Kluge,
30 minutes won't cut it. GAS or non-GAS, you can't do anything decent on a Weber in 30 minutes. John Eacott's electric griddle would be more practical to do a few snags.
However, apart from the cloud, the showers and the TS what are you complaining about? I could arc up the beast in an environment that's got those temps, with a little bit of cover, and without any problems.
Did it many a time in SEA. Hell, if you can't improvise son, in Honkers summer weather, then I don't doubt that you're a GASSMAN.