Sylhet weather in June
June in Sylhet: sweltering, soaked, with muggy air — not the time — 29 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#12 of 12 months in Sylhet · #1324 of 1413 destinations to visit in June · comfort 34/100 (tier F)
- Days
- 30°C
- Nights
- 25°C
- Wet days
- 29
- Sun
- 5.7 h
- Humidity
- 89%
- Daylight
- 14 h

Traveller notes on Sylhet in June
Other months in Sylhet
Forum posters describe July as squarely within Bangladesh's monsoon, with constant rain throughout the month and heat that makes getting around genuinely uncomfortable between downpours. Posters are direct that despite this, June through September counts as high season for some of Sylhet's signature natural attractions specifically because of the rain - Bisnakandi is recommended for exactly July and August, and the Ratargul Swamp Forest, one of the few swamp forests in Asia, is best visited by boat during the May-to-October monsoon precisely because the rising water lets you glide directly among the trees. Posters generally frame the constant rain as the trade-off for seeing these flooded-forest and waterfall attractions at their most dramatic. Posters generally rate July as heavily monsoon-affected and physically demanding for general travel in Sylhet, but genuinely rewarding for visitors specifically prioritizing its wetland and waterfall attractions at their peak.
Forum posters place late October through early March as Bangladesh's best general travel window, putting January squarely inside it. For the Sylhet tea gardens specifically, posters note there's a lean period from the third week of December through the second week of March when no tea is harvested - this is pruning season, so January visitors see far less picking activity and less vivid green than during the main harvest months, though the gardens, tea-worker villages and nearby tribal villages remain open and worth visiting regardless.
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Sylhet climate normals — June
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Sylhet in June
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Quietschool holidays in 3 of the markets that fill it, one of its worst months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Sylhet's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherSylhet's weather peaks December–February, best around January.
June coincides with Flash-flood season.
Best weatherFair weatherToughest weather
What's on in Sylhet in June
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Hazard
Flash-flood season
15 May – 30 Sep · usuallyClosuresThe Surma and Kushiyara rivers regularly burst their banks between May and September: the 2022 flood submerged most of Sylhet and neighbouring Sunamganj district, shut the airport and railway station, and displaced close to half a million people. Smaller flash floods recur most years. Source ↗
- Nature
Ratargul submerged
1 Jun – 30 Sep · usuallyMonsoonBangladesh's only freshwater swamp forest floods to 15-20 feet during the monsoon, turning the trees into a paddled maze reachable only by small wooden boat. Outside these four months the water drops and much of the forest floor is walkable clay. Source ↗
- Season
Wet season
MonsoonRisk29 rainy days and about 864 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Where is Sylhet?
Sylhet in June — FAQ
- Is June a good time to visit Sylhet?
- June in Sylhet: sweltering, soaked, with muggy air — not the time — 29 rainy days. It ranks #12 of 12 months for Sylhet on SeasonMap's comfort score (34/100).
- What is the weather like in Sylhet in June?
- In June, Sylhet averages a daily high of 30.2°C and a low of 25°C, with about 864 mm of rain over roughly 29.1 rainy days.
- What is the air quality in Sylhet in June?
- Sylhet has a mean US Air Quality Index of about 84 in June.