I can be a bit obsessive about the weather. Milwaukee is currently experiencing a heat wave.
Which means that you have to anticipate that your pace will be slower. The ideal half marathon conditions are 55 degrees. For every 5 degrees above that, your performance degrades by 2 percent. This means that if you're running in 80-90 degree heat (which is forecasted for race weekend), your pace will slow down around 10 percent. Humidity only makes the situation worse. My strategy is to wear the least amount of clothing as possible and to stay in the shade as much as I can. I will hydrate often and early. Regardless of the temps, I know this will be a race to enjoy. The course is along beautiful Lake Michigan. Incidentally, I'm scheduled to speak at a college in Menomonee Falls on Monday before flying back to RDU. A former doctoral student of mine teaches there. His name is Paul Himes and he blogs here. Check out his website if you're at all interested in biblical studies.
Have a wonderful weekend!