January weather forecast
Inarajan, GU

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Weather in January

Weather conditions in Inarajan, Guam in January slowly transition from the relatively serene period seen in the earlier part of the winter season. The new year is greeted with a slight increase in rainfall to 2.83" (72mm) with 21.3 rainy days, making this month not so ideal for outdoor activities. However, coastal activities flourish with relatively warm sea temperatures, great for water sports and seaside relaxations. With 11.4 daylight hours and a UV index of 7, residents and tourists alike are advised to carry sun protection. Despite the prevalent rain, January hosts fairly generous sunlight hours reflecting the territory's tropical climate.

Temperature

January's presence records an average high-temperature of a still moderately hot 82°F (27.8°C), closely mirroring December's climate. In January, Inarajan's nighttime temperatures demonstrate a slight decrease, stabilizing at an average of 80.6°F (27°C).

Heat index

Throughout January, the heat index is evaluated at a tropical 87.8°F (31°C). Persisting in activity during exposure could lead to weariness and subsequently to heat cramps.
The metrics for the heat index are tailored for both shady environments and light winds. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'real feel', unifies temperature and humidity readings to offer a comprehensive feel of warmth. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.

Humidity

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

Rainfall

In Inarajan, in January, it is raining for 21.3 days, with typically 2.83" (72mm) of accumulated precipitation. Throughout the year, in Inarajan, there are 288.5 rainfall days, and 60.08" (1526mm) of precipitation is accumulated.

Ocean temperature

In Inarajan, the average seawater temperature in January is 82.9°F (28.3°C).
Note: Engaging in swimming, diving, or other water activities is highly enjoyable in temperatures ranging from 77°F (25°C) to 84.2°F (29°C), without any unpleasant sensations for prolonged durations.

Daylight

In Inarajan, the average length of the day in January 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 6:47 am and sunset at 6:20 pm ChST.

Sunshine

In January, the average sunshine in Inarajan 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 reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum daily UV index of 7 during January morphs into the following directions:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. 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. Beware! Reflecting off water and sand, UV rays are much stronger.

Frequently asked questions

What is the average January temperature in Inarajan?

In January, in Inarajan, 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. 'real feel', 'felt air temperature'), which combines relative humidity and air temperature, in January is evaluated at 87.8°F (31°C).

What are the most humid months in Inarajan?

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

What is the average humidity in January in Inarajan?

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

How many days does it rain in January in Inarajan?

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

How warm is the water in January in Inarajan?

In Inarajan, in January, the average water temperature is 82.9°F (28.3°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Inarajan have in January?

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

What time are sunrise and sunset in January in Inarajan?

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 6:47 am and sunset at 6:20 pm ChST.

How long on average sun shines in January in Inarajan?

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

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

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

What is the UV index intensity in January in Inarajan?

In Inarajan, Guam, the average daily maximum UV index in January is 7. A UV Index reading of 6 to 7 represents a high health threat from unprotected exposure to UV radiation.

Average temperature in January
Inarajan, GU

Average temperature in January - Inarajan, 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
Inarajan, GU

Average pressure in January - Inarajan, 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
Inarajan, GU

Average wind speed in January - Inarajan, 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
Inarajan, GU

Average humidity in January - Inarajan, 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
Inarajan, GU

Average rainfall in January - Inarajan, 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
Inarajan, GU

Average rainfall days in January - Inarajan, 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 sea temperature in January
Inarajan, GU

Average sea temperature in January - Inarajan, 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).

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

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

Average sunshine days in January - Inarajan, 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
Inarajan, GU

Average UV index in January - Inarajan, 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
Inarajan, GU

Average cloud cover in January - Inarajan, 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
Inarajan, GU

Average visibility in January - Inarajan, 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).

Inarajan, Guam, USA

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