National Weather Service forecasts and model consensus position trader sentiment toward San Francisco's April 12 high temperature clustering in the late 50s to low 60s, with 58-59°F leading at 37.5% implied probability due to persistent marine layer stratus clouds capping diurnal heating amid cool onshore flow from the Pacific. Recent showers and thunderstorms through April 10-11 have deepened the stratus deck, suppressing recent highs to the mid-50s at SFO— the likely resolution site—while historical April climatology averages 62°F but often dips lower under similar synoptic patterns. Key uncertainties include the extent of afternoon clearing and wind speeds; watch NWS updates overnight for refined guidance as ensemble models show slight divergence around 57-61°F outcomes.