Why is dublin warmer than san francisco

San Francisco, California has a Mediterranean warm climate whereas Dublin has a marine west coast climate.

San Francisco is also in or near the warm temperate dry forest biome whereas Dublin is in or near the cool temperate moist forest biome.

The climates are different. Like in Dublin right now it's partly cloudy however in San Francisco it's mostly cloudy. San Francisco is in California and Dublin is in Ireland. So two different places will have different timing and climate zones.