Weather in Kota Kuala Muda in September

A hard month. September asks something of you. Go in knowing what. You should expect rain on 27 days of the month, which is more days wet than dry.

September ranks 5 of 12 in Kota Kuala Muda: past the worst of the year but short of February, which is the month to book if the dates are open.

Rain on 27 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. Natural fibres and a second shirt for the day. At 85% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 16 days top 30 °C — hot spells arrive, but they break; the day barely swings — 4.9 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 33.2 °C and the coldest night fell to 23.1 °C, and the wettest single day dropped 79 mm — roughly 32% 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 385 mm against 148 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 249 mm average is a reasonable planning figure, not a promise.

Wind is light at 4.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity at 85% is the real story though — it is the number that decides how the day feels, not the 30.1 °C.

How September sits in the year

Temperatures hold steady either side: 30.2 °C in August, 30.1 here, 30 in October. Nothing about the timing within the month matters much.

Daylight in September

Kota Kuala Muda sits close enough to the equator that daylight barely moves all year — 12.2 hours in September, against a range of just 0.6 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 29.7 °C in September — warm enough that the water offers no relief from the heat. The sea peaks at 30.5 °C in May and bottoms out at 28.9 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

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 Kota Kuala Muda versus nearby

If Kota Kuala Muda is one option among several, the nearby comparison is worth making. Ipoh is close enough to be a coin toss — within a degree on temperature, 3 days less rain. Hat Yai is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: September works, with February the better month by 14 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Kota Kuala Muda

See all twelve months in Kota Kuala Muda, or where else to go in September.