Grafted Guava and got hit by storm

[behlgarden]

I was watching weather in So Cal for signs of stabe temp and then ended up grafting Mexican pink guava on to my Asian guava trees yesterday. Today we got hit with storm and temps may now drop to low 40's and even high 30's tomorrow.  I also had grafted the CHerimoya grafts that I got last week a week ago. Do you think grafts would survive OR just die in these temps below 50 degrees?