January weather forecast
Agat, GU

Agat begins the year with mild tropical weather that offers comfortable conditions for outdoor activities. The month carries the least rainfall with only 2.83" (72mm), setting the tone for perfect beach visits or exploratory hikes. Compared to the rest of the year, it stays relatively dry fostering the growth of local flora. January still witnesses relative humidity that makes the town perfect for a vacation. As the town ushers into February, the weather pattern remains quite stable with temperatures, rainfall, and humidity showing minimal changes.

Temperature

Agat experiences an average high-temperature of a still moderately hot 82°F (27.8°C) in January, subtly different from December's 83.5°F (28.6°C). The nights of January in Agat, Guam, cool down to an average low of 80.6°F (27°C), subtly lower than daytime highs.

Heat index

January's heat index is calculated to be a hot 87.8°F (31°C). With ongoing exposure and activity, one might experience weariness, and heat cramps could ensue.
Heat index details are generally centered around shaded locations and a mild breeze. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', binds temperature metrics with humidity values to give a sense of the actual warmth. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.

Humidity

The months with the highest humidity in Agat are January, March through May, October through December, with an average relative humidity of 78%.

Rainfall

In January, the rain falls for 21.3 days. Throughout January, 2.83" (72mm) of precipitation is accumulated. Throughout the year, there are 288.5 rainfall days, and 60.08" (1526mm) of precipitation is accumulated.

Daylight

In January, the average length of the day in Agat is 11h and 26min.
On the first day of January in Agat, sunrise is at 6:43 am and sunset at 6:05 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:21 pm ChST.

Sunshine

In Agat, Guam, the average sunshine in January is 7.6h.

UV index

The months with the highest UV index are January through August, October through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum UV index, 7 during January, leads to the following recommendations:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.