Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average sea temperature in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
January is the coldest month, with the temperature often reaching an average high of 79.9°F (26.6°C) and an average low of 71.4°F (21.9°C).Humidity
The average relative humidity in January is 80%.Rainfall
In Arroyo, during January, the rain falls for 16.8 days and regularly aggregates up to 1.22" (31mm) of precipitation. Throughout the year, 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: For any water activity, the surface water temperatures in the range of 77°F (25°C) to 84.2°F (29°C) are deemed excellent and incredibly pleasant for longer durations.
Daylight
The average length of the day in January in Arroyo is 11h and 11min.On the first day of January, sunrise is at 6:55 am and sunset at 5:59 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:18 pm AST.
Sunshine
In Arroyo, the average sunshine in January is 8.8h.UV index
January through April, November and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In January, the maximum UV index of 6 suggests this advice:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Caution! Sand and water reflections can notably increase the UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest?
What are January temperatures?
What is the average humidity in January?
How many days does it rain in January?
How warm is the water in January?
How many hours of daylight does Arroyo have in January?
When is the sunrise / sunset in January?
How many hours of sunshine does Arroyo have in January?
What are the months with the lowest UV index in Arroyo?
How high is the UV index in January?
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).
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).
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).
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%).
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").
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).
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).
Average daylight in January /
Average sunshine in January
Arroyo, PR
- Average daylight in January: 11h and 1min
The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 6min).
- Average sunshine in January: 8h and 5min
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).
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).
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).
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).
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).
Arroyo, Puerto Rico, USA
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