Recent forecasts from the National Weather Service and models indicate overnight lows for Los Angeles on August 21 centering on the upper 60s to low 70s, driven by a persistent marine layer bringing low clouds and fog that limit radiative cooling after daytime highs near 90°F. This setup creates tight clustering in market-implied odds across 62–75°F bins as traders weigh variable fog timing, wind patterns, and microclimate differences between coastal stations like LAX and inland areas. Historical August minima average near 67°F, but slight shifts in cloud cover or sea breeze strength could tip the official low into adjacent ranges, underscoring the narrow uncertainty reflected in the balanced probabilities.