Kauai Weather Forecast for September 19, 2026
Published · Updated
Cited: Kauai Now, Kauai Now, Kauai Now
TL;DR
Kauai will see a drier, breezy Saturday with isolated showers, followed by a potential increase in moisture from remnants of Tropical Depression 15-E by midweek.
Why now
The remnants of former Tropical Cyclone Norbert are exiting, but a new moisture surge from Tropical Depression 15-E is expected to arrive by Tuesday, potentially bringing enhanced showers.
Agree / conflict
Forecast models are in general agreement on the midweek moisture surge, though timing and intensity may vary.
Takeaway
Expect a mostly dry weekend, but stay updated for possible heavy rain and thunderstorms starting Tuesday.
Kauai is set for a drier, breezy Saturday as the remnants of former Tropical Cyclone Norbert exit the region. Trade winds will persist through the weekend, with isolated showers mainly over windward and mountain areas. A Flood Watch remains in effect through Friday morning, and a Small Craft Advisory is posted for surrounding waters.
Looking ahead, moisture from the remnants of Tropical Depression 15-E is expected to arrive by Tuesday, potentially bringing enhanced showers and thunderstorms through Thursday. Surf along south-facing shores will remain above average through the weekend, while north-facing shores stay flat. Fire weather risk will stay low due to recent rainfall and moderate winds.
FAQ
What is the weather forecast for Kauai on September 19, 2026?
Expect a breezy, mostly sunny day with isolated showers, especially over windward and mountain areas. Highs will range from 73 to 92°F near the shore, with lows between 60 and 81°F.
Are there any weather advisories in effect for Kauai?
A Flood Watch is in effect through Friday morning, and a Small Craft Advisory is posted for surrounding waters, including the Alenuihaha Channel and Big Island leeward waters.
Will there be thunderstorms on Kauai?
A slight chance of thunderstorms exists, mainly over the Big Island and potentially over windward areas, but confidence is low. The forecast currently mentions isolated thunderstorms only in the mountains.
What is the surf forecast for Kauai?
South-facing shores will see above-average surf through the weekend, with a south-southwest swell peaking Saturday. East-facing shores will have moderate surf, while north-facing shores remain flat to tiny.
When will the next significant weather system affect Kauai?
Moisture from the remnants of Tropical Depression 15-E is expected to arrive by Tuesday, potentially bringing enhanced showers and thunderstorms through Thursday.
Sources
Canonical URL: /trend/2026/kauai-weather-forecast-for-september-19-2026
Disclaimer
Digests summarize public sources. They are not advice, forecasts, or a complete record of every trend.
This digest was compiled by Yanuki using publicly available data and trending information. The content may summarize or reference third-party sources that have not been independently verified. While we aim to provide timely and accurate insights, the information presented may be incomplete or outdated.
All content is provided for general informational purposes only and does not constitute financial, legal, or professional advice. Yanuki makes no representations or warranties regarding the reliability or completeness of the information.
This digest may include links to external sources for further context. These links are provided for convenience only and do not imply endorsement.
Always do your own research (DYOR) before making any decisions based on the information presented.