Outdoor temperature question.

Hello. I have been growing 4 plants near my pond. Unfortunately, I found that my biggest plant is a male. That bastard! However, I checked the other plants out today and found that I do have two female plants...one that is budding a little. What's the lowest temperature and weather conditions that my plants can survive in. This week the temperatures are predicted to be pretty low at night, but after this weekend the temp is supposed to rise up again. I have attached a screenshot of the projected forecast. I need your expert advice.

when i had my outdoor crop a couple years ago and temps dropped like that for about 2 weeks I placed those clear trash bags around each plant to keep most of the warm air in. the transparency let most of the light in but i wouldnt reccomend it for long periods of time. Maybe a week or two tops. Also, dont tie the bottom of the bag, it depletes Co2 to leaves. If all else fails, cross your fingers and spin in a circle 3 times. lol

The average temperature for the month of October where I live does not look great for my plants. It may be time to bring them in a start constructing a box of some sort with fans and lights and all that.