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Boston Weather: 56.0°F | Mostly Cloudy

Weather: Ocean Effects

Nikki PrivÉ

staff meteorologist -- Gradually clearing skies today will allow temperatures to rise into the 60s as a weak high pressure system moves through the region. A sea breeze may develop in the afternoon that will cap temperatures along the coast. Saturday, a slow moving warm front is expected to approach Boston, with highs near 70°F. The warm front will bring unsettled conditions, with a chance of precipitation lingering through early next week. On Sunday and Monday, easterly winds will keep temperatures cooler, bringing in air from the chilly ocean waters.

Spring is a difficult season for weather forecasts in Boston, especially along the coastline. Ocean waters just offshore remain cold well into the summer, so whenever the wind blows inland from the ocean, the air temperatures will drop precipitously. On warm, sunny days, the land heats up quickly, causing a sharp temperature gradient between the ocean and the land. This temperature difference results in a pressure gradient, with low pressure over the land and higher pressure at sea, inducing a “sea breeze.” The sea breeze may keep summer afternoons pleasant, during the spring this means that Boston may remain chilly while nearby Worcester is warm. During the spring, the warmest days will occur when the large-scale wind pattern brings a strong westerly or northwesterly wind to the area, which combats the sea breeze. Thus, the forecast is highly dependent on subtle changes in the wind direction.

Extended Forecast

Today: Partly cloudy and pleasant. Highs around 65 F (18 C).

Tonight: Becoming cloudy. Temperatures in upper 40s F (9 C).

Saturday: Sunny. High near 70°F (21°C), lows near 50°F (10°C).

Sunday: Cloudy early, with showers developing during the day, high near 60°F (16°C).

Monday: Cloudy, chance of rain, highs near 60°F (16°C).