino, the average temperature is 13°C (56°F), with maximums reaching up to 27°C (82°F) and minimums dropping as low as 3°C (37°F). This makes it an ideal time for travelers to enjoy mild weather while exploring all that San Marino has to offer.

December Weather in San Marino: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in San Marino, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Marino, December typically has an average temperature of 13°C (56°F), with highs reaching up to 27°C (82°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec555658636570757674696255
Data source: Temperature data for San Marino generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in San Marino

In San Marino in December, the precipitation amount is 72 mm (2.8 in) over the course of 4 days.

December Precipitation Trends in San Marino

The chart displays monthly precipitation patterns in San Marino, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In San Marino, December typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec75636723163224102072
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in San Marino

In San Marino in December humidity is 71%. With an average temperature of 13°C (56°F), this humidity feels like a damp embrace that can make exploring the area feel a bit stifling and requires light, breathable clothing to remain comfortable while traveling.

December Average Humidity in San Marino

This chart illustrates the average monthly humidity levels in San Marino, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in San Marino is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%79%75%71%70%72%73%69%68%67%68%71%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Marino

In San Marino in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in San Marino for better planning.

Maximum UV Index Levels in San Marino for December

The chart shows the monthly maximum UV Index (UVI) for San Marino in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in San Marino typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101011111010754
Data source: San Marino December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in San Marino Compares to Other Months

Weather in San Marino varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Marino, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Marino, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather13°C (56°F)75 mm (3.0 inches)74%moderate
February Weather13°C (56°F)63 mm (2.5 inches)79%high
March Weather14°C (58°F)67 mm (2.7 inches)75%very high
April Weather17°C (63°F)23 mm (0.9 inches)70%very high
May Weather18°C (65°F)16 mm (0.6 inches)70%very high
June Weather21°C (70°F)3 mm (0.1 inches)72%extreme
July Weather24°C (76°F)2 mm (0.1 inches)73%extreme
August Weather25°C (76°F)2 mm (0.1 inches)69%very high
September Weather23°C (74°F)4 mm (0.1 inches)68%very high
October Weather20°C (69°F)10 mm (0.4 inches)67%high
November Weather17°C (62°F)20 mm (0.8 inches)68%moderate
December Weather13°C (56°F)72 mm (2.8 inches)71%moderate

Compare San Marino's Climate with Cities Worldwide