Sylhet weather in December

In December, Sylhet sees average daytime highs of 25°C and overnight lows near 13°C, with 12 mm of rain across 1.1 wet days and about 10.5 hours of daylight. It is the 11th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 24°C by the end. The sky is clear or mostly clear about 83% of the time in December, and the air most often feels comfortable.

Daylight stretches from about 10 h 36 min at the start of December to 10 h 30 min by month's end. Set against the rest of the year, December is Sylhet's 1st-clearest and 12th-windiest month. For the whole year in context, see Sylhet's year-round climate.

Daytime high
25°
11th warmest
Overnight low
13°
2nd coldest
Rainfall
12 mm
1.1 wet days
Daylight
10 h 30 min
6:35 AM – 5:03 PM
Cloud cover
20%
1st clearest
Wind
3 km/h
12th windiest
Solar energy
3.95 kWh/m²
Travel score
9.1
out of 10

Sylhet is capital and largest city of Sylhet Division, Bangladesh.

Air quality
Severe
PM2.5 59.8 µg/m³ · 2018
Density
8,943/km²
people per km²
Founded
1867

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 26°C in the first days to 24°C by the end.

A typical December day in Sylhet reaches about 25°C in the afternoon and slips back to 13°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 27°C. Set against its neighbours, December runs about 3°C cooler than November and about 1°C warmer than January.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12615
22615
32615
42615
52614
62614
72614
82614
92514
102514
112514
122514
132513
142513
152513
162513
172513
182513
192413
202413
212413
222412
232412
242412
252412
262412
272412
282412
292412
302412
312412

How December really feels in Sylhet

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Sylhet weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 11°101.810.69.0
Feb26° / 14°484.611.18.2
Mar29° / 18°18711.211.86.1
Apr29° / 21°56021.412.64.0
May30° / 23°75927.613.23.1
Jun30° / 25°95329.513.52.5
Jul31° / 25°94130.813.42.3
Aug31° / 26°73330.712.92.3
Sep31° / 25°52327.612.22.6
Oct30° / 23°21714.811.44.7
Nov28° / 17°282.310.87.8
Dec25° / 13°121.110.59.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 83% of the time in December, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 7% of December, with mostly cloudy or overcast conditions the remaining 10%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
19010
29010
39010
49010
59010
69010
7919
89010
99010
109010
119010
129010
139010
149010
159010
168911
178911
189010
199010
209010
219010
228911
238911
248911
258911
268911
278911
288911
298911
308911
318911

Chance of precipitation in December

Any precipitation

Sylhet gets around 12 mm of rain over 1.1 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 4% and peaks near 5% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
12
22
32
42
52
63
73
83
93
103
114
124
134
144
154
164
175
185
194
204
214
224
234
244
254
264
274
284
294
304
314

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the comfortable band about 52% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1750403
2753373
3855352
4956332
51057312
61158292
71259272
81360252
91461232
101661212
111860202
121961182
132161171
142360161
152658151
162857141
173056131
183354121
193553111
203852100
214050100
22424890
23454780
24474580
25484470
26504370
27524260
28544150
29544051
30554041
31573931

Wind in December

Winds average 3 km/h in December, the calmest month.

Across December, daily wind ranges from about 3 km/h on the calmest days to 3 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
13calm
23calm
33calm
43calm
53calm
63calm
73calm
83calm
93calm
103calm
113calm
123calm
133calm
143calm
153calm
163calm
173calm
183calm
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
273calm
283calm
293calm
303calm
313calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 36 min at the start of December to 10 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 6:25 AM to 6:41 AM, and sunset from 4:59 PM to 5:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.66:254:59
210.66:264:59
310.56:274:59
410.56:274:59
510.56:285:00
610.56:295:00
710.56:295:00
810.56:305:00
910.56:315:00
1010.56:315:01
1110.56:325:01
1210.56:335:01
1310.56:335:01
1410.56:345:02
1510.56:345:02
1610.56:355:03
1710.56:355:03
1810.56:365:03
1910.56:365:04
2010.56:375:04
2110.56:375:05
2210.56:385:05
2310.56:385:06
2410.56:395:06
2510.56:395:07
2610.56:405:07
2710.56:405:08
2810.56:405:08
2910.56:415:09
3010.56:415:09
3110.56:415:10

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.95 kWh/m².

For context, solar energy here swings from a low near 3.23 kWh/m² to a high of 5.31 kWh/m² in March across the year — December's 3.95 kWh/m² falls in the middle.

012345151015202531
Solar energy (kWh/m²)Level
14.0Bright
24.0Bright
34.0Bright
44.0Bright
54.0Bright
64.0Moderate
74.0Moderate
84.0Moderate
94.0Moderate
103.9Moderate
113.9Moderate
123.9Moderate
133.9Moderate
143.9Moderate
153.9Moderate
163.9Moderate
173.9Moderate
183.9Moderate
193.9Moderate
203.9Moderate
213.9Moderate
223.9Moderate
233.9Moderate
244.0Moderate
254.0Moderate
264.0Moderate
274.0Moderate
284.0Moderate
294.0Bright
304.0Bright
314.0Bright
Planning a trip in December

Hazard calendar for Sylhet

In seasonPeak

None of Sylhet's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Sylhet's monsoon runs April–September, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Sylhet?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

9.1
Sightseeing
1st-best month of the year
8.0
Beach & pool
2nd-best month of the year

December is one of the better times to visit Sylhet for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Sylhet in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Sylhet sees daytime highs around 25°C and nights near 13°C. Worth packing: light clothes.

light clothes

UV index in Sylhet in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sylhet peaks around July 21 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 17 at about 4 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highVery highExtremeHighJul 21UV 12Jan 17UV 4
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar8Very high
Apr7High
May8Very high
Jun6High
Jul12Extreme
Aug10Extreme
Sep11Extreme
Oct6High
Nov6High
Dec5Moderate

Air quality in Sylhet in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Sylhet is worst in January — around 100 µg/m³ PM2.5 (unhealthy), about 4.3× the cleanest month (July, 23 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Sylhet's WHO annual average of 59.8 µg/m³.

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyJan 2099 µg/m³Jul 1824 µg/m³
PM2.5 (µg/m³)Level
Jan100Unhealthy
Feb94Unhealthy
Mar95Unhealthy
Apr62Unhealthy
May44Poor
Jun32Moderate
Jul23Moderate
Aug30Moderate
Sep36Poor
Oct51Poor
Nov67Unhealthy
Dec83Unhealthy
Location & terrain

Where is Sylhet?

Sylhet sits at 24.9°N, 91.9°E, 26 m above sea level, in Bangladesh. The nearest listed city is Mymensingh, 149 km away.

MymensinghDhakaSamdrup JongkharRangpurChittagong

Topography around Sylhet

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sylhet.

Within 3 km, the terrain around Sylhet has only modest variations in elevation — a maximum elevation change of 55 m around an average of 19 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 82 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,953 m.

The land around Sylhet is covered by trees (52%) and artificial surfaces (41%) within 3 km, cropland (53%) and trees (39%) within 16 km, and trees (46%) and cropland (40%) within 80 km.

3 km
55 m
16 km
82 m
80 km
1,953 m
treesgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Mymensingh 149 km · Dhaka 199 km · Samdrup Jongkhar 215 km · Tamu 258 km · Mongar 272 km · Trashigang 273 km · Rangpur 280 km · Chittagong 285 km

Bangladesh travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type A / C / D / G
220 V · 50 Hz
Prices
≈ 25% of US
price level, 2025
GDP per capita
$2,597
2025
Happiness
4.3 / 10
World Happiness, 2025
Safe drinking water
59%
of population, 2024
Homicide rate
2.3
per 100k, 2018
Road deaths
15.3
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Moderate
EF EPI 506
Religion
Muslim 91%Hindu 8%other 1%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Sylhet (24.899°, 91.872°, elevation 26 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).