Seasons
Kovalam has a classic tropical monsoon climate with three distinct periods for visitors.
November to February is the prime season. The northeast monsoon brings light, cool breezes, the sea is calm and clear, swimming is easy, and the beaches are at their best. This is also the most crowded and expensive period — guesthouses fill up, restaurants are busy, and prices can be double the off-season rates. Christmas and New Year bring particularly dense crowds from both domestic and foreign tourists.
March to May is shoulder season. The weather is hot and increasingly humid, but the sea remains swimmable and prices drop. March and April are good months if you want the beach without peak crowds. By May the heat and humidity are significant, and the first pre-monsoon showers begin.
June to October is the southwest monsoon. This is not a beach holiday — the heavy rains make swimming dangerous, waves consume the beaches entirely at times, and many of the smaller guesthouses close. Kovalam empties out almost completely. The upside is that Ayurvedic practitioners consider the monsoon the optimal season for treatment — the body is said to be more receptive during the rains — and several of the better clinics run monsoon-specific programmes for serious practitioners at reduced rates.
Onam, the Kerala harvest festival celebrated in August or September depending on the lunar calendar, is a major local event that fills Thiruvananthapuram with colour. It is worth timing a visit to Kerala around, though Kovalam itself will be deep in monsoon at that point.