Weather in Iloilo in September

Shoulder season. September is shoulder season in Iloilo — cheaper, quieter, and a genuine gamble. You should expect rain on 26 days of the month, which is more days wet than dry.

September ranks 7 of 12 in Iloilo: past the worst of the year but short of February, which is the month to book if the dates are open.

Rain on 26 of the month's 30 days, 10 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: the day barely swings — 2 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 31.1 °C and the coldest night fell to 24.7 °C, and the wettest single day dropped 82 mm — roughly 29% 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 536 mm against 105 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 279 mm average is a reasonable planning figure, not a promise.

Wind is light at 12.4 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 28.6 °C.

How September sits in the year

Temperatures hold steady either side: 28.5 °C in August, 28.6 here, 29 in October. Nothing about the timing within the month matters much.

Daylight in September

Iloilo 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: 7.3 °C between the year's warmest afternoons and coldest nights.

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 Iloilo versus nearby

If Iloilo is one option among several, the nearby comparison is worth making. Cebu City is close enough to be a coin toss — within a degree on temperature, 2 days less rain. Cagayan de Oro 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 Iloilo

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