Surfing Periscopes: The Complete Guide

Periscopes is a reef break located in East Sumbawa, Indonesia, offering a right-hander along Southeast Asia's tropical lineups. Periscopes is a long, rippable right reef break in East Sumbawa that produces tight barrels over a safe reef platform. Rated as advanced difficulty with lightly crowded conditions, this reef break is a worthy destination for surfers looking beyond the usual suspects.

Best Conditions

Swell Direction: The ideal swell direction is SSW (205°), with workable conditions from S to SW (190°–220°). Swells outside this window will either miss the break or produce disorganized waves.

Swell Size: Periscopes needs a minimum of 0.9m / 3ft to start working and handles swells up to 2.4m / 8ft before conditions deteriorate.

Swell Period: Look for a swell period of at least 10 seconds, with 14 seconds being the sweet spot. Longer periods deliver more organized, powerful waves with better shape.

Wind: True offshore here blows from the N (0°). The full offshore range spans NNW to NNE (330°–30°). Glassy conditions under 4km/h from any direction also produce excellent surf. Plan for early morning dawn patrol sessions.

Tide: This spot works best at high tide. Optimal tide range is 1m–2m.

When to Go

Primary Season: The prime window at Periscopes runs April, May, June, July, August, September, October (Apr–Oct). This is when swell consistency and direction align most reliably with the break.

Secondary Season: A secondary window opens November, December, January, February, March (Nov–Mar). While not as consistent, patient surfers can still score quality sessions during this period.

Season Notes: Best Apr-Oct (dry season, SE trades offshore). Swells year-round but wet season brings onshore winds.

Water Temperature: Expect water temperatures around 28°C / 82°F. Boardshorts or a thin rashguard are all you need.

Getting There

The nearest airport is BMU, roughly 30 minutes by car.

Hazards & Tips

Known Hazards:

🌀 Strong rips — Dangerous currents
🪸 Sharp reef — Shallow reef, booties recommended

Safety Tips:

Wear reef booties to protect your feet from sharp coral and rock
Study the currents before paddling out. Know your exit strategy

Skill Level: This spot is rated advanced (6/10). Crowd Level: Typically lightly crowded (4/10).

Check the Live Forecast

Planning a session at Periscopes? Check the live forecast on Strike Mission to see today's conditions and the 10-day outlook. Our Strike Score algorithm rates this spot from 0 to 100 every day, factoring in swell direction, size, period, wind, and tide — so you know exactly when to paddle out.

Don't leave your next surf trip to chance. Let the data tell you when Periscopes is firing.

*Conditions data sourced from Strike Mission's verified spot database.*