Kauai Weather Forecast
Kauai weather: 73°F, heavy drizzle. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Will it rain in Kauai?
Yes - rain is likely in Kauai today.
A 100% chance means rain is expected over most of the area. Plan indoor alternatives. Around 0,7 in is forecast, which is enough to soak trails and slow traffic.
Over the next 7 days, about 6,7 in of precipitation is forecast, with the wettest days falling on Fri, Sat, Sun, Mon, Tue, Wed and Thu.
The next 7 days carry about 3.7 times a normal week's rain for September (6,7 in against 1,8 in).
16-day forecast for Kauai
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Fri, Sep 18 | 🌦️ Light showers | 75° / 66° | 100% · 0,7 in | 6 mph | 7 |
| Sat, Sep 19 | 🌦️ Light showers | 70° / 67° | 100% · 0,9 in | 6 mph | 7 |
| Sun, Sep 20 | 🌦️ Light showers | 74° / 66° | 98% · 0,5 in | 7 mph | 8 |
| Mon, Sep 21 | 🌦️ Drizzle | 75° / 65° | 54% · 0,2 in | 7 mph | 8 |
| Tue, Sep 22 | 🌦️ Drizzle | 74° / 63° | 82% · 0,3 in | 5 mph | 8 |
| Wed, Sep 23 | 🌧️ Heavy drizzle | 71° / 67° | 77% · 0,8 in | 5 mph | 5 |
| Thu, Sep 24 | ⛈️ Violent showers | 69° / 67° | 87% · 3,4 in | 4 mph | 7 |
| Fri, Sep 25 | ⛈️ Violent showers | 72° / 66° | 97% · 3,3 in | 7 mph | 9 |
| Sat, Sep 26 | 🌦️ Drizzle | 73° / 65° | 86% · 0,5 in | 8 mph | 8 |
| Sun, Sep 27 | 🌦️ Light showers | 70° / 64° | 94% · 0,7 in | 6 mph | 6 |
| Mon, Sep 28 | 🌦️ Light showers | 68° / 63° | 85% · 0,9 in | 5 mph | 7 |
| Tue, Sep 29 | 🌦️ Drizzle | 73° / 63° | 77% · 0,4 in | 6 mph | 6 |
| Wed, Sep 30 | 🌦️ Drizzle | 70° / 61° | 86% · 0,4 in | 6 mph | 8 |
| Thu, Oct 1 | 🌦️ Light showers | 67° / 60° | 80% · 0,6 in | 6 mph | 8 |
| Fri, Oct 2 | ☁️ Overcast | 73° / 59° | 76% | 6 mph | 7 |
| Sat, Oct 3 | 🌦️ Light drizzle | 76° / 62° | 37% · 0,1 in | 7 mph | 7 |
What this means for Kauai
Today is about average for September. The forecast high of 75°F is in line with the 74°F typical for this month.
A 100% chance means rain is expected over most of the area. Plan indoor alternatives. Around 0,7 in is forecast, which is enough to soak trails and slow traffic.
Visibility is down to 0,1 mi - use low beams and leave extra following distance. Wet roads are likely; braking distances roughly double in heavy rain.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 39°F - an unusually even climate through the year.
What to pack, what to skip
- A packable rain shell - 7 of the next 7 days carry a real chance of rain
- If your dates are flexible, avoid March, November and December - historically the least comfortable months here.
See the Kauai forecast by time range
Kauai weather - more answers
Explore Kauai
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Frequently asked questions
Where is Kauai?
Kauai is an island in Hawaii. Its coordinates are 22.0964, -159.5261. It lies in North America.
What is the weather like in Kauai right now?
It is currently 73°F (23°C) with heavy drizzle. Humidity is 83% and wind is 5 mph.
When is the best time to visit Kauai?
August, September and October offer the most comfortable conditions in Kauai, which has a temperate climate. March, November and December are usually the hardest months for outdoor plans.
What time zone is Kauai in?
Kauai observes Pacific/Honolulu (UTC-10:00). The local time is 3:32 AM.
What is the nearest airport to Kauai?
The closest airports are Daniel K. Inouye International Airport (HNL), 116 mi away.
What are the top things to do in Kauai?
Popular options include Hanalei Bay, Oahu, Pearl Harbor National Memorial, Waikiki Beach, Maui and Haleakala National Park.
What places are in Kauai?
Kauai covers 1 places in this atlas, including Hanalei Bay.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (islands) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weather Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated September 19, 2026 at 3:32 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
