Sylhet climate

Name: Sylhet
Address: BD

Sylhet is warmest in August, with average highs of 30 °C, and coldest in January, when nights average 11 °C. June is the wettest month (937 mm) and December the driest (12 mm). Figures are 1991–2020 climate normals.

Across a full year Sylhet averages 4,885 mm of rain and 304 days above 25 °C.

Bangladesh · population 237,000 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month August 30 °C
Coldest month January 11 °C
Driest month December 12 mm
Wettest month June 937 mm
Least cloud December 21 % cloud
Hottest on record April 37 °C
Coldest on record January 6.9 °C

What to expectSylhet through the year

Sylhet has a clear annual cycle: average daily highs run from 24 °C in January to 30 °C in August, a swing of 9.8 °C in mean temperature across the year.

Counted across a normal year, 304 days a year reach 25 °C, 128 of them reach 30 °C. The warmest reading in the 1991–2020 record is 37 °C, in April.

Rain is strongly seasonal. June averages 937 mm against 12 mm in December — 81 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	23.6 °C	12 mm	22 %
February	25.8 °C	47 mm	25 %
March	28.7 °C	190 mm	34 %
April	29.4 °C	541 mm	54 %
May	29.8 °C	757 mm	69 %
June	30.1 °C	937 mm	89 %
July	30.2 °C	916 mm	95 %
August	30.5 °C	718 mm	94 %
September	30.2 °C	508 mm	84 %
October	29.4 °C	218 mm	45 %
November	27.4 °C	29 mm	24 %
December	24.8 °C	12 mm	21 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	23.6 °C	11.4 °C	17.4 °C	29.0 °C	6.9 °C	7	0
February	25.8 °C	13.5 °C	19.6 °C	32.2 °C	8.1 °C	18	1
March	28.7 °C	17.2 °C	22.8 °C	34.4 °C	11.0 °C	28	10
April	29.4 °C	20.8 °C	24.8 °C	36.6 °C	14.8 °C	28	13
May	29.8 °C	23.0 °C	26.0 °C	35.5 °C	18.7 °C	30	17
June	30.1 °C	24.6 °C	26.8 °C	35.5 °C	22.2 °C	30	17
July	30.2 °C	24.9 °C	27.0 °C	36.4 °C	23.2 °C	31	18
August	30.5 °C	25.0 °C	27.2 °C	36.0 °C	23.2 °C	31	20
September	30.2 °C	24.4 °C	26.8 °C	36.1 °C	20.0 °C	30	18
October	29.4 °C	22.0 °C	25.4 °C	34.9 °C	15.9 °C	30	12
November	27.4 °C	17.1 °C	22.1 °C	31.8 °C	11.4 °C	28	2
December	24.8 °C	13.1 °C	18.8 °C	29.1 °C	7.6 °C	14	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	12 mm	2	11 h/day	22 %	74 %	7.2 km/h
February	47 mm	5	11 h/day	25 %	72 %	8.2 km/h
March	190 mm	11	12 h/day	34 %	73 %	8.9 km/h
April	541 mm	21	13 h/day	54 %	82 %	8.6 km/h
May	757 mm	28	13 h/day	69 %	87 %	8.2 km/h
June	937 mm	29	14 h/day	89 %	89 %	8.5 km/h
July	916 mm	31	14 h/day	95 %	89 %	8.9 km/h
August	718 mm	30	13 h/day	94 %	88 %	8.2 km/h
September	508 mm	27	12 h/day	84 %	88 %	7.3 km/h
October	218 mm	15	12 h/day	45 %	84 %	6.8 km/h
November	29 mm	3	11 h/day	24 %	76 %	6.8 km/h
December	12 mm	1	11 h/day	21 %	74 %	6.8 km/h

How Sylhet compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Sylhet	30 °C	11 °C	4,885 mm	304
Silchar · India	30 °C	12 °C	2,879 mm	311
Brāhmanbāria · Bangladesh	32 °C	13 °C	2,228 mm	326
Agartala · India	32 °C	12 °C	1,944 mm	328
Nagar Naluākot · Bangladesh	32 °C	13 °C	2,317 mm	328
Guwahati · India	31 °C	12 °C	2,890 mm	295
Mymensingh · Bangladesh	31 °C	12 °C	2,749 mm	320

Planning a trip? See the best time to visit Sylhet.

QuestionsCommon questions about Sylhet’s climate

When is the best time to visit Sylhet?

That depends on what you want, so the honest answer is a comparison rather than a single month. February, November, December sit closest to 20 °C on average, August is the warmest month and December the driest. The month-by-month table above has the full picture.

How hot does Sylhet get?

In August, the warmest month, daily highs average 30 °C. About 128 days a year pass 30 °C. The highest value in the 1991–2020 record is 37 °C.

How cold does it get in winter?

Nights average 11 °C in January, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Sylhet?

June, averaging 937 mm over 29 days with rain. The driest month is December with 12 mm. The year as a whole averages 4,885 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Sylhet rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 24.899°, 91.872° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.