London's minimum temperature on June 15, 2026, is expected to reach 13°C according to multiple forecast models, reflecting stable atmospheric conditions under moderate high pressure that limit overnight radiative cooling. Official guidance from sources like the Met Office and European models shows overnight lows holding near 13°C amid partly cloudy skies and light winds, consistent with climatological baselines for mid-June where typical minima range from 11–12°C but current steering patterns suppress further drops. This strong consensus arises because no significant cold advection or clear-sky radiative events are projected before the daily minimum is recorded. A sudden shift in cloud cover or an unmodeled frontal passage could still allow a brief dip below this threshold, though model agreement makes such outcomes improbable by resolution time.