Weather and climate in Porto Nacional (Tocantins)

The climate of Porto Nacional is tropical, with a rainy season from October to April and a dry season from May to September.
The city is located in Brazil, in the state of Tocantins and along the river of the same name, at 10 degrees south latitude and 240 meters (785 feet) above sea level. The river is very wide because a hydroelectric power plant was built further north, near the city of Lajeado.
About 60 km (37 miles) further north is the state capital, Palmas, which has a similar climate. We are in a transition zone between the north-west of Brazil, where the Amazon rainforest is located, and the north-east, which is more arid.
From June to August, the dry period, would be the austral winter, and in fact the night temperatures decrease a bit, but during the day it is very hot. In addition, from mid-August to October, the temperature rises and the hottest days of the year are recorded, before the rains. In September 2010, the temperature reached 42 °C (107.5 °F), and the average high was 37.9 °C (100 °F).

Best Time

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The best time to visit Porto Nacional is from May to September, being the dry season. It must be said that this is a very hot period, especially in August and September, so you can choose the period from May to July.

Porto Nacional - Climate data

The average temperature of the coldest month (July) is of 26.4 °C (79.5 °F), that of the warmest month (September) is of 29.4 °C (85.0 °F). Here are the average temperatures.
Precipitation amounts to 1625 millimeters (64 inches) per year: it is therefore abundant. It ranges from 1 mm (0 in) in the driest month (July) to 270 mm (10.6 in) in the wettest one (March). Here is the average precipitation.
There are on average around 2380 sunshine hours per year. Here are the average hours of sunshine per day.

Porto Nacional - Weather by month

Based on the period 1991-2015

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January is generally a warm to hot, muggy month. The average temperature is of 27.2 °C (81 °F), with a minimum of 22.6 °C (72.6 °F) and a maximum of 31.9 °C (89.4 °F).
On the coldest nights of the month, the temperature usually drops to around 21 °C (70 °F).
On the warmest days of the month, the temperature usually reaches around 36 °C (96.5 °F).
Precipitation amounts to 255 mm (10 in), distributed over 18 days.
The day lasts on average 12 hours and 35 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 36% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).

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February is generally a warm to hot, muggy month. The average temperature is of 27.3 °C (81 °F), with a minimum of 22.4 °C (72.3 °F) and a maximum of 32.2 °C (90 °F).
On the coldest nights of the month, the temperature usually drops to around 21 °C (70 °F).
On the warmest days of the month, the temperature usually reaches around 36 °C (97 °F).
Precipitation amounts to 240 mm (9.4 in), distributed over 16 days.
The day lasts on average 12 hours and 25 minutes.
There are on average 5 hours of sunshine per day. So, the sun shines 39% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).

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March is generally a warm to hot, muggy month. The average temperature is of 27.1 °C (81 °F), with a minimum of 22.4 °C (72.4 °F) and a maximum of 31.8 °C (89.3 °F).
On the coldest nights, the temperature usually drops to around 20.5 °C (69.5 °F).
On the warmest days, the temperature usually reaches around 35.5 °C (96 °F).
Precipitation amounts to 270 mm (10.6 in), distributed over 18 days.
The day lasts on average 12 hours and 5 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 38% of the time.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).

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April is generally a very hot month. The average temperature is of 27.7 °C (82 °F), with a minimum of 22.4 °C (72.3 °F) and a maximum of 33.1 °C (91.5 °F).
On the coldest nights, the temperature usually drops to around 21 °C (69.5 °F).
On the warmest days, the temperature usually reaches around 36 °C (97 °F).
Precipitation amounts to 165 mm (6.5 in), distributed over 11 days.
The day lasts on average 11 hours and 55 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 53% of the time.
The average humidity is 68%.
The average wind speed is 5 kph (3 mph).

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May is generally a very hot month. The average temperature is of 27.6 °C (82 °F), with a minimum of 21.5 °C (70.7 °F) and a maximum of 33.7 °C (92.7 °F).
On the coldest nights, the temperature usually drops to around 20 °C (67.5 °F).
On the warmest days, the temperature usually reaches around 36 °C (97 °F).
Precipitation amounts to 50 mm (2 in), distributed over 4 days.
The day lasts on average 11 hours and 35 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 71% of the time.
The average humidity is 59%.
The average wind speed is 6 kph (4 mph).

