Climate - Porto Velho (Brazil)

Porto Velho's climate is tropical, with a rainy season from October to April and a dry season from June to August, while May and September are transitional months.
The city is the capital of the state of Rondônia and is located in the northwest of Brazil, at 8 degrees south latitude, on the banks of the Madeira River, a tributary of the Amazon River. We are in the Amazon rainforest.
It is generally hot even in the austral winter, however, sometimes, especially in June and July, cool air masses from the south can lower the daytime temperatures to around or below 20 °C (68 °F), while night lows can drop to about 13 °C (55 °F).
Instead, from mid-August to October there can be very hot periods, in which the highest temperatures of the year are reached.

The average temperature of the coldest month (July) is of 27.2 °C (80.9 °F), that of the warmest month (September) is of 28.5 °C (83.4 °F). Here are the average temperatures.
Precipitation amounts to 2255 millimeters (88.8 inches) per year: it is therefore abundant. It ranges from 25 mm (1 in) in the driest month (July) to 320 mm (12.6 in) in the wettest ones (January, December) Here is the average precipitation.
The sea temperature ranges from 26.5 °C (26.5 °F) in August, September to 28.5 °C (28.5 °F) in March, April, May. Here are the average sea temperatures.
On average, there are around 1990 sunshine hours per year. Here are the average sunshine hours per day.

Porto Velho - Weather by month

Based on the period 1991-2020
(January - February - March - April - May - June - July - August - September - October - November - December)

In January, the average temperature is of 27.3 °C (81 °F), with a minimum of 23.4 °C (74.2 °F) and a maximum of 31.2 °C (88.1 °F).
On the coldest nights of the month, the temperature usually drops to around 22 °C (71.5 °F).
On the warmest days of the month, the temperature usually reaches around 34 °C (93 °F).
Precipitation amounts to 320 mm (12.6 in), distributed over 19 days.
On average, there are 105 hours of sunshine per month, i.e. 3.5 hours per day.
The average humidity is 87%.
The average wind speed is 5 kph (3 kph).

In February, the average temperature is of 27.2 °C (81 °F), with a minimum of 23.5 °C (74.2 °F) and a maximum of 30.9 °C (87.7 °F).
On the coldest nights of the month, the temperature usually drops to around 22 °C (71.5 °F).
On the warmest days of the month, the temperature usually reaches around 33.5 °C (92.5 °F).
Precipitation amounts to 315 mm (12.4 in), distributed over 19 days.
On average, there are 100 hours of sunshine per month, i.e. 3.5 hours per day.
The average humidity is 87%.
The average wind speed is 5 kph (3 kph).

In March, the average temperature is of 27.5 °C (81 °F), with a minimum of 23.6 °C (74.4 °F) and a maximum of 31.4 °C (88.4 °F).
On the coldest nights of the month, the temperature usually drops to around 22 °C (71.5 °F).
On the warmest days of the month, the temperature usually reaches around 34 °C (93 °F).
Precipitation amounts to 275 mm (10.8 in), distributed over 20 days.
On average, there are 125 hours of sunshine per month, i.e. 4 hours per day.
The average humidity is 87%.
The average wind speed is 5 kph (3 kph).

In April, the average temperature is of 27.7 °C (82 °F), with a minimum of 23.6 °C (74.6 °F) and a maximum of 31.7 °C (89.1 °F).
On the coldest nights of the month, the temperature usually drops to around 21.5 °C (70.5 °F).
On the warmest days of the month, the temperature usually reaches around 34 °C (93.5 °F).
Precipitation amounts to 250 mm (9.8 in), distributed over 17 days.
On average, there are 140 hours of sunshine per month, i.e. 4.5 hours per day.
The average humidity is 86%.
The average wind speed is 5 kph (3 kph).

In May, the average temperature is of 27.3 °C (81 °F), with a minimum of 23.1 °C (73.6 °F) and a maximum of 31.4 °C (88.6 °F).
On the coldest nights of the month, the temperature usually drops to around 20 °C (68 °F).
On the warmest days of the month, the temperature usually reaches around 34 °C (93.5 °F).
Precipitation amounts to 125 mm (4.9 in), distributed over 11 days.
On average, there are 185 hours of sunshine per month, i.e. 6 hours per day.
The average humidity is 84%.
The average wind speed is 5 kph (3 kph).

