Cape Cod Bay Marine Forecast
| This Afternoon...N Winds Around 10 Kt With Gusts Up To 20 Kt, Becoming Ne. Seas Around 2 Ft. Wave Detail: Nw 1 Foot At 3 Seconds And E 1 Foot At 10 Seconds. Isolated Showers And Tstms. |
| Tonight...Sw Winds 5 To 10 Kt, Becoming N With Gusts Up To 20 Kt After Midnight. Seas Around 2 Ft. Wave Detail: Nw 1 Foot At 3 Seconds And Ne 1 Foot At 10 Seconds. Scattered Showers In The Evening. |
| Sat...N Winds 5 To 10 Kt. Seas Around 2 Ft In The Morning, Then 1 Foot Or Less. Wave Detail: N 1 Foot At 3 Seconds, Becoming N 1 Foot At 4 Seconds. |
| Sat Night...Se Winds Around 5 Kt, Becoming Sw After Midnight. Seas 1 Foot Or Less. Wave Detail: N 1 Foot At 4 Seconds. |
| Sun...S Winds 5 To 10 Kt With Gusts Up To 20 Kt. Seas 1 Foot Or Less, Then Around 2 Ft In The Afternoon. Wave Detail: Nw 1 Foot At 4 Seconds, Becoming S 1 Foot At 3 Seconds And Ne 1 Foot At 4 Seconds. |
| Sun Night...S Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 2 To 3 Ft. Wave Detail: Se 2 Ft At 4 Seconds. Showers Likely After Midnight. |
| Mon...S Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 2 To 3 Ft. Showers Likely. |
| Mon Night...Nw Winds 5 To 10 Kt. Seas Around 2 Ft. A Chance Of Showers. |
| Tue And Tue Night...N Winds 5 To 10 Kt, Becoming S. Seas Around 2 Ft, Then 1 Foot Or Less. Winds And Seas Higher In And Near Tstms. Seas Are Reported As Significant Wave Height, Which Is The Average Of The Highest Third Of The Waves. Individual Wave Heights May Be More Than Twice The Significant Wave Height. |
| Area Forecast Discussion National Weather Service Boston/Norton MA 1118am EDT Fri August 14 2026 .WHAT HAS CHANGED... Overall, little change to the forecast, with increasing confidence that most of Sunday remains dry before rain chances increase Sunday night into Monday. .KEY MESSAGES... - Seasonable, less humid, and mainly dry conditions today, though an isolated afternoon shower or thunderstorm is possible. - Dry, seasonable, and comfortable weather continues through the weekend. - Rain chances return late Sunday into Monday, followed by quieter weather through most of next week. KEY MESSAGE 1...Seasonable, less humid, and mainly dry conditions today, though an isolated afternoon shower or thunderstorm is possible. Overall, not much has changed with today's forecast. If kicking off the weekend early this Friday, pleasant weather is expected in the wake of yesterday's cold front. Mainly sunny skies and a well-mixed boundary layer will allow temperatures to climb into the lower to middle 80s, with periodic breezy northwest winds. A sea breeze may develop along Boston's South Shore. Drier air continues to advect into southern New England, with humidity lowering through the day. A surface trough dropping south from northern New England this afternoon may provide enough convergence for an isolated shower or thunderstorm, though coverage is expected to remain very limited. Any shower or storm that develops should move through quickly and remain non-severe. Despite the pleasant weather, a moderate risk for rip currents is expected today and Saturday. Those heading to the beach should remain aware of local conditions and check with lifeguards or beach staff regarding rip current risks at their specific location. Clear skies and light winds tonight will support effective radiational cooling. Lows fall into the 50s across the cooler outlying locations, while urban centers remain near 60 degrees. KEY MESSAGE 2...Dry, seasonable, and comfortable weather continues through the weekend. Quiet weather is expected this weekend as high pressure originating from northern Canada settles across the Northeast through the first half of Sunday. PWATs (Precipitable Waters) lower to between 0.5 and 0.7 inches, resulting in a notably dry airmass with little humidity. Temperatures remain seasonable, with highs generally ranging from the upper 70s to lower 80s. Another cool night is expected Saturday night with clear skies and light winds supporting effective radiational cooling. Lows fall into the lower to middle 50s across the cooler outlying locations, while urban centers remain near 60 degrees. High pressure begins to shift offshore Sunday as a low pressure system approaches from the Great Lakes. Increasing warm air advection will bring increasing clouds through the afternoon, while temperatures remain seasonable. Humidity will gradually increase as dew points rise into the lower 60s. KEY MESSAGE 3...Rain chances return late Sunday into Monday, followed by quieter weather through most of next week. The next opportunity for rainfall arrives during the second half of Sunday, with the steadiest rain expected Sunday night into early Monday. There is growing confidence that most, if not all, of the daylight hours Sunday remain dry. Ensemble guidance generally keeps the probability of measurable rainfall below 50 percent until around 00-06Z Monday, supporting a later onset to the rainfall. There remains uncertainty regarding rainfall amounts, however, as the best forcing is associated with the surface low and differences in its track make it difficult to determine where the greatest rainfall will occur. Ensemble guidance continues to depict differing solutions, with some members keeping the primary low farther north while others track it closer to or across southern New England. Regardless of the eventual track, rainfall appears increasingly likely Sunday night, though uncertainty remains regarding how much rain will fall. Global guidance is in agreement that PWATs (Precipitable Waters) may exceed 2 inches, supporting the potential for locally heavy rainfall. The ECMWF (European Centre for Medium-Range Weather Forecasts) EFI and Shift of Tails for Quantitative Precipitation Forecast also highlight a signal across northern New England, while a Marginal Risk (level 1 of 4) for excessive rainfall remains in place for all of New England, with the exception of northern Maine. Ensemble guidance continues to show considerable spread in potential rainfall totals, with the ECMWF ensemble being the more robust solution and the GFS (Global Forecast System) and CMC ensembles generally depicting lower totals. The system appears progressive, with a cold front clearing east of New England by Monday afternoon or evening. Drier air then advects in from the northwest, leading to another dry stretch Tuesday through Wednesday, and possibly into Thursday, as surface high pressure builds back into the region. Temperatures remain seasonable, with highs in the lower to middle 80s and tolerable humidity as dew points remain in the lower 60s. Unsettled conditions may return late next week. Marine Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Through Saturday...High confidence. Tranquil boating conditions are expected as high pressure settles in from the north and remains in place through most of the weekend. Most, if not all, of this period will remain dry, with only a low probability of a spot shower this afternoon. Northwest winds early this morning become southwesterly this afternoon, with wind speeds generally less than 12 kt and seas between 2 and 3 ft. On Saturday, wind direction becomes more variable as surface high pressure builds overhead. Nearshore sea breezes may develop, with winds generally 10 to 15 kt. Outlook /Saturday Night through Tuesday/... Saturday Night through Sunday: Winds less than 25 kt. Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Local rough seas. Chance of rain showers. Monday: Moderate risk for Small Craft Advisory winds with local gusts up to 30 kt. Areas of rough seas. Rain showers likely, slight chance of thunderstorms. Monday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers. Tuesday: Winds less than 25 kt. NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...None. RI...None. Marine None. |
Boston MA Radar
Northeast Radar
East Coast Satellite