Climate - Banjarmasin (Indonesia)

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Banjarmasin's climate is equatorial, hot, humid and rainy all year round, although the rains are more frequent and abundant from December to March and less from June to October, when the south-east monsoon blows, which is dry on the Sunda islands, but here it brings rainfall because it is charged with humidity as it passes over the Java Sea.
The city is located in Indonesia, in the province of South Kalimantan, at the confluence of the Barito and Martapura rivers, at 3 degrees south latitude and 20 km (12 mi) away from the southern coast of Borneo.
Compared to the rest of Borneo, where the temperatures are very stable, here they vary a little more, in particular, they decrease slightly during the southeast monsoon period, especially at night, and increase at the end of the period, in September and October, when they reach the highest levels of the year.
Being close to the equator, Banjarmasin is not affected by tropical cyclones.

Banjarmasin - Climate data

The average temperature of the coldest month (January) is of 27.4 °C (81.4 °F), that of the warmest month (October) is of 28.5 °C (83.3 °F). Here are the average temperatures.
Precipitation amounts to 2465 millimeters (97 inches) per year: it is therefore abundant. It ranges from 90 mm (3.5 in) in the driest month (August) to 335 mm (13.2 in) in the wettest one (January). Here is the average precipitation.
The sea temperature ranges from 28 °C (82 °F) in July, August, September to 30 °C (86 °F) in April. Here are the average sea temperatures.

Banjarmasin - Weather by month

Based on the period 1991-2020

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In January, the coldest month of the year, the weather in Banjarmasin is usually warm to hot. The average temperature is of 27.4 °C (81 °F), with a minimum of 23.8 °C (74.8 °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 °F).
On the warmest days of the month, the temperature usually reaches around 34 °C (93.5 °F).
Precipitation amounts to 335 mm (13.2 in), distributed over 19 days.
The day lasts on average 12 hours and 20 minutes.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is 6 kph (4 mph).
The average sea temperature is of 29 °C (84.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In February, the weather in Banjarmasin is usually very hot. The average temperature is of 27.6 °C (82 °F), with a minimum of 23.8 °C (74.9 °F) and a maximum of 31.4 °C (88.4 °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 34 °C (93 °F).
Precipitation amounts to 300 mm (11.8 in), distributed over 16 days.
The day lasts on average 12 hours and 10 minutes.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is 6 kph (4 mph).
The average sea temperature is of 29 °C (84 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In March, the weather in Banjarmasin is usually very hot. The average temperature is of 27.9 °C (82 °F), with a minimum of 24 °C (75.1 °F) and a maximum of 31.7 °C (89.1 °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 (93.5 °F).
Precipitation amounts to 295 mm (11.6 in), distributed over 17 days.
The day lasts on average 12 hours and 5 minutes.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is 6 kph (4 mph).
The average sea temperature is of 29.5 °C (85 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In April, the weather in Banjarmasin is usually very hot. The average temperature is of 28.3 °C (83 °F), with a minimum of 24.2 °C (75.6 °F) and a maximum of 32.3 °C (90.2 °F).
On the coldest nights of the month, the temperature usually drops to around 22.5 °C (73 °F).
On the warmest days of the month, the temperature usually reaches around 34.5 °C (94 °F).
Precipitation amounts to 220 mm (8.7 in), distributed over 14 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 6 kph (3 mph).
The average sea temperature is of 30 °C (86 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In May, the weather in Banjarmasin is usually very hot. The average temperature is of 28.5 °C (83 °F), with a minimum of 24.2 °C (75.5 °F) and a maximum of 32.8 °C (91.1 °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 195 mm (7.7 in), distributed over 12 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).
The average sea temperature is of 29.5 °C (85.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In June, the weather in Banjarmasin is usually very hot. The average temperature is of 28.0 °C (82 °F), with a minimum of 23.6 °C (74.4 °F) and a maximum of 32.4 °C (90.3 °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 34.5 °C (94.5 °F).
Precipitation amounts to 125 mm (4.9 in), distributed over 10 days.
The day lasts on average 11 hours and 55 minutes.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).
The average sea temperature is of 29 °C (84 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In July, the weather in Banjarmasin is usually warm to hot. The average temperature is of 27.5 °C (81 °F), with a minimum of 22.8 °C (73.1 °F) and a maximum of 32.1 °C (89.9 °F).
On the coldest nights of the month, the temperature usually drops to around 20.5 °C (68.5 °F).
On the warmest days of the month, the temperature usually reaches around 34.5 °C (94 °F).
Precipitation amounts to 110 mm (4.3 in), distributed over 8 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).
The average sea temperature is of 28 °C (83 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In August, the weather in Banjarmasin is usually very hot. The average temperature is of 27.7 °C (82 °F), with a minimum of 22.4 °C (72.4 °F) and a maximum of 33.1 °C (91.5 °F).
On the coldest nights of the month, the temperature usually drops to around 20 °C (68.5 °F).
On the warmest days of the month, the temperature usually reaches around 35 °C (95 °F).
Precipitation amounts to 90 mm (3.5 in), distributed over 8 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is 6 kph (4 mph).
The average sea temperature is of 28 °C (82 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In September, the weather in Banjarmasin is usually very hot. The average temperature is of 28.2 °C (83 °F), with a minimum of 22.6 °C (72.7 °F) and a maximum of 33.8 °C (92.8 °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 35.5 °C (96.5 °F).
Precipitation amounts to 115 mm (4.5 in), distributed over 7 days.
The day lasts on average 12 hours and 5 minutes.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 6 kph (4 mph).
The average sea temperature is of 28 °C (82.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In October, the warmest month of the year, the weather in Banjarmasin is usually very hot. The average temperature is of 28.5 °C (83 °F), with a minimum of 23.3 °C (74 °F) and a maximum of 33.7 °C (92.7 °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 36.5 °C (97.5 °F).
Precipitation amounts to 130 mm (5.1 in), distributed over 9 days.
The day lasts on average 12 hours and 10 minutes.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is 6 kph (4 mph).
The average sea temperature is of 29 °C (84 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In November, the weather in Banjarmasin is usually very hot. The average temperature is of 28.2 °C (83 °F), with a minimum of 23.7 °C (74.7 °F) and a maximum of 32.7 °C (90.9 °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 35.5 °C (96 °F).
Precipitation amounts to 230 mm (9.1 in), distributed over 13 days.
The day lasts on average 12 hours and 20 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 6 kph (4 mph).
The average sea temperature is of 29.5 °C (85 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In December, the weather in Banjarmasin is usually warm to hot. The average temperature is of 27.5 °C (82 °F), with a minimum of 23.7 °C (74.7 °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 315 mm (12.4 in), distributed over 18 days.
The day lasts on average 12 hours and 20 minutes.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is 6 kph (4 mph).
The average sea temperature is of 29.5 °C (85 °F). Therefore, the sea is pleasantly warm and allows long swims.