Weather in Bengaluru in September

Shoulder season. September is shoulder season in Bengaluru — cheaper, quieter, and a genuine gamble. You should expect rain on 18 days of the month, which is more days wet than dry.

September ranks 9 of 12 in Bengaluru: past the worst of the year but short of December, which is the month to book if the dates are open.

Rain on 18 days, 5 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: 6 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest September day reached 33.4 °C and the coldest night fell to 15.8 °C, and the wettest single day dropped 57 mm — roughly 38% of the month's rain in one day.

September is moderately variable: 34 mm in the driest year against 270 mm in the wettest, around an average of 151 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 10.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 80%, high enough to notice on the warm days without dominating them.

How September sits in the year

Temperatures hold steady either side: 28 °C in August, 27.8 here, 27.1 in October. Nothing about the timing within the month matters much.

Daylight in September

Bengaluru sits close enough to the equator that daylight barely moves all year — 12.2 hours in September, against a range of just 1.5 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

An inland climate

Despite being inland, the year stays fairly even: 21.1 °C between the year's warmest afternoons and coldest nights. At 920 m the air is thin enough to matter — sun that burns faster than the temperature suggests, and nights that cool off quickly.

How busy it gets

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

September in Bengaluru versus nearby

If Bengaluru is one option among several, the nearby comparison is worth making. Mysuru is close enough to be a coin toss — within a degree on temperature, 2 days more rain. Kallakurichi is the weaker option in September — 5.8 °C warmer, 1 day less rain.

So: September is a compromise. December is 34 points better and is what Bengaluru is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Bengaluru

See all twelve months in Bengaluru, or where else to go in September.