what is the weather in guam
Find the Best Homes On Guam. Weather. One of the big draws to living in the islands is the beautiful scenery and the undeniable fact that you will never be cold again, unless you want to be. The climate here is considered tropical marine with temperatures averaging 86F (30C) for highs and 76F (24C) for lows. In the coolest months of January and February, when the weather is generally less humid and we experience westerly trade winds. The warmest conditions are usually felt during March through August.