Surf Forecasts:
Block Island surf forecast from 17 Sep 2026:
- Most powerful swell: Thursday 24 Sep, 8PM (local time) - 8ft (2.5m), 10s period, E swell with 1,357 kJ wave energy.
Best Forecast Surf Conditions for Block Island this week:
The most powerful waves expected at Block Island in the next 16 days are 2.5m 10s and forecast to arrive on Thursday (Sep 24) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Saturday (Sep 19) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Thu 24th Sep) | 8ft (2.5m) 10s |
Table - best surf conditions forecast for Block Island over the next 16 days.
Short Range ForecastMostly dry. Warm (max 26°C on Fri afternoon, min 14°C on Sat morning). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 48mm), heaviest during Sun night. Warm (max 20°C on Sun night, min 13°C on Tue afternoon). Winds increasing (light winds from the SE on Sun afternoon, strong winds from the ENE by Wed morning). | |||||||||||||||||||
Thu 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | ||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | E 7 | SW 4 | SW 5 | SE 12 | SE 12 | ENE 6 | ENE 5 | SE 11 | SE 11 | SE 10 | SE 10 | SE 9 | ESE 5 | E 6 | E 7 | ENE 7 | E 7 | E 8 | E 8 | E 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 16 | 40 | 49 | 22 | 21 | 132 | 33 | 19 | 18 | 26 | 25 | 29 | 123 | 354 | 619 | 579 | 515 | 871 | 1009 | 1088 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | off | glassy | cross-off | cross-off | cross-on | cross-on | on | on | cross | cross-off | cross-off | cross | cross-off | cross-off | cross | cross | cross | cross |
High Tide | 1:13AM0.61m | 2:11PM0.77m | 2:30AM0.59m | 3:24PM0.75m | 3:49AM0.61m | 4:27PM0.76m | 4:52AM0.66m | 5:17PM0.78m | 5:42AM0.73m | 5:58PM0.82m | 6:23AM0.81m | 6:34PM0.85m | ||||||||
Low Tide | 7:58PM0.27m | 6:24AM0.25m | 9:08PM0.29m | 7:41AM0.28m | 10:08PM0.27m | 9:50AM0.27m | 10:58PM0.24m | 10:54AM0.24m | 11:39PM0.19m | 11:45AM0.19m | 00:14AM0.13m | 12:27PM0.14m | 00:45AM0.08m | |||||||
 |  |  | | | | | |  |  |  | | | | | |  | | | | |
 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:31 | — | — | 6:33 | — | — | 6:33 | — | — |
 | 6:52 | — | — | 6:51 | — | — | 6:49 | — | — | 6:46 | — | — | 6:45 | — | — | 6:44 | — | — | 6:42 | — |
mm | — | — | — | — | — | — | — | — | — | 4 | 44 | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 21 | 23 | 26 | 24 | 14 | 16 | 15 | 17 | 17 | 20 | 15 | 17 | 16 | 15 | 13 | 13 | 15 | 14 | 14 |
Feels °C | 20 | 19 | 24 | 27 | 24 | 7 | 12 | 10 | 14 | 15 | 20 | 9 | 11 | 10 | 8 | 4 | 4 | 6 | 5 | 6 |
Swell 1 Height (m) Direction Period (s) | E 7 | E 7 | SW 5 | SSW 5 | SW 5 | ESE 12 | ESE 8 | ESE 7 | SE 11 | SE 10 | SE 10 | SE 9 | SW 6 | SW 5 | — | — | — | — | — | — |
| kJ | 16 | 8 | 49 | 17 | 6 | 13 | 23 | 18 | 18 | 26 | 25 | 29 | 5 | 1 | — | — | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | SE 12 | SE 12 | ESE 7 | ESE 7 | ESE 7 | SW 5 | SE 11 | SE 11 | ESE 7 | ESE 7 | ESE 7 | SW 5 | — | — | — | — | — | — | — | — |
| kJ | 6 | 6 | 10 | 9 | 9 | 1 | 5 | 19 | 10 | 5 | 4 | 1 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | SE 9 | SE 9 | ESE 12 | SE 12 | SE 12 | — | SW 5 | SE 9 | NE 6 | ESE 7 | ESE 8 | — | — | — | — | — | — | — | — | — |
| kJ | 3 | 3 | 14 | 22 | 21 | — | 1 | 3 | 1 | 9 | 7 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 3 | SW 4 | — | — | NNE 3 | ENE 6 | ENE 5 | E 4 | ESE 5 | ESE 5 | ESE 4 | ESE 4 | ESE 5 | E 6 | E 7 | ENE 7 | E 7 | E 8 | E 8 | E 9 |
| kJ | 4 | 40 | — | — | 10 | 132 | 33 | 9 | 8 | 8 | 8 | 19 | 123 | 354 | 619 | 579 | 515 | 871 | 1009 | 1088 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1008 | 195 | 29 | 49 | 634 | 130 | 1812 | 1148 | 844 | 198 | 29 | 605 | 966 | 846 | 645 | 844 | 1511 | 1812 | 769 | 642 |
Best forecast wave conditions in Rhode Island | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Block Island surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Block Island Surf forecast
The above surf forecast table for Block Island provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Block Island can be found by selecting the local surf guide option on the grey menu. Our Block Island surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Block Island) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Block Island may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Block Island is 33 km (20 miles) from Westerly. If you plan a vacation in Rhode Island, look for hotels and other accommodation in Westerly. Westerly has rooms for a wide range of budgets as well as car hire and transport links.
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