Grand Naniloa Hotel beach forecast: weather, water & waves
Hilo, HI · Hawaiʻi Island (Big Island), United States · 19.730, -155.065
Updated : very low seaweed, beach grade B-, sea 80°F.
Also listed as Grand Naniloa Hotel, a Doubletree by Hilton.
Veabird's call
Tuesday grades B+ with little seaweed and 80F water despite 8.7 ft waves.
January and October grade B+, and Hawaiʻi Volcanoes National Park is close.
Grades from Veabird's beach forecast; wording by AI (Muse Spark), checked against the forecast. Updated Nov 13, 01:00 UTC.
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Questions about Grand Naniloa Hotel
Does Grand Naniloa Hotel get sargassum (seaweed)?
No. Atlantic sargassum does not reach Hawaii.
How warm is the water at Grand Naniloa Hotel?
About 79°F in November. The sea is warmest in July, August, September and October (about 80°F) and coolest in February, March and April (about 76°F).
When is the best time to visit Grand Naniloa Hotel?
For warm water and dry weather, aim for October through February. October is usually the quietest of those, with about 20 rainy days and a sea near 80°F.
When is hurricane season at Grand Naniloa Hotel, and how often do storms hit?
The central Pacific hurricane season runs June through November. A tropical storm passed within 86 miles of Grand Naniloa Hotel in 5 of the 55 seasons from 1971 to 2025, and a hurricane within 58 miles in 0. The riskiest stretch is around August 6, when the chance of a storm passing in any one week is about 1% or less; across all of August it is about 4%.
What guests say about Grand Naniloa Hotel, a Doubletree by Hilton
Guests like Great location · Spacious rooms
Watch for Poor cleanliness · Unhelpful service
- Cleanliness
5.8 - Service
7.8 - Location
9.3 - Room Quality
7.8 - Amenities
8.3 - Value for Money
6.8 - Food and Beverage
6.8 - Overall Experience
7.3
Read all 635 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 Grand Naniloa Hotel
Grand Naniloa Hotel 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 Grand Naniloa Hotel
Average highs run from about 76°F in February to 82°F in August, September and October. The sea is warmest in July, August, September and October (about 80°F) and coolest in February, March and April (about 76°F). January is usually the driest, with about 15 rainy days; May is the wettest, with about 27 rainy days.
| Month | Avg high | Sea | Rainy days |
|---|---|---|---|
| Jan | 78°F | 77°F | 15 |
| Feb | 76°F | 76°F | 20 |
| Mar | 77°F | 76°F | 23 |
| Apr | 77°F | 76°F | 24 |
| May | 78°F | 77°F | 27 |
| Jun | 80°F | 79°F | 23 |
| Jul | 81°F | 80°F | 26 |
| Aug | 82°F | 80°F | 26 |
| Sep | 82°F | 80°F | 24 |
| Oct | 82°F | 80°F | 20 |
| Nov | 79°F | 79°F | 22 |
| Dec | 78°F | 78°F | 18 |
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 Hilo, 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
- Hilo Intl (ITO), ~2 km
- Kona Intl (KOA), ~103 km
Nearby resorts
- SCP Hotel Hilo, HI · 1 km
- Hilo Beach House Inn Hilo, HI · 3 km
- Kalani Retreat Center Puna, HI · 39 km
- Mauna Kea Beach Resort Kohala Coast, HI · 85 km
- Fairmont Orchid Waikoloa, HI · 87 km
- Mauna Lani Bay Resort Waikoloa, HI · 87 km
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