What is the author implying in the phrase the wind must have been right

Wind is often used for directional and navigational purposes, so this could mean that the author followed something by the wind whether it be how high or low the air- pressure is or which way the wind is blowing. Aswell as the fact that Wind is a major factor in weather determination. For example, if the wind blows ina counter- clockwise direction, then the air pressure is low which means that the weather is or will be bad like rain or storms. 
Hope this helps!