Should you go to Po Toi Island tomorrow?

Do not rely only on the forecast you saw the night before. HKO operates a nowcasting system that uses radar and automatic weather-station data to support rainfall forecasts in the vicinity of Hong Kong a few hours ahead . If, before you leave, broad rain areas appear to be moving toward Hong Kong, it is not a good day to put yourself somewhere with limited retreat options.

3. Ferry and return flexibility

When the weather is on the edge, the ferry timetable matters. Check the same-day sailing arrangements before you set off, and decide in advance what the earliest acceptable return would be. Avoid planning a day where the last or very late sailing is your only realistic way out. If the sky starts to worsen, you want enough time to get back to the pier and wait safely.

The green-amber-red rule

Green: go, but keep it light

Po Toi is reasonable only if all of these are true:

• No thunderstorm, rainstorm, tropical cyclone or relevant severe-weather warning is in force before you leave.
• Radar and short-term rainfall information do not show widespread rain moving in.
• You have confirmed the ferry plan and are comfortable adjusting the day around it.
• Your goal is a short walk, sea views, photos and a simple stop — not a full hiking day.

Even on a green day, do not treat it as a guaranteed all-day outing. A safer version is a half-day trip: start near the pier, watch the sky, then take only easy-to-retrace sections. If clouds thicken, rain picks up or you hear thunder, cut the route short.

Amber: keep the island feel, but choose somewhere easier to shorten

If the morning is already gloomy, rain areas are nearby, or showers look likely, Po Toi should become optional rather than essential. Consider a more flexible outlying-island plan, such as a short near-pier visit to Cheung Chau, Peng Chau or Lamma. If the rain risk looks more active, move the day into town: a harbourfront stroll between showers, a café, a mall or a museum.

The point of an amber plan is not that the alternative will be rain-free. It is that you can shorten it, pause it or switch indoors more easily. Po Toi’s best experience depends heavily on open coastal conditions, so it is rarely worth forcing in borderline weather.

Red: cancel Po Toi

Do not set off for Po Toi if any of these apply:

• A thunderstorm, rainstorm, tropical cyclone or other severe-weather warning is in force.
• Radar shows a large rain area moving toward Hong Kong.
• Immediate conditions suggest squally thunderstorms, heavier rain or worsening visibility.
• Ferry arrangements are unclear, or your return options are too tight.
• Your group includes children, older travellers, or anyone who should avoid wet paths, exposed coastal areas or long waits at a pier.

On a red day, there is no need to wait until heavy rain actually arrives. HKO warnings can cover the impending occurrence of severe weather, normally within about four hours . For an island day trip, changing plans early is usually more sensible than retreating late.

If you still go, plan the day this way

Treat Po Toi as a short, flexible outing rather than a full expedition.

• Before leaving: check HKO warnings, radar and short-term rainfall information one last time, then confirm the ferry plan .
• On arrival: stay near the pier at first, drink water, eat something simple and reassess the sky before walking farther.
• Route choice: keep to short sections and places that are easy to turn back from; do not add distance unless conditions clearly improve.
• Stop early if needed: return to a safer waiting area if rain intensifies, thunder is heard, lightning appears or dark cloud approaches.
• Come back earlier than necessary: build in waiting time for the ferry and avoid being caught between worsening weather and a missed sailing.

The safest backup plan

Have two backups ready before the morning decision:

1. Flexible island version: Cheung Chau, Peng Chau or Lamma, limited to near-pier walking, food and photos.
2. Urban rain-plan version: a short harbourfront walk if there is a dry spell, then cafés, malls or museums as conditions change.

That way, if the weather suddenly looks better, Po Toi can stay in play. If warnings, radar or ferries look unfavourable, you still have a day that works.

Final call

Tomorrow is not an automatic no for Po Toi Island, but it is not a day to gamble on. HKO has already flagged a more unsettled background pattern for southern China in the first week of May 2026 . The real threshold should be the situation just before departure: warnings, radar, short-term rainfall information and ferry flexibility . If all of those are green, do the short version. If any one turns against you, save Po Toi for a more settled day.