Climate and monthly weather forecastPort Isabel, TX
Climate and monthly weather forecast
Weather in January
January, the same as December, is another enjoyable winter month in Port Isabel, Texas, with an average temperature varying between 67.1°F (19.5°C) and 59.5°F (15.3°C). 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). Weather in January »Weather in February
The last month of the winter, February, is a pleasant month in Port Isabel, Texas, with an average temperature ranging between min 62.2°F (16.8°C) and max 69.4°F (20.8°C). The average high-temperature in February, at an agreeable 69.4°F (20.8°C), reveals a modest deviation from January's 67.1°F (19.5°C). Weather in February »Weather in March
March, the first month of the spring in Port Isabel, is still a pleasant month, with an average temperature fluctuating between 66°F (18.9°C) and 73°F (22.8°C). As March takes hold, the average high-temperature is a still agreeable 73°F (22.8°C), nearly mirroring that of the previous month. Weather in March »Weather in April
April is a moderately hot spring month in Port Isabel, Texas, with an average temperature fluctuating between 71.2°F (21.8°C) and 77.7°F (25.4°C). Entering April, the average high-temperature is recorded at a warm 77.7°F (25.4°C), exhibiting a minimal shift from March's 73°F (22.8°C). Weather in April »Weather in May
The last month of the spring, May, is another warm month in Port Isabel, Texas, with an average temperature ranging between min 75.7°F (24.3°C) and max 81.9°F (27.7°C). In May, Port Isabel's weather conditions record an average high-temperature of a still moderately hot 81.9°F (27.7°C), demonstrating little divergence from the preceding month. Weather in May »Weather in June
June, the first month of the summer in Port Isabel, is still a warm month, with an average temperature varying between 85.8°F (29.9°C) and 80.1°F (26.7°C). Port Isabel marks the arrival of June with an average high-temperature of a still moderately hot 85.8°F (29.9°C), hardly different from May's 81.9°F (27.7°C). Weather in June »Weather in July
July in Port Isabel, Texas, is a tropical summer month, with an average temperature fluctuating between 86.9°F (30.5°C) and 81.1°F (27.3°C). The onset of July manifests an average high-temperature of a tropical 86.9°F (30.5°C), demonstrating a minor variation from the preceding month. Weather in July »Weather in August
August, the last month of the summer in Port Isabel, is also a hot month, with an average temperature ranging between max 88°F (31.1°C) and min 82°F (27.8°C). The warmest month is August, with an average high-temperature of 88°F (31.1°C) and an average low-temperature of 82°F (27.8°C). The heat index for August is evaluated at a sweltering 102.2°F (39°C). Weather in August »Weather in September
The first month of the autumn, September, is also a hot month in Port Isabel, Texas, with an average temperature ranging between max 86.2°F (30.1°C) and min 80.4°F (26.9°C). September's presence marks an average high-temperature of a still hot 86.2°F (30.1°C), subtly varied from August's 88°F (31.1°C). Weather in September »Weather in October
October, the same as September, is another warm autumn month in Port Isabel, Texas, with temperature in the range of an average low of 76.1°F (24.5°C) and an average high of 81.9°F (27.7°C). October's arrival shows an average high-temperature of a moderately hot 81.9°F (27.7°C), hardly different from the previous month. Weather in October »Weather in November
The last month of the autumn, November, is another warm month in Port Isabel, Texas, with an average temperature ranging between min 68.4°F (20.2°C) and max 74.7°F (23.7°C). The shift from October to November includes a small decrease in the average high-temperature, from a moderately hot 81.9°F (27.7°C) to a still warm 74.7°F (23.7°C). Weather in November »Weather in December
The first month of the winter, December, is also an agreeable month in Port Isabel, Texas, with temperature in the range of an average low of 63°F (17.2°C) and an average high of 69.6°F (20.9°C). The beginning of December reveals an average high-temperature of an agreeable 69.6°F (20.9°C), showing minimal deviation from the previous month. Weather in December »Updated: Jul 4, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January proves to be the coldest month, recording an average maximum temperature of 67.1°F (19.5°C) and a minimum temperature of 59.5°F (15.3°C).
Throughout the year, there are 143.2 rainfall days, and 21.38" (543mm) of precipitation is accumulated.
The months with the lowest UV index are January, February and December, with an average maximum UV index of 5.
The month with the coldest seawater is February, with an average ocean temperature of 66.7°F (19.3°C).
