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Monthly climate in Galveston, Texas, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Galveston features a humid subtropical climate (Cfa).Temperatures typically range between 14 °C (57 °F) and 29 °C (84 °F) through the year, but rarely can drop to -6 °C (22 °F) or can rise to as high as 33 °C (91 °F).The average annual precipitation amounts to about 1590 mm (62.6 inches) and receives 144 rainy days on the 1 mm (0.04 inches) threshold annually.Galveston enjoys an average of 3246 hours of sunshine throughout the year, and daylight varies from 10 hours 17 minutes to 13 hours 58 minutes per day.

Monthly average temperatures in Galveston, Texas, United States §

The warmest months in Galveston are June, July and August, with daily mean temperatures ranging from 27 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 14 to 16 °C (57 - 61 °F) throughout the day. On average each year, Galveston experiences 144 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 Galveston, 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 24°C
(75°F)		 21°C
(71°F)		 24°C
(76°F)		 27°C
(82°F)		 29°C
(85°F)		 32°C
(89°F)		 33°C
(91°F)		 32°C
(89°F)		 32°C
(89°F)		 29°C
(85°F)		 25°C
(78°F)		 23°C
(74°F)
Mean maximum 21°C
(69°F)		 20°C
(69°F)		 23°C
(74°F)		 26°C
(79°F)		 28°C
(82°F)		 30°C
(86°F)		 31°C
(88°F)		 31°C
(88°F)		 31°C
(87°F)		 28°C
(83°F)		 24°C
(76°F)		 22°C
(72°F)
Average high 16°C
(61°F)		 17°C
(62°F)		 20°C
(68°F)		 23°C
(73°F)		 26°C
(79°F)		 28°C
(83°F)		 29°C
(85°F)		 30°C
(85°F)		 28°C
(83°F)		 26°C
(78°F)		 20°C
(69°F)		 18°C
(64°F)
Daily mean 14°C
(57°F)		 15°C
(59°F)		 18°C
(65°F)		 21°C
(70°F)		 25°C
(77°F)		 27°C
(82°F)		 28°C
(83°F)		 29°C
(84°F)		 27°C
(81°F)		 24°C
(76°F)		 19°C
(66°F)		 16°C
(61°F)
Average low 12°C
(53°F)		 13°C
(56°F)		 17°C
(63°F)		 20°C
(68°F)		 24°C
(75°F)		 26°C
(80°F)		 27°C
(81°F)		 27°C
(82°F)		 26°C
(79°F)		 23°C
(73°F)		 17°C
(63°F)		 14°C
(58°F)
Mean minimum 3°C
(38°F)		 4°C
(40°F)		 9°C
(49°F)		 13°C
(56°F)		 20°C
(68°F)		 24°C
(76°F)		 25°C
(77°F)		 25°C
(78°F)		 23°C
(73°F)		 14°C
(57°F)		 9°C
(49°F)		 7°C
(45°F)
Minimum -2°C
(29°F)		 -6°C
(22°F)		 3°C
(38°F)		 10°C
(51°F)		 17°C
(62°F)		 23°C
(74°F)		 24°C
(76°F)		 24°C
(75°F)		 20°C
(68°F)		 11°C
(51°F)		 5°C
(41°F)		 4°C
(40°F)

Compare climate in Galveston with other places

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

Monthly average precipitation in Galveston, Texas, United States §

Galveston usually has the most precipitation in June, August and September, with an average of 15 rainy days and 208 mm (8.2 inches) of precipitation per month.The driest months in Galveston are March, April and November. On average, 74 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Galveston, 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) 90 (3.6) 88 (3.4) 58 (2.3) 86 (3.4) 164 (6.5) 170 (6.7) 151 (5.9) 210 (8.3) 243 (9.6) 150 (5.9) 77 (3.0) 104 (4.1)
Average precipitation days (≥ 1 mm) 9 13 8 10 12 13 14 18 16 12 9 10

Monthly sunshine hours in Galveston, Texas, United States §

The sunniest months in Galveston are June, July and August, when the sun shines an average of 10 hours 32 minutes a day.Least sunny months in Galveston: January, February and December receive an average of 6 hours 30 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Galveston, 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 175 184 265 281 317 319 327 323 274 283 261 231
Mean daily daylight hours 10h 29m 11h 9m 12h 0m 12h 53m 13h 37m 13h 58m 13h 46m 13h 7m 12h 17m 11h 25m 10h 39m 10h 17m

Solar UV radiation in Galveston, Texas, United States §

Galveston experiences the highest level of ultraviolet (UV) radiation in June, 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 Moderate / 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 Galveston UV Index data.

Average daily maximum UV levels by month for Galveston, 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) 5 8 9 11 11 12 12 12 11 9 7 5