Answer:
Slower.
Water acts as a stabilizing agent in coastal weather patterns. This is because water takes longer to gain and lose heat then air. So in the winter, the water is warmer then the surrounding air, and in the summer it is cooler then the surrounding air. This also stabilizes the daily temperature differences between day and night.
This is why areas such as Seattle, Miami, or any other coastal city all have fairly smooth and predictable weather patterns. A days high and low temperature will generally be 10°F to 20°F degrees of variance. Inland areas though, such as Kansas or Nebraska, have no such stabilizing effects. The daily high and lows can very 50°F or more.