Weather

Sunniest National Parks

By Highlight · February 2026

Blue skies as a near-guarantee. These parks average 85% or more sunshine year-round, with some topping 3,900 annual sunshine hours. The Caribbean, Hawaii, and desert Southwest dominate this list. Pack sunscreen and expect clear conditions almost every day you visit.

How We Ranked These

Sunshine Intensity

We measured solar energy reaching each park's surface, which captures true sunshine better than simple cloud-cover estimates. Parks where the sun hits hardest and most consistently score highest.

Clear Sky Frequency

We counted the number of days per year with strong, unobstructed sunshine. This separates parks with reliably clear skies from those where occasional sunny breaks inflate the averages.

Year-Round Consistency

Some parks are sunny in summer but overcast in winter. We scored across the full year so parks with reliable sunshine in every season rank above those with one bright season and three cloudy ones.

Multiple Climate Sources

Mainland parks, Hawaiian volcanoes, and Caribbean islands all use high-resolution climate data matched to their geography. We didn't rely on a single weather station; we sampled conditions across each park's actual footprint.

10.
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Highlight’s Favorite: Castle Mountains
National Monument · California
Castle Mountains scores near the top of this list, and it’s our favorite sunny park.
A remote Mojave monument with 88% annual sunshine, dense Joshua tree forests, and the ruins of a gold mining operation that pulled ore from these hills for over a century. The Hart Mine district operated until the 1990s. The monument was designated in 2016, and almost nobody visits.
Castle Mountains sits at the edge of the Mojave where California meets Nevada, high desert grassland too remote for casual tourists and too recently designated for anyone to have it on their list yet. The sunshine is relentless, the stargazing after dark is exceptional, and the Joshua tree forest here is among the densest in existence. Most parks on the sunniest list are places people already know: Death Valley, Joshua Tree, the Sonoran monuments. Castle Mountains is the one the sun hasn’t put on the map yet.
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9.
92
Pu'uhonua O Honaunau
National Historical Park · Hawaii
The Kona Coast's dry side delivers 86% sunshine to this sacred Hawaiian refuge. Ancient Hawaiians chose well: the consistent sun and lack of rain create conditions where history endures. Royal grounds and carved ki'i images bask in nearly 3,830 annual sun hours, sheltered from the trade wind rains by the bulk of Mauna Loa.
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8.
93
Channel Islands
National Park · California
California's Mediterranean climate delivers 86% sunshine and over 3,820 annual sun hours. The Pacific keeps temperatures mild while the lack of clouds ensures clear conditions for wildlife watching. Marine mammals, seabirds, and endemic plants thrive under the consistent coastal sun that draws visitors from foggy mainland shores.
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7.
96
Dry Tortugas
National Park · Florida
Seventy miles from Key West, Fort Jefferson bakes under 86% annual sunshine. Nearly 3,820 sun hours per year illuminate the massive hexagonal fortress and the crystal waters surrounding it. The remote location means no shade except what the fort itself provides; the reward is some of the clearest skies in Florida.
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6.
96
Kalaupapa
National Historical Park · Hawaii
Molokai's remote peninsula sees 89% sunshine annually, more than almost anywhere in the park system. The former leprosy settlement sits in a rain shadow below sea cliffs that catch the trade winds. While the rest of Hawaii's windward coasts get drenched, Kalaupapa stays dry and sunny under nearly 3,960 sun hours per year.
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5.
98
Buck Island Reef
National Monument · U.S. Virgin Islands
The underwater trail through elkhorn coral formations gets nearly 3,935 hours of sunlight per year, among the highest in the park system. At 89% annual sunshine, clouds rarely interfere with a day on the water. The uninhabited island sits in one of the most reliably sunny corners of the Caribbean.
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4.
99
Virgin Islands Coral Reef
National Monument · U.S. Virgin Islands
Underwater visibility depends on surface conditions, and 89% sunshine means exceptional clarity year-round. The coral formations and marine life benefit from consistent light penetration, and snorkelers benefit from warm, clear days. Nearly 3,925 sunshine hours per year make any dive date a good one.
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3.
99
Haleakala
National Park · Hawaii
Above the clouds on Maui's massive volcano, the summit averages 88% sunshine and nearly 3,900 annual sun hours. Trade wind inversions keep the clouds below the crater rim, creating a landscape of stark volcanic terrain under intense high-altitude sun. The coastal Kipahulu section sees more clouds and rain; the summit is another world entirely.
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2.
100
Salt River Bay
National Historical Park and Ecological Preserve · U.S. Virgin Islands
St. Croix matches the sunshine of St. John at 89% annually. The mangrove forests and coral reefs see clear tropical light almost every day, making underwater visibility exceptional. Where Columbus first made contact with indigenous people in 1493, the same sun beats down today on kayakers exploring the bay's ecological diversity.
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1.
100
Virgin Islands
National Park · U.S. Virgin Islands
Caribbean sunshine at 89% annually, with nearly 3,930 hours of sun per year. St. John bakes under clear tropical skies for most of the year, with trade winds keeping temperatures tolerable. The white sand beaches and crystal waters exist because so little rain falls to cloud the scene. Afternoon clouds occasionally build over the hills, but morning sun is as reliable as the tides.
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