The peak and best season is the dry winter from November to February, with warm sunny days, cooler evenings and calm seas ideal for the beaches, though prices and crowds peak sharply around Christmas and New Year. October and March are pleasant shoulder months. April and May are very hot and humid, while the June-to-September monsoon brings heavy rain, rough seas and many shacks closed, though the countryside turns lush and green.
Rented scooters are the main travel risk in Goa. Roads can be narrow, potholed or sandy, traffic is fast, and accidents involving tourists are common. Always wear the helmet, carry your licence, drive slowly and defensively, and never ride after drinking or at speed on unfamiliar night roads.
The Arabian Sea has strong currents and sudden drop-offs, and drownings happen every season, often involving swimmers who go out too far or after alcohol. Swim only where there are lifeguards, obey red flags, take rip currents seriously, and keep a close eye on children in the water.
During the June-to-September monsoon the sea turns dangerous, many beach shacks close and swimming is often banned. Heavy rain can flood roads and make scooters treacherous. If you visit in the wet season, respect beach warnings and take extra care on two wheels.