Annual rainfall
3646 mm
Sylhet climate: the whole year
2020–2024 averages
Sylhet averages about 3,646 mm of rain a year — 1st of 64 districts, about 1.7× the national average. Most of it falls around June, while January is nearly dry (19 mm). September is the hottest month (average highs of 32.1°C; the hottest day of 2020–24 hit 37.5°C in September) and January the coolest (average lows of 12°C; coldest night 7.8°C in January). A typical year has about 10 days at or above 35°C and about 6 nights at or below 10°C. Worth knowing: dense fog in December–January; haor basin — flash-flood risk in April–May. The most comfortable months to visit are January, February, November, December.
Rainfall rank (of 64)
1 / 64
Wettest month
June
Driest month
January
Hottest month
September · 32.1°
Coolest month
January · 12°
Best months to visit
January, February, November, December
Month by month
| Months | High / Low | Rainfall | Rainy days | Sunshine / day |
|---|---|---|---|---|
| January | 23.7° / 12° | 19 mm | 3 | 9.2 |
| February | 26.3° / 13.6° | 34 mm | 4 | 9.2 |
| March | 30.1° / 17.6° | 111 mm | 9 | 8.7 |
| April | 31.2° / 20.9° | 266 mm | 17 | 9.1 |
| May | 31.1° / 23.1° | 463 mm | 22 | 9 |
| June | 30.6° / 24.5° | 854 mm | 29 | 6.7 |
| July | 31.7° / 25.4° | 606 mm | 31 | 7.7 |
| August | 31.4° / 25.3° | 611 mm | 29 | 7.5 |
| September | 32.1° / 25.2° | 336 mm | 23 | 9.2 |
| October | 30.8° / 23.2° | 300 mm | 16 | 9.1 |
| November | 29.2° / 17.7° | 19 mm | 3 | 10.3 |
| December | 25.5° / 14° | 27 mm | 3 | 9.3 |
When is the best time to visit Sylhet?
January, February, November, December — dry and comfortable with little rain. Avoid the September heat and the June rains.
Which month is the wettest in Sylhet?
June — about 854 mm over 29 rainy days. The driest is January (19 mm).
Which month is the hottest in Sylhet?
September — average highs of 32.1°C, peaking at 37.5°C in 2020–24. The coolest is January, with average lows of 12°C.
Today's live forecast for Sylhet →