No not always safe. I will put my points here.
Suppose Nifty is at 4700 and CE4700 is at 130 & PE4700 is at 130.
If the nifty is too bullish for the month and likely to close higher than 4830 you will be at profit. Similarly you will be at profit if the nifty closes below 4570.
i.e 4830 on the upper side and 4570 on the lower side are break even points.
If nifty closes between 4570 to 4830 and you are holding the straddle till end, you will be at loss. Extent of loss will be lesser if nifty closes near to above mentioned points (i.e away from 4700).
Murtaza bhai, kindly endorse it
.
Regards
Chachi
Holding my straddle (4700) at 221