In June, the average temperature is of 27.2 °C (81 °F), with a minimum of 22.4 °C (72.2 °F) and a maximum of 32 °C (89.6 °F).
On the coldest nights of the month, the temperature usually drops to around 19 °C (66 °F).
On the warmest days of the month, the temperature usually reaches around 34 °C (93.5 °F).
Precipitation amounts to 50 mm (2 in), distributed over 4 days.
On average, there are 225 hours of sunshine per month, i.e. 7.5 hours per day.
The average humidity is 79%.
The average wind speed is 5 kph (3 kph).

In July, the coldest month of the year, the average temperature is of 27.2 °C (81 °F), with a minimum of 21.3 °C (70.3 °F) and a maximum of 33 °C (91.4 °F).
On the coldest nights of the month, the temperature usually drops to around 17 °C (62.5 °F).
On the warmest days of the month, the temperature usually reaches around 35.5 °C (95.5 °F).
Precipitation amounts to 25 mm (1 in), distributed over 3 days.
On average, there are 260 hours of sunshine per month, i.e. 8.5 hours per day.
The average humidity is 72%.
The average wind speed is 5 kph (3 kph).

In August, the average temperature is of 28.1 °C (83 °F), with a minimum of 21.9 °C (71.4 °F) and a maximum of 34.3 °C (93.7 °F).
On the coldest nights of the month, the temperature usually drops to around 17.5 °C (64 °F).
On the warmest days of the month, the temperature usually reaches around 36.5 °C (98 °F).
Precipitation amounts to 35 mm (1.4 in), distributed over 4 days.
On average, there are 235 hours of sunshine per month, i.e. 7.5 hours per day.
The average humidity is 69%.
The average wind speed is 5 kph (3 kph).

In September, the warmest month of the year, the average temperature is of 28.5 °C (83 °F), with a minimum of 22.9 °C (73.3 °F) and a maximum of 34.1 °C (93.5 °F).
On the coldest nights of the month, the temperature usually drops to around 19.5 °C (67.5 °F).
On the warmest days of the month, the temperature usually reaches around 36.5 °C (98 °F).
Precipitation amounts to 120 mm (4.7 in), distributed over 11 days.
On average, there are 185 hours of sunshine per month, i.e. 6 hours per day.
The average humidity is 74%.
The average wind speed is 5 kph (3 kph).

In October, the average temperature is of 28.3 °C (83 °F), with a minimum of 23.3 °C (74 °F) and a maximum of 33.3 °C (91.9 °F).
On the coldest nights of the month, the temperature usually drops to around 21.5 °C (70.5 °F).
On the warmest days of the month, the temperature usually reaches around 36 °C (97 °F).
Precipitation amounts to 195 mm (7.7 in), distributed over 13 days.
On average, there are 165 hours of sunshine per month, i.e. 5.5 hours per day.
The average humidity is 80%.
The average wind speed is 5 kph (3 kph).

In November, the average temperature is of 27.8 °C (82 °F), with a minimum of 23.5 °C (74.3 °F) and a maximum of 32.2 °C (90 °F).
On the coldest nights of the month, the temperature usually drops to around 21.5 °C (71 °F).
On the warmest days of the month, the temperature usually reaches around 35 °C (95 °F).
Precipitation amounts to 225 mm (8.9 in), distributed over 16 days.
On average, there are 135 hours of sunshine per month, i.e. 4.5 hours per day.
The average humidity is 84%.
The average wind speed is 5 kph (3 kph).

In December, the average temperature is of 27.4 °C (81 °F), with a minimum of 23.4 °C (74.2 °F) and a maximum of 31.3 °C (88.4 °F).
On the coldest nights of the month, the temperature usually drops to around 22 °C (71.5 °F).
On the warmest days of the month, the temperature usually reaches around 34.5 °C (93.5 °F).
Precipitation amounts to 320 mm (12.6 in), distributed over 19 days.
On average, there are 125 hours of sunshine per month, i.e. 4 hours per day.
The average humidity is 86%.
The average wind speed is 5 kph (3 kph).