October in Karaikal is when the northeast monsoon arrives — the rain pattern that defines the Cauvery delta year. The NE monsoon onset typically falls around October 20 (deviation up to a week either side); rainfall jumps to 250-300mm across 14-18 wet days, often as 3-4 day spells with rare longer dry breaks. Daytime 25-30C, humidity at 85 percent. Bay of Bengal cyclone risk peaks in late October — Karaikal-Nagapattinam-Velankanni stretch has a documented history of direct landfall (Cyclone Ditwah late November 2025 missed Karaikal by 80km but flooded the delta; the November 2021 floods red-alerted Karaikal for a week). Pilgrim flow at Thirunallar holds; Saturday queues thin to 12,000-18,000 on rainy days. Hotel rates run at year-low (40 percent below January). The NE monsoon hammer is the trade-off; for clean Coromandel weather, December is the proper return.

Why October scores 4.0/10