Weather in Nakhon Ratchasima in September

A hard month. September is a hard month in Nakhon Ratchasima, and worth planning around. You should expect rain on 24 days of the month, which is more days wet than dry.

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

Rain on 24 of the month's 30 days, 9 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. Natural fibres and a second shirt for the day. At 87% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 14 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest September day reached 32.9 °C and the coldest night fell to 20.5 °C, and the wettest single day dropped 83 mm — roughly 31% of the month's rain in one day.

September is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest September on record still delivered 441 mm against 166 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 271 mm average is a reasonable planning figure, not a promise.

Wind is light at 6.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity at 87% is the real story though — it is the number that decides how the day feels, not the 29.8 °C.

How September sits in the year

Temperatures hold steady either side: 30.7 °C in August, 29.8 here, 29.6 in October. Nothing about the timing within the month matters much. Rain is the thing that moves: October brings 8 days less of it, so pushing the dates later buys drier weather.

Daylight in September

Nakhon Ratchasima sits close enough to the equator that daylight barely moves all year — 12.2 hours in September, against a range of just 1.8 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: 18.7 °C between the year's warmest afternoons and coldest nights.

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 Nakhon Ratchasima versus nearby

If Nakhon Ratchasima is one option among several, the nearby comparison is worth making. Lat Krabang is close enough to be a coin toss — within a degree on temperature, 2 days more rain. Bangkok is close enough to be a coin toss — within a degree on temperature, 3 days more rain.

So: September is a compromise. December is 43 points better and is what Nakhon Ratchasima 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 Nakhon Ratchasima

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