If you planning to travel to Mt. Gretna Lake & Beach, Lebanon, Pennsylvania, 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 11:59 AM. The temperature feels like 28.049999999999997 with a humidity level of 88 so dress accordingly. Cloud coverage is 86 percent with visibility at 7 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling west-northwest at a speed of 17 MPH. At the end of the day don’t miss the sunset at 9:44 PM.