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January Weather in Grand Isle, United States

Last updated: June 24, 2025

In January, the average temperature in Grand Isle, United States hovers around -11°C (13°F). Expect extremes, with a minimum plunge to -32°C (-24°F) and a maximum reaching up to 9°C (49°F). This month sees about 89 mm (3.5 in) of precipitation spread over 9 days, contributing to an average humidity of a brisk 93%. Be prepared for the chill!

January Temperature in Grand Isle

In January in Grand Isle, the average temperature is -11°C (13°F), with maximums reaching 9°C (49°F) and minimums plummeting to -32°C (-24°F). Travelers should be prepared for extreme cold and fluctuating temperatures during this time.

January Weather in Grand Isle: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Grand Isle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grand Isle, January typically has an average temperature of -11°C (13°F), with highs reaching up to 9°C (49°F) and lows dropping to around -32°C (-24°F).
JanFebMarAprMayJunJulAugSepOctNovDec131524375060666455443018
Data source: Temperature data for Grand Isle 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 Grand Isle

In Grand Isle in January, the precipitation amount is 89 mm (3.5 in) during a span of 9 days.

January Precipitation Trends in Grand Isle

The chart displays monthly precipitation patterns in Grand Isle, 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 Grand Isle, January typically receives around 89 mm (3.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec89747711997929384100121119102
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Grand Isle

In Grand Isle in January, humidity is 93%. With an average temperature of -11°C (13°F), this humidity feels like an icy blanket wrapping around you, making travel feel both challenging and invigorating as you navigate the frosty air that clings to your skin.

January Average Humidity in Grand Isle

This chart illustrates the average monthly humidity levels in Grand Isle, 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 Grand Isle is approximately 93%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%90%87%82%77%82%83%85%87%88%90%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Grand Isle

In Grand Isle in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Grand Isle, you can visit Hourly UV Index in Grand Isle.

Maximum UV Index Levels in Grand Isle for January

The chart shows the monthly maximum UV Index (UVI) for Grand Isle 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 Grand Isle typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2357810887432
Data source: Grand Isle 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 Grand Isle Compares to Other Months

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

This table compares monthly weather conditions in Grand Isle, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (13°F)89 mm (3.5 inches)93%low
February Weather-9°C (15°F)74 mm (2.9 inches)92%moderate
March Weather-5°C (24°F)77 mm (3.0 inches)90%moderate
April Weather3°C (37°F)119 mm (4.7 inches)87%high
May Weather10°C (51°F)97 mm (3.8 inches)82%very high
June Weather15°C (60°F)92 mm (3.6 inches)77%very high
July Weather19°C (66°F)93 mm (3.7 inches)81%very high
August Weather18°C (65°F)84 mm (3.3 inches)83%very high
September Weather13°C (56°F)100 mm (3.9 inches)85%high
October Weather7°C (45°F)121 mm (4.7 inches)87%moderate
November Weather-1°C (31°F)119 mm (4.7 inches)87%moderate
December Weather-8°C (18°F)102 mm (4.0 inches)90%low

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