Kerala has a **tropical monsoon climate**, though conditions vary by elevation and distance from the sea. Coastal areas are warm and humid through most of the year, while upland areas in the Western Ghats are significantly cooler.
**Köppen climate classification** in Kerala varies by subregion, but much of the state falls within **tropical monsoon (Am)** and **tropical rainforest (Af)** patterns, with highland areas showing cooler subtropical highland conditions locally.
## Seasonal pattern - **Summer:** Roughly March to May; hot, humid, and often with pre-monsoon thunderstorms. - **Southwest monsoon:** Usually June to September; the principal rainy season. - **Northeast monsoon/post-monsoon:** October to November; adds substantial rain, especially in southern districts. - **Winter:** December to February; generally the driest and most comfortable period, though still mild to warm.
## Typical conditions - **Coastal temperatures:** Often around 23–32°C through much of the year. - **Highland temperatures:** Can be much cooler, especially at night in hill stations such as Munnar. - **Rainfall:** Kerala is one of India's wetter states, but totals vary widely. Windward mountain slopes receive very heavy rainfall, while some eastern rain-shadow pockets receive less. - **Humidity:** High for much of the year, particularly along the coast and in lowland districts.
## Best time to visit - **December to February** is often considered the most comfortable period for general travel. - **Monsoon months** are popular for lush scenery and some wellness tourism, but heavy rain can disrupt transport. - **Hill stations** are attractive for cooler weather during warmer months.
## Weather risks - Flooding during intense monsoon periods - Landslides in highland districts - Coastal erosion and storm-related impacts in some areas - Localized heat stress outside the monsoon season
Exact statewide annual averages differ substantially by district and altitude, so statewide single-number summaries should be treated cautiously.