January Weather in Hyannis, United States

Last updated: June 24, 2025

In January, the average temperature in Hyannis, United States hovers around -3°C (27°F), with a minimum dip of -28°C (-17°F) and a maximum reaching 15°C (60°F). Expect precipitation of about 14 mm (0.5 in) over 3 days, along with an average humidity level of 73%. Prepare for a chilly month and dress accordingly!

January Temperature in Hyannis

In January in Hyannis, the average temperature is -3°C (27°F). The maximum can reach 15°C (60°F), while the minimum can plummet to as low as -28°C (-17°F). Be prepared for a wide range of temperatures when traveling to Hyannis this month.

January Weather in Hyannis: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Hyannis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hyannis, January typically has an average temperature of -3°C (27°F), with highs reaching up to 15°C (60°F) and lows dropping to around -28°C (-17°F).

Data source: Temperature data for Hyannis generated using information from the Copernicus Climate Change Service.

January Precipitation in Hyannis

In Hyannis in January, the precipitation amount is 14 mm (0.5 in) over the course of 3 days.

January Precipitation Trends in Hyannis

The chart displays monthly precipitation patterns in Hyannis, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Hyannis, January typically receives around 14 mm (0.5 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Hyannis

In Hyannis in January humidity is 73%. With an average temperature of -3°C (27°F), this humidity feels like a biting chill that numbs the skin, making it essential for travelers to bundle up in warm layers and be prepared for the dampness that seeps through clothing, potentially leading to an uncomfortable experience outdoors.

January Average Humidity in Hyannis

This chart illustrates the average monthly humidity levels in Hyannis, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Hyannis is approximately 73%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Hyannis

In Hyannis in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Hyannis, you can check the information here.

Maximum UV Index Levels in Hyannis for January

The chart shows the monthly maximum UV Index (UVI) for Hyannis in January, 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 January, the maximum UV index in Hyannis typically reaches 3, which falls under the moderate exposure category.

Data source: Hyannis January 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 January Weather in Hyannis Compares to Other Months

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

This table compares monthly weather conditions in Hyannis, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (27°F)	14 mm (0.5 inches)	73%	moderate
February Weather	-4°C (25°F)	24 mm (0.9 inches)	80%	moderate
March Weather	3°C (38°F)	63 mm (2.5 inches)	64%	high
April Weather	7°C (44°F)	49 mm (1.9 inches)	64%	very high
May Weather	13°C (55°F)	136 mm (5.4 inches)	76%	very high
June Weather	21°C (70°F)	56 mm (2.2 inches)	79%	extreme
July Weather	23°C (74°F)	63 mm (2.5 inches)	77%	extreme
August Weather	21°C (71°F)	58 mm (2.3 inches)	79%	very high
September Weather	18°C (65°F)	46 mm (1.8 inches)	70%	very high
October Weather	8°C (46°F)	36 mm (1.4 inches)	64%	high
November Weather	3°C (38°F)	22 mm (0.9 inches)	75%	moderate
December Weather	-1°C (30°F)	21 mm (0.8 inches)	78%	moderate