What is the best weather month on Block Island?

September. The ocean holds its summer warmth after Labor Day while the crowds leave, and clear stretches run well into the month. July and August are warmest; September is best.

Is Block Island foggy?

Regularly, in June and early July especially. Morning fog usually burns off by midday. It delays boats more often than it ruins days.

What should I pack for the weather?

A windbreaker in any month — the sea breeze is constant, and evenings drop fast once the sun goes down. Sunscreen from May through September; the water reflection burns people who think they don’t burn.

On-island

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Weather

Block Island weather, live and by the month

Current conditions straight from the island's airport station, and the month-by-month truth about a maritime climate that plays by its own rules.

Right now on-island

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Air temp

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Wind

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Visibility

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Sky

Source: National Weather Service, Block Island State Airport (KBID). If the numbers above are blank, the station feed is down — the NWS point forecast is the fallback.

The next few days

Forecast loads with the live feed; when it doesn't, use the NWS link above.

The month-by-month honest version

Thirteen miles of open Atlantic in every direction does two things: it keeps summer highs milder than the mainland's, and it keeps spring cold long after Providence has put the parkas away. The ocean is the thermostat here, and it runs about six weeks behind the calendar.

Month	Typical air	The honest note
January – February	Mid-30s, wind-chilled	The quiet season. Reduced ferries, most businesses closed, the island to yourself.
March – April	40s–50s	Slow spring. Trails wake up in April; water still in the 40s.
May	55–65°	Underrated. Green island, no crowds. Water too cold to swim, perfect to bike.
June	60s–low 70s	The island comes back to life. Fog some mornings; water climbing toward the 60s.
July	Mid-70s	Peak everything. Ocean around 70°. Book ahead for July 4th week — everything.
August	Up to low 80s	Warmest water of the year, low 70s. Busiest month by far.
September	60s–70s	The local favorite: summer water, no lines. If you can pick, pick this.
October	50s–60 on good days	Gold light, amber bluffs. Businesses start closing late in the month.
November – December	Cold, windy	Off-season proper. Solitude and raw Atlantic weather for those who want it.

Ranges are typical, not records — the live box above always wins an argument with the table.

The fog thing

Fog is a fact of island life, thickest in June and early July. It rolls in dense enough to swallow the ferry horn and is usually gone by lunch. Plan around it two ways: don't stake a trip on sunrise photos in June, and don't book the last possible boat home on a foggy-season Sunday if missing it would matter on Monday.

Utility pages

Tide chart — today's tides and how to read the island's swings.
Marine forecast — Block Island Sound conditions for boaters and anglers.
Webcams — see the island right now before you commit the day.
The packing list — layers. It's always layers.

Good questions

What is the best weather month on Block Island?: September. The ocean holds its summer warmth after Labor Day while the crowds leave, and clear stretches run well into the month. July and August are warmest; September is best.
Is Block Island foggy?: Regularly, in June and early July especially. Morning fog usually burns off by midday. It delays boats more often than it ruins days.
What should I pack for the weather?: A windbreaker in any month — the sea breeze is constant, and evenings drop fast once the sun goes down. Sunscreen from May through September; the water reflection burns people who think they don’t burn.