After-Rain Advisory Picker

Heading to a Hawaii beach after rain?

Choose your island, rain timing, and beach area for precautions and current advisory links. This picker cannot tell you when the water is safe.

Quick answer

Avoid water contact during and after heavy rain.

Stay out of brown or murky water even without a posted advisory. Rain timing, sunshine, and clear-looking water do not establish water quality. Avoid stream mouths, drainage canals, and storm drains.

Check current DOH advisories for the exact beach. An active advisory remains in effect until DOH lifts it; no posted advisory does not mean the water was tested or found safe.

1 Which island?

2 When did it last rain heavily?

Choose what you know. Rain uphill can affect the coast even when the beach is sunny; these answers do not measure water quality.

3 Where on the island are you?

What rain timing can tell you

A calendar cannot clear the water.

Rain can carry polluted runoff to the ocean. Conditions vary by beach and event, so this tool provides no recovery countdown. A sunny beach can still receive runoff from rain uphill.

Use these checks alongside the current notice for your exact beach:

Heavy rain or runoff? Avoid water contact during and after heavy rain, including near stream mouths and drainage outlets.
Brown or murky water? Stay out even if no advisory is posted. Clear-looking water is not a water-quality test.
An active advisory? Follow its location and instructions until DOH lifts it.
A dry coast, reef, or lagoon? Geography does not establish water quality or make another beach a safe alternative.

Source: Hawaii DOH Beach Monitoring Program, reviewed September 17, 2026. If conditions or advisory information are uncertain, stay out.

Live data & deeper context

Hawaii Water Quality Forecast — 14-day trend + NOAA 7-day outlook

Live →

Swimming After Rain in Hawaii — Full Guide

Guide →

Brown Water Advisories — current notices by island

Guide →

Beach Geography & Brown Water — context and current advisories

Guide →

Hawaii Beach Comparison — check each beach’s current status

Live →

Share this tool

Pinterest Facebook X / Twitter

Get Island Advisory Updates

Choose an island for grouped emails about new and cleared DOH advisories. Daily water-quality reports remain available on this website. Free — unsubscribe anytime.

⚠️ Important Disclaimer

This tool provides after-rain precautions and DOH advisory links. It is not a real-time water quality measurement and cannot estimate when a beach has recovered. Check the exact location and scope of current notices.

Always verify current water quality conditions with the Hawaii Department of Health Clean Water Branch before entering the water.

This site does not recommend or advise anyone to swim at any beach. We share government data and geographic analysis so you can make your own informed decisions. By using this tool you accept full responsibility for your own safety. See our Terms of Use for full details.

When in doubt, don’t go out.