Poipu Shores Resort beach forecast: weather, water & waves
Poʻipū, HI · Kauaʻi, United States · 21.871, -159.448
Updated : very low seaweed, beach grade B-, sea 80°F.
Also listed as Castle Po'ipū Shores.
Veabird's call
Monday is the pick: little seaweed.
Best months ahead: December (B+) and January (B+); seaweed is usually lowest in December.
Grades from Veabird's beach forecast. Updated Nov 13, 01:00 UTC.
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Questions about Poipu Shores Resort
Does Poipu Shores Resort get sargassum (seaweed)?
No. Atlantic sargassum does not reach Hawaii.
How warm is the water at Poipu Shores Resort?
About 80°F in November. The sea is warmest in September and October (about 81°F) and coolest in February, March and April (about 76°F).
When is the best time to visit Poipu Shores Resort?
For warm water and dry weather, aim for November through January. November is usually the quietest of those, with about 23 rainy days and a sea near 80°F.
When is hurricane season at Poipu Shores Resort, and how often do storms hit?
The central Pacific hurricane season runs June through November. A tropical storm passed within 86 miles of Poipu Shores Resort in 4 of the 55 seasons from 1971 to 2025, and a hurricane within 58 miles in 3. The riskiest stretch is around July 23, when the chance of a storm passing in any one week is about 1% or less; across all of August it is about 3%.
What guests say about Castle Po'ipū Shores
Guests like Great views · Responsive service
Watch for Cleanliness issues · Disappointing condition of unit
- Cleanliness
7.6 - Service
9.6 - Location
9.6 - Room Quality
8.6 - Amenities
8.6 - Value for Money
8.6 - Food and Beverage
9.1 - Overall Experience
9.1
Read all 107 reviews · Compare on Expedia
Scores and reviews come from guests who stayed, through LiteAPI (Nuitée). The likes, watch-fors and category scores are an AI summary of those reviews. Partner links: Veabird may earn a commission.
Sargassum season at Poipu Shores Resort
Poipu Shores Resort sits outside the reach of the Atlantic sargassum belt; seaweed landings are rare in any month.
Kauaʻi month by month
Typical weather, water temperature, seaweed and crowds for every month: the best time to visit Kauaʻi.
Weather & water by month at Poipu Shores Resort
Average highs run from about 76°F in February to 82°F in August and September. The sea is warmest in September and October (about 81°F) and coolest in February, March and April (about 76°F). January is usually the driest, with about 15 rainy days; July is the wettest, with about 29 rainy days.
| Month | Avg high | Sea | Rainy days |
|---|---|---|---|
| Jan | 77°F | 77°F | 15 |
| Feb | 76°F | 76°F | 18 |
| Mar | 77°F | 76°F | 23 |
| Apr | 77°F | 76°F | 26 |
| May | 78°F | 78°F | 28 |
| Jun | 80°F | 79°F | 26 |
| Jul | 81°F | 80°F | 29 |
| Aug | 82°F | 80°F | 27 |
| Sep | 82°F | 81°F | 25 |
| Oct | 81°F | 81°F | 24 |
| Nov | 79°F | 80°F | 23 |
| Dec | 78°F | 79°F | 20 |
Monthly averages from 6 years of ERA5 reanalysis (Open-Meteo) for this area's 0.5° grid cell; rainy days have at least 1 mm (0.04 in). Any given year can differ.
Cleanup & barriers
- Offshore barriers
- Not needed: Atlantic sargassum does not reach Hawaii.
- Public cleanup
- Volunteer groups (Sustainable Coastlines Hawaiʻi, Hawaiʻi Wildlife Fund) clear ocean plastic, heaviest on windward shores.
- Resort crews
- Resort crews groom beaches daily.
- Typical clearing time
- n/a
Safety notes
Domestic travel (no State Dept advisory)
- Winter swells (Nov–Mar) make north- and west-facing shores dangerous; summer swells hit south shores.
- Shorebreak and rip currents cause most visitor injuries: swim at lifeguarded beaches.
- Hawaiʻi bans sunscreens with oxybenzone and octinoxate.
- Stay 50 ft from monk seals and 10 ft from sea turtles.
- North shore (Hanalei, Princeville) is calm in summer and dangerous in winter; Poʻipū is the reverse.
- Flash floods close the Kūhiō Highway and Nā Pali trails after heavy rain.
Check official advisories and local flags before swimming. Decomposing sargassum releases hydrogen sulfide; avoid heavy piles.
Things to do near Poʻipū, HI
- Nā Pali Coast (boat or Kalalau Trail)
- Waimea Canyon
- Hanalei Bay
- Poʻipū beaches & Spouting Horn
- Wailua River kayak
Fly in for the best beach days
Suggested dates are a week in December. Change them to match the live forecast above.
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Nearest airports
- Līhuʻe (Kauaʻi) (LIH), ~16 km
Nearby resorts
- Marriott’s Waiohai Beach Club Poʻipū, HI · 1 km
- Grand Hyatt Kauai Resort Poʻipū, HI · 1 km
- Kiahuna Plantation Resort Poʻipū, HI · 1 km
- Sheraton Kauai Resort Poʻipū, HI · 2 km
- Koloa Landing Resort at Poipu Poʻipū, HI · 2 km
- Lawai Beach Resort Poʻipū, HI · 3 km
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