Climate - Teresina (Piauí)

The climate of Teresina is tropical, with a rainy season from December to May and a dry season from June to November. The latter period is also very hot, especially from August to November. In fact, Teresina is one of the hottest cities in Brazil. During the rainy season, the rains often occur in the form of thunderstorms, perhaps with gusts of wind.
The city is the capital of the state of Piauí and is located in the north-east of Brazil, at 5 degrees south latitude, on the banks of the Parnaíba River, beyond which lies the twin city of Timon, in the state of Maranhão.

Best Time

---

It is difficult to find the best time in Teresina, since the dry season, from June to November, which in any case will be preferred, is also very hot. In June and July the temperature is a bit lower, but the humidity is a bit higher.

Teresina - Climate data

In Teresina, the average temperature of the coldest month (March) is of 28.5 °C (83.2 °F), that of the warmest month (October) is of 31.5 °C (88.7 °F). Here are the average temperatures.
In Teresina, precipitation amounts to 1395 millimeters (54.9 inches) per year: it is therefore quite abundant. It ranges from 8 mm (0.3 in) in the driest month (August) to 300 mm (11.8 in) in the wettest one (March). Here is the average precipitation.
In Teresina, there are on average around 2785 sunshine hours per year. Here are the average hours of sunshine per day.

Teresina - Weather by month

Based on the period 1991-2020

---

In January, the weather in Teresina is usually very hot and muggy. The average temperature is of 29.0 °C (84 °F), with a minimum of 24.1 °C (75.3 °F) and a maximum of 34 °C (93.3 °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 37 °C (98.5 °F).
Precipitation amounts to 180 mm (7.1 in), distributed over 11 days.
The day lasts on average 12 hours and 25 minutes.
There are on average 6 hours of sunshine per day. So, the sun shines 48% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).

---

In February, the weather in Teresina is usually very hot and muggy. The average temperature is of 28.6 °C (83 °F), with a minimum of 23.9 °C (74.9 °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 (71 °F).
On the warmest days of the month, the temperature usually reaches around 35.5 °C (95.5 °F).
Precipitation amounts to 270 mm (10.6 in), distributed over 15 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 44% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).

---

In March, the least warm month of the year, the weather in Teresina is usually very hot and muggy. The average temperature is of 28.5 °C (83 °F), with a minimum of 23.9 °C (75 °F) and a maximum of 33.1 °C (91.5 °F).
On the coldest nights, the temperature usually drops to around 21.5 °C (71 °F).
On the warmest days, the temperature usually reaches around 35 °C (94.5 °F).
Precipitation amounts to 300 mm (11.8 in), distributed over 19 days.
The day lasts on average 12 hours and 5 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 45% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 4 kph (3 mph).

---

In April, the weather in Teresina is usually very hot and muggy. The average temperature is of 28.6 °C (83 °F), with a minimum of 24 °C (75.3 °F) and a maximum of 33.1 °C (91.6 °F).
On the coldest nights, the temperature usually drops to around 22.5 °C (72.5 °F).
On the warmest days, the temperature usually reaches around 34.5 °C (94 °F).
Precipitation amounts to 270 mm (10.6 in), distributed over 16 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 6 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 4 kph (3 mph).

---

In May, the weather in Teresina is usually very hot and muggy. The average temperature is of 28.8 °C (84 °F), with a minimum of 24.3 °C (75.7 °F) and a maximum of 33.4 °C (92.1 °F).
On the coldest nights, the temperature usually drops to around 22.5 °C (72.5 °F).
On the warmest days, the temperature usually reaches around 35 °C (95 °F).
Precipitation amounts to 115 mm (4.5 in), distributed over 10 days.
The day lasts on average 11 hours and 55 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 66% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).

