Latest National Weather Service guidance and ensemble models point to a mild peak temperature on September 16 driven by persistent onshore southwest flow and a strengthening marine layer that limits daytime heating along the coast. Highs are currently expected in the mid-to-upper 60s, consistent with the tight market clustering around 66–69 °F, as modest cloud cover and 10–20 mph winds suppress warming relative to the September climatological average of about 71 °F. Small differences between the 66–67 °F and 68–69 °F bins hinge on the precise timing of any afternoon clearing and exact wind speeds at the official recording station; stronger marine influence or lingering stratus would favor the lower range, while slightly earlier clearing could push readings toward the higher bin. Updated model runs and NWS forecast discussions through the next 48 hours will refine these thresholds ahead of resolution.