Block Island weather in December 2025

Expect daytime maximum temperatures of 41°F in Block Island, Rhode Island in December based on long-term weather averages. There are 5 hours of sunshine per day on average with 11 days with some rainfall and typically 4.6 inches of rainfall in the month, which might fall as snow.

  • 41°F maximum daytime temperature in December in Block Island41
    41°F max day temperature
  • 5 hours of sunshine per day
  • 11 days with some rainfall in December in Block Island11
    11 days with some rainfall
  • 27°F minimum night-time temperature in December in Block Island27
    27°F min night temperature
  • 9 hours of daylight per day in December in Block Island9
    9 hours of daylight per day
  • No heat & humidity in December in Block Island0
    No heat & humidity
  • 4.6 inches monthly rainfall in December in Block Island4.6
    4.6 inches of monthly rainfall
  • UV (maximum) index 1 (Low) in December in Block Island1
    1 (Low) UV index
  • 48°F sea temperature in December in Block Island48
    48°F sea temperature

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The December weather guide for Rhode Island (Block Island) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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How cold is it in Block Island in December?

Daytime temperatures usually reach 41°F in Block Island in December, falling to 27°F at night.

How sunny is it in Block Island in December?

There are normally 5 hours of bright sunshine each day in Block Island in December - that's 51% of daylight hours.

How warm is the sea around Block Island in December?

The average sea temperature around Block Island in December is 48°F.

Does it rain in Block Island in December?

There are usually 11 days with some rain in Block Island in December and the average monthly rainfall is 4.6 inches. Rain may fall as snow in this month.

Block Island December sunrise & sunset times

Browse the sunrise and sunset times for Block Island in December 2025. Select a month to view Block Island sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 06:53 16:18
Tuesday, 16th December 2025 07:06 16:19
Wednesday, 31st December 2025 07:12 16:27

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