January weather forecast
Umatac, GU

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Weather in January

January in Umatac, Guam, ushers in the new year accompanied by warm temperatures, slight humidity, and moderate rainfall. In comparison to February, January records notably higher rainfall at 2.83" (72mm) and wind speeds of 15.8mph (25.4km/h). The amiable weather paves the way for outdoor activities enjoying the fairly abundant sunlight. Mild winds stir the tropical atmosphere, further enhancing the pleasant conditions. The UV index of 7 demands attention to sun protection, especially during midday hours when UV radiation is most intense.

Temperature

With the advent of January, Umatac experiences an average high-temperature of a still warm 82°F (27.8°C), mirroring a close resemblance to the previous month. January nights witness a mild cool down to an average low of 80.6°F (27°C).

Heat index

January's average heat index is estimated at a hot 87.8°F (31°C). Long-standing exposure coupled with ongoing activity could result in exhaustion, possibly causing heat cramps.
In terms of the heat index, values are set with light wind and shade conditions in mind. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', integrates the air's temperature and its humidity to showcase the felt temperature by people. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.

Humidity

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

Rainfall

In Umatac, during January, the rain falls for 21.3 days and regularly aggregates up to 2.83" (72mm) of precipitation. In Umatac, during the entire year, the rain falls for 288.5 days and collects up to 60.08" (1526mm) of precipitation.

Daylight

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

Sunshine

In January, the average sunshine is 7.6h.

UV index

January through August, October through December, with an average maximum UV index of 7, are months with the highest UV index. 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: In January, the maximum UV index of 7 suggests these recommendations:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.

Frequently asked questions

What is the temperature in January?

The high-temperature, in January, in Umatac, records 82°F (27.8°C), while the low-temperature is 80.6°F (27°C). In January, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is estimated at 87.8°F (31°C).

What is the most humid month?

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

What is the average humidity in January?

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

How much does it rain in January?

In January, the rain falls for 21.3 days. Throughout January, 2.83" (72mm) of precipitation is accumulated.

How many hours of daylight does Umatac have in January?

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

When is the sunrise / sunset in January?

On the first day of January, 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?

The average sunshine duration in January is 7.6h.

What is the month with the highest UV index?

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

How high is the UV index in January?

In Umatac, the average daily maximum UV index in January is 7. A UV Index value of 6 to 7 symbolizes a high hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
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).

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).

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).

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%).

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").

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).

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 2min

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 24min).

  • Average sunshine in January: 7h and 4min

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).

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).

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).

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).

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).

Umatac, Guam, USA

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