Cape Cod Extended Forecast
Looking Ahead

Thursday: Any morning sun will quickly lose out to clouds and cool air. Highs reaching the lower 40s. Probability of precipitation: 10%
Friday: Cloudy with a chance for some showers as our next storm system takes aim at the region. Becoming brisk. A raw feel. Temperatures in the lower 40s. Probability of precipitation: 70%
Saturday: Cloudy with rain looking like a good bet - perhaps heavy at times. Windy. Temperatures in the 40s. Probability of precipitation: 70%
Sunday: Cloudy with rain and wind lingering as a slow moving storm passes by the area. Temperatures in the 40s. Probability of precipitation: 60%
Monday: Cloudy with showers still possible, perhaps mixed with some snow as colder air feeds in. Temperatures in the upper 30s to lower 40s. Probability of precipitation: 40%

Comments
I think by Thursday of next week we are likely headed for at least somewhat milder air. Your best bet is Saturday through Wednesday as things stand right now.