January Weather in Belfast

Last updated: March 2, 2024

The weather in Belfast, United States, during January is characterized by an average temperature of -4°C (24°F). Highs can soar to 10°C (49°F), while lows may dip to -20°C (-3°F). Typically, the humidity level in Belfast throughout January hovers around 88%.

-20°C (-3°F)

Minimum temperature

-4°C (24°F)

Average temperature

10°C (49°F)

Maximum temperature

88%

Humidity

Precipitation and Sunshine hours

In January, Belfast averages 93 mm (3.7 inches) of rainfall, typically over the course of 9 rainy days. The month enjoys an average of 9 hours 15 minutes of daylight, with the sun shining for approximately 4 hours 40 minutes each day. Additionally, there is a 41% probability of sunny days during this period.

93 mm (3.7 inches)

Precipitation

9 rainy days

Rainy days

4 hours 40 minutes

Sunshine hours

41%

Chance of sun

UV Index

In January, the UV Index in Belfast reaches a maximum of 2, indicating a level of Low exposure. The most intense UV radiation typically occurs between 10:00 and 12:00, during which unprotected skin may burn in as little as 45 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 1 1 1 2 2 2 2 1 1 1 0 0 0
Exposure Low
Time to burn 45 min

Compare Belfast's Climate with Cities Worldwide