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Core Rulebook / Chapter 10: Game Mastering / Environment / Climate

Wind

Source Core Rulebook pg. 517 4.0
Wind imposes a circumstance penalty on auditory Perception checks depending on its strength. It also interferes with physical ranged attacks such as arrows, imposing a circumstance penalty to attack rolls involving such weapons, and potentially making attacks with them impossible in powerful windstorms. Wind snuffs out handheld flames; lanterns protect their flame from the wind, but particularly powerful winds can extinguish these as well.

Moving in Wind

Source Core Rulebook pg. 517 4.0
Wind is difficult or greater difficult terrain when Flying. Moving in wind of sufficient strength requires a Maneuver in Flight action, and fliers are blown away on a critical failure or if they don’t succeed at a minimum of one such check each round.

Even on the ground, particularly strong winds might require a creature to succeed at an Athletics check to move, knocking the creature back and prone on a critical failure. On such checks, Small creatures typically take a –1 circumstance penalty, and Tiny creatures typically take a –2 penalty.