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Heroica Guaymas, Sonora climate

BWh Hot desert

Heroica Guaymas has a seasonal tropical climate (Hot desert, Köppen BWh). The hottest month is July with an average daily high near 36°C, while the coldest is December averaging around 12°C at night. Precipitation totals about 37 mm a year and is strongly seasonal — September alone averages 14 mm while April barely receives 0 mm.

☀️ Summers

Very hot

Highs near 36°C in July.

❄️ Winters

Mild

Lows near 12°C in December.

🌧️ Rain

Very dry

About 37 mm of rain a year.

Wettest in September

⛅ Sky & trend

Fairly sunny

More sun than cloud through 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)

Heroica Guaymas climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	24	25	27	29	32	35	36	36	35	33	28	24
Avg temp (°C)	18	19	21	24	27	31	32	32	31	27	22	18
Avg low (°C)	12	13	15	18	22	27	29	29	27	22	16	12
Precipitation (mm)	0	7	3	0	0	1	0	3	14	1	1	8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	24	25	27	29	32	35
Avg temp (°C)	18	19	21	24	27	31
Avg low (°C)	12	13	15	18	22	27
Precipitation (mm)	0	7	3	0	0	1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	36	36	35	33	28	24
Avg temp (°C)	32	32	31	27	22	18
Avg low (°C)	29	29	27	22	16	12
Precipitation (mm)	0	3	14	1	1	8

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	40	42	37	34	26	26	54	51	36	29	35	41
Relative humidity (%)	49	48	43	39	39	44	60	66	65	55	51	52
Wind speed (m/s)	2.4	2.5	2.5	2.7	2.7	2.8	2.4	2.0	2.1	2.2	2.3	2.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	40	42	37	34	26	26
Relative humidity (%)	49	48	43	39	39	44
Wind speed (m/s)	2.4	2.5	2.5	2.7	2.7	2.8

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	54	51	36	29	35	41
Relative humidity (%)	60	66	65	55	51	52
Wind speed (m/s)	2.4	2.0	2.1	2.2	2.3	2.4

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at General Jose Maria Yanez Intl / Guaymas Intl, a weather station, about 6 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 →