January weather forecast
Arroyo, PR

Weather in January

January, like December, in Arroyo, Puerto Rico, is another warm winter month, with an average temperature fluctuating between 79.9°F (26.6°C) and 71.4°F (21.9°C).

Temperature

The coldest month is January, with an average high-temperature of 79.9°F (26.6°C) and an average low-temperature of 71.4°F (21.9°C).

Humidity

The average relative humidity in January is 80%.

Rainfall

In Arroyo, Puerto Rico, in January, it is raining for 16.8 days, with typically 1.22" (31mm) of accumulated precipitation. Throughout the year, in Arroyo, Puerto Rico, there are 255.3 rainfall days, and 29.41" (747mm) of precipitation is accumulated.

Ocean temperature

In Arroyo, in January, the average water temperature is 80.2°F (26.8°C).
Note: 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.

Daylight

The average length of the day in January is 11h and 11min.
On the first day of the month, sunrise is at 6:55 am and sunset at 6:00 pm. On the last day of January, sunrise is at 6:57 am and sunset at 6:18 pm AST.

Sunshine

In January, the average sunshine is 8.8h.

UV index

The months with the lowest UV index in Arroyo, Puerto Rico, are January through April, November and December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The average daily UV index of 6 in January transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Arroyo?

With an average high-temperature of 79.9°F (26.6°C) and an average low-temperature of 71.4°F (21.9°C), January is the coldest month.

What is the average humidity in January in Arroyo?

The average relative humidity in January in Arroyo, Puerto Rico, is 80%.

How many days does it rain in January in Arroyo?

In Arroyo, Puerto Rico, in January, during 16.8 rainfall days, 1.22" (31mm) of precipitation is typically accumulated.

How warm is the water in January in Arroyo?

In Arroyo, the average seawater temperature in January is 80.2°F (26.8°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 Arroyo have in January?

The average day length in January in Arroyo is 11h and 11min.

When are sunrise and sunset in January in Arroyo?

On the first day of January in Arroyo, Puerto Rico, sunrise is at 6:55 am and sunset at 6:00 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:18 pm AST.

How many hours of sunshine does Arroyo have in January?

The average sunshine duration in January in Arroyo is 8.8h.

When is the lowest UV index in Arroyo?

The months with the lowest UV index in Arroyo are January through April, November and December, with an average maximum UV index of 6.

What is the UV index intensity in January in Arroyo?

The average daily maximum UV index in January in Arroyo is 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation.

Average temperature in January
Arroyo, PR

Average temperature in January - Arroyo, PR
  • Average high temperature in January: 79.9°F

The warmest month (with the highest average high temperature) is August (85.3°F).
The month with the lowest average high temperature is January (79.9°F).

  • Average low temperature in January: 71.4°F

The months with the highest average low temperature are July and August (76.6°F).
The coldest month (with the lowest average low temperature) is January (71.4°F).

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Average pressure in January
Arroyo, PR

Average pressure in January - Arroyo, PR
  • Average pressure in January: 30.01"Hg

The months with the highest atmospheric pressure are January and February (30.01"Hg).
The month with the lowest atmospheric pressure is October (29.9"Hg).

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Average wind speed in January
Arroyo, PR

Average wind speed in January - Arroyo, PR
  • Average wind speed in January: 7.7mph

The windiest month (with the highest average wind speed) is July (8.6mph).
The calmest month (with the lowest average wind speed) is October (6mph).

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Average humidity in January
Arroyo, PR

Average humidity in January - Arroyo, PR
  • Average humidity in January: 80%

The month with the highest relative humidity is November (82%).
The month with the lowest relative humidity is March (77%).

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Average rainfall in January
Arroyo, PR

Average rainfall in January - Arroyo, PR
  • Average rainfall in January: 1.22"

The wettest month (with the highest rainfall) is September (4.29").
The driest month (with the least rainfall) is February (1.02").

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Average rainfall days in January
Arroyo, PR

Average rainfall days in January - Arroyo, PR
  • Average rainfall days in January: 16.8 days

The months with the highest number of rainy days are May and October (25.3 days).
The month with the least rainy days is February (15.4 days).

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Average sea temperature in January
Arroyo, PR

Average sea temperature in January - Arroyo, PR
  • Average sea temperature in January: 80.3°F

The best month for swimming (with the highest average sea temperature) is September (85.4°F).
The coldest months (with the lowest average sea temperature) are February and March (79.3°F).

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Average daylight in January /
Average sunshine in January
Arroyo, PR

Average daylight in January / Average sunshine in January - Arroyo, PR
  • Average daylight in January: 11h and 11min

The month with the longest days is June (Average daylight: 13h and 11min).
The month with the shortest days is December (Average daylight: 11h and 4min).

  • Average sunshine in January: 8h and 48min

The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).

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Average sunshine days in January
Arroyo, PR

Average sunshine days in January - Arroyo, PR
  • Average sunshine days in January: 8.8 days

The month with the most sunshine days is January (8.8 days).
The month with the least sunshine days is May (2.7 days).

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Average UV index in January
Arroyo, PR

Average UV index in January - Arroyo, PR
  • Average UV index in January: 6

The months with the highest UV index are May, June, July, August, September and October (UV index 7).
The months with the lowest UV index are January, February, March, April, November and December (UV index 6).

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Average cloud cover in January
Arroyo, PR

Average cloud cover in January - Arroyo, PR
  • Average cloud cover in January: 34

The months with the most cloud cover are May and July (Cloud cover 40).
The month with the least cloud cover is February (Cloud cover 31).

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Average visibility in January
Arroyo, PR

Average visibility in January - Arroyo, PR
  • 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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