A cold front passage and associated drier air mass are the primary catalysts positioning 66-67°F as the leading implied probability (43%) for Atlanta’s minimum temperature on August 26. National Weather Service and AccuWeather guidance indicate overnight lows in the upper 60s to low 70s, with several model runs favoring radiational cooling under partly clear skies after daytime highs near 88–93°F. Typical late-August climatology shows average lows near 69–71°F, so the 66–67°F bin represents a modest but plausible below-normal outcome driven by reduced humidity and lighter winds following the front. Secondary clusters around 70–73°F (52% combined) capture the possibility of lingering moisture or increased cloud cover limiting cooling. Recent 24–48 hour model consensus has tightened around these ranges, with no major revisions from upstream ridging or tropical moisture that would push probabilities toward 63°F or below. Traders are weighting the most recent NWS forecast discussions and ensemble guidance ahead of the overnight period.