National Weather Service guidance currently centers the highest temperature in Atlanta on May 17 near 86–88 °F under a strengthening upper-level ridge that favors subsidence, clear skies, and efficient daytime heating. Ensemble model runs show only modest spread, with light southerly flow and dew points in the low 60s limiting additional moisture-driven warming or cooling. Historical May climatology places the average daily high at 84 °F, so the market’s tight clustering between the 86–87 °F and 88–89 °F bins reflects the narrow window between baseline radiative heating and any slight ridge strengthening or cloud-cover increase that could trim a degree or two by afternoon. Final observations from Hartsfield-Jackson International Airport will settle the outcome.