Kona By The Sea beach forecast: weather, water & waves
Kailua-Kona, HI · Hawaiʻi Island (Big Island), United States · 19.615, -155.983
Updated : very low seaweed, beach grade A, sea 80°F.
Also listed as Aston Kona By The Sea.
Veabird's call
Friday is best: A, little seaweed and 0% rain with 4.4 ft waves.
Manta ray night snorkel in Kona is a good call while Saturday crowds are Very busy.
Grades from Veabird's beach forecast; wording by AI (Muse Spark), checked against the forecast. Updated Nov 13, 06:00 UTC.
Tell me when Kona By The Sea grades A
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Questions about Kona By The Sea
Does Kona By The Sea get sargassum (seaweed)?
No. Atlantic sargassum does not reach Hawaii.
How warm is the water at Kona By The Sea?
About 80°F in November. The sea is warmest in August and September (about 82°F) and coolest in March (about 77°F).
When is the best time to visit Kona By The Sea?
For warm water and dry weather, aim for October through February. October is usually the quietest of those, with about 15 rainy days and a sea near 81°F.
When is hurricane season at Kona By The Sea, and how often do storms hit?
The central Pacific hurricane season runs June through November. A tropical storm passed within 86 miles of Kona By The Sea in 4 of the 55 seasons from 1971 to 2025, and a hurricane within 58 miles in 0. The riskiest stretch is around July 30, 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 Aston Kona By The Sea
Guests like Oceanfront views / beachfront location · Quiet, relaxing setting · Friendly and helpful staff (mention of Natalie) · Beautiful, well-kept grounds and daily pool/hot-tub maintenance
Watch for Some rooms dated and in need of updates · Moldy/odd smell reported in certain rooms · Beds described as too soft or incorrect bed size (king listed, queen provided) · Lack of adequate extra sleeping options (no pull-out / uncomfortable sofa)
- Cleanliness
7.0 - Service
9.5 - Location
9.5 - Room Quality
6.5 - Amenities
10.0 - Value for Money
8.0 - Food and Beverage
8.5 - Overall Experience
9.0
Read all 757 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 Kona By The Sea
Kona By The Sea sits outside the reach of the Atlantic sargassum belt; seaweed landings are rare in any month.
The Big Island month by month
Typical weather, water temperature, seaweed and crowds for every month: the best time to visit the Big Island.
Weather & water by month at Kona By The Sea
Average highs run from about 78°F in January and February to 83°F in August. The sea is warmest in August and September (about 82°F) and coolest in March (about 77°F). January and November are usually the driest, with about 11 rainy days each; June is the wettest, with about 23 rainy days.
| Month | Avg high | Sea | Rainy days |
|---|---|---|---|
| Jan | 78°F | 78°F | 11 |
| Feb | 78°F | 78°F | 12 |
| Mar | 79°F | 77°F | 17 |
| Apr | 79°F | 78°F | 18 |
| May | 80°F | 79°F | 20 |
| Jun | 80°F | 80°F | 23 |
| Jul | 82°F | 81°F | 19 |
| Aug | 83°F | 82°F | 18 |
| Sep | 82°F | 82°F | 17 |
| Oct | 82°F | 81°F | 15 |
| Nov | 81°F | 80°F | 11 |
| Dec | 80°F | 79°F | 12 |
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.
- Vog (volcanic haze) can affect air quality; check the Hawaiʻi Volcano Observatory.
- Hilo side is much wetter than the Kona–Kohala resort coast.
Check official advisories and local flags before swimming. Decomposing sargassum releases hydrogen sulfide; avoid heavy piles.
Things to do near Kailua-Kona, HI
- Hawaiʻi Volcanoes National Park
- Manta ray night snorkel (Kona)
- Kealakekua Bay
- Maunakea stargazing
- Punaluʻu black sand beach
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
- Kona Intl (KOA), ~15 km
- Hilo Intl (ITO), ~99 km
Nearby resorts
- Royal Sea Cliff Resort by Outrigger Kailua-Kona, HI · 1 km
- Kona Reef Resort Kailua-Kona, HI · 2 km
- Royal Kona Resort Kailua-Kona, HI · 2 km
- Kona Islander Inn & Hotel Kailua-Kona, HI · 3 km
- Holiday Inn Express & Suites Kailua-Kona Kailua-Kona, HI · 3 km
- Courtyard by Marriott King Kamehameha's Kona Beach Hotel Kailua-Kona, HI · 3 km
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