Retalhuleu, Guatemala climate

Aw Tropical savanna (dry winter)

Retalhuleu has a remarkably steady tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is April with an average daily high near 34°C, while the coldest is January averaging around 20°C at night. Precipitation totals about 1130 mm a year and is strongly seasonal — September alone averages 249 mm while January barely receives 0 mm.

☀️ All year

Hot

Daytime highs near 34°C most of the year.

🌙 Nights

Stays warm

Even the coolest nights stay near 20°C.

🌧️ Rain

Wet

About 1130 mm of rain a year.

Wettest in September

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

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)

Retalhuleu climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	34	34	34	34	34	34	34	34	33	34	34	34
Avg temp (°C)	27	27	27	28	28	27	27	28	27	27	27	27
Avg low (°C)	20	20	20	21	21	21	21	21	21	21	21	20
Precipitation (mm)	0	0	15	26	116	219	146	168	249	159	31	2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	34	34	34	34	34	34
Avg temp (°C)	27	27	27	28	28	27
Avg low (°C)	20	20	20	21	21	21
Precipitation (mm)	0	0	15	26	116	219

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	34	34	33	34	34	34
Avg temp (°C)	27	28	27	27	27	27
Avg low (°C)	21	21	21	21	21	20
Precipitation (mm)	146	168	249	159	31	2

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	24	27	33	46	68	78	72	75	81	67	40	26
Relative humidity (%)	74	71	68	70	78	83	82	83	86	86	81	77
Wind speed (km/h)	4.6	5.0	5.6	6.0	5.9	6.2	5.5	5.8	6.3	5.9	4.9	4.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	24	27	33	46	68	78
Relative humidity (%)	74	71	68	70	78	83
Wind speed (km/h)	4.6	5.0	5.6	6.0	5.9	6.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	72	75	81	67	40	26
Relative humidity (%)	82	83	86	86	81	77
Wind speed (km/h)	5.5	5.8	6.3	5.9	4.9	4.5

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from CONAGUA / SMN, Mexico's national weather service, measured at Ignacio Lopez Rayon, about 55 km from the city centre.

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 →