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Sylhet, Bangladesh climate
Cwa Monsoon-influenced humid subtropical
Sylhet has a mildly seasonal tropical climate (Monsoon-influenced humid subtropical, Köppen Cwa). The hottest month is August with an average daily high near 33°C, while the coldest is January averaging around 12°C at night. Precipitation totals about 3580 mm a year and is strongly seasonal — June alone averages 647 mm while December barely receives 0 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Sylhet climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 24 | 27 | 31 | 33 | 32 | 31 | 31 | 33 | 31 | 30 | 27 | 24 |
| Avg temp (°C) | 18 | 20 | 25 | 27 | 28 | 28 | 28 | 29 | 28 | 26 | 23 | 19 |
| Avg low (°C) | 12 | 14 | 18 | 22 | 24 | 25 | 25 | 25 | 25 | 22 | 18 | 14 |
| Precipitation (mm) | 7 | 19 | 99 | 434 | 627 | 647 | 588 | 498 | 513 | 128 | 22 | 0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 24 | 27 | 31 | 33 | 32 | 31 |
| Avg temp (°C) | 18 | 20 | 25 | 27 | 28 | 28 |
| Avg low (°C) | 12 | 14 | 18 | 22 | 24 | 25 |
| Precipitation (mm) | 7 | 19 | 99 | 434 | 627 | 647 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 33 | 31 | 30 | 27 | 24 |
| Avg temp (°C) | 28 | 29 | 28 | 26 | 23 | 19 |
| Avg low (°C) | 25 | 25 | 25 | 22 | 18 | 14 |
| Precipitation (mm) | 588 | 498 | 513 | 128 | 22 | 0 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 0.7 | 2 | 5 | 9 | 13 | 12 | 15 | 17 | 12 | 6 | 0.8 | 0.4 |
| Days with high ≥ 32°C (days) | — | 0.8 | 9 | 9 | 9 | 8 | 13 | 15 | 13 | 11 | 3 | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 0.7 | 2 | 5 | 9 | 13 | 12 |
| Days with high ≥ 32°C (days) | — | 0.8 | 9 | 9 | 9 | 8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 15 | 17 | 12 | 6 | 0.8 | 0.4 |
| Days with high ≥ 32°C (days) | 13 | 15 | 13 | 11 | 3 | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 30 | 30 | 43 | 63 | 76 | 88 | 91 | 89 | 81 | 51 | 25 | 25 |
| Relative humidity (%) | 67 | 60 | 55 | 66 | 77 | 86 | 88 | 88 | 87 | 81 | 75 | 72 |
| Wind speed (m/s) | 1.4 | 1.5 | 1.6 | 1.4 | 1.5 | 1.8 | 1.9 | 1.6 | 1.4 | 1.3 | 1.3 | 1.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 30 | 30 | 43 | 63 | 76 | 88 |
| Relative humidity (%) | 67 | 60 | 55 | 66 | 77 | 86 |
| Wind speed (m/s) | 1.4 | 1.5 | 1.6 | 1.4 | 1.5 | 1.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 91 | 89 | 81 | 51 | 25 | 25 |
| Relative humidity (%) | 88 | 88 | 87 | 81 | 75 | 72 |
| Wind speed (m/s) | 1.9 | 1.6 | 1.4 | 1.3 | 1.3 | 1.3 |
Methodology & sources
Temperature — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.
Precipitation — 1991–2020 normals computed from 7 years of daily observations at Osmany Intl, a weather station, about 7 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.