Current National Weather Service and private-model guidance for San Francisco on August 13 centers on a daily high in the mid-to-upper 60s, reflecting the dominant marine layer and steady southwesterly onshore flow that limits afternoon warming. Persistent low stratus and fog, reinforced by a moderate sea-breeze circulation, keep surface temperatures near the seasonal normal of roughly 67–68 °F at downtown and airport stations. Minor differences among forecast runs hinge on the exact timing of any afternoon clearing and wind speed; stronger gradients favor the 66–67 °F bin while slightly reduced marine influence could push readings into the 68–69 °F range. Traders have priced these outcomes most heavily because the latest model consensus shows no significant synoptic warming or offshore flow expected before the daily maximum is recorded.