January weather forecast
Hagåtña, GU

Weather in January

January, the same as December, is another warm winter month in Hagåtña, Guam, with temperature in the range of an average high of 82°F (27.8°C) and an average low of 80.6°F (27°C).

Temperature

In January, the average high-temperature is almost the same as in December - a still warm 82°F (27.8°C). The average low-temperature, in Hagåtña, is 80.6°F (27°C).

Heat index

In January, the average heat index is appraised at a hot 87.8°F (31°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, pregnancy, wind, and differences in body mass, height, and shape affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

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

Rainfall

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

Ocean temperature

In Hagåtña, the average seawater temperature in January is 82.9°F (28.3°C).
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In Hagåtña, Guam, 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 6:47 am and sunset at 6:20 pm ChST.

Sunshine

In January, the average sunshine is 7.6h.

UV index

The months with the highest UV index in Hagåtña are January through August, October through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the average person.
Note: In January, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in January in Hagåtña?

In Hagåtña, in January, the average high-temperature is 82°F (27.8°C), and the average low-temperature is 80.6°F (27°C). in January, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is appraised at 87.8°F (31°C).

What is the most humid month in Hagåtña?

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

What is the average humidity in January in Hagåtña?

In January, the average relative humidity in Hagåtña is 78%.

How many days does it rain in January in Hagåtña?

In Hagåtña, Guam, in January, during 21.3 rainfall days, 2.83" (72mm) of precipitation is typically accumulated.

What is the water temperature in January in Hagåtña?

In January, the average ocean temperature is 82.9°F (28.3°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Hagåtña have in January?

In January, the average day length is 11h and 26min.

When is the sunrise / sunset in January in Hagåtña?

In January, on the first day of the month, sunrise is at 6:43 am and sunset at 6:04 pm. On the last day of the month, in Hagåtña, sunrise is at 6:47 am and sunset at 6:20 pm ChST.

How many hours of sunshine does Hagåtña have in January?

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

What is the month with the highest UV index in Hagåtña?

January through August, October through December, with an average maximum UV index of 7, are months with the highest UV index.

What is the UV index intensity in January in Hagåtña?

The average daily maximum UV index in January is 7. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to UV radiation.

Average temperature in January
Hagåtña, GU

Average temperature in January - Hagåtña, GU
  • Average high temperature in January: 82°F

The warmest months (with the highest average high temperature) are July and August (84.7°F).
The month with the lowest average high temperature is February (81.7°F).

  • Average low temperature in January: 80.6°F

The month with the highest average low temperature is June (83.3°F).
The coldest month (with the lowest average low temperature) is February (79.7°F).

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Average pressure in January
Hagåtña, GU

Average pressure in January - Hagåtña, GU
  • Average pressure in January: 29.86"Hg

The month with the highest atmospheric pressure is February (29.88"Hg).
The months with the lowest atmospheric pressure are August, September and October (29.79"Hg).

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Average wind speed in January
Hagåtña, GU

Average wind speed in January - Hagåtña, GU
  • Average wind speed in January: 15.8mph

The windiest month (with the highest average wind speed) is February (16.3mph).
The calmest month (with the lowest average wind speed) is August (9.6mph).

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Average humidity in January
Hagåtña, GU

Average humidity in January - Hagåtña, GU
  • Average humidity in January: 78%

The months with the highest relative humidity are January, March, April, May, October, November and December (78%).
The month with the lowest relative humidity is August (76%).

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Average rainfall in January
Hagåtña, GU

Average rainfall in January - Hagåtña, GU
  • Average rainfall in January: 2.83"

The wettest month (with the highest rainfall) is September (10.28").
The driest month (with the least rainfall) is March (1.81").

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Average rainfall days in January
Hagåtña, GU

Average rainfall days in January - Hagåtña, GU
  • Average rainfall days in January: 21.3 days

The months with the highest number of rainy days are July and August (28.9 days).
The month with the least rainy days is February (17.5 days).

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Average sea temperature in January
Hagåtña, GU

Average sea temperature in January - Hagåtña, GU
  • Average sea temperature in January: 82.9°F

The best month for swimming (with the highest average sea temperature) is August (85.4°F).
The coldest month (with the lowest average sea temperature) is February (82°F).

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Average daylight in January /
Average sunshine in January
Hagåtña, GU

Average daylight in January / Average sunshine in January - Hagåtña, GU
  • Average daylight in January: 11h and 26min

The month with the longest days is June (Average daylight: 12h and 55min).
The month with the shortest days is December (Average daylight: 11h and 21min).

  • Average sunshine in January: 7h and 36min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is November (Average sunshine: 6h and 18min).

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Average sunshine days in January
Hagåtña, GU

Average sunshine days in January - Hagåtña, GU
  • Average sunshine days in January: 5.4 days

The month with the most sunshine days is March (6.6 days).
The month with the least sunshine days is September (1.1 days).

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Average UV index in January
Hagåtña, GU

Average UV index in January - Hagåtña, GU
  • Average UV index in January: 7

The months with the highest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 7).
The month with the lowest UV index is September (UV index 6).

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Average cloud cover in January
Hagåtña, GU

Average cloud cover in January - Hagåtña, GU
  • Average cloud cover in January: 46

The months with the most cloud cover are January, August and October (Cloud cover 46).
The months with the least cloud cover are May and June (Cloud cover 39).

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Average visibility in January
Hagåtña, GU

Average visibility in January - Hagåtña, GU
  • Average visibility in January: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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