Hi Christian,
If you look at the applyRulesForCampaign method, you can see a block that looks like this:
if (evaluateWeatherRules(weatherConditionRules, weather)) {
// your logic goes here
}
You can replace the call to adjustBids method to do whatever logic you want your script to perform.
Cheers,
Anash P. Oommen,
AdWords Scripts Team.