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Porto Velho, Brazil climate

As Tropical savanna (dry summer)

Porto Velho has a remarkably steady tropical climate (Tropical savanna (dry summer), Köppen As). The hottest month is September with an average daily high near 34°C, while the coldest is July averaging around 21°C at night. Precipitation totals about 1615 mm a year and is strongly seasonal — March alone averages 277 mm while July barely receives 13 mm.

☀️ All year

Hot

Daytime highs near 34°C most of the year.

🌙 Nights

Stays warm

Even the coolest nights stay near 21°C.

🌧️ Rain

Very wet

About 1615 mm of rain a year.

Wettest in March

⛅ 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)

Porto Velho climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	31	31	31	32	31	32	33	34	34	33	32	31
Avg temp (°C)	27	27	27	28	27	27	27	28	29	28	28	27
Avg low (°C)	23	23	24	24	23	22	21	22	23	23	24	23
Precipitation (mm)	238	240	277	176	74	20	13	27	67	117	157	208

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	31	31	31	32	31	32
Avg temp (°C)	27	27	27	28	27	27
Avg low (°C)	23	23	24	24	23	22
Precipitation (mm)	238	240	277	176	74	20

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	33	34	34	33	32	31
Avg temp (°C)	27	28	29	28	28	27
Avg low (°C)	21	22	23	23	24	23
Precipitation (mm)	13	27	67	117	157	208

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	88	88	87	80	67	45	32	44	65	78	85	87
Relative humidity (%)	91	91	91	91	90	88	81	73	71	76	83	88
Wind speed (m/s)	0.2	0.2	0.2	0.2	0.2	0.2	0.3	0.2	0.2	0.2	0.2	0.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	88	88	87	80	67	45
Relative humidity (%)	91	91	91	91	90	88
Wind speed (m/s)	0.2	0.2	0.2	0.2	0.2	0.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	32	44	65	78	85	87
Relative humidity (%)	81	73	71	76	83	88
Wind speed (m/s)	0.3	0.2	0.2	0.2	0.2	0.2

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Governador Jorge Teixeira DE Oliveira, 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 →