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The India Meteorological Department (IMD) has flagged heavy rain across South Interior Karnataka today and tomorrow, September 21–22, 2026, affecting Bengaluru-origin weekend plans to Coorg, Chikkamagaluru, Hassan and Shivamogga. Expect squally winds and lightning windows that can disrupt ghat drives, waterfall stops and treks. Start earlier, plan buffer halts, and keep live nowcasts handy before committing to hill sections.
Monsoon impacts vary by terrain. Agumbe Ghat continues to restrict heavy vehicles until September 30 because of landslide risk, while dense fog recently slowed Charmadi traffic—use daylight and avoid quick photo halts on blind curves. Coastal belts will also see strong spells, so be flexible with pit stops and return legs. Keep an eye on brief, intense downpours around dusk.
Bengaluru ghat routes: Shiradi, Charmadi, Agumbe risk windows and detours
For Mangaluru or Udupi runs, Shiradi Ghat on National Highway 75 is the default, but alternate descents via Charmadi Ghat on National Highway 73 or the Mysuru–Madikeri–Sampaje corridor on National Highway 275 can help if slides or jams occur. Prioritise daylight driving, carry cashless toll options, and confirm local advisories before choosing your descent.
| Route | Typical monsoon triggers | Safer timing | Detour if needed |
|---|---|---|---|
| Shiradi (NH 75) | Fallen trees, slope slips | Late morning to afternoon | NH 275 via Mysuru–Madikeri |
| Charmadi (NH 73) | Dense fog, waterlogged bends | Post-sunrise hours | Shiradi or NH 275 |
| Agumbe (NH 169A) | Landslide-prone hairpins | Strictly daylight | Thirthahalli–Kundapur–Udupi |
Waterfalls, rafting and treks: safety windows and operator pauses
High inflows can prompt rafting halts and limit access near riverbanks. Dubare’s elephant camp reopened yesterday with stricter operating procedures, but river activities remain flow‑dependent. IMD Bengaluru’s city bulletin notes, “Light to moderate rain/thundershowers, heavy at times with gusty wind 40–50 kmph likely,” which can force quick shutdowns. Trekkers at Nandi, Skandagiri and Baba Budangiri should plan earlier exits and avoid exposed ridgelines during lightning.
Track short‑fuse weather using IMD’s district nowcast map and the Mausam mobile app; pair that with Karnataka’s KSNDMC dashboards and NDMA’s SACHET alerts. For lightning near hilltops, keep the Damini app active, descend below the crest, and wait 30 minutes after last thunder. For homestays, request reschedules when orange codes appear, and document alerts while negotiating changes.