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

Umatac's weather, upon January's arrival, documents an average high-temperature of a still warm 82°F (27.8°C), nearly identical to the prior month. During the nights of January, Umatac records an average low-temperature of 80.6°F (27°C), reflecting a modest decrease from daytime highs.

Heat index

For January, the heat index is computed to be a tropical 87.8°F (31°C). If one remains active during constant exposure, it might cause exhaustion and heat cramps.
Heat index details are generally centered around shaded locations and a mild breeze. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is the outcome of merging air's temperature and its humidity metrics. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.

Humidity

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

Rainfall

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

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, sunrise is at 6:48 am and sunset at 6:21 pm ChST.

Sunshine

In Umatac, the average sunshine in January 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 in Umatac. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 7 in January transforms into the following instructions:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
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Frequently asked questions

What is the usual temperature for Umatac 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). The average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, in January is computed to be 87.8°F (31°C).

What is the most humid month in Umatac?

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

What is the average humidity in January in Umatac?

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

How many days does it rain in January in Umatac?

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

How many hours of daylight does Umatac have in January?

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

When are sunrise and sunset in January in Umatac?

On the first day of January in Umatac, Guam, 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 in Umatac?

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

How high is the UV index in January in Umatac?

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

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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 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).

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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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Umatac, Guam, USA

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