From Stats taking over the Last 50 Years it is fairly easy to see that Typhoon Season in the Western Pacific really begins to pick up in late summer early autumn. This is the time of year wind shear becomes the most relaxed in the western pacific as the Jet Stream lifts North. Also sea surface temperatures are at there warmest after a full summer has baked the pacific Ocean.
Unlike other basins though you can see in the chart below even in the winter months the risk of Typhoons still persist. Most likely around the Philippines and in to the South China Sea.