Sylhet weather in August

In August, Sylhet sees average daytime highs of 31°C and overnight lows near 26°C, with 733 mm of rain across 30.7 wet days and about 12.9 hours of daylight. It is the 1st-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 2% of the time in August, and the air most often feels miserable.

Daylight stretches from about 13 h 12 min at the start of August to 12 h 30 min by month's end. Set against the rest of the year, August is Sylhet's 11th-clearest and 4th-windiest month. For the whole year in context, see Sylhet's year-round climate.

Daytime high
31°
1st warmest
Overnight low
26°
12th coldest
Rainfall
733 mm
30.7 wet days
Daylight
12 h 54 min
5:30 AM – 6:23 PM
Cloud cover
92%
11th clearest
Wind
4 km/h
4th windiest
Solar energy
3.49 kWh/m²
Travel score
2.3
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 August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical August day in Sylhet reaches about 31°C in the afternoon and slips back to 26°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 33°C. Set against its neighbours, August runs on par with July and on par with September.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13126
23126
33126
43126
53126
63126
73126
83126
93126
103126
113126
123126
133126
143126
153126
163126
173126
183126
193126
203126
213126
223126
233126
243126
253126
263125
273125
283125
293125
303125
313125

How August really feels in Sylhet

Once humidity and wind are folded in, August averages 31 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
31
10 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Sylhet weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 4th-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 August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 3% of August, with mostly cloudy or overcast conditions the remaining 95%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1397
2397
3397
4496
5496
6496
7496
8496
9496
10496
11496
12397
13496
14496
15496
16496
17595
18595
19595
20595
21595
22595
23694
24694
25793
26793
27793
28991
29991
30991
31991

Chance of precipitation in August

Any precipitation

Sylhet gets around 733 mm of rain over 30.7 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 99% and peaks near 99% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
199
299
399
499
599
699
799
899
999
1099
1199
1299
1399
1499
1599
1699
1799
1899
1999
2099
2199
2299
2399
2499
2599
2699
2799
2898
2998
3098
3198

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the miserable band about 100% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
1298
2199
3199
4199
5199
6199
7199
8199
9199
100100
110100
120100
130100
140100
150100
160100
170100
180100
190100
200100
210100
220100
230100
240100
250100
260100
270100
280100
290100
300100
310100

Wind in August

Winds average 4 km/h in August.

Across August, daily wind ranges from about 4 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 12 min at the start of August to 12 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over August. Sunrise moves from 5:23 AM to 5:36 AM, and sunset from 6:34 PM to 6:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.25:236:34
213.25:246:33
313.15:246:33
413.15:256:32
513.15:256:31
613.15:266:31
713.15:266:30
813.05:276:29
913.05:276:28
1013.05:286:28
1113.05:286:27
1213.05:296:26
1312.95:296:25
1412.95:296:25
1512.95:306:24
1612.95:306:23
1712.95:316:22
1812.85:316:21
1912.85:326:20
2012.85:326:19
2112.85:326:18
2212.75:336:18
2312.75:336:17
2412.75:346:16
2512.75:346:15
2612.75:356:14
2712.65:356:13
2812.65:356:12
2912.65:366:11
3012.65:366:10
3112.55:366:09

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 3.49 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 — August's 3.49 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.6Moderate
23.6Moderate
33.6Moderate
43.6Moderate
53.6Moderate
63.5Moderate
73.5Moderate
83.5Moderate
93.5Moderate
103.5Moderate
113.5Moderate
123.5Moderate
133.5Moderate
143.4Moderate
153.4Moderate
163.4Moderate
173.4Moderate
183.4Moderate
193.5Moderate
203.5Moderate
213.5Moderate
223.5Moderate
233.5Moderate
243.5Moderate
253.5Moderate
263.5Moderate
273.5Moderate
283.5Moderate
293.5Moderate
303.5Moderate
313.5Moderate
Planning a trip in August

Hazard calendar for Sylhet

In seasonPeak

In August, Sylhet sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

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 August a good time to visit Sylhet?

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

2.3
Sightseeing
11th-best month of the year
3.4
Beach & pool
12th-best month of the year

August is a weaker month for outdoor sightseeing in Sylhet.

What to pack for Sylhet in August

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

In August, Sylhet sees daytime highs around 31°C and nights near 26°C. Pack light clothes and rain gear. About 31 days see rain.

light clothesrain gear

UV index in Sylhet in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 10 (very high — sun protection essential). 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 August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August 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
August 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).