SeasonMapChittagong weather in September
Bangladesh
September in Chittagong: hot, soaked, with clean air — not the time — 25 rainy days.
#10 of 12 months in Chittagong · #1295 of 1383 destinations to visit in September · comfort 43/100 (tier F)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Chittagong in September
No notes yet. Open Chittagong on the map to add the first one.
Chittagong climate normals — September
| Daytime high | 30°C / 85°F | 🥵 hot |
|---|---|---|
| Nighttime low | 26°C / 79°F | |
| Sea temperature | 30°C / 87°F | ♨️ bath-warm |
| Rainfall | 342 mm / 13.5 in | ⛈ soaked |
| Rainy days | 25 days | |
| Humidity | 87% | 💦 very humid |
| Dew point | 25°C / 77°F | |
| Sunshine | 8.5 h/day | |
| Daylight | 12.3 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 49 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Chittagong in September
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 Chittagong'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 weatherChittagong's weather peaks December–February, best around January.
Best weatherFair weatherToughest weather
What's on in Chittagong in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Wet season
MonsoonRisk25 rainy days and about 342 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Where is Chittagong?
Chittagong in September — FAQ
- Is September a good time to visit Chittagong?
- September in Chittagong: hot, soaked, with clean air — not the time — 25 rainy days. It ranks #10 of 12 months for Chittagong on SeasonMap's comfort score (43/100).
- What is the weather like in Chittagong in September?
- In September, Chittagong averages a daily high of 29.7°C and a low of 25.9°C, with about 341.9 mm of rain over roughly 25.4 rainy days.
- What is the air quality in Chittagong in September?
- Chittagong has a mean US Air Quality Index of about 49 in September.