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Weihai occupies a distinctive coastal position on the northeastern tip of Shandong Peninsula, where the Yellow Sea meets the Bohai Sea, creating a unique maritime geography that profoundly influences its air quality. The city stretches across a series of low hills and coastal plains, with elevations generally below 300 meters, though nearby Mount Kunyu rises to 923 meters, providing some topographical relief. This peninsular location places Weihai at the eastern edge of the North China Plain, separating it from the heavy industrial belts of inland Shandong and offering natural ventilation from sea breezes. The urban core clusters along the coastline, with development extending inland in a gradient that transitions from dense port areas to suburban zones and then to agricultural hinterlands growing grains, fruits, and vegetables. Proximity to the sea moderates pollution accumulation, as marine winds frequently disperse airborne particulates, yet the city remains connected to regional pollution transport from the broader Shandong industrial corridor, particularly when winds shift westerly. The surrounding landscape—characterized by bays, islands like Liugong Island, and protective headlands—creates microclimates that can trap pollutants under certain stable atmospheric conditions, though less severely than in landlocked cities. Weihai's position as a major port and tourism hub introduces localized emissions from shipping and seasonal traffic, balanced by its reputation as one of China's cleanest coastal cities due to this advantageous geography.

Weihai's air quality follows a distinct seasonal rhythm shaped by its maritime climate and regional weather patterns, offering clear guidance for residents and visitors. In winter, from December to February, pollution levels typically peak due to increased coal heating emissions, combined with frequent temperature inversions that trap pollutants near the surface, especially during calm, cold days; sensitive groups like children and the elderly should limit prolonged outdoor exposure during these months. Spring, from March to May, sees gradual improvement as warming temperatures and stronger sea breezes from the Yellow Sea enhance dispersion, though occasional dust storms from inland Mongolia can temporarily elevate particulate levels, making late spring ideal for outdoor activities. Summer, from June to August, offers the cleanest air, with monsoon-influenced southeasterly winds and higher humidity aiding pollutant scavenging, while frequent fog and sea mist can sometimes reduce visibility without significantly impacting health metrics—this season is optimal for hiking and coastal recreation. Autumn, from September to November, maintains relatively good air quality initially, but as heating season approaches and winds shift to northerly directions, pollution may slowly increase, particularly in November; planning outdoor events earlier in autumn is advisable. Throughout the year, Weihai benefits from its coastal location, which mitigates extreme pollution episodes common in inland industrial zones, though monitoring local advisories during transitional seasons ensures proactive health management.