Wind: usually helpful (up to a point)

A light to moderate breeze speeds drying by continually replacing the damp air sitting near the panel. Very strong gusts can make washing harder (spray everywhere, towels flapping, grit blowing onto wet paint).

Humidity: the hidden slow-down

High humidity means the air is already full of water vapour. Evaporation slows, so rinse water hangs around longer — which can be good (less flash-drying) but also means more time for drips and streaks.

So what's 'good'?

  • Mild temperature, some breeze, and not too muggy.
  • Avoid blazing sun on hot panels unless you can work panel-by-panel.