If you planning to travel to Black Rock, Rarotonga, Cook Islands, here is your 6-day travel weather forecast to make sure you have all the essentials needed during your stay. Start your day when the sunrises at 4:42 PM. The temperature feels like 75.9 with a humidity level of 81 so dress accordingly. Cloud coverage is 22 percent with visibility at 14.9 percent. Today’s UV index is 12, don’t forget the sunscreen if you need it! Today’s winds are traveling southeast at a speed of 12 MPH. At the end of the day don’t miss the sunset at 4:11 AM.