Sylhet, Bangladesh Climate
The warmest month is April, with an average high of 33°C; the coldest is January, with an average low of 12°C. A normal year brings 3148 mm of precipitation.
Temperature through the year
The normal daily high and low. The line marks today.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
Normals for Sep 25
- Normal high
- 30°C
- Normal low
- 24°C
- Reanalysis high
- 33°Cin 1998
- Reanalysis low
- 23°Cin 2000
- Chance of a wet day
- 76%
- Daylight
- 12 h 04 min
Month by month
Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.
| Month | Avg high | Avg low | Warmest | Coldest | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | 24°C | 12°C | 30°C (1995) | 4°C (2013) | 9 mm | 3.1 |
| February | 27°C | 14°C | 33°C (1999) | 7°C (2004) | 28 mm | 2.8 |
| March | 31°C | 18°C | 39°C (1995) | 10°C (2003) | 87 mm | 9.3 |
| April | 33°C | 22°C | 42°C (1999) | 16°C (2005) | 300 mm | 18.0 |
| May | 32°C | 24°C | 41°C (1999) | 19°C (2004) | 462 mm | 24.8 |
| June | 31°C | 25°C | 39°C (1995) | 23°C (2010) | 585 mm | 27.0 |
| July | 31°C | 25°C | 36°C (1994) | 23°C (2007) | 586 mm | 31.0 |
| August | 31°C | 25°C | 36°C (2007) | 23°C (2011) | 490 mm | 27.9 |
| September | 31°C | 25°C | 36°C (2005) | 20°C (1997) | 369 mm | 24.0 |
| October | 30°C | 22°C | 36°C (2007) | 17°C (1992) | 195 mm | 12.4 |
| November | 28°C | 18°C | 33°C (1994) | 12°C (2006) | 21 mm | 3.0 |
| December | 25°C | 14°C | 31°C (2010) | 8°C (2004) | 16 mm | 0.0 |
| Year | 29°C | 20°C | 3148 mm | 183 |
Precipitation
Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.
3148 mm in a normal year, most in July.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Sylhet.
The muggiest month is June, when 100 percent of days are muggy or worse, with a mean dew point of 18°C or more.
| Month | Dew point | Humidity | Dry | Comfortable | Humid | Muggy | Oppressive | Miserable |
|---|---|---|---|---|---|---|---|---|
| January | 10°C | 67% | 78% | 20% | 1% | 0% | 0% | 0% |
| February | 11°C | 60% | 65% | 25% | 8% | 2% | 0% | 0% |
| March | 13°C | 55% | 41% | 22% | 20% | 14% | 3% | 0% |
| April | 20°C | 66% | 5% | 7% | 16% | 33% | 30% | 8% |
| May | 24°C | 78% | 0% | 0% | 1% | 8% | 45% | 46% |
| June | 26°C | 86% | 0% | 0% | 0% | 0% | 5% | 95% |
| July | 26°C | 88% | 0% | 0% | 0% | 0% | 0% | 100% |
| August | 26°C | 88% | 0% | 0% | 0% | 0% | 0% | 100% |
| September | 25°C | 87% | 0% | 0% | 0% | 1% | 11% | 88% |
| October | 22°C | 81% | 0% | 1% | 5% | 23% | 50% | 21% |
| November | 17°C | 75% | 5% | 15% | 43% | 33% | 4% | 0% |
| December | 13°C | 72% | 44% | 38% | 16% | 1% | 0% | 0% |
Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.
Clouds
Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.
The clearest month is December, with the sky 29 percent covered on average; the cloudiest is July, at 90 percent.
Wind
The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.
The windiest month is July, averaging 10.4 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jun 19, with 13 h 42 min of daylight; the shortest is Dec 21, with 10 h 35 min.
- Day length
Solar energy
Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.
Month pages
The weather in Sylhet in each month, day by day.
What this means
A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.
Where no station record is within reach, the extremes shown are the highest and lowest the reanalysis produced for the date in 1991-2020, not measured records.
Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.
More for this place
Nearby
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.