Why surf coastal Karnataka this October — the season read
El Niño, a likely positive IOD, and freshly rebuilt sandbars: the odds tilt toward a proper Sept–Oct window at Mulki and Udupi this year.
A tentative read of the odds, not a forecast — nobody can predict actual waves beyond ~10 days. This is loaded dice, not a promise. The window: mid-September to end-October. Confirm at T-minus 10 days.
Last year was the down year
Two seasons ago the swells at Mulki and Udupi were solid — bigger, more consistent. Last season (Dec–Feb) they dropped: smaller, patchier, and the sandbars sat oddly far out, so waves broke ahead of the usual spot. That was a La Niña / neutral-year fingerprint — not the coast going bad.
- La Niña / neutral Pacific
- Swells dropped — small, inconsistent Dec–Feb
- Bars pushed out — waves broke way ahead
- Year before was noticeably bigger
- Strong El Niño + likely positive IOD
- Odds tilt back toward proper swell
- Bars likely closer in, breaking right
- Best window: mid-Sept to end-Oct
This year the climate dice flip
A strong El Niño is building, with a positive Indian Ocean Dipole likely behind it — warm water parked on our side of the ocean. Historically that combo nudges Southern Ocean storms closer to us and fires up the Arabian Sea in Oct–Nov.
- SW monsoon (Jun–Sep): forecast below normal — less sand dragged offshore, bars closer in.
- Arabian Sea (Oct–Nov): +IOD years skew active — bonus swell events possible, with some cyclone-disruption risk.
The mechanism, in one line: El Niño in austral summer → SAM leans negative → the Southern Ocean storm track shifts equatorward → more long-period S/SW groundswell into the Arabian Sea. Weak correlation, not a law.
The bars should fix themselves
El Niño usually means a weaker monsoon, so less sand gets dragged offshore — bars sit closer in and break properly again. And right after the monsoon, the Mulki rivermouth banks are freshly rebuilt and at their cleanest shape of the whole year.
- Near-normal monsoon dragged sand offshore
- Outer bar — waves broke far out, ahead of where they should
- Weaker monsoon = less offshore sand transport
- Rivermouth banks freshly rebuilt — their best-defined shape of the year in Sept–Oct
October is the window — December is its own thing
Mid-Sept to end-Oct keeps the leftover monsoon swell (chest to overhead) while the winds swing offshore in the mornings and the water clears. October is the only time you get size and shape together. December is every bit as good in its own way — smaller, but groomed, glassy, long-period walls. Punch in October, polish in winter. Pick your flavour.
| Mid-Sept – Oct | Dec – Feb | |
|---|---|---|
| Wave face | 1.5–2.5 m · chest–overhead | 0.8–1.5 m · waist–chest |
| Period | 8–12 s monsoon-tail windswell, occasional 14 s+ pulses | 12–18 s Southern Ocean groundswell — unhurried, well-spaced sets |
| Direction | W–SW (240–270°) — hits the coast straight on | S–SW (190–220°) — wraps in softer |
| Morning wind | Light/variable, going offshore (NE–E) through Oct | Reliable NE–E offshore till ~10–11 am, 5–10 kt |
| Water + crowd | 27–29 °C · murky early, clearing · quiet lineups | 28–29 °C · clean and glassy · peak-season crowd at Mulki |
| Sandbars | Freshly rebuilt — best-defined banks of the year | Worn-in and mellow — softer by Jan–Feb, friendlier to longboards |
The honest caveat — and the playbook
Nobody can forecast actual waves beyond ~10 days. Check INCOIS / Windy 10 days out before locking travel, and keep an eye on Arabian Sea cyclones: one can gift us a bonus swell or wreck a week.
What to look for, 10 days out: