January weather forecast
Piti, GU

Weather in Piti, Guam, begins the new year with moderate high temperatures. Minor variations in weather are noticeable from December, mainly a slight rise in temperature and less rainfall. Relatively, January is a tad cooler than February, which brings about a subtle shift in climates. Piti's January weather manifests itself through a gentle touch of sunlight and gentle sea breezes, which add to the charm of the island city. The average wind speed in January, significantly reaching 15.8mph (25.4km/h), complements the balmy weather.

Temperature

The transition into January shows a subtle variation to a still moderately hot 82°F (27.8°C) from December's 83.5°F (28.6°C) in the average high-temperature. Piti documents an average low-temperature of 80.6°F (27°C) for the nights of January.

Heat index

The heat index for January is computed to be a tropical 87.8°F (31°C). If one stays active during extended exposure, it might induce fatigue and result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.

Humidity

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

Rainfall

In Piti, Guam, in January, during 21.3 rainfall days, 2.83" (72mm) of precipitation is typically accumulated. Throughout the year, in Piti, there are 288.5 rainfall days, and 60.08" (1526mm) of precipitation is accumulated.

Ocean temperature

In Piti, in January, the average water temperature is 82.9°F (28.3°C).
Note: Water activities including swimming and diving at temperatures from 77°F (25°C) to 84.2°F (29°C) are deemed very pleasurable and enjoyable for extended periods, devoid of discomfort.

Daylight

The average length of the day in January in Piti is 11h and 26min.
On the first day of the month, sunrise is at 6:43 am and sunset at 6:04 pm. On the last day of January, in Piti, Guam, sunrise is at 6:48 am and sunset at 6:20 pm ChST.

Sunshine

In Piti, 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 hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 7 in January translates into these instructions:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Note! Reflective surfaces like sand and water heighten the UV radiation levels.