NWS: Expect Warm End To May, Start To June In Duluth And Superior Spring is in the air and we are rolling into summer, finally leaving that brutal winter behind us. With that said, the National Weather Service Climate Prediction Center has their eye set on summer. They just released a weather outlook for the country, including the Duluth and Superior area. Their outlook extends into early to mid June. From the looks of it, we will be seeing smooth sailing in the temperature department through early next month. According to their insight, the Twin Ports has a pretty moderate chance of seeing temperature above average for the month. The chances? Between fifty-five and sixty percent.