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January Weather in Mastic Beach, United States

Last updated: June 24, 2025

In Mastic Beach, United States, the average temperature in January hovers around 3°C (37°F). During this time, temperatures can dip to a chilly -13°C (8°F) or soar to a pleasant 15°C (59°F). Expect about 81 mm (3.2 in) of precipitation over approximately 8 days, contributing to an average humidity of 84%. Prepare for a brisk and damp month ahead!

January Temperature in Mastic Beach

In January in Mastic Beach, the average temperature is 3°C (37°F). Maximums can reach 15°C (59°F), while minimums can dip as low as -13°C (8°F). Be prepared for a mix of chilly and mild weather if you're traveling during this time.

January Weather in Mastic Beach: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Mastic Beach, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mastic Beach, January typically has an average temperature of 3°C (37°F), with highs reaching up to 15°C (59°F) and lows dropping to around -13°C (8°F).
JanFebMarAprMayJunJulAugSepOctNovDec373841485767757569615042
Data source: Temperature data for Mastic Beach generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Mastic Beach

In Mastic Beach in January, the precipitation amount is 81 mm (3.2 in) over the course of 8 days.

January Precipitation Trends in Mastic Beach

The chart displays monthly precipitation patterns in Mastic Beach, 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 Mastic Beach, January typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec81107106122117681009887139102134
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Mastic Beach

In Mastic Beach in January humidity is 84%. With an average temperature of 3°C (37°F), this humidity feels like a damp chill that seeps into your bones, making outdoor excursions brisk and invigorating, yet requiring extra layers to stay comfortable.

January Average Humidity in Mastic Beach

This chart illustrates the average monthly humidity levels in Mastic Beach, 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 Mastic Beach is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Mastic Beach

In Mastic Beach 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 Mastic Beach, you can check the information here.

Maximum UV Index Levels in Mastic Beach for January

The chart shows the monthly maximum UV Index (UVI) for Mastic Beach 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 Mastic Beach typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Mastic Beach 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 Mastic Beach Compares to Other Months

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

This table compares monthly weather conditions in Mastic Beach, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)81 mm (3.2 inches)84%moderate
February Weather3°C (38°F)107 mm (4.2 inches)82%moderate
March Weather5°C (41°F)106 mm (4.2 inches)81%high
April Weather9°C (48°F)122 mm (4.8 inches)78%very high
May Weather14°C (57°F)117 mm (4.6 inches)69%very high
June Weather19°C (67°F)68 mm (2.7 inches)69%very high
July Weather24°C (75°F)100 mm (3.9 inches)62%very high
August Weather24°C (75°F)98 mm (3.8 inches)65%very high
September Weather21°C (70°F)87 mm (3.4 inches)68%very high
October Weather16°C (62°F)139 mm (5.5 inches)74%high
November Weather10°C (50°F)102 mm (4.0 inches)82%moderate
December Weather5°C (42°F)134 mm (5.3 inches)80%low

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