Comment by silversmith

IP_7 means it's ok with water immersion for up to 30 minutes, down to 1m. You can go swimming with an IP_7 rated device.

IP_8 is "more than 1m, more than 30min water immersion" rating.

"outdoors in the rain" needs IP_5 rating if you want to be safe. You do not need a dive watch to go out in rain.

Even non-waterproof devices are not exactly made of sugar. My first iphone was a 3gs. I want running with the device in an armband. My rain precautions were plugging in 3.5mm earphones, and pointing the charge port downwards. Regularly got caught in rain with it, and the device was completely fine two years later when I sold it.