Annual rainfall
3470 mm
Sunamganj climate: the whole year
2020–2024 averages
Sunamganj averages about 3,470 mm of rain a year — 2nd of 64 districts, about 1.6× the national average. Most of it falls around June, while November is nearly dry (10 mm). September is the hottest month (average highs of 32.3°C; the hottest day of 2020–24 hit 38.1°C in September) and January the coolest (average lows of 12.8°C; coldest night 8.3°C in January). A typical year has about 11 days at or above 35°C and about 3 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, March, November.
Rainfall rank (of 64)
2 / 64
Wettest month
June
Driest month
November
Hottest month
September · 32.3°
Coolest month
January · 12.8°
Best months to visit
January, February, March, November
Month by month
| Months | High / Low | Rainfall | Rainy days | Sunshine / day |
|---|---|---|---|---|
| January | 23.5° / 12.8° | 12 mm | 2 | 8.9 |
| February | 25.6° / 14° | 29 mm | 4 | 9.1 |
| March | 29.9° / 18° | 59 mm | 8 | 9.2 |
| April | 31.5° / 21.7° | 174 mm | 15 | 9.2 |
| May | 31.2° / 23.5° | 462 mm | 22 | 8.8 |
| June | 30.8° / 24.6° | 891 mm | 29 | 6 |
| July | 31.9° / 25.6° | 573 mm | 31 | 7.3 |
| August | 31.7° / 25.6° | 560 mm | 30 | 7.4 |
| September | 32.3° / 25.5° | 362 mm | 23 | 8.6 |
| October | 31.1° / 23.6° | 325 mm | 16 | 9 |
| November | 29.4° / 18.5° | 10 mm | 2 | 10.1 |
| December | 25.7° / 14.8° | 13 mm | 2 | 9.2 |
When is the best time to visit Sunamganj?
January, February, March, November — dry and comfortable with little rain. Avoid the September heat and the June rains.
Which month is the wettest in Sunamganj?
June — about 891 mm over 29 rainy days. The driest is November (10 mm).
Which month is the hottest in Sunamganj?
September — average highs of 32.3°C, peaking at 38.1°C in 2020–24. The coolest is January, with average lows of 12.8°C.
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