Weather and climate in Banda Aceh (Indonesia)

The climate of Banda Aceh can be defined as equatorial, since it is hot all year round and without a dry season, although there is a rainier period from October to January, due to the northeast monsoon and to the tropical depressions that form in this period. There are two relatively drier periods, from February and March, when the northeast monsoon got weaker, and from June to August, when the southwest monsoon affects India and Southeast Asia.
The city is the capital of the province of Aceh and is located in the extreme north-west of the island of Sumatra and of all of Indonesia, at 5 degrees north latitude and at the mouth of the Aceh River. A short distance from the coast are some small islands, including Weh (or Sabang), while to the north-west are the Nicobar Islands, belonging to India. Nicobar, belonging to India.
Temperatures are slightly lower in the Northern Hemisphere winter (November to February), and slightly higher from April to August.
Sometimes, in Banda Aceh, particularly heavy rains can lead to floods, especially in the wettest period, from October to January, but occasionally even outside this period.
Being close to the equator, Banda Aceh is generally not directly affected by tropical cyclones. However, from April to December, a cyclone can occasionally form on the sea north of Sumatra, which then heads towards the Andaman Sea. In late December 2001, Tropical Storm Vamei followed an anomalous trajectory, in fact it formed at a very low latitude and directly affected the island of Sumatra.

Banda Aceh - Climate data

The average temperature of the coldest month (December) is of 26.8 °C (80.2 °F), that of the warmest month (June) is of 28.3 °C (83.0 °F). Here are the average temperatures.
Precipitation amounts to 1945 millimeters (76.6 inches) per year: it is therefore abundant. It ranges from 85 mm (3.3 in) in the driest month (June) to 320 mm (12.6 in) in the wettest one (December). Here is the average precipitation.
The sea temperature ranges from 28.5 °C (83 °F) in January, December to 30 °C (86 °F) in April, May. Here are the average sea temperatures.

Banda Aceh - Weather by month

Based on the period 1991-2020

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January is generally a warm to hot, muggy month. The average temperature is of 26.9 °C (80 °F), with a minimum of 22.5 °C (72.6 °F) and a maximum of 31.2 °C (88.1 °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 33 °C (91.5 °F).
Precipitation amounts to 255 mm (10 in), distributed over 9 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 9 kph (5 mph).
The average sea temperature is of 28.5 °C (83.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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February is generally a warm to hot, muggy month. The average temperature is of 27.1 °C (81 °F), with a minimum of 22.5 °C (72.5 °F) and a maximum of 31.7 °C (89.1 °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 33.5 °C (92 °F).
Precipitation amounts to 115 mm (4.5 in), distributed over 6 days.
The day lasts on average 11 hours and 55 minutes.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is 9 kph (5 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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March is generally a very hot, muggy month. The average temperature is of 27.6 °C (82 °F), with a minimum of 22.8 °C (73.1 °F) and a maximum of 32.3 °C (90.1 °F).
On the coldest nights, the temperature usually drops to around 20 °C (68.5 °F).
On the warmest days, the temperature usually reaches around 34 °C (93.5 °F).
Precipitation amounts to 115 mm (4.5 in), distributed over 8 days.
The day lasts on average 12 hours and 5 minutes.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 7 kph (5 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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April is generally a very hot, muggy month. The average temperature is of 28.0 °C (82 °F), with a minimum of 23.2 °C (73.8 °F) and a maximum of 32.7 °C (90.8 °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 34.5 °C (94 °F).
Precipitation amounts to 140 mm (5.5 in), distributed over 9 days.
The day lasts on average 12 hours and 10 minutes.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 6 kph (4 mph).
The average sea temperature is of 30 °C (85.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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May is generally a very hot, muggy month. The average temperature is of 28.2 °C (83 °F), with a minimum of 23.5 °C (74.2 °F) and a maximum of 33 °C (91.4 °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 35.5 °C (96 °F).
Precipitation amounts to 145 mm (5.7 in), distributed over 12 days.
The day lasts on average 12 hours and 25 minutes.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is 6 kph (4 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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June, the hottest month of the year, is generally a very hot, muggy month. The average temperature is of 28.3 °C (83 °F), with a minimum of 23.2 °C (73.8 °F) and a maximum of 33.4 °C (92.2 °F).
On the coldest nights, the temperature usually drops to around 20 °C (68 °F).
On the warmest days, the temperature usually reaches around 35.5 °C (96 °F).
Precipitation amounts to 85 mm (3.3 in), distributed over 10 days.
The day lasts on average 12 hours and 25 minutes.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is 7 kph (4 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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July is generally a very hot, muggy month. The average temperature is of 28.2 °C (83 °F), with a minimum of 23.1 °C (73.6 °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 °C (69.5 °F).
On the warmest days of the month, the temperature usually reaches around 36 °C (96.5 °F).
Precipitation amounts to 95 mm (3.7 in), distributed over 9 days.
The day lasts on average 12 hours and 25 minutes.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 7 kph (4 mph).
The average sea temperature is of 29.5 °C (84.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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August is generally a very hot, muggy month. The average temperature is of 28.1 °C (83 °F), with a minimum of 23 °C (73.4 °F) and a maximum of 33.1 °C (91.6 °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 °F).
Precipitation amounts to 90 mm (3.5 in), distributed over 11 days.
The day lasts on average 12 hours and 20 minutes.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 8 kph (5 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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September is generally a very hot, muggy month. The average temperature is of 27.7 °C (82 °F), with a minimum of 22.8 °C (73.1 °F) and a maximum of 32.5 °C (90.5 °F).
On the coldest nights, the temperature usually drops to around 20.5 °C (69 °F).
On the warmest days, the temperature usually reaches around 35 °C (95 °F).
Precipitation amounts to 160 mm (6.3 in), distributed over 13 days.
The day lasts on average 12 hours and 5 minutes.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 7 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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October is generally a warm to hot, muggy month. The average temperature is of 27.2 °C (81 °F), with a minimum of 22.8 °C (73.1 °F) and a maximum of 31.6 °C (89 °F).
On the coldest nights, the temperature usually drops to around 20.5 °C (69 °F).
On the warmest days, the temperature usually reaches around 34 °C (93.5 °F).
Precipitation amounts to 200 mm (7.9 in), distributed over 16 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 79%. 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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November is generally a warm to hot, muggy month. The average temperature is of 27.0 °C (81 °F), with a minimum of 23 °C (73.3 °F) and a maximum of 31 °C (87.7 °F).
On the coldest nights, the temperature usually drops to around 21 °C (70 °F).
On the warmest days, the temperature usually reaches around 33 °C (91.5 °F).
Precipitation amounts to 225 mm (8.9 in), distributed over 14 days.
The day lasts on average 11 hours and 55 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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December, the least warm month of the year, is generally a warm to hot, muggy month. The average temperature is of 26.8 °C (80 °F), with a minimum of 22.8 °C (73 °F) and a maximum of 30.9 °C (87.5 °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 33 °C (91.5 °F).
Precipitation amounts to 320 mm (12.6 in), distributed over 13 days.
The day lasts on average 11 hours and 50 minutes.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 8 kph (5 mph).
The average sea temperature is of 28.5 °C (83.5 °F). Therefore, the sea is pleasantly warm and allows long swims.