too cold?

Temperatures have been an average 48 degrees at night. The last two days have been around 50 degrees and raining. Its has about 2-3 weeks left in flowering. Should I pull it for harvest or is it okay being outside in that type of weather?

No, do not pull them. They keep growing in the cold. But watch out for mold if you are getting rains. My NL and Skunberry are still out and need another week or two, temps have been highs in the 50's and lows in the lower 40's. I won't pull until my plants tell me they are ready or if we get a strong frost or two. Most marijuana plants can handle a few light frosts, just watch out for the long sustained cold heavy frost, those end it in a hurry. There is a good thread about cold weather and frost i will try and find for you. Wait it out, these last few weeks are very important for potency, density and weight.