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Monthly climate in San Juan, Mexico

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification San Juan features a hot semi-arid climate (BSh). Temperatures typically range between 16 °C (61 °F) and 31 °C (89 °F) through the year, but rarely can drop to -3 °C (27 °F) or can rise to as high as 44 °C (111 °F). The average annual precipitation amounts to about 588 mm (23.1 inches) and receives 74 rainy days on the 1 mm (0.04 inches) threshold annually. San Juan enjoys an average of 3464 hours of sunshine throughout the year, and daylight varies from 10 hours 33 minutes to 13 hours 41 minutes per day.

Monthly average temperatures in San Juan, Mexico

The warmest months in San Juan are June, July and August, with daily mean temperatures ranging from 30 to 31 °C (86 - 89 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 16 to 18 °C (61 - 65 °F) throughout the day. On average each year, San Juan experiences 263 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 San Juan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum35°C
(95°F)		38°C
(100°F)		40°C
(104°F)		42°C
(108°F)		44°C
(111°F)		44°C
(111°F)		42°C
(107°F)		41°C
(107°F)		40°C
(104°F)		39°C
(102°F)		35°C
(96°F)		36°C
(97°F)
Mean maximum32°C
(89°F)		35°C
(96°F)		37°C
(99°F)		40°C
(104°F)		40°C
(104°F)		40°C
(105°F)		41°C
(106°F)		40°C
(105°F)		39°C
(103°F)		36°C
(98°F)		33°C
(92°F)		32°C
(90°F)
Average high22°C
(73°F)		25°C
(78°F)		29°C
(85°F)		32°C
(90°F)		35°C
(95°F)		36°C
(97°F)		37°C
(99°F)		38°C
(101°F)		34°C
(93°F)		30°C
(87°F)		26°C
(79°F)		24°C
(76°F)
Daily mean16°C
(61°F)		18°C
(65°F)		23°C
(73°F)		25°C
(78°F)		28°C
(83°F)		30°C
(86°F)		31°C
(87°F)		31°C
(89°F)		28°C
(83°F)		24°C
(76°F)		20°C
(68°F)		17°C
(64°F)
Average low11°C
(51°F)		13°C
(55°F)		17°C
(63°F)		20°C
(68°F)		23°C
(74°F)		25°C
(77°F)		25°C
(78°F)		26°C
(78°F)		24°C
(75°F)		19°C
(67°F)		15°C
(59°F)		12°C
(54°F)
Mean minimum3°C
(37°F)		5°C
(41°F)		10°C
(50°F)		12°C
(54°F)		18°C
(64°F)		22°C
(72°F)		23°C
(73°F)		24°C
(75°F)		20°C
(68°F)		10°C
(50°F)		7°C
(45°F)		4°C
(40°F)
Minimum-1°C
(30°F)		-3°C
(27°F)		5°C
(41°F)		8°C
(46°F)		15°C
(59°F)		20°C
(68°F)		22°C
(72°F)		23°C
(73°F)		18°C
(65°F)		8°C
(46°F)		2°C
(36°F)		2°C
(35°F)

Compare climate in San Juan with other places

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

Monthly average precipitation in San Juan, Mexico

San Juan usually has the most precipitation in May, June and September, with an average of 9 rainy days and 97 mm (3.8 inches) of precipitation per month. The driest months in San Juan are February, August and December. On average, 16 mm (0.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Juan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)20 (0.8)13 (0.5)25 (1.0)46 (1.8)86 (3.4)86 (3.4)78 (3.1)16 (0.6)119 (4.7)56 (2.2)23 (0.9)20 (0.8)
Average precipitation days (≥ 1 mm)4356897412853

Monthly sunshine hours in San Juan, Mexico

The sunniest months in San Juan are June, July and August, when the sun shines an average of 11 hours 10 minutes a day. Least sunny months in San Juan: January, February and November receive an average of 7 hours 42 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Juan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours198240286288327339342345289288254263
Mean daily daylight hours10h 44m11h 17m12h 1m12h 46m13h 23m13h 41m13h 31m12h 58m12h 15m11h 31m10h 52m10h 33m

Solar UV radiation in San Juan, Mexico

San Juan experiences the highest level of ultraviolet (UV) radiation in April, May 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. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)68101212121212111076