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Monthly climate in San Sebastian, Retalhuleu, Guatemala

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification San Sebastian features a tropical savanna climate (Aw).Temperatures typically range between 26 °C (79 °F) and 28 °C (83 °F) through the year, but rarely can drop to 18 °C (65 °F) or can rise to as high as 37 °C (99 °F).The average annual precipitation amounts to about 2592 mm (102.1 inches) and receives 229 rainy days on the 1 mm (0.04 inches) threshold annually.San Sebastian enjoys an average of 3559 hours of sunshine throughout the year, and daylight varies from 11 hours 15 minutes to 12 hours 57 minutes per day.

Monthly average temperatures in San Sebastian, Retalhuleu, Guatemala §

The warmest months in San Sebastian are March, April and May, with daily mean temperatures ranging from 27 to 28 °C (81 - 83 °F) throughout the day. The coldest temperatures usually occur in January, September and October, when daily mean temperatures range from 26 to 26 °C (79 - 80 °F) throughout the day. On average each year, San Sebastian experiences 329 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 Sebastian, Retalhuleu, Guatemala.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
(93°F)		 36°C
(97°F)		 36°C
(96°F)		 37°C
(99°F)		 37°C
(98°F)		 34°C
(93°F)		 34°C
(93°F)		 33°C
(92°F)		 34°C
(93°F)		 33°C
(92°F)		 34°C
(93°F)		 34°C
(94°F)
Mean maximum 33°C
(92°F)		 35°C
(94°F)		 35°C
(95°F)		 36°C
(96°F)		 35°C
(95°F)		 32°C
(90°F)		 33°C
(92°F)		 33°C
(92°F)		 33°C
(92°F)		 32°C
(91°F)		 33°C
(91°F)		 34°C
(93°F)
Average high 32°C
(89°F)		 33°C
(91°F)		 33°C
(92°F)		 34°C
(93°F)		 32°C
(90°F)		 31°C
(88°F)		 32°C
(89°F)		 31°C
(89°F)		 31°C
(88°F)		 30°C
(87°F)		 31°C
(88°F)		 32°C
(89°F)
Daily mean 26°C
(79°F)		 27°C
(81°F)		 28°C
(82°F)		 28°C
(83°F)		 27°C
(81°F)		 27°C
(80°F)		 27°C
(81°F)		 27°C
(80°F)		 26°C
(80°F)		 26°C
(79°F)		 27°C
(80°F)		 26°C
(80°F)
Average low 22°C
(71°F)		 22°C
(72°F)		 23°C
(73°F)		 24°C
(75°F)		 24°C
(75°F)		 24°C
(75°F)		 23°C
(75°F)		 23°C
(74°F)		 23°C
(74°F)		 23°C
(74°F)		 23°C
(74°F)		 22°C
(72°F)
Mean minimum 20°C
(68°F)		 20°C
(68°F)		 21°C
(70°F)		 22°C
(71°F)		 22°C
(73°F)		 22°C
(73°F)		 22°C
(72°F)		 22°C
(72°F)		 22°C
(72°F)		 22°C
(72°F)		 21°C
(70°F)		 20°C
(68°F)
Minimum 18°C
(65°F)		 19°C
(66°F)		 20°C
(68°F)		 21°C
(70°F)		 22°C
(72°F)		 22°C
(72°F)		 21°C
(71°F)		 22°C
(72°F)		 21°C
(71°F)		 22°C
(71°F)		 21°C
(69°F)		 19°C
(67°F)

Compare climate in San Sebastian with other places

Compare temperature, precipitation, sunshine, UV index in San Sebastian, Retalhuleu, Guatemala with other places around the world.

Monthly average precipitation in San Sebastian, Retalhuleu, Guatemala §

San Sebastian usually has the most precipitation in May, September and October, with an average of 29 rainy days and 414 mm (16.3 inches) of precipitation per month.The driest months in San Sebastian are January, February and December. On average, 23 mm (0.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Sebastian, Retalhuleu, Guatemala.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) 24 (1.0) 18 (0.7) 44 (1.7) 105 (4.1) 447 (17.6) 373 (14.7) 292 (11.5) 362 (14.3) 418 (16.5) 378 (14.9) 106 (4.2) 26 (1.0)
Average precipitation days (≥ 1 mm) 6 3 10 17 31 29 26 29 29 29 14 6

Monthly sunshine hours in San Sebastian, Retalhuleu, Guatemala §

The sunniest months in San Sebastian are March, April and December, when the sun shines an average of 10 hours 22 minutes a day.Least sunny months in San Sebastian: January, June and October receive an average of 8 hours 51 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Sebastian, Retalhuleu, Guatemala.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 256 286 322 314 309 280 311 298 280 277 302 317
Mean daily daylight hours 11h 21m 11h 39m 12h 3m 12h 27m 12h 47m 12h 57m 12h 52m 12h 34m 12h 10m 11h 46m 11h 26m 11h 15m

Solar UV radiation in San Sebastian, Retalhuleu, Guatemala §

San Sebastian experiences the highest level of ultraviolet (UV) radiation in April, May and September, when the maximum UV index can reach values of 13 - 14, 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 10. For more detailed information, check out our hourly San Sebastian UV Index data.

Average daily maximum UV levels by month for San Sebastian, Retalhuleu, Guatemala.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) 10 11 13 14 13 13 13 12 13 12 9 9