Can I swim at Cisco Beach right now?

The sea at Cisco Beach is currently 15.6°C — cold swimming conditions. Most swimmers will find the water comfortable when it's above 22°C; below 18°C feels fresh and a wetsuit is recommended.

What will the sea temperature be at Cisco Beach next week?

Based on long-term July averages and the latest marine model, expect the sea around Cisco Beach to sit close to 19.0°C over the next 7 days. Check the live 7-day chart above for the exact daily outlook.

When is the best month to swim at Cisco Beach?

July – August – September are typically the warmest months to swim at Cisco Beach, with sea temperatures at their seasonal peak.

Do I need a wetsuit at Cisco Beach?

With water currently at 15.6°C: above 22°C no wetsuit needed; 18–22°C a shorty is comfortable for long swims; 14–18°C a 3/2mm full suit; below 14°C a 4/3mm or thicker.

United States

Massachusetts · Atlantic Ocean

Cisco Beach

Surf south-Nantucket beach.

Cool water with a moderate swell and a moderate breeze — fresh conditions — a wetsuit is recommended.

View on map OpenStreetMap Directions

Sea temperature now

15.6°Cmild

Poor

Updated just now · Source: Open-Meteo Marine

Air temperature

22.4°C

Wave height

1.4 m

Wind

21.9 km/h

UV index

0.0 UV index

Location

Cisco Beach on the map, with nearby beaches and live sea temperatures.

7-day forecast

Water, air, waves, wind and UV outlook for the week ahead.

Wetsuit recommendation

4/3mm fullsuit

At 15.6°C you need a 4/3mm fullsuit, and many surfers add neoprene boots.

+ Optional 3mm boots

Surf & watersports

Cool water — the classic UK/Atlantic spring or Pacific Northwest summer range. A 4/3mm sealed-seam suit keeps you in the water for 90+ minutes. Boots prevent foot pain on rocky entries and extend session length.

Open-water swimming

Acclimatised swimmers manage 30 minutes; a thicker swim wetsuit (3/2) helps.

Recommendation tuned for Cisco Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.

Quick answer

Can I swim at Cisco Beach today?

The sea is currently 15.6°C — poor swimming conditions. Acclimatised swimmers will be most comfortable.

Key takeaways

• Located in Massachusetts, United States (Atlantic Ocean).
• Best suited to confident swimmers and watersports.
• Live data refreshed hourly from Open-Meteo Marine.

Monthly sea temperature averages

Tap any month to see what to expect — based on regional climatology.

Jan4°C Feb3°C Mar4°C Apr6°C May10°C Jun15°C Jul19°C Aug20°C Sep18°C Oct14°C Nov10°C Dec6°C

3°C → 20°C· Current month outlined· “Best” = within 2°C of the annual peak

Year-round sea temperature

Best swim months: Aug

Month	Sea	Comfort
Jan	4°C	Cold
Feb	3°C	Cold
Mar	4°C	Cold
Apr	6°C	Cold
May	10°C	Cold
Jun	15°C	Bracing
Jul	19°C	Pleasant
Aug ⭐	20°C	Pleasant
Sep	18°C	Pleasant
Oct	14°C	Bracing
Nov	10°C	Cold
Dec	6°C	Cold

Can you swim here? — Cisco Beach