Weather in Coimbatore

Rain is the monsoon runs from May to November, inside an annual total of 1143 mm. The wettest month is October at 192 mm; the driest is January at 6 mm.

Coimbatore is in India at 11.0°N. The 2001–2020 NASA POWER daily record describes a monsoon climate with a sharp wet-dry split. April is the warmest month (average 29.2°C, high 35.3°C) and December is the coolest (average 22.7°C, low 17.3°C). On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are December, January, and February.

Monsoon and dry months

The monsoon in Coimbatore starts in May and ends in November (May, June, July, August, September, October, and November). October is the core of it at 192 mm. January is the other extreme, with 6 mm.

Humidity peaks near 85%. That usually lines up with the wetter months rather than the hottest ones.

Temperature through the year

Monthly average highs run from 28.0°C in December to 35.3°C in April. Nights follow the same curve: 17.3°C in December and 23.0°C in April.

Across the year the mean afternoon high is 30.3°C. If you want the smallest day–night shock, look at months where the high and low sit close together; April nights still hold 23.0°C.

The calendar in Coimbatore

January is the driest month, averaging only 6 mm across 1 rainy days. Highs sit near 30.5°C. April is the warmest month. Afternoon highs average 35.3°C and nights settle near 23.0°C, with 60 mm of rain. The monsoon opens in May. Expect 118 mm and 19 rainy days, with nights around 22.8°C.

October is the wettest month — 192 mm and 22 rainy days, with 85% humidity. November closes the monsoon: 118 mm over 16 rainy days, then the calendar dries. The year bottoms out in December. Plan for 17.3°C at night and 28.0°C in the afternoon.

When the score favours a visit

The three months with the highest comfort score are December, January, and February: December (22.7°C average, 28 mm, 79% humidity); January (23.7°C average, 6 mm, 67% humidity); February (25.9°C average, 9 mm, 56% humidity). Those months sit across the year end, so they are listed in season order rather than January-to-December. 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 monsoon itself — fewer crowds, greener landscape, heavier rain — aim at May–November instead of the score.

Coimbatore and other cities in India

Bengaluru is about 229 km away: Coimbatore is 0.6°C warmer than Bengaluru in its hottest month and 300 mm wetter over the year than Bengaluru. Bengaluru’s wettest month is September (151 mm) versus October here.

Chennai is about 428 km away: Coimbatore is 2.9°C cooler than Chennai in its hottest month and 110 mm drier over the year than Chennai. Chennai’s wettest month is November (292 mm) versus October here.

Hyderabad is about 727 km away: Coimbatore is 4.3°C cooler than Hyderabad in its hottest month and 335 mm wetter over the year than Hyderabad. Hyderabad’s wettest month is August (190 mm) versus October here.