Sylhet Temperature by Month
The average annual maximum temperature in Sylhet, Bangladesh is 30°C (86°F), with daytime highs ranging from 25°C (77°F) in January to 33°C (91°F) in August. This page covers monthly averages, day-night differences, and how Sylhet compares to cities worldwide.
Sylhet Monthly Temperatures
Seasonal changes in Sylhet bring a little variety without extreme temperature swings. Nighttime lows range from 26°C (79°F) in August to 12°C (54°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Sylhet by month:
The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak.
The chart below shows the average temperature throughout the year:
Daily Historical Temperatures
42-year average (1977-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in June
Historical Sylhet Temperatures: 1976-2026
Browse day-by-day temperature records for Sylhet spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Sylhet vs Bangladesh
The map below shows the annual temperature across Bangladesh. You can also select individual months if you want to compare a specific time of year.
very warm
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pleasant
moderate
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Sylhet vs World: Temperature Compared
Sylhet's average annual maximum temperature is 30°C (86°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.
Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.
For more on Sylhet's weather — including monthly rainfall, sunshine hours, and humidity — visit our Sylhet climate page.