---

In June, the weather in Teresina is usually very hot. The average temperature is of 28.7 °C (84 °F), with a minimum of 23.7 °C (74.6 °F) and a maximum of 33.7 °C (92.6 °F).
On the coldest nights, the temperature usually drops to around 21 °C (70 °F).
On the warmest days, the temperature usually reaches around 35 °C (95.5 °F).
Precipitation amounts to 25 mm (1 in), distributed over 3 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 74% of the time.
The average humidity is 69%.
The average wind speed is 5 kph (3 mph).

---

In July, the weather in Teresina is usually very hot. The average temperature is of 28.8 °C (84 °F), with a minimum of 23.2 °C (73.7 °F) and a maximum of 34.5 °C (94.1 °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 36 °C (96.5 °F).
Precipitation amounts to 10 mm (0.4 in), and all occurs in one day.
The day lasts on average 11 hours and 55 minutes.
There are on average 9.5 hours of sunshine per day. So, the sun shines 80% of the time.
The average humidity is 61%.
The average wind speed is 6 kph (4 mph).

---

In August, the weather in Teresina is usually very hot. The average temperature is of 29.7 °C (85 °F), with a minimum of 23.3 °C (74 °F) and a maximum of 36.1 °C (97 °F).
On the coldest nights of the month, the temperature usually drops to around 20.5 °C (69 °F).
On the warmest days of the month, the temperature usually reaches around 38 °C (100 °F).
Precipitation amounts to only 8 mm (0.3 in), and all occurs in one day.
The day lasts on average 12 hours and 0 minutes.
There are on average 10 hours of sunshine per day. So, the sun shines 85% of the time.
The average humidity is 54%.
The average wind speed is 6 kph (4 mph).

---

In September, the weather in Teresina is usually very hot. However, there are remarkable differences between night and day. The average temperature is of 30.9 °C (88 °F), with a minimum of 24.2 °C (75.6 °F) and a maximum of 37.5 °C (99.5 °F).
On the coldest nights, the temperature usually drops to around 22 °C (71 °F).
On the warmest days, the temperature usually reaches around 39 °C (102.5 °F).
Precipitation amounts to only 9 mm (0.4 in), distributed over 2 days.
The day lasts on average 12 hours and 5 minutes.
There are on average 9.5 hours of sunshine per day. So, the sun shines 78% of the time.
The average humidity is 51%.
The average wind speed is 6 kph (4 mph).

---

In October, the hottest month of the year, the weather in Teresina is usually very hot. The average temperature is of 31.5 °C (89 °F), with a minimum of 25 °C (76.9 °F) and a maximum of 38 °C (100.4 °F).
On the coldest nights, the temperature usually drops to around 23 °C (73 °F).
On the warmest days, the temperature usually reaches around 39.5 °C (103.5 °F).
Precipitation amounts to 20 mm (0.8 in), distributed over 2 days.
The day lasts on average 12 hours and 10 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 71% of the time.
The average humidity is 52%.
The average wind speed is 7 kph (4 mph).

---

In November, the weather in Teresina is usually very hot. The average temperature is of 31.1 °C (88 °F), with a minimum of 25.1 °C (77.2 °F) and a maximum of 37.1 °C (98.8 °F).
On the coldest nights, the temperature usually drops to around 23 °C (73 °F).
On the warmest days, the temperature usually reaches around 39 °C (102.5 °F).
Precipitation amounts to 75 mm (3 in), distributed over 4 days.
The day lasts on average 12 hours and 25 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 62% of the time.
The average humidity is 57%.
The average wind speed is 6 kph (4 mph).

---

In December, the weather in Teresina is usually very hot. The average temperature is of 30.5 °C (87 °F), with a minimum of 24.9 °C (76.8 °F) and a maximum of 36 °C (96.9 °F).
On the coldest nights of the month, the temperature usually drops to around 22.5 °C (72.5 °F).
On the warmest days of the month, the temperature usually reaches around 38.5 °C (101.5 °F).
Precipitation amounts to 120 mm (4.7 in), distributed over 7 days.
The day lasts on average 12 hours and 25 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 52% of the time.
The average humidity is 63%.
The average wind speed is 6 kph (4 mph).