Weather in Cali in September

Shoulder season. September sits in between. You will get good days and you will lose some. Highs average 31.3 °C, lows 20.9 °C, and rain falls on 11 days — nothing in the month is working against you.

September ranks 4 of 12 in Cali: past the worst of the year but short of August, which is the month to book if the dates are open.

Rain on 11 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 31.3 °C days and 20.9 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 23 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest September day reached 35.3 °C and the coldest night fell to 17.5 °C, and the wettest single day dropped 31 mm — roughly 60% 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 95 mm against 24 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 52 mm average is a reasonable planning figure, not a promise.

Wind is light at 5.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 79%, high enough to notice on the warm days without dominating them.

How September sits in the year

Temperatures hold steady either side: 31.2 °C in August, 31.3 here, 30.1 in October. Nothing about the timing within the month matters much. Rain is the thing that moves: October brings 9 days more of it, so the earlier half of a flexible trip is the safer half.

Daylight in September

Cali sits close enough to the equator that daylight barely moves all year — 12.1 hours in September, against a range of just 0.4 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: 10.8 °C between the year's warmest afternoons and coldest nights. At 758 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

Busy. Popular without being frantic; book the things you care about, improvise the rest.

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

September in Cali versus nearby

If Cali is one option among several, the nearby comparison is worth making. Bogotá is close enough to be a coin toss — 11.6 °C cooler, 7 days more rain. Medellín is close enough to be a coin toss — 6.4 °C cooler, 14 days more rain.

So: September is effectively as good as it gets here — 5 points behind August, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Cali

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