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Monthly climate in San Juan, Texas, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification San Juan features a hot semi-arid climate (BSh).Temperatures typically range between 16 °C (62 °F) and 31 °C (88 °F) through the year, but rarely can drop to -5 °C (24 °F) or can rise to as high as 42 °C (109 °F).The average annual precipitation amounts to about 589 mm (23.2 inches) and receives 72 rainy days on the 1 mm (0.04 inches) threshold annually.San Juan enjoys an average of 3315 hours of sunshine throughout the year, and daylight varies from 10 hours 30 minutes to 13 hours 44 minutes per day.

Monthly average temperatures in San Juan, Texas, United States §

The warmest months in San Juan are June, July and August, with daily mean temperatures ranging from 30 to 31 °C (86 - 88 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 16 to 18 °C (62 - 65 °F) throughout the day. On average each year, San Juan experiences 267 days above 25 °C (77.0 °F) and 1 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in San Juan, 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 34°C
(94°F)		 37°C
(100°F)		 37°C
(98°F)		 41°C
(107°F)		 40°C
(105°F)		 42°C
(109°F)		 42°C
(108°F)		 41°C
(106°F)		 41°C
(106°F)		 37°C
(99°F)		 34°C
(94°F)		 34°C
(94°F)
Mean maximum 31°C
(88°F)		 34°C
(93°F)		 35°C
(96°F)		 39°C
(103°F)		 38°C
(101°F)		 39°C
(102°F)		 40°C
(104°F)		 39°C
(103°F)		 39°C
(103°F)		 36°C
(97°F)		 34°C
(93°F)		 32°C
(89°F)
Average high 23°C
(73°F)		 25°C
(77°F)		 28°C
(83°F)		 32°C
(89°F)		 34°C
(93°F)		 35°C
(96°F)		 36°C
(97°F)		 37°C
(100°F)		 34°C
(94°F)		 31°C
(88°F)		 27°C
(80°F)		 24°C
(76°F)
Daily mean 16°C
(62°F)		 18°C
(65°F)		 22°C
(72°F)		 25°C
(78°F)		 28°C
(83°F)		 30°C
(86°F)		 30°C
(87°F)		 31°C
(88°F)		 29°C
(84°F)		 25°C
(77°F)		 20°C
(69°F)		 18°C
(64°F)
Average low 11°C
(53°F)		 13°C
(56°F)		 17°C
(64°F)		 20°C
(69°F)		 23°C
(74°F)		 25°C
(78°F)		 25°C
(78°F)		 26°C
(79°F)		 24°C
(76°F)		 20°C
(69°F)		 15°C
(60°F)		 13°C
(55°F)
Mean minimum 2°C
(36°F)		 3°C
(38°F)		 8°C
(47°F)		 12°C
(53°F)		 17°C
(64°F)		 22°C
(73°F)		 23°C
(74°F)		 24°C
(75°F)		 20°C
(68°F)		 9°C
(49°F)		 6°C
(44°F)		 3°C
(39°F)
Minimum -1°C
(31°F)		 -5°C
(24°F)		 3°C
(38°F)		 8°C
(47°F)		 15°C
(59°F)		 18°C
(65°F)		 22°C
(71°F)		 23°C
(75°F)		 17°C
(64°F)		 6°C
(43°F)		 1°C
(35°F)		 1°C
(34°F)

Compare climate in San Juan with other places

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

Monthly average precipitation in San Juan, Texas, United States §

San Juan usually has the most precipitation in May, July and September, with an average of 8 rainy days and 94 mm (3.7 inches) of precipitation per month.The driest months in San Juan are January, February and December. On average, 20 mm (0.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Juan, 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) 20 (0.8) 21 (0.8) 31 (1.2) 31 (1.2) 87 (3.4) 81 (3.2) 100 (3.9) 22 (0.9) 96 (3.8) 51 (2.0) 30 (1.2) 21 (0.8)
Average precipitation days (≥ 1 mm) 4 5 5 4 7 11 6 5 11 6 5 3

Monthly sunshine hours in San Juan, Texas, United States §

The sunniest months in San Juan are June, July and August, when the sun shines an average of 10 hours 59 minutes a day.Least sunny months in San Juan: January, February and December receive an average of 6 hours 56 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Juan, 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 178 208 259 276 315 333 337 340 289 284 247 245
Mean daily daylight hours 10h 41m 11h 16m 12h 1m 12h 47m 13h 25m 13h 44m 13h 34m 13h 0m 12h 15m 11h 30m 10h 50m 10h 30m

Solar UV radiation in San Juan, Texas, United States §

San Juan 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 San Juan UV Index data.

Average daily maximum UV levels by month for San Juan, 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 9 7 6