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Vilhena's climate is
tropical, tempered by altitude, with a rainy season from October to April and a dry season in the austral winter, from June to September, while May and November are transitional months.
The city is located in the west of Brazil, in the state of Rondônia, at 12 degrees south latitude and 600 meters (2,000 feet) above sea level.
The dry period, from June to August, is also the coolest at night (in fact, we are in the austral winter). From time to time, in addition, there may be cool periods due to the winds that blow from the Argentine Pampas, with highs of about 18 °C (64 °F) or even below, while at night the temperature can drop below 10 °C (50 °F).
However, from mid-August to October, the temperature rises and the hottest days of the year are recorded, before the rains.
Vilhena - Climate data
In Vilhena, the
average temperature of the coldest month (July) is of 23.5 °C (74.3 °F), that of the warmest month (September) is of 26.1 °C (79.0 °F). Here are the average temperatures.
Vilhena - Average temperatures (1991-2020) | Month | Min (°C) | Max (°C) | Mean (°C) | Min (°F) | Max (°F) | Mean (°F) |
|---|
| January | 21 | 28 | 24.7 | 70 | 83 | 76.5 |
|---|
| February | 21 | 28 | 24.7 | 70 | 83 | 76.4 |
|---|
| March | 21 | 29 | 25 | 70 | 84 | 77 |
|---|
| April | 21 | 29 | 25.1 | 69 | 85 | 77.1 |
|---|
| May | 19 | 29 | 24.1 | 67 | 84 | 75.4 |
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| June | 18 | 29 | 23.5 | 64 | 84 | 74.3 |
|---|
| July | 17 | 30 | 23.5 | 63 | 86 | 74.3 |
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| August | 18 | 31 | 25 | 65 | 89 | 76.9 |
|---|
| September | 20 | 32 | 26.1 | 69 | 89 | 79 |
|---|
| October | 21 | 31 | 25.9 | 70 | 87 | 78.6 |
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| November | 21 | 30 | 25.6 | 70 | 86 | 78 |
|---|
| December | 21 | 29 | 25 | 70 | 84 | 76.9 |
|---|
| Year | 20 | 29.7 | 24.8 | 68 | 85.4 | 76.5 |
|---|
In Vilhena,
precipitation amounts to 2005 millimeters (78.9 inches) per year: it is therefore abundant. It ranges from 10 mm (0.4 in) in the driest month (July) to 315 mm (12.4 in) in the wettest one (December). Here is the average precipitation.
Vilhena - Average precipitation| Month | Millimeters | Inches | Days |
|---|
| January | 290 | 11.4 | 19 |
|---|
| February | 295 | 11.6 | 18 |
|---|
| March | 295 | 11.6 | 18 |
|---|
| April | 180 | 7.1 | 12 |
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| May | 70 | 2.8 | 9 |
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| June | 35 | 1.4 | 5 |
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| July | 10 | 0.4 | 4 |
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| August | 40 | 1.6 | 3 |
|---|
| September | 85 | 3.3 | 6 |
|---|
| October | 180 | 7.1 | 10 |
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| November | 215 | 8.5 | 13 |
|---|
| December | 315 | 12.4 | 17 |
|---|
| Year | 2005 | 78.9 | 134 |
|---|
Vilhena - Weather by month
Based on the period 1991-2020
In
January, the weather in Vilhena is usually warm to hot and muggy. The average temperature is of 24.7 °C (76 °F), with a minimum of 21 °C (69.8 °F) and a maximum of 28.4 °C (83.2 °F).
On the coldest nights of the month, the temperature usually drops to around 19.5 °C (67 °F).
On the warmest days of the month, the temperature usually reaches around 31.5 °C (89 °F).
Precipitation amounts to 290 mm (11.4 in), distributed over 19 days.
The day lasts on average 12 hours and 50 minutes.
The average humidity is 85%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
In
February, the weather in Vilhena is usually warm to hot and muggy. The average temperature is of 24.7 °C (76 °F), with a minimum of 21 °C (69.7 °F) and a maximum of 28.4 °C (83 °F).
On the coldest nights of the month, the temperature usually drops to around 19 °C (66.5 °F).
On the warmest days of the month, the temperature usually reaches around 31.5 °C (88.5 °F).
Precipitation amounts to 295 mm (11.6 in), distributed over 18 days.
The day lasts on average 12 hours and 30 minutes.
The average humidity is 86%. Hence, the air is normally humid.
The average wind speed is 10 kph (6 mph).
In
March, the weather in Vilhena is usually warm to hot and muggy. The average temperature is of 25.0 °C (77 °F), with a minimum of 21 °C (69.8 °F) and a maximum of 29 °C (84.2 °F).
On the coldest nights, the temperature usually drops to around 19 °C (66 °F).
On the warmest days, the temperature usually reaches around 32 °C (89 °F).
Precipitation amounts to 295 mm (11.6 in), distributed over 18 days.
The day lasts on average 12 hours and 5 minutes.
