Weather in Munnar in September

A good month. September works. It is not the peak, but nothing about it fights you. You should expect rain on 21 days of the month, which is more days wet than dry.

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

Rain on 21 of the month's 30 days, 8 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. 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: it never really gets hot: not one day in an average September reaches 30 °C; the day barely swings — 5.4 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 24.7 °C and the coldest night fell to 12 °C, and the wettest single day dropped 71 mm — roughly 31% of the month's rain in one day.

September is moderately variable: 44 mm in the driest year against 412 mm in the wettest, around an average of 228 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 1.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 91%, high enough to notice on the warm days without dominating them.

How September sits in the year

Temperatures hold steady either side: 19.9 °C in August, 20.6 here, 21.1 in October. Nothing about the timing within the month matters much.

Daylight in September

Munnar sits close enough to the equator that daylight barely moves all year — 12.2 hours in September, against a range of just 1.2 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: 16.5 °C between the year's warmest afternoons and coldest nights. At 1470 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

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

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

September in Munnar versus nearby

If Munnar is one option among several, the nearby comparison is worth making. Teni is the weaker option in September — 11.1 °C warmer, 3 days less rain. Coimbatore is the weaker option in September — 8.7 °C warmer, 1 day less rain.

So: September is a compromise. January is 32 points better and is what Munnar 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 Munnar

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