January weather forecast
Merizo, GU

January in Merizo, Guam, typically exhibits a tropical maritime climate, with constant high humidity and temperature. The month experiences weather conditions that are consistent with the rainy season. It introduces the calendar year with a relatively wet climate, with ample rainfall recorded at 2.83" (72mm). Furthermore, gusty winds mark the weather landscape, contributing to an overall moderate visibility. The start of the year ushers in a relatively cool sea, presenting engaging conditions for water sports.

Temperature

Merizo, Guam, measures an average high-temperature of a still warm 82°F (27.8°C) in January, nearly consistent with the preceding month. In Merizo, the January nights are characterized by an average low-temperature of 80.6°F (27°C), a minor dip from daytime readings.

Heat index

In January, the heat index is evaluated at a tropical 87.8°F (31°C). If one continues to be active during exposure, it might cause tiredness and subsequent heat cramps.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.

Humidity

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

Rainfall

In Merizo, in January, during 21.3 rainfall days, 2.83" (72mm) of precipitation is typically accumulated. In Merizo, during the entire year, the rain falls for 288.5 days and collects up to 60.08" (1526mm) of precipitation.

Ocean temperature

In Merizo, in January, the average water temperature is 82.9°F (28.3°C).
Note: For swimming, diving, and various water activities, the temperatures ranging from 77°F (25°C) to 84.2°F (29°C) are seen as highly enjoyable and comfortable for extended durations without any discomfort.

Daylight

In January, the average length of the day is 11h and 26min.
On the first day of the month, sunrise is at 6:43 am and sunset at 6:05 pm. On the last day of January, sunrise is at 6:47 am and sunset at 6:21 pm ChST.

Sunshine

In Merizo, 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 threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In January, the UV index of 7 transforms into the following advice:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Notice! Sand and water reflections contribute to a stronger UV exposure.