Harahan is a small city located in Jefferson Parish, Louisiana, with a humid subtropical climate. The summers are hot and humid, while winters are mild with occasional cold snaps. The city is situated along the Mississippi River and has access to Lake Pontchartrain, making it prone to floods. The hydrology constituents in Harahan include the Mississippi River, which provides the city with a source of drinking water.

Outdoor recreation opportunities in Harahan include the Harahan Playground, which features a walking trail, basketball court, and picnic area. The nearby Mississippi River Trail is a popular spot for cycling and jogging. Additionally, the city is close to several state parks, including Fontainebleau State Park and Bayou Segnette State Park, which provide opportunities for fishing, boating, and hiking.