National Weather Service forecasts for San Francisco International Airport (KSFO) on April 12 indicate a high temperature clustering around 58-59°F, aligning with the market's leading implied probability of 42%, due to persistent marine stratus clouds and moderate onshore winds suppressing daytime heating under a partly cloudy sky. Recent observations show early April highs below climatological norms—such as 55°F on April 9—amid unsettled conditions with lingering low-level moisture from prior rain threats, as noted in NWS Bay Area discussions. Model consensus, including GFS and ECMWF runs, reflects limited boundary layer mixing, though slight warming potential exists if stratus clears earlier than expected. Traders price nearby bins like 56-57°F (25%) and 60-61°F (22.5%) amid this uncertainty, with hourly updates from NOAA expected to sharpen resolution by evening. Historical April 12 averages hover near 62°F, providing context for the cool bias.