The hottest month in Sylhet is typically September, with daytime highs averaging around 31.5°C (89°F), based on 10 years of historical weather data. Overnight lows during this period average near 25.2°C (77°F).

What is the coldest month in Sylhet?

The coldest month in Sylhet is typically January, with overnight lows averaging around 12.5°C (55°F) and daytime highs near 23.8°C (75°F), based on 10 years of historical weather data.

Does Sylhet have a rainy season?

Sylhet doesn't have a sharply defined rainy season rainfall is fairly spread across the year based on 10 years of historical data. June is the wettest month on average (about 773 mm), while January is the driest (about 14 mm).

What's the best time of year to visit Sylhet?

The best time to visit Sylhet is typically December to January, when daytime highs average a comfortable 24.6°C (76°F). Rainfall during this window averages around 19 mm, one of the lighter, more comfortable stretches of the year. This is based on 10 years of historical weather data.

Atmospheric Details

Wind

6 km/h

SSE · Light Breeze · Max 15 km/h

Humidity

67 %

Comfortable

UV Index

Very High

Visibility

14 km

Excellent

Pressure

1007 hPa

Stable

Dew Point

26°C

Very humid

Today vs Normal

33°C+2° above normal

The long-term average high for today is 31°C.

Air Quality

Moderate

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.

Health & Activity Advice

⚠ Limit Outdoor Time

UV index is 8 today — very high. Limit sun exposure around midday, apply SPF 30+ every two hours, and seek shade when possible.

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.

Morning before 10 AM or evening after 4 PM is the more comfortable window for outdoor activity today.

It will feel notably hot outside — pace yourself and drink water if you're outdoors for long periods.