Average high
32.1°
Sylhet weather in September
Late monsoon, early autumn · 2020–2024 averages
September in Sylhet is late monsoon, early autumn: days average 32.1°C and nights 25.2°C, with about 336 mm of rain over 23 days and roughly 9.2 hours of sunshine a day. Around mid-month the sun rises at 5:37 AM and sets at 5:57 PM, a 12.3-hour day.
Average low
25.2°
Rainfall
336 mm
Rainy days
23
Sunshine / day
9.2 h
Days ≥ 35°C
3
Hottest day (2020–24)
37.5°
Coldest night (2020–24)
23.7°
Wettest single day
70 mm
Sunrise
5:37 AM
Sunset
5:57 PM
Day length
12.3 h
What to expect
- Warm days, with highs around 32.1°C.
- This is monsoon: about 336 mm of rain over 23 days, often as heavy afternoon or overnight downpours.
- Roughly 9.2 hours of sunshine a day.
What to pack
- an umbrella or raincoat and quick-drying footwear
- waterproof covers for phones and documents
Compared with the rest of Bangladesh
In September, Sylhet ranks 22nd of 64 districts for rainfall — roughly 12 mm wetter than the national average; the wettest district this month is Panchagarh (435 mm) and the driest Kishoreganj (261 mm). For heat it ranks 5th, with highs 0.7° above the national mean; Kishoreganj is the hottest district in September (32.4°C) and Bandarban has the coldest nights (23.5°C).
Compared with the months around it
September is about 0.7° warmer than August, with roughly 275 mm less rain. October then turns cooler and drier.
What is the weather like in Sylhet in September?
September in Sylhet is late monsoon, early autumn: days average 32.1°C and nights 25.2°C, with about 336 mm of rain over 23 days and roughly 9.2 hours of sunshine a day. Around mid-month the sun rises at 5:37 AM and sets at 5:57 PM, a 12.3-hour day.
Is September a good time to visit Sylhet?
It is peak monsoon, with about 336 mm of rain. Good for haors, waterfalls and green landscapes; poor for beaches and hill trekking.
Does it rain in Sylhet in September?
Yes — on about 23 days, around 336 mm in total; the wettest single day in 2020–24 brought 70 mm.
How hot is Sylhet in September?
Average highs of 32.1°C and lows of 25.2°C; the hottest September day in 2020–24 reached 37.5°C, and about 3 days top 35°C.
Today's live forecast for Sylhet →
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 |
Places to visit in Sylhet
Sylhet climate: the whole year · Bangladesh weather in September · Farming weather