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Monthly climate in San Isidro, Mexico

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification San Isidro features a cold semi-arid climate (BSk). Temperatures typically range between 13 °C (56 °F) and 22 °C (71 °F) through the year, but rarely can drop to -2 °C (28 °F) or can rise to as high as 34 °C (94 °F). The average annual precipitation amounts to about 608 mm (23.9 inches) and receives 88 rainy days on the 1 mm (0.04 inches) threshold annually. San Isidro enjoys an average of 3549 hours of sunshine throughout the year, and daylight varies from 10 hours 51 minutes to 13 hours 23 minutes per day.

Monthly average temperatures in San Isidro, Mexico

The warmest months in San Isidro are April, May and June, with daily mean temperatures ranging from 20 to 22 °C (68 - 71 °F) throughout the day. The coldest temperatures usually occur in January, November and December, when daily mean temperatures range from 13 to 15 °C (56 - 58 °F) throughout the day. On average each year, San Isidro experiences 166 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 Isidro. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum28°C
(82°F)		31°C
(89°F)		33°C
(92°F)		34°C
(93°F)		34°C
(94°F)		33°C
(92°F)		30°C
(87°F)		31°C
(88°F)		29°C
(85°F)		29°C
(84°F)		28°C
(84°F)		27°C
(81°F)
Mean maximum26°C
(79°F)		29°C
(85°F)		31°C
(88°F)		32°C
(90°F)		33°C
(92°F)		31°C
(88°F)		28°C
(83°F)		29°C
(84°F)		27°C
(82°F)		27°C
(82°F)		27°C
(80°F)		26°C
(79°F)
Average high21°C
(71°F)		24°C
(76°F)		27°C
(81°F)		29°C
(84°F)		29°C
(85°F)		26°C
(80°F)		25°C
(77°F)		25°C
(78°F)		24°C
(75°F)		23°C
(74°F)		22°C
(72°F)		22°C
(72°F)
Daily mean13°C
(56°F)		16°C
(60°F)		18°C
(64°F)		20°C
(69°F)		22°C
(71°F)		20°C
(68°F)		19°C
(66°F)		19°C
(67°F)		18°C
(65°F)		17°C
(63°F)		15°C
(58°F)		13°C
(56°F)
Average low7°C
(45°F)		9°C
(48°F)		11°C
(51°F)		13°C
(56°F)		15°C
(59°F)		15°C
(59°F)		14°C
(58°F)		14°C
(58°F)		14°C
(58°F)		12°C
(54°F)		9°C
(48°F)		7°C
(44°F)
Mean minimum2°C
(35°F)		3°C
(37°F)		6°C
(43°F)		8°C
(47°F)		11°C
(53°F)		12°C
(54°F)		12°C
(54°F)		12°C
(55°F)		11°C
(52°F)		8°C
(46°F)		3°C
(38°F)		1°C
(33°F)
Minimum-0°C
(32°F)		1°C
(33°F)		1°C
(35°F)		7°C
(45°F)		9°C
(48°F)		9°C
(48°F)		12°C
(53°F)		12°C
(53°F)		8°C
(47°F)		4°C
(39°F)		-1°C
(31°F)		-2°C
(28°F)

Compare climate in San Isidro with other places

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

Monthly average precipitation in San Isidro, Mexico

San Isidro usually has the most precipitation in June, July and September, with an average of 15 rainy days and 122 mm (4.8 inches) of precipitation per month. The driest months in San Isidro are January, February and December. On average, 6 mm (0.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Isidro. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)5 (0.2)7 (0.3)10 (0.4)11 (0.4)35 (1.4)139 (5.5)103 (4.1)89 (3.5)125 (4.9)61 (2.4)19 (0.7)6 (0.2)
Average precipitation days (≥ 1 mm)1123815151417921

Monthly sunshine hours in San Isidro, Mexico

The sunniest months in San Isidro are May, July and August, when the sun shines an average of 10 hours 37 minutes a day. Least sunny months in San Isidro: January, February and November receive an average of 8 hours 28 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Isidro. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours226263312319337316327323287279272282
Mean daily daylight hours10h 59m11h 26m12h 2m12h 38m13h 8m13h 23m13h 15m12h 48m12h 13m11h 37m11h 6m10h 51m

Solar UV radiation in San Isidro, Mexico

San Isidro experiences the highest level of ultraviolet (UV) radiation in April, May and September, when the maximum UV index can reach values of 14 - 15, which corresponds to the Extreme category of sun exposure. January, November and December are in the Very High exposure category. In these months, the maximum values of the UV index do not exceed 9. For more detailed information, check out our hourly San Isidro UV Index data.

Average daily maximum UV levels by month for San Isidro. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)911141515141414141298