Miami's May 17 weather will determine whether this narrow temperature window resolves YES. In late May, Miami typically sees high temperatures in the upper 80s to low 90s Fahrenheit, driven by strong Atlantic solar radiation and warming sea-surface temperatures as summer approaches. This market asks for an 80-81°F high—1–2 degrees cooler than seasonal norms—requiring extreme precision. The 1% YES odds reflect how improbable it is that the daily high lands in exactly this 1-degree band rather than above or below it. Liquidity of $5,661 and 24-hour volume of $2,409 indicate limited participation in this recurring daily market, typical for hyperspecific weather trades. Traders are pricing in deep skepticism that May 17 will produce such mild conditions; seasonal forecasts typically point to 88–90°F. For YES to resolve, Miami would need unseasonal cooling—perhaps a tropical system, cloud cover, or gulf breezes suppressing heat.
Deep dive — what moves this market
Miami's climate in mid-May sits at the transition between spring and early summer, with atmospheric conditions increasingly favorable for heat accumulation. Typical May 17 highs in Miami range from 87–90°F, with historical NOAA data spanning decades showing that 80-degree days occur in roughly 2–5% of May 17 observations, usually when rare cold-core systems or unusual upper-level troughs push south from the continental interior. The hypernarrow 80-81°F window requested here is even rarer than a simple 80-degree threshold, requiring the temperature to remain just below 82°F—a constraint that eliminates the majority of warm-season days. Factors supporting a YES outcome would primarily involve synoptic disruption: a slow-moving trough, a cold front with residual momentum, or an early tropical depression bringing convection and wind-driven cooling. Such systems occasionally form in the central Atlantic in May but rarely materialize with enough intensity and southward track to substantially depress Miami's maximum temperature by 5–10 degrees below seasonal normal. Historical analogs from past May 17 records show that when Miami recorded notably cool highs in that range, they coincided with major weather pattern shifts—offshore low-pressure systems, unusual Gulf Stream positioning, or upper-level divergence patterns that prevented daytime heating. Conversely, NO outcomes dominate because May 17 typically features full-strength Bermuda High influence by mid-month, abundant sunshine, light winds, and warming ocean temperatures near 78–80°F. The 1% YES price tells a clear story: traders assess the conditional probability of Miami hitting exactly this narrow band as extraordinarily low, reflecting both the precision required and the seasonal tendency toward warmth. The sparse liquidity and low daily volume indicate that most traders have allocated capital to more probable temperature breakpoints or other markets entirely.
What traders watch for
Watch upper-level trough positioning and jet stream movement through May 16; any Atlantic weather system development increases cooling potential.
Gulf and nearby Atlantic sea-surface temperatures drive heating; warmer water supports higher Miami highs, cooler water assists YES resolution.
Cloud cover and convection forecast—persistent clouds limit solar heating and support the 80-81°F outcome.
NOAA Miami International Airport official daily maximum is the resolution authority; verify recorded high by end of May 17 UTC.
How does this market resolve?
Market resolves YES if the official daily high temperature in Miami (NOAA Miami International Airport station) on May 17, 2026, is between 80.0–81.0°F inclusive. Resolution finalizes by 11:59 PM UTC May 17.
Prediction markets aggregate trader expectations into real-time probability estimates. On Polymarket Trade, every market question resolves YES or NO based on a specific event outcome; traders buy shares of the side they believe will resolve positively. Prices range 0¢ (certain no) to 100¢ (certain yes) and naturally reflect the crowd-implied probability of YES. This page summarizes the market state for readers arriving from search; for live trading (place orders, see order book depth, execute a trade) open the full interactive page linked above.
