January weather forecast
Umatac, GU

Weather in January

January, like December, in Umatac, Guam, is a moderately hot winter month, with an average temperature varying between 82°F (27.8°C) and 80.6°F (27°C).

Temperature

In Umatac, the average high-temperature in January is practically the same as in December - a still moderately hot 82°F (27.8°C). The average low-temperature, in January, is 80.6°F (27°C).

Heat index

The average heat index in January is calculated to be a tropical 87.8°F (31°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. 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', 'real feel', 'feels like', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, pregnancy, metabolic differences), and activity. 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 particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

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

Rainfall

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

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 6:05 pm. On the last day of January, in Umatac, Guam, sunrise is at 6:48 am and sunset at 6:21 pm ChST.

Sunshine

In Umatac, 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 value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 7 in January interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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.
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FAQ

What is the temperature in January in Umatac?

The average high-temperature, in January, in Umatac, is 82°F (27.8°C), while the average low-temperature is 80.6°F (27°C). in January, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 87.8°F (31°C).

What is the most humid month in Umatac?

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

What is the average humidity in January in Umatac?

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

How much does it rain in Umatac in January?

In Umatac, Guam, in January, it is raining for 21.3 days, with typically 2.83" (72mm) of accumulated precipitation.

How many hours of daylight does Umatac have in January?

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

What time are sunrise and sunset in January in Umatac?

In January, on the first day of the month, 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.

How many hours of sunshine does Umatac have in January?

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

What are the months with the highest UV index in Umatac?

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

What is the UV index reading in January in Umatac?

In Umatac, Guam, the average daily maximum UV index in January is 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Umatac, GU

Average temperature in January - Umatac, 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
Umatac, GU

Average pressure in January - Umatac, 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
Umatac, GU

Average wind speed in January - Umatac, 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
Umatac, GU

Average humidity in January - Umatac, 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
Umatac, GU

Average rainfall in January - Umatac, 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
Umatac, GU

Average rainfall days in January - Umatac, 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 daylight in January /
Average sunshine in January
Umatac, GU

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

The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 22min).

  • 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
Umatac, GU

Average sunshine days in January - Umatac, 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
Umatac, GU

Average UV index in January - Umatac, 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
Umatac, GU

Average cloud cover in January - Umatac, 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
Umatac, GU

Average visibility in January - Umatac, 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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