Wind can be both a disadvantage and an advantage. When an emulsion is used, a gentle wind of constant velocity can accelerate the breaking of the emulsion and allow traffic on the roadway sooner. If the wind varies or is too strong, it can distort the fan pattern as the asphalt is applied. This may cause streaking and uneven distribution. Contractors may install a shield in front of the spray bar to minimize wind effects on the spray pattern.

Wind also tends to blow asphalt onto passing vehicles. It is particularly important to be careful of wind direction when applying modified asphalt cements. Small “cobwebs” of asphalt are blown around and are almost invisible until they land on a light-colored vehicle. To minimize the effects of blowing asphalt, the sequence of work should be considered.