Kerala, being very close to equator, has a tropical climate. Kerala experiences heavy rains almost throughout the year, and is one of the wettest areas on the earth.
Kerala has three distinct seasons:
Summer lasts from from mid-February to mid-May. The tropical sun is really hot and temperatures can go up to 35°C in the afternoons.
The monsoon is in place from mid-May until early September. The North-East Monsoon winds bring heavy showers.
Winter is mild and lasts from about mid-October to early February. Heavy rains occur from the last week of September until until early November, due to the retreat of the South-East monsoon. There is no snow in Kerala, although it is quite cold and misty in the mountain regions.
When in Kerala, carry an umbrella no matter what time of the year it is. You can be caught in a sudden shower in summer which will leave you drenched if you are unprepared. The Kerala sun coupled with high rate of humidity can be unforgiving in the summer months.
The temperature averages around:
28°C – 34°C daytime, 24°C – 28°C at night in summer seasons of March, April
20°C – 28°C daytime, 18°C – 25°C at night for the rest of the year
Temperatures may drop down to 10°C or sometimes even little below during Winter seasons (November, December) in Hilly areas of Western ghats, especially at popular hill-stations like Munnar and Wynad etc, which results a misty days and freezing nights coupled with light cold showers. However in other places, the temperatures never drop below 15°C.
Recently summers have become hotter. Though the maximum temperature on summers has never risen higher than 36°C, the rising humidity has made recent summers difficult. The height of the Kerala summer is normally between mid-March and May. Wear only light loose cotton clothes during this season. Consider a trip to hilly areas where the temperatures never exceed 26°C.
Kerala experiences mild winds throughout most of the year.