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, noted for its average high-temperature of 81°F (27.2°C) and an average low-temperature of 71.2°F (21.8°C), is considered the coldest month.Heat index
For January, the heat index is computed to be a hot 86°F (30°C). If one stays active during extended exposure, it might induce fatigue and result in heat cramps.When assessing, remember that heat index measurements are for light winds and shaded spots. 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' or 'apparent temperature', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
Humidity
The average relative humidity in January is 79%.Rainfall
In Juana Díaz, Puerto Rico, in January, it is raining for 16.2 days, with typically 0.91" (23mm) of accumulated precipitation. In Juana Díaz, during the entire year, the rain falls for 249.1 days and collects up to 28.82" (732mm) of precipitation.Ocean temperature
In Juana Díaz, Puerto Rico, in January, the average water temperature is 80.1°F (26.7°C).Note: For any water activity, surface water temperatures from 77°F (25°C) to 84.2°F (29°C) are deemed perfect and extremely pleasing for enduring enjoyment.
Daylight
The average length of the day in January is 11h and 11min.On the first day of January, sunrise is at 6:57 am and sunset at 6:01 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:19 pm AST.
Sunshine
In Juana Díaz, the average sunshine in January is 9.1h.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 reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the average person.Note: In January, a daily maximum UV index of 6 leads to the following instructions:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. Stay sun-safe with clothing that is both closely woven and worn loosely. Stay cautious! Sand and water reflections increase UV radiation potency.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest?
What is the temperature in January?
What is the average humidity in January?
How much does it rain in January?
What is the water temperature in January?
What is the average length of the day in January?
What time are sunrise and sunset in January?
How long on average sun shines in January?
When is the lowest UV index?
What is the UV index reading in January in Juana Díaz?
Average temperature in January
Juana Díaz, PR
- Average high temperature in January: 81°F
The warmest month (with the highest average high temperature) is August (86.5°F).
The month with the lowest average high temperature is January (81°F).
- Average low temperature in January: 71.2°F
The month with the highest average low temperature is August (76.6°F).
The coldest months (with the lowest average low temperature) are February and March (70.9°F).
Average pressure in January
Juana Díaz, PR
- Average pressure in January: 30.01"Hg
The months with the highest atmospheric pressure are January and February (30.01"Hg).
The months with the lowest atmospheric pressure are October and November (29.9"Hg).
Average wind speed in January
Juana Díaz, PR
- Average wind speed in January: 7mph
The windiest month (with the highest average wind speed) is July (8mph).
The calmest month (with the lowest average wind speed) is November (5.5mph).
Average humidity in January
Juana Díaz, PR
- Average humidity in January: 79%
The month with the highest relative humidity is November (81%).
The month with the lowest relative humidity is March (76%).
Average rainfall in January
Juana Díaz, PR
- Average rainfall in January: 0.91"
The wettest month (with the highest rainfall) is September (4.45").
The driest month (with the least rainfall) is February (0.83").
Average rainfall days in January
Juana Díaz, PR
- Average rainfall days in January: 16.2 days
The month with the highest number of rainy days is October (24.8 days).
The month with the least rainy days is February (15 days).
Average sea temperature in January
Juana Díaz, PR
- Average sea temperature in January: 80.1°F
The best month for swimming (with the highest average sea temperature) is September (85.3°F).
The coldest month (with the lowest average sea temperature) is March (79.3°F).
Average daylight in January /
Average sunshine in January
Juana Díaz, 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: 9h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 54min).
The month with the least sunshine is November (Average sunshine: 6h and 54min).
Average sunshine days in January
Juana Díaz, PR
- Average sunshine days in January: 7.4 days
The month with the most sunshine days is March (7.6 days).
The month with the least sunshine days is October (2.6 days).
Average UV index in January
Juana Díaz, 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
Juana Díaz, PR
- Average cloud cover in January: 27
The month with the most cloud cover is May (Cloud cover 34).
The month with the least cloud cover is February (Cloud cover 25).
Average visibility in January
Juana Díaz, 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).
Juana Díaz, Puerto Rico, USA
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