Weather in Quito

September is the warmest month (average 18.8°C, high 24.9°C) and January is the coolest (average 18.0°C, low 13.7°C). That 0.8°C swing in monthly averages is the first thing to plan around in Quito.

Rain is wet season runs from December to May, inside an annual total of 1180 mm. The wettest month is April at 177 mm; the driest is August at 25 mm. Quito is in Ecuador at 0.2°S. The 2001–2020 NASA POWER daily record describes a mild oceanic climate. On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are July, August, and September.

When the score favours a visit

The three months with the highest comfort score are July, August, and September: July (18.3°C average, 34 mm, 77% humidity); August (18.6°C average, 25 mm, 74% humidity); September (18.8°C average, 38 mm, 75% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the wet season itself — fewer crowds, greener landscape, heavier rain — aim at December–May instead of the score.

Temperature through the year

Quito has a 0.8°C gap between its coolest monthly average (18.0°C in January) and its warmest (18.8°C in September). That is a southern-hemisphere pattern.

Across the year the mean afternoon high is 23.3°C. If you want the smallest day–night shock, look at months where the high and low sit close together; September nights still hold 12.6°C.

Rain through the year

The wet season in Quito starts in December and ends in May (December, January, February, March, April, and May). April is the core of it at 177 mm. August is the other extreme, with 25 mm.

Humidity peaks near 86%. That usually lines up with the wetter months rather than the hottest ones.

The calendar in Quito

The year bottoms out in January. Plan for 13.7°C at night and 22.3°C in the afternoon. April is the wettest month — 177 mm and 25 rainy days, with 86% humidity. By May the wet season is ending. Quito still sees about 123 mm, but the next month is usually leaner.

June stands apart from the months beside it: 24.0°C / 12.8°C and 58 mm. August is the driest month, averaging only 25 mm across 6 rainy days. Highs sit near 25.1°C. Peak heat arrives in September: 24.9°C by day, 12.6°C at night, and 75% humidity.

Quito and other cities in Ecuador

Guayaquil is about 266 km away: Quito is 10.5°C cooler than Guayaquil in its hottest month and 410 mm wetter over the year than Guayaquil. Guayaquil’s wettest month is February (215 mm) versus April here.