The average humidity is 85%. Hence, the air is normally humid.
The average wind speed is 10 kph (6 mph).
In
April, the weather in Vilhena is usually warm to hot and muggy. The average temperature is of 25.1 °C (77 °F), with a minimum of 20.7 °C (69.3 °F) and a maximum of 29.5 °C (85 °F).
On the coldest nights, the temperature usually drops to around 17 °C (62.5 °F).
On the warmest days, the temperature usually reaches around 32 °C (89.5 °F).
Precipitation amounts to 180 mm (7.1 in), distributed over 12 days.
The day lasts on average 11 hours and 50 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 10 kph (6 mph).
In
May, the weather in Vilhena is usually warm to hot and muggy. The average temperature is of 24.1 °C (75 °F), with a minimum of 19.3 °C (66.8 °F) and a maximum of 28.8 °C (83.9 °F).
On the coldest nights, the temperature usually drops to around 14.5 °C (58 °F).
On the warmest days, the temperature usually reaches around 31.5 °C (88.5 °F).
Precipitation amounts to 70 mm (2.8 in), distributed over 9 days.
The day lasts on average 11 hours and 30 minutes.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 10 kph (6 mph).
In
June, the weather in Vilhena is usually warm to hot. The average temperature is of 23.5 °C (74 °F), with a minimum of 18 °C (64.3 °F) and a maximum of 29.1 °C (84.3 °F).
On the coldest nights, the temperature usually drops to around 12.5 °C (55 °F).
On the warmest days, the temperature usually reaches around 31.5 °C (89 °F).
Precipitation amounts to 35 mm (1.4 in), distributed over 5 days.
The day lasts on average 11 hours and 25 minutes.
The average humidity is 69%.
The average wind speed is 11 kph (7 mph).
In
July, the coldest month of the year, the weather in Vilhena is usually warm to hot. The average temperature is of 23.5 °C (74 °F), with a minimum of 17 °C (62.7 °F) and a maximum of 30 °C (85.9 °F).
On the coldest nights of the month, the temperature usually drops to around 11 °C (51.5 °F).
On the warmest days of the month, the temperature usually reaches around 32.5 °C (90.5 °F).
Precipitation amounts to 10 mm (0.4 in), distributed over 4 days.
The day lasts on average 11 hours and 30 minutes.
The average humidity is 58%.
The average wind speed is 11 kph (7 mph).
In
August, the weather in Vilhena is usually warm to hot. However, there are remarkable differences between night and day. The average temperature is of 25.0 °C (77 °F), with a minimum of 18.4 °C (65.2 °F) and a maximum of 31.5 °C (88.6 °F).
On the coldest nights of the month, the temperature usually drops to around 12.5 °C (54 °F).
On the warmest days of the month, the temperature usually reaches around 34 °C (93.5 °F).
Precipitation amounts to 40 mm (1.6 in), distributed over 3 days.
The day lasts on average 11 hours and 40 minutes.
The average humidity is 54%.
The average wind speed is 12 kph (7 mph).
In
September, the warmest month of the year, the weather in Vilhena is usually warm to hot. The average temperature is of 26.1 °C (79 °F), with a minimum of 20.4 °C (68.8 °F) and a maximum of 31.8 °C (89.2 °F).
On the coldest nights, the temperature usually drops to around 15 °C (59 °F).
On the warmest days, the temperature usually reaches around 35 °C (95 °F).
Precipitation amounts to 85 mm (3.3 in), distributed over 6 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 64%.
The average wind speed is 12 kph (7 mph).
In
October, the weather in Vilhena is usually warm to hot and muggy. The average temperature is of 25.9 °C (79 °F), with a minimum of 21 °C (69.8 °F) and a maximum of 30.8 °C (87.5 °F).
On the coldest nights, the temperature usually drops to around 18.5 °C (65 °F).
On the warmest days, the temperature usually reaches around 33.5 °C (92.5 °F).
Precipitation amounts to 180 mm (7.1 in), distributed over 10 days.
The day lasts on average 12 hours and 25 minutes.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
In
November, the weather in Vilhena is usually warm to hot and muggy. The average temperature is of 25.6 °C (78 °F), with a minimum of 21.2 °C (70.1 °F) and a maximum of 30 °C (85.9 °F).
On the coldest nights, the temperature usually drops to around 18.5 °C (65 °F).
On the warmest days, the temperature usually reaches around 33 °C (91 °F).
Precipitation amounts to 215 mm (8.5 in), distributed over 13 days.
The day lasts on average 12 hours and 40 minutes.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
In
December, the weather in Vilhena is usually warm to hot and muggy. The average temperature is of 25.0 °C (77 °F), with a minimum of 21.2 °C (70.1 °F) and a maximum of 28.8 °C (83.8 °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 31.5 °C (89 °F).
Precipitation amounts to 315 mm (12.4 in), distributed over 17 days.
The day lasts on average 12 hours and 55 minutes.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).