Kauaʻi weather
Kauaʻi Weather Today
Weather can be dramatically different around the island. Compare the areas you’re considering before heading out. Each forecast comes from that location’s own National Weather Service point and is never substituted from another region.
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Forecast details
All five visitor regions
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Why one side of Kauaʻi is wet and the other is dry
Kauaʻi sits in the trade winds. Moist air arriving from the northeast is pushed up the island’s mountains, cools, and drops much of its moisture on the North Shore and interior — the region around Mount Waiʻaleʻale is among the wettest places on Earth. By the time that air descends on the leeward side, it is drier, which is why Poʻipū and Waimea often stay sunny while Hanalei gets showers.
This is a broad pattern, not a guarantee. Storms can wet the entire island at once, and the drier side can see rain any day. The five forecasts above exist precisely because a single “Kauaʻi weather” number would mislead you.
Rain, and what it actually means for driving, hiking and the ocean
Much of Kauaʻi’s rain arrives as brief, localized showers — often overnight or in passing bands. But heavy or prolonged rain, especially on the North Shore, deserves real respect:
- Driving: heavy rain can flood low sections of road quickly, including Kūhiō Highway at the Hanalei Bridge. Never drive through flowing water. Check Hanalei Bridge and road conditions before heading north.
- Hiking: rain upstream can raise streams and waterfalls even when it is dry where you are standing. Never cross flowing water on foot, and check official park and trail notices before setting out.
- Ocean: heavy rain can send polluted runoff into streams and coastal water — a brown-water hazard even under clear skies. See ocean conditions and surf alerts and the Hawaiʻi Department of Health advisory system before entering the water.
A calm forecast is not a safety guarantee. Conditions change quickly, official alerts can be issued at any time, and lifeguards are the best on-the-ground source at guarded beaches.
The best months to visit Kauaʻi
There is no bad season — Kauaʻi is warm year-round — but the character of a visit changes through the year:
- April through October is generally the drier half of the year, and North Shore seas are usually calmer, opening up swimming and snorkeling that winter closes off.
- November through March is generally wetter and brings large north-facing surf — beautiful to watch, and a season when North Shore ocean conditions can become extremely hazardous. South-facing shores are usually the calmer option.
- Spring and fall often balance favorable weather with lighter crowds.
Any month can bring unusual conditions, so plan by the forecast and current alerts, not just the calendar.
Today on Kauaʻi
Daylight in Hawaiʻi Standard Time
Sunrise
6:42 AM HST
Sunset
6:00 PM HST
Locally calculated for central Kauaʻi. Clouds and terrain affect actual visibility; these are not safety times.
Common questions
Kauaʻi weather, answered plainly
What is the weather like on Kauaʻi right now?
It depends on which side of the island you are on. The forecasts on this page come from five separate National Weather Service point forecasts — Hanalei on the North Shore, Kapaʻa on the East Side, Līhuʻe, Kōloa/Poʻipū on the South Shore, and Waimea on the West Side — because conditions can differ meaningfully between them at the same moment.
Which side of Kauaʻi is rainier?
The North Shore and interior are generally wetter, especially around Hanalei and Mount Waiʻaleʻale, one of the wettest places on Earth. The South Shore (Poʻipū) and West Side (Waimea) are generally drier. These are broad patterns, not guarantees — rain can fall anywhere on any day.
Does rain on Kauaʻi mean the whole day is ruined?
Usually not. Much of Kauaʻi's rain arrives as brief, localized showers, and it can be raining in one town while another region is dry. Check the region-by-region forecast before changing plans, and remember that heavy or prolonged rain — especially on the North Shore — can raise streams and affect roads, trails and ocean water quality.
What are the best months to visit Kauaʻi?
There is no bad season, but the character changes. April through October is generally drier, with calmer seas on the North Shore. November through March is wetter and brings large north-facing surf. Spring and fall often balance weather and crowds. Any month can bring unusual conditions — check current forecasts and alerts rather than relying on the calendar.
Where does this weather data come from?
Forecasts are issued by the National Weather Service Honolulu office for five specific points on Kauaʻi, retrieved directly from the NWS API. Kauaʻi Insider never substitutes one region's forecast for another's. Active official alerts are shown separately from the forecast.
Where this data comes from
Forecasts are issued by the National Weather Service Honolulu office for five specific points on Kauaʻi and retrieved directly from the NWS API. Kauaʻi Insider never substitutes one region’s forecast for another’s, and never turns a forecast into a safety judgment. See our sources and method, today’s tides, and Kauaʻi right now for the full picture.