<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.majira ya joto huleta baadhi ya hali ya hewa na ukungu nzito zaidi kwa kisiwa, ambayo inaishangaza wageni wengi nje ya mji kwa san francisco.  <response>: summer brings some of the coolest weather and heaviest fog to the island, which surprises many out-of-town visitors to san francisco. 