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June is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of 26.6 °C (80 °F), with a minimum of 19.2 °C (66.5 °F) and a maximum of 34 °C (93.1 °F).
On the coldest nights, the temperature usually drops to around 17.5 °C (63.5 °F).
On the warmest days, the temperature usually reaches around 36 °C (96.5 °F).
Precipitation amounts to only 3 mm (0.1 in), distributed over 0 days.
The day lasts on average 11 hours and 30 minutes.
There are on average 9 hours of sunshine per day. So, the sun shines 79% of the time.
The average humidity is 48%.
The average wind speed is 7 kph (5 mph).

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July, the least warm month of the year, is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of 26.4 °C (80 °F), with a minimum of 18.3 °C (65 °F) and a maximum of 34.5 °C (94 °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 36.5 °C (97.5 °F).
Precipitation amounts to only 1 mm (0 in), distributed over 0 days.
The day lasts on average 11 hours and 35 minutes.
There are on average 9.5 hours of sunshine per day. So, the sun shines 81% of the time.
The average humidity is 42%.
The average wind speed is 8 kph (5 mph).

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August is generally a very hot month. However, there are remarkable differences between night and day. The average temperature is of 27.9 °C (82 °F), with a minimum of 19.7 °C (67.4 °F) and a maximum of 36 °C (96.9 °F).
On the coldest nights of the month, the temperature usually drops to around 17.5 °C (63 °F).
On the warmest days of the month, the temperature usually reaches around 38.5 °C (101.5 °F).
Precipitation amounts to only 5 mm (0.2 in), distributed over 0 days.
The day lasts on average 11 hours and 50 minutes.
There are on average 9 hours of sunshine per day. So, the sun shines 76% of the time.
The average humidity is 36%.
The average wind speed is 8 kph (5 mph).

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September, the hottest month of the year, is generally a very hot month. However, there are remarkable differences between night and day. The average temperature is of 29.4 °C (85 °F), with a minimum of 22.5 °C (72.5 °F) and a maximum of 36.4 °C (97.5 °F).
On the coldest nights, the temperature usually drops to around 20 °C (68 °F).
On the warmest days, the temperature usually reaches around 39.5 °C (103 °F).
Precipitation amounts to 50 mm (2 in), distributed over 4 days.
The day lasts on average 12 hours and 5 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 53% of the time.
The average humidity is 43%.
The average wind speed is 7 kph (4 mph).

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October is generally a very hot month. The average temperature is of 28.8 °C (84 °F), with a minimum of 23 °C (73.5 °F) and a maximum of 34.5 °C (94.1 °F).
On the coldest nights, the temperature usually drops to around 20.5 °C (69.5 °F).
On the warmest days, the temperature usually reaches around 38.5 °C (101.5 °F).
Precipitation amounts to 140 mm (5.5 in), distributed over 9 days.
The day lasts on average 12 hours and 20 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 46% of the time.
The average humidity is 59%.
The average wind speed is 6 kph (4 mph).

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November is generally a very hot month. The average temperature is of 27.8 °C (82 °F), with a minimum of 23.2 °C (73.7 °F) and a maximum of 32.4 °C (90.3 °F).
On the coldest nights, the temperature usually drops to around 20.5 °C (68.5 °F).
On the warmest days, the temperature usually reaches around 37 °C (98.5 °F).
Precipitation amounts to 185 mm (7.3 in), distributed over 14 days.
The day lasts on average 12 hours and 35 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 43% of the time.
The average humidity is 70%.
The average wind speed is 5 kph (3 mph).

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December is generally a warm to hot, muggy month. The average temperature is of 27.3 °C (81 °F), with a minimum of 22.6 °C (72.8 °F) and a maximum of 32 °C (89.6 °F).
On the coldest nights of the month, the temperature usually drops to around 21 °C (69.5 °F).
On the warmest days of the month, the temperature usually reaches around 36 °C (97 °F).
Precipitation amounts to 260 mm (10.2 in), distributed over 15 days.
The day lasts on average 12 hours and 40 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 37% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).