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 start of January sees the average high-temperature at a still moderately hot 82°F (27.8°C), showing little difference from December's 83.5°F (28.6°C). Piti sees a minor drop to an average minimum temperature of 80.6°F (27°C) during the night in the month of January.

Heat index

In January, the heat index is appraised at a hot 87.8°F (31°C). Persisting in activity during long-term exposure might induce weariness, with subsequent heat cramps.
Understand that the heat index values take into account shaded locations and mild winds. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. 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

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

Rainfall

In Piti, in January, it is raining for 21.3 days, with typically 2.83" (72mm) of accumulated precipitation. Throughout the year, 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: Between the temperatures of 77°F (25°C) and 84.2°F (29°C), water is considered very warm, providing pleasure in water activities without discomfort over lengthy periods.

Daylight

The average length of the day in January 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, 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 in Piti are January through August, October through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The UV index of 7 during January leads to these advisories:
Inhibit overexposure. Warding off sun damage is of utmost importance. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Opt for tightly woven and loose clothing to enhance protection from the Sun. Attention! The combination of sand and water reflections enhances UV ray intensity.