You can tweet them, bet dont be surprised if they wont answer. In last few months I send like 7 tweets to them, but I never got responded. I believe there is also a Konami support or something like that, maybe in theyr official site.
By the way, the whole weather thing reminds me of old FIFA where you couldnt change the weather in career mode and almost all of the games were at rainy nights. The solution was to add ability to choose the weather and time of the day you like. That simple. From that moment, FIFA always have this option. Given Konami and that full squad update comes out only on october 29th with small gameplay upgrades, I wouldnt be so sure it will be fixed this year. Next year? Not sure as well.
I just hope that they are aware of this and people let them know twitter/facebook, since otherwise, there were lots of glitch/bugs in PES 15 that could`ve been easily corrected by small patch, but that never happened.