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
Port Isabel's coldest month, January, generally records average temperatures ranging from a high of 67.1°F (19.5°C) to a low of 59.5°F (15.3°C).Humidity
In January, the average relative humidity is 75%.Rainfall
In Port Isabel, during January, the rain falls for 12.3 days and regularly aggregates up to 1.57" (40mm) of precipitation. Throughout the year, there are 143.2 rainfall days, and 21.38" (543mm) of precipitation is accumulated.Ocean temperature
In Port Isabel, in January, the average water temperature is 68°F (20°C).Note: Most people do not enjoy swimming in water that is 68°F (20°C). Breathing becomes increasingly challenging as the water temperature dips under 69.8°F (21°C).
Daylight
The average length of the day in January is 10h and 44min.On the first day of January in Port Isabel, sunrise is at 7:16 am and sunset at 5:48 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 6:11 pm CST.
Sunshine
In January, the average sunshine in Port Isabel is 6.1h.UV index
January, February and December, with an average maximum UV index of 5, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 5 in January converts into the following recommendations:
Exercise prevention - Warding off sunburn is urged. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
What is the usual temperature for Port Isabel in January?
What is the average humidity in January?
How much does it rain in January?
How cold is the water in January?
How many hours of daylight does Port Isabel have in January?
What time are sunrise and sunset in January?
How long on average sun shines in January?
What is the month with the lowest UV index?
What is the UV index reading in January?
Average temperature in January
Port Isabel, TX
- Average high temperature in January: 67.1°F
The warmest month (with the highest average high temperature) is August (88°F).
The month with the lowest average high temperature is January (67.1°F).
- Average low temperature in January: 59.5°F
The month with the highest average low temperature is August (82°F).
The coldest month (with the lowest average low temperature) is January (59.5°F).
Average pressure in January
Port Isabel, TX
- Average pressure in January: 30.11"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are May and June (29.88"Hg).
Average wind speed in January
Port Isabel, TX
- Average wind speed in January: 13.4mph
The windiest month (with the highest average wind speed) is April (14.2mph).
The calmest month (with the lowest average wind speed) is September (10.9mph).
Average humidity in January
Port Isabel, TX
- Average humidity in January: 75%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (72%).
Average rainfall in January
Port Isabel, TX
- Average rainfall in January: 1.57"
The wettest month (with the highest rainfall) is September (4.13").
The driest month (with the least rainfall) is April (0.51").
Average rainfall days in January
Port Isabel, TX
- Average rainfall days in January: 12.3 days
The month with the highest number of rainy days is September (19.8 days).
The month with the least rainy days is March (8.2 days).
Average sea temperature in January
Port Isabel, TX
- Average sea temperature in January: 68°F
The best month for swimming (with the highest average sea temperature) is August (85.1°F).
The coldest month (with the lowest average sea temperature) is February (66.7°F).
Average daylight in January /
Average sunshine in January
Port Isabel, TX
- Average daylight in January: 10h and 4min
The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in January: 6h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days in January
Port Isabel, TX
- Average sunshine days in January: 16 days
The month with the most sunshine days is March (20.7 days).
The month with the least sunshine days is September (7.2 days).
Average UV index in January
Port Isabel, TX
- Average UV index in January: 5
The months with the highest UV index are April, May, June, July, August and September (UV index 7).
The months with the lowest UV index are January, February and December (UV index 5).
Average cloud cover in January
Port Isabel, TX
- Average cloud cover in January: 44
The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in January
Port Isabel, TX
- 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).
Port Isabel, Texas, USA
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