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 12:02 PM. The temperature feels like 48.650000000000006 with a humidity level of 66 so dress accordingly. Cloud coverage is 56 percent with visibility at 14.7 percent. Today’s UV index is 0, don’t forget the sunscreen if you need it! Today’s winds are traveling south at a speed of 5 MPH. At the end of the day don’t miss the sunset at 9:43 PM.