what is the weather like here?
Oceanic temperate rainforest climate
Redwood National and State Parks
The Redwood National and State Parks have an oceanic temperate rainforest climate, with cool-summer Mediterranean characteristics. 
where does the redwood forest start and end It begins and ends along the coast of northern California. It comprises Redwood National Park and California's Del Norte Coast, Jedediah Smith, and Prairie Creek Redwoods State Parks
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Redwood National and State Parks [SEP] Climate
The Redwood National and State Parks have an oceanic temperate rainforest climate, with cool-summer Mediterranean characteristics. Weather in RNSP is greatly influenced by the Pacific Ocean. Coastal temperatures generally range between 40 and 60 degrees Fahrenheit (4–15 °C) all year round, while further from the coast summers are hotter and drier, and winters are colder. Redwoods mostly grow a mile or two (1.5–3 km) from the coast, and never more than from it. In this temperate but humid coastal zone, the trees receive moisture from both heavy winter rains and persistent summer fog. The presence and consistency of the summer fog is actually more important to overall health of the trees than heavy precipitation.