January weather forecast
Dededo, GU

Weather in January

January, the same as December, is a moderately hot winter month in Dededo, Guam, with an average temperature fluctuating between 82°F (27.8°C) and 80.6°F (27°C).

Temperature

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

Heat index

The average heat index in January is estimated at a tropical 88.3°F (31.3°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. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'real feel', or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like differences in body mass, height, and shape, clothing, pregnancy, and activity influence one's weather impression. 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. 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

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

Rainfall

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

Daylight

In Dededo, the average length of the day in January is 11h and 26min.
On the first day of January in Dededo, sunrise is at 6:43 am and sunset at 6:04 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:20 pm ChST.

Sunshine

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

UV index

The months with the highest UV index in Dededo 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 health risk from exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 7 in January interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in January in Dededo?

In January, the average high-temperature is 82°F (27.8°C), and the average low-temperature is 80.6°F (27°C). The average heat index (a.k.a. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in January is estimated at 88.3°F (31.3°C).

What is the most humid month in Dededo?

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

What is the average humidity in January in Dededo?

In January, the average relative humidity is 78%.

How many days does it rain in January in Dededo?

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

What is the average length of the day in January in Dededo?

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

When is the sunrise / sunset in January in Dededo?

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 Dededo, Guam, sunrise is at 6:47 am and sunset at 6:20 pm ChST.

How long on average sun shines in January in Dededo?

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

When is the highest UV index in Dededo?

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

What is the UV index intensity in January in Dededo?

The average daily maximum UV index in January is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe 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
Dededo, GU

Average temperature in January - Dededo, 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
Dededo, GU

Average pressure in January - Dededo, 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
Dededo, GU

Average wind speed in January - Dededo, 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
Dededo, GU

Average humidity in January - Dededo, 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
Dededo, GU

Average rainfall in January - Dededo, 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
Dededo, GU

Average rainfall days in January - Dededo, 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
Dededo, GU

Average daylight in January / Average sunshine in January - Dededo, 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
Dededo, GU

Average sunshine days in January - Dededo, 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
Dededo, GU

Average UV index in January - Dededo, 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
Dededo, GU

Average cloud cover in January - Dededo, 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
Dededo, GU

Average visibility in January - Dededo, 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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