The temperature in San Francisco is usually ideal for walking with relatively warm temperatures. Cool breezes off the ocean mean that extreme heat waves are mitigated and a light jacket for cooler periods is usually sufficient. Fog is a common occurrence in San Francisco and can reduce visibility significantly. When dense fog is present, be careful crossing streets as motor vehicles cannot see pedestrians well.
The Zion District has plenty of sidewalks to keep you separate from roadways and there are lots of playgrounds, small parks, and church and school properties with green landscaping throughout the region.