San Marcos, Guatemala climate

BSh Hot semi-arid

San Marcos has a remarkably steady warm-temperate climate (Hot semi-arid, Köppen BSh). The hottest month is May with an average daily high near 81°F, while the coldest is January averaging around 45°F at night. Precipitation totals about 21 inches a year and is strongly seasonal — June alone averages 5.0 inches while January barely receives 0.09 inches.

☀️ Summers

Warm

Highs near 81°F in May.

❄️ Winters

Cool

Lows near 45°F in January.

🌧️ Rain

Fairly dry

About 21 in of rain a year.

Wettest in June

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

San Marcos climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	76	79	82	83	81	78	77	78	78	76	75	76
Avg temp (°F)	61	63	65	68	68	67	66	67	67	66	63	61
Avg low (°F)	45	46	48	52	56	57	55	55	57	56	51	46
Precipitation (in)	0.1	0.1	0.5	1.2	3.4	5.0	2.4	3.7	—	3.3	0.8	0.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	76	79	82	83	81	78
Avg temp (°F)	61	63	65	68	68	67
Avg low (°F)	45	46	48	52	56	57
Precipitation (in)	0.1	0.1	0.5	1.2	3.4	5.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	77	78	78	76	75	76
Avg temp (°F)	66	67	67	66	63	61
Avg low (°F)	55	55	57	56	51	46
Precipitation (in)	2.4	3.7	—	3.3	0.8	0.2

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	47	44	43	51	73	82	76	76	80	73	57	47
Relative humidity (%)	83	78	71	70	77	86	87	87	89	90	89	87
Wind speed (mph)	1.9	1.9	2.1	2.2	2.1	1.8	2.0	1.8	1.6	1.7	1.9	1.8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	47	44	43	51	73	82
Relative humidity (%)	83	78	71	70	77	86
Wind speed (mph)	1.9	1.9	2.1	2.2	2.1	1.8

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	76	76	80	73	57	47
Relative humidity (%)	87	87	89	90	89	87
Wind speed (mph)	2.0	1.8	1.6	1.7	1.9	1.8

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 24 years of daily observations at Huehuetenango, a weather station, about 53 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →