Sylhet climate
Sylhet (Bangladesh) has a monsoon-influenced humid subtropical climate (Köppen Cwa). The average temperature over the year is 25 °C77 °F, and about 3,707 mm146 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Sylhet climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2374 | 1254 | 1864 | 110.4 |
| Feb | 2679 | 1458 | 2068 | 341.3 |
| Mar | 3187 | 1965 | 2576 | 983.9 |
| Apr | 3290 | 2373 | 2781 | 37715 |
| May | 3289 | 2576 | 2883 | 54021 |
| Jun | 3188 | 2678 | 2983 | 70128 |
| Jul | 3188 | 2678 | 2883 | 69327 |
| Aug | 3188 | 2678 | 2983 | 54521 |
| Sep | 3187 | 2577 | 2882 | 43217 |
| Oct | 3086 | 2373 | 2679 | 2319.1 |
| Nov | 2781 | 1864 | 2373 | 240.9 |
| Dec | 2475 | 1457 | 1966 | 210.8 |
| Year | 3290 | 1254 | 2577 | 3,707146 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 72% | 32% | 3.9 | 10:45 |
| Feb | 66% | 30% | 4.8 | 11:17 |
| Mar | 60% | 46% | 5.3 | 11:57 |
| Apr | 72% | 68% | 5.4 | 12:43 |
| May | 81% | 79% | 5.1 | 13:21 |
| Jun | 88% | 90% | 4.4 | 13:40 |
| Jul | 89% | 93% | 4.5 | 13:32 |
| Aug | 88% | 90% | 4.7 | 12:00 |
| Sep | 87% | 83% | 4.4 | 12:16 |
| Oct | 82% | 54% | 4.4 | 11:31 |
| Nov | 78% | 24% | 4.4 | 10:54 |
| Dec | 76% | 28% | 3.8 | 10:36 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Sylhet is like
The warmest month is August, with an average high of 31 °C88 °F and a low of 26 °C78 °F. The coldest is January, when highs average 23 °C74 °F and lows 12 °C54 °F. There is a clear seasonal cycle, with 11 °C19.7 °F between the average temperature of the warmest and the coolest month.
It is very wet, receiving about 3,707 mm146 in of precipitation per year. The wettest three-month stretch is June–August, which brings 52% of the annual total. Months with less than 20 mm0.8 in on average: January. The wettest month is June (701 mm28 in), the driest is January (11 mm0.4 in).
Relative humidity ranges from 60% in March to 89% in July. The clearest skies (lowest average cloud amount, 24%) are typical of November. Average wind speed near the ground ranges from 5 km/h (3 mph) in December to 7 km/h (4 mph) in July. Daylight lasts from about 10.6 hours in December to 13.7 hours in June.
Best time to visit Sylhet
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November–February. Average highs then reach 23 °C74 °F to 27 °C81 °F. Precipitation is 11 mm0.4 in to 34 mm1.3 in per month.
The most challenging month is June, which is hot, with average highs of 31 °C88 °F, very wet (701 mm28 in) and humid (88% relative humidity).
Comfort score: months are ranked by how close they come to an ideal. That means an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Sylhet
- Winter (December–February) — highs 2374 to 26 °C79 °F, lows 1254 to 14 °C58 °F, about 22 mm0.9 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
- Spring (March–May) — highs 3187 to 32 °C90 °F, lows 1965 to 25 °C76 °F, about 339 mm13 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and a good rain jacket or umbrella and quick-drying shoes.
- Summer (June–August) — highs around 31 °C88 °F, lows around 26 °C78 °F, about 646 mm25 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and a good rain jacket or umbrella and quick-drying shoes.
- Autumn (September–November) — highs 2781 to 31 °C87 °F, lows 1864 to 25 °C77 °F, about 229 mm9.0 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
How Sylhet compares
The nearest larger place is Agartala, about 133 km to the southwest. Compared with it, Sylhet is on average 0.3 °C0.6 °F cooler. It receives 62% more precipitation (3,707 mm146 in vs 2,295 mm90 in). The difference is largest in March (1.8 °C3.2 °F cooler).
World Climates covers 35 places in Bangladesh. By annual mean temperature, Sylhet is the 34th warmest of them. By annual precipitation, it is the 2nd wettest. See all of them on the Bangladesh climate page.
Some places in other countries have a very similar pattern of temperature and rainfall. The closest matches are Silchar (India, Cwa), Agartala (India, Cwa) and Dibrugarh (India, Cwa).
Nearby places
- Climate in Shillong 74 km · 16 °C61 °F · 3,043 mm120 in
- Climate in Silchar 94 km · 25 °C77 °F · 2,911 mm115 in
- Climate in Ashuganj City 129 km · 25 °C78 °F · 2,295 mm90 in
- Climate in Bhairab Bazar 131 km · 25 °C78 °F · 2,295 mm90 in
- Climate in Agartala 133 km · 25 °C78 °F · 2,295 mm90 in
- Climate in Nagar Naluakot 139 km · 25 °C78 °F · 2,181 mm86 in
- Climate in Guwahati 143 km · 25 °C77 °F · 2,012 mm79 in
- Climate in Mymensingh 149 km · 25 °C77 °F · 2,763 mm109 in
Frequently asked questions
What is the warmest month in Sylhet?
August is the warmest month in Sylhet. Its average high is 31 °C (88 °F) and its average low is 26 °C (78 °F).
What is the coldest month in Sylhet?
January is the coldest month. Its average high is 23 °C (74 °F) and its average low is 12 °C (54 °F).
When does it rain the most in Sylhet?
June is the wettest month with about 701 mm (27.6 in) of precipitation. January is the driest with about 11 mm (0.4 in).
What is the best time to visit Sylhet?
Judging by long-term averages, the most comfortable months are November–February.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station. So they can differ from airport records. The gaps are largest on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 103 m, while Sylhet lies at about 26 m. Temperatures on this page were therefore adjusted by +0.5 °C0.9 °F using the standard lapse rate of 6.5 °C per 1,000 m.