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
April is the month with the least rainfall. Rain falls for 8.8 days and accumulates 0.51" (13mm) of precipitation.
April through September, with an average maximum UV index of 7, are months with the highest UV index.
The most humid month is May, with an average relative humidity of 80%.
June has the longest days of the year, with an average of 13h and 42min of daylight.
The month with the most sunshine is July, with an average of 11.3h of sunshine.
The warmest period is August, when temperatures fluctuate between an average high of 88°F (31.1°C) and a low of 82°F (27.8°C).
August is the month with the warmest seawater, with an average ocean temperature of 85.1°F (29.5°C).
The month with the most rainfall is September, when the rain falls for 19.8 days and typically aggregates up to 4.13" (105mm) of precipitation.
October is the least humid month, with an average relative humidity of 72%.
December has the shortest days of the year, with an average of 10h and 30min of daylight.
December has the least sunshine of the year, with an average of 4.8h of sunshine.
Average temperature
Port Isabel, TX
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).
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
Port Isabel, TX
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.03"Hg - Average pressure in March:
29.99"Hg - Average pressure in April:
29.9"Hg - Average pressure in May:
29.88"Hg - Average pressure in June:
29.88"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.91"Hg - Average pressure in October:
29.96"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.06"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
Port Isabel, TX
- Average wind speed in January:
13.4mph - Average wind speed in February:
13.7mph - Average wind speed in March:
14mph - Average wind speed in April:
14.2mph - Average wind speed in May:
14mph - Average wind speed in June:
12.9mph
- Average wind speed in July:
12.9mph - Average wind speed in August:
11.5mph - Average wind speed in September:
10.9mph - Average wind speed in October:
12.4mph - Average wind speed in November:
13.3mph - Average wind speed in December:
13.5mph
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
Port Isabel, TX
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Port Isabel, TX
- Average rainfall in January:
1.57" - Average rainfall in February:
0.71" - Average rainfall in March:
0.87" - Average rainfall in April:
0.51" - Average rainfall in May:
1.18" - Average rainfall in June:
2.24"
- Average rainfall in July:
2.6" - Average rainfall in August:
1.77" - Average rainfall in September:
4.13" - Average rainfall in October:
2.56" - Average rainfall in November:
1.89" - Average rainfall in December:
1.34"
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
Port Isabel, TX
- Average rainfall days in January:
12.3 days - Average rainfall days in February:
9.4 days - Average rainfall days in March:
8.2 days - Average rainfall days in April:
8.8 days - Average rainfall days in May:
8.4 days - Average rainfall days in June:
13.3 days
- Average rainfall days in July:
10.4 days - Average rainfall days in August:
12.2 days - Average rainfall days in September:
19.8 days - Average rainfall days in October:
13.5 days - Average rainfall days in November:
14.1 days - Average rainfall days in December:
12.8 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
Port Isabel, TX
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 / Average sunshine
Port Isabel, TX
- Average daylight in January:
10h and 42min - Average daylight in February:
11h and 18min - Average daylight in March:
12h and 0min - Average daylight in April:
12h and 48min - Average daylight in May:
13h and 24min - Average daylight in June:
13h and 42min
- Average daylight in July:
13h and 36min - Average daylight in August:
13h and 0min - Average daylight in September:
12h and 18min - Average daylight in October:
11h and 30min - Average daylight in November:
10h and 54min - Average daylight in December:
10h and 30min
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 6min - Average sunshine in February:
7h and 0min - Average sunshine in March:
7h and 42min - Average sunshine in April:
8h and 54min - Average sunshine in May:
10h and 42min - Average sunshine in June:
11h and 6min
- Average sunshine in July:
11h and 18min - Average sunshine in August:
10h and 18min - Average sunshine in September:
9h and 0min - Average sunshine in October:
7h and 30min - Average sunshine in November:
5h and 24min - Average sunshine in December:
4h and 48min
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
Port Isabel, TX
- Average sunshine days in January:
16 days - Average sunshine days in February:
16.4 days - Average sunshine days in March:
20.7 days - Average sunshine days in April:
19.3 days - Average sunshine days in May:
20.6 days - Average sunshine days in June:
14.5 days
- Average sunshine days in July:
17.3 days - Average sunshine days in August:
14.4 days - Average sunshine days in September:
7.2 days - Average sunshine days in October:
14.6 days - Average sunshine days in November:
13.1 days - Average sunshine days in December:
14.9 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
Port Isabel, TX
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
Port Isabel, TX
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
Port Isabel, TX
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).
