Miami May 9 Low Temp: Can 76-77°F Hold at 51.5%?

The 76-77°F bracket for Miami’s overnight low on May 9 sits at 51.5% implied probability. That is barely a coin flip. With resolution set for 2026-05-09 12:00:00, traders have less than 24 hours to find out whether the market’s leading pick lands, or whether an adjacent bracket like 78-79°F or 74-75°F steals the outcome.

Miami’s overnight lows in early May typically cluster in the mid-to-upper 70s. The National Weather Service models for South Florida show a warm, humid airmass parked over the region through May 9. That setup supports the 76-77°F range, but warm Gulf moisture and light wind conditions could easily push the reading one bracket higher. The market knows this. That is why the YES price sits at 0.52 and the NO price at 0.49.

How the 76-77°F Contract Works

This contract asks one question: will Miami’s lowest recorded temperature on May 9, 2026, fall between 76°F and 77°F inclusive? Resolution happens at 2026-05-09 12:00:00, based on official measurement data. The National Weather Service Miami office records the official low for Miami International Airport, which serves as the standard observation point for contracts like this.

• YES (76-77°F): Price 0.52, implied probability 51.5%. Pays out if the official low lands in this two-degree window.
• NO (any other bracket): Price 0.49, implied probability 48.5%. Pays out if the low falls in any other range, from 71°F or below up to 90°F or higher.

The NO side wins if the overnight low misses the 76-77°F window entirely. National Weather Service data shows Miami’s May overnight lows have historically ranged from the low 70s to the low 80s depending on synoptic wind patterns. A stronger onshore flow from the Atlantic raises the floor. A brief passage of drier air from the northwest lowers it. Either event pushes the reading out of the winning bracket and into 74-75°F or 78-79°F territory, both of which are live alternatives priced in this