Summer begins on Friday at 11:54 a.m. EST, but the weather will not feel like the dog days for the Shipyard Old Port Half Marathon & 5K in Portland, Maine on Saturday morning. A bothersome weather system bringing occasional showers late in the workweek will be swept out to sea by early Saturday. Dry air and a gusty northwest wind follow in its wake, and the weather looks pretty good for the thousands of runners participating in the annual Old Port races.
Dew points in the 60s are not uncommon in late-June in the Portland area. Thankfully, the dew point will be much closer to 50° on Saturday morning, and that makes the humidity a non-factor for the runners. The temperature will not be far from normal for late-June in Old Port, but the low humidity will make it feel pretty comfortable. 60s with low humidity is a good part of the recipe for a fast time.
The northwest wind will cut both ways on the winding half marathon course. There will be a couple of miles of headwind, but also some tailwind, and most of the time it will be a cross wind. Part of the course is exposed to the wind, and there are other stretches where the wind will be blocked by buildings.
All things considered, the weather looks very good for this year’s races. Since it’s so early season, a very humid day would not be great for many runners who have not yet acclimated to summer training. The wind may be annoying at times, but it’s better than temps climbing into the low 80s with high humidity.
As far as cloud cover goes, there may be some clouds early in the day, and fair weather clouds are possible by late in the morning, but the strong June sun should break through from time to time, and if you’re susceptible to a quick sunburn you may want to slap on some sunscreen even if it’s cloudy at 6 a.m.