Climate guide for Kauai, United States

Best Time to Visit
Kauai

How to read the score (0–10)
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01 · United States

About Kauai

Kauai's Na Pali coast can be seen by boat, helicopter or the demanding Kalalau trail, and Waimea canyon cuts red rock through the island's west. The Wailua river, Hanalei bay and the north shore's beaches fill the days, and the island's rainfall keeps it lush. May to September is the driest season; winter brings bigger surf on the north shore, and the island stays green year-round.

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Did you know?

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Travel Tips

01Best time & timing
Climate scores swing from 7.9/10 in December to 9.8/10 in June; the safest picks are June, July, August.
02Weather & what to pack
Expect around 25°C and 13 mm of rain in June, with roughly 30 bright days. Pack light clothing, swimwear and strong sun protection.
03Crowds & value
Peak-season pricing concentrates in June. For better value, April scores 9.5/10 at lower-season rates.

Things to do in Kauai

Kauai, United States. Live activities and tours from GetYourGuide, matched to this destination.

When to visit Kauai: the short answer

The best time to visit Kauai is June, followed by July, August. Those months combine the most usable temperatures with the fewest lost days to rain: June averages 25°C with 13 mm of rain and about 30 days with 6+ hours of sunshine. The months to avoid unless you have a specific reason are December, January. If budget matters more than perfect weather, February is the strongest of the low-rate months at 8.5/10.

Across the year Kauai swings from 23°C in February to 27°C in September, a 4-degree spread, while rainfall ranges from 13 mm in June to 70 mm in February. That is the whole planning problem in one sentence: Kauai is not equally good year-round, and the difference between the best and worst month here is 1.9 points on a 10-point scale.

Warmest month: September (27°C). Coolest: February (23°C). Driest: June (13 mm). Wettest: February (70 mm).

Kauai month by month

January in Kauai: strong conditions, 11th of 12

Good · 8.2/10

January averages 24°C (74°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.

Rainfall runs 56 mm, so plan one flexible day in three; you still get about 15 days with 6+ hours of sunshine and 10.8 hours of daylight.

It scores 8.2/10 here, 11th of 12 months, against 9.8/10 in the destination's best month.

Figure on mid-season pricing, with crowds are light for this destination.

Pack light clothing, swimwear and real sun protection, a packable rain layer.

Flexible dates? June scores 1.6 points higher here — enough to change the trip.

February is one of the strongest months in Kauai (10th)

Best window · 8.5/10

February averages 23°C (74°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.

Rainfall runs 70 mm, so plan one flexible day in three; you still get about 19 days with 6+ hours of sunshine and 11.2 hours of daylight.

A 8.5/10 puts this among the year's best months in Kauai (10th of 12); only June scores higher, at 9.8/10.

Figure on low-season pricing, with crowds are light for this destination.

Pack light clothing, swimwear and real sun protection, a packable rain layer.

March in Kauai — one of the year's strongest windows (8th)

Best window · 9.2/10

With 24°C (74°F) on average, March delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.

Budget for roughly 59 mm of rain this month — a flexible day or two helps — with about 27 days with 6+ hours of sunshine and 11.8 hours of daylight to work around it.

On our climate-comfort scale this is one of the strongest months of the year for Kauai at 9.2/10 (8th of 12), just behind June at 9.8/10.

Expect mid-season pricing, and crowds are moderate.

Pack light clothing, swimwear and real sun protection, a packable rain layer.

April is one of the strongest months in Kauai (6th)

Best window · 9.5/10

April averages 24°C (75°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.

Expect 44 mm of rain — occasional showers rather than washed-out days — alongside about 28 days with 6+ hours of sunshine and 12.5 daylight hours.

A 9.5/10 puts this among the year's best months in Kauai (6th of 12); only June scores higher, at 9.8/10.

Plan for mid-season pricing, with crowds are moderate.

Pack light clothing, swimwear and real sun protection.

May ranks 7th of 12 for Kauai — one of the best windows

Best window · 9.4/10

With 25°C (76°F) on average, May delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.

Budget for roughly 48 mm of rain this month — a flexible day or two helps — with about 31 days with 6+ hours of sunshine and 13.1 hours of daylight to work around it.

On our climate-comfort scale this is one of the strongest months of the year for Kauai at 9.4/10 (7th of 12), just behind June at 9.8/10.

Budget for mid-season pricing, and crowds are moderate.

Pack light clothing, swimwear and real sun protection, a packable rain layer.

June in Kauai — the year's strongest window

Best window · 9.8/10

June averages 25°C (78°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.

Rain is a non-issue at 13 mm for the month, with about 30 days with 6+ hours of sunshine and 13.3 hours of daylight to work with.

On our climate-comfort scale this is the top-ranked month of the year for Kauai at 9.8/10 — the reference point every other month on this page is measured against.

Plan for peak pricing, with crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.

Pack light clothing, swimwear and real sun protection.

July ranks 2nd of 12 for Kauai — one of the best windows

Best window · 9.8/10

July averages 26°C (78°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.

Expect 15 mm of rain — occasional showers rather than washed-out days — alongside about 31 days with 6+ hours of sunshine and 13.2 daylight hours.

A 9.8/10 puts this among the year's best months in Kauai (2nd of 12); only June scores higher, at 9.8/10.

Figure on peak pricing, with this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.

Pack light clothing, swimwear and real sun protection.

August is one of the strongest months in Kauai (3rd)

Best window · 9.8/10

Days in August average 27°C (80°F) and humidity near 75% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.

With around 17 mm of rain, any showers tend to pass through rather than settle in; about 31 days with 6+ hours of sunshine and 12.8 hours of daylight fill the rest.

On our climate-comfort scale this is one of the strongest months of the year for Kauai at 9.8/10 (3rd of 12), just behind June at 9.8/10.

Budget for peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.

September ranks 4th of 12 for Kauai — one of the best windows

Best window · 9.8/10

Days in September average 27°C (80°F) and humidity near 75% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.

With around 19 mm of rain, any showers tend to pass through rather than settle in; about 30 days with 6+ hours of sunshine and 12.1 hours of daylight fill the rest.

On our climate-comfort scale this is one of the strongest months of the year for Kauai at 9.8/10 (4th of 12), just behind June at 9.8/10.

Expect peak pricing, and crowds are moderate.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.

October ranks 5th of 12 for Kauai — one of the best windows

Best window · 9.7/10

October averages 26°C (80°F) and humidity near 75%, so the practical pattern is early mornings, a long midday break, and evenings back outside.

Expect 29 mm of rain — occasional showers rather than washed-out days — alongside about 23 days with 6+ hours of sunshine and 11.5 daylight hours.

A 9.7/10 puts this among the year's best months in Kauai (5th of 12); only June scores higher, at 9.8/10.

Plan for peak pricing, with crowds are moderate.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.

November is one of the strongest months in Kauai (9th)

Best window · 8.7/10

November averages 25°C (78°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.

Expect 37 mm of rain — occasional showers rather than washed-out days — alongside about 16 days with 6+ hours of sunshine and 10.9 daylight hours.

A 8.7/10 puts this among the year's best months in Kauai (9th of 12); only June scores higher, at 9.8/10.

Figure on mid-season pricing, with crowds are moderate.

Pack light clothing, swimwear and real sun protection.

December holds up well in Kauai — 12th best month

Good · 7.9/10

With 24°C (76°F) on average, December delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.

Budget for roughly 58 mm of rain this month — a flexible day or two helps — with about 13 days with 6+ hours of sunshine and 10.7 hours of daylight to work around it.

That is 7.9/10 on the same scale — 12th of 12 months, versus 9.8/10 for the best month here.

Expect low-season pricing, and crowds are light for this destination.

Pack light clothing, swimwear and real sun protection, a packable rain layer.

If your dates are flexible, June is materially better in Kauai — 1.9 points higher on the same scale.

FAQ

Frequently asked

When is the best time to visit Kauai, United States?
In Ideal Weather mode, the best months to visit Kauai are June, July, August, September, October, April. June is the single peak month with an Ideal Weather score of 9.8/10 based on temperature, rainfall, humidity, daylight and days with 6+ hours of sunshine.
What is the weather like in Kauai year-round?
Kauai has a climate profile suited to beach and coastal travel. Average monthly temperatures range from 23°C in February to 27°C in September, with Ideal Weather scores between 7.9 and 9.8 out of 10.
Which months should I avoid in Kauai?
The lowest Ideal Weather-scoring months in Kauai are December (7.9/10), January (8.2/10), February (8.5/10). These months typically combine less comfortable temperatures, higher rainfall or fewer days with 6+ hours of sunshine.
When is the rainy season in Kauai?
February is the wettest month in Kauai, averaging about 70 mm of rainfall. June is the driest, at roughly 13 mm.
Which is the sunniest month in Kauai?
May sees the most sun in Kauai, with about 31 days with 6+ hours of sunshine on average - ideal for outdoor plans.
Is Kauai a good destination for beach and coastal travel?
Kauai is well suited to beach and coastal travel. Its highest Ideal Weather window (June, July, August, September, October, April) aligns with the conditions travelers usually look for in this style of trip.
How is the bestime.to score for Kauai calculated?
Each month receives an Ideal Weather score from 0-10 using ERA5 climate normals for Kauai: temperature comfort, precipitation, humidity, daylight hours, and days with 6+ hours of sunshine - weighted for beach and coastal travel.

Climate data: Open-Meteo ERA5 historical archive, the five most recent complete years (2021–2025). Scores are monthly averages for that window, not forecasts, and short-window precipitation can differ from longer-term normals. “Sunny days” count days with at least 6 hours of measured sunshine — they are not dry days.

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