Meteo Dacca in gennaio

January sits inside the window the forum agrees on for Bangladesh — late October to early March — and calls the pleasant one: no heat, no humidity, roughly 25°C down to 15, though a late winter can arrive cold and foggy instead. The record broadly agrees, at 24°C and 13°C with almost no rain. The part the forum does not raise, and the record does: January is Dhaka's worst month of the year for air quality, averaging 170 against 46 in July. The dry, comfortable season and the smog season are the same months here, which is worth knowing before committing to a walking-heavy itinerary.

Bangladesh forum regulars are candid that June, right as the rainy season sets in after mid-June, brings weather that can be genuinely uncomfortable for anyone who struggles with heat and humidity - and getting around the country gets harder once the rains are in full swing. That said, several posters pushed back against writing the month off entirely: it doesn't rain all day, warm rain showers were described as a relief rather than a hardship by some, and June is peak mango season with Rajshahi's mango market cited as a highlight. The trade-off consistently mentioned: noticeably fewer tourists and a greener countryside than the more popular November-February window.

Forum posters describe August as squarely within Bangladesh's monsoon season, bringing a high likelihood of heavy rainfall, hot and humid conditions, and real flood risk in some rural areas, though posters are consistent that major cities and towns generally remain navigable despite the rain. Posters recommend staying current with forecasts and any travel advisories given the season's genuine unpredictability. Posters note that the rain does bring its own upside outside Dhaka itself - the Sundarban forest closes to multi-day tours for the season, but areas like Rangamati and Bandarban turn a lush, vivid green with especially clear lake water. Posters generally rate August as hot, wet and logistically demanding within Dhaka, workable with flexible planning around the daily rain.

Forum posters describe July as hot, humid and squarely within Bangladesh's monsoon rainy season, consistently recommending comfortable clothing plus a hat, sunscreen and water for anyone traveling this time of year. Posters are direct that July through September can be genuinely uncomfortable, with heat building even as cooling monsoon rain moves through and can shut down outdoor plans for a stretch. Posters do flag a real upside to the wet season, though: rain leaves areas like the Bandarban Hill Tracts, Sreemangal's tea country and the Sylhet and Barishal regions noticeably greener than at other times of year. Posters consistently name late October through early March as the better overall window for Bangladesh, but note hotels often discount heavily during the July heat and rain for visitors who go anyway.

Dhaka forum regulars call December genuinely one of the best months: very nice weather, not too hot and little chance of rain, sitting inside the broader late-October-to-early-March window regulars name as Bangladesh's prime travel season. The one regional wrinkle worth knowing beyond Dhaka itself: December-January count as “cold” by Cox's Bazar's beach-town standards (not genuinely cold weather, just cool enough to notice), which also makes it that coast's peak tourist season and its busiest month. Our record: 24.8°C days, 15°C nights, just 1.4 rain days and an AQI of 150 — mild and dry, matching the “best month, dry season” read, with the AQI figure being the one thing the pure weather praise leaves out entirely.