January weather forecast
Guam, USA

January in Guam marks the beginning of the dry season, transitioning from the wetter end-of-year months. Temperatures during this month typically lie between 75°F (23.9°C) and 84°F (28.9°C). Compared to December, which experiences slightly more rainfall and marginally cooler temperatures, January offers a warmer and drier environment. While Guam, being a relatively small island, does not have notable weather variations between cities, the entire region enjoys the consistent climate.

Interestingly, January and February jointly claim the title of being the coldest months of the year for Guam. Yet, the term "cold" is relative as the temperatures are still quite pleasant by most standards. Rainfall is significantly reduced from the wetter months preceding it, making January one of the best months for outdoor activities and exploration.

The northeast trade winds persist during this time, moderating temperatures and keeping the conditions comfortable. These winds, blowing at speeds from 10mph (16.1km/h) to 20mph (32.2km/h), also play a role in reducing the chance of rain. Ocean temperatures, slightly cooler than the land, provide a refreshing contrast and are inviting for swimmers and divers. In comparison, February maintains a similar climate pattern, but with a tad lower temperatures, making January slightly warmer.

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• Hagåtña - January »
  The months with the highest humidity in Hagåtña are January, March through May, October through December, with an average relative humidity of 78%. January, March through May, October through December, with an average relative humidity of 78%, are most humid months in Hagåtña.
• Dededo - January »
  The months with the highest humidity in Dededo are January, March through May, October through December, with an average relative humidity of 78%. January through August, October through December, with an average maximum UV index of 7, are months with the highest UV index in Dededo.
• Santa Rita - January »
  The months with the highest humidity in Santa Rita are January, March through May, October through December, with an average relative humidity of 78%. January, March through May, October through December, with an average relative humidity of 78%, are most humid months in Santa Rita.
• Agat - January »
  The months with the highest humidity in Agat are January, March through May, October through December, with an average relative humidity of 78%. January, March through May, October through December, with an average relative humidity of 78%, are most humid months in Agat.
• Piti - January »
  The months with the highest humidity in Piti are January, March through May, October through December, with an average relative humidity of 78%. On the last day of January, in Piti sunrise is at 6:48 am and sunset at 6:20 pm ChST.
• Talofofo - January »
  January, March through May, October through December, with an average relative humidity of 78%, are the most humid months in Talofofo. January in Talofofo, Guam, USA brings in the new year with relatively moderate conditions, with weather largely unchanged from the previous month.
• Inarajan - January »
  The months with the highest UV index in Inarajan are January through August, October through December, with an average maximum UV index of 7. In Inarajan, in January, the average water temperature is 82.9°F (28.3°C).
• Merizo - January »
  The months with the highest humidity in Merizo are January, March through May, October through December, with an average relative humidity of 78%. January in Merizo typically exhibits a tropical maritime climate, with constant high humidity and temperature.
• Umatac - January »
  January, March through May, October through December, with an average relative humidity of 78%, are most humid months in Umatac, Guam. January, March through May, October through December, with an average relative humidity of 78%, are the most humid months in Umatac, Guam.
• Guam National Wildlife Refuge - January »
  On the last day of January, in Guam National Wildlife Refuge, sunrise is at 6:47 am and sunset at 6:19 pm ChST. On the first day of January in Guam National Wildlife Refuge, sunrise is at 6:43 am and sunset at 6:03 pm.