Wind can play a big part in the handling of your boat. This especially affects any Cat or Hydro type hull that uses the air to lift the boat out of the water.

Try to spot wind coming your way, before it wipes your boat out. 

Read the Water: If you look across the water, you can usually see "ruffled" (non glossy) water. This is wind. Water is usually very "glossy" even with swells, but when wind hits the waters surface it becomes dull and ruffled. 

Look closely in the middle of the picture to see the wind on the water.

What to do: Slow down slightly (getting your boat to settle back into the water) just prior to entering the windy zone and take notice of any affect on the boat as a result of the wind. NOTE: The wind's affects on your boat will be increased if you are jumping or turning at high speed. If nothing noticeable, gas it back up and keep having fun! If it flips your boat you might want to try driving later...

Unstable boat as a result of wind: Try things like changing the location of heavy items in your boat (like the battery) and keeping your speed down a little, where the boat still stays in the water.

Wind conditions/types:
NONE: Perfect for all types of R/C boats. This is the most fun and your boat will perform the best.
LIGHT (1-5 MPH): Great for Deep Vees and Cats, OK Hydros and Out Riggers
MODERATE (6-10): Good for Deep Vees and Cats, NOT Hydros and Out Riggers
HIGH (11-20): OK for Deep Vees and Cats. If you are jumping the swells, plan on doing some swimming to get your flipped boat!

For additional information, see: Water Types