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Monthly climate in Port Isabel, Texas, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Port Isabel features a humid subtropical climate (Cfa).Temperatures typically range between 18 °C (64 °F) and 29 °C (84 °F) through the year, but rarely can drop to 0 °C (33 °F) or can rise to as high as 31 °C (88 °F).The average annual precipitation amounts to about 807 mm (31.8 inches) and receives 112 rainy days on the 1 mm (0.04 inches) threshold annually.Port Isabel enjoys an average of 3388 hours of sunshine throughout the year, and daylight varies from 10 hours 31 minutes to 13 hours 43 minutes per day.

Monthly average temperatures in Port Isabel, Texas, United States §

The warmest months in Port Isabel are July, August and September, with daily mean temperatures ranging from 28 to 29 °C (82 - 84 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 18 to 19 °C (64 - 67 °F) throughout the day. On average each year, Port Isabel experiences 174 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Port Isabel, Texas, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 26°C
(79°F)		 26°C
(79°F)		 26°C
(79°F)		 29°C
(84°F)		 29°C
(84°F)		 31°C
(88°F)		 30°C
(86°F)		 31°C
(88°F)		 31°C
(88°F)		 30°C
(87°F)		 27°C
(81°F)		 25°C
(78°F)
Mean maximum 23°C
(74°F)		 23°C
(73°F)		 25°C
(77°F)		 27°C
(81°F)		 28°C
(83°F)		 30°C
(86°F)		 30°C
(86°F)		 30°C
(87°F)		 30°C
(87°F)		 30°C
(86°F)		 27°C
(80°F)		 24°C
(76°F)
Average high 19°C
(67°F)		 20°C
(68°F)		 22°C
(71°F)		 24°C
(76°F)		 27°C
(80°F)		 29°C
(84°F)		 29°C
(84°F)		 29°C
(85°F)		 29°C
(84°F)		 27°C
(81°F)		 24°C
(75°F)		 21°C
(70°F)
Daily mean 18°C
(64°F)		 18°C
(65°F)		 20°C
(69°F)		 23°C
(74°F)		 26°C
(79°F)		 28°C
(82°F)		 28°C
(83°F)		 29°C
(84°F)		 28°C
(82°F)		 26°C
(79°F)		 22°C
(72°F)		 19°C
(67°F)
Average low 16°C
(61°F)		 17°C
(62°F)		 19°C
(67°F)		 22°C
(72°F)		 25°C
(77°F)		 27°C
(80°F)		 27°C
(81°F)		 28°C
(82°F)		 27°C
(80°F)		 24°C
(76°F)		 21°C
(70°F)		 18°C
(64°F)
Mean minimum 8°C
(47°F)		 8°C
(47°F)		 14°C
(57°F)		 18°C
(64°F)		 23°C
(73°F)		 25°C
(77°F)		 25°C
(78°F)		 26°C
(79°F)		 24°C
(76°F)		 16°C
(62°F)		 14°C
(57°F)		 10°C
(51°F)
Minimum 4°C
(40°F)		 0°C
(33°F)		 9°C
(48°F)		 12°C
(54°F)		 22°C
(71°F)		 23°C
(74°F)		 24°C
(76°F)		 25°C
(77°F)		 24°C
(75°F)		 13°C
(57°F)		 8°C
(47°F)		 6°C
(44°F)

Compare climate in Port Isabel with other places

Compare temperature, precipitation, sunshine, UV index in Port Isabel, Texas, United States with other places around the world.

Monthly average precipitation in Port Isabel, Texas, United States §

Port Isabel usually has the most precipitation in July, September and October, with an average of 13 rainy days and 118 mm (4.7 inches) of precipitation per month.The driest months in Port Isabel are February, April and August. On average, 31 mm (1.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Port Isabel, Texas, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 47 (1.9) 36 (1.4) 42 (1.6) 26 (1.0) 68 (2.7) 87 (3.4) 125 (4.9) 32 (1.2) 136 (5.3) 94 (3.7) 71 (2.8) 43 (1.7)
Average precipitation days (≥ 1 mm) 8 8 7 5 7 14 8 8 17 14 9 7

Monthly sunshine hours in Port Isabel, Texas, United States §

The sunniest months in Port Isabel are June, July and August, when the sun shines an average of 10 hours 55 minutes a day.Least sunny months in Port Isabel: January, February and December receive an average of 7 hours 8 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Port Isabel, Texas, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 183 221 274 288 328 332 334 338 292 299 250 245
Mean daily daylight hours 10h 42m 11h 16m 12h 1m 12h 47m 13h 25m 13h 43m 13h 33m 12h 59m 12h 15m 11h 30m 10h 51m 10h 31m

Solar UV radiation in Port Isabel, Texas, United States §

Port Isabel experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 12 - 12, which corresponds to the Extreme category of sun exposure.January, November and December are in the High exposure category. In these months, the maximum values of the UV index do not exceed 7. For more detailed information, check out our hourly Port Isabel UV Index data.

Average daily maximum UV levels by month for Port Isabel, Texas, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 6 9 10 11 12 12 12 12 11 10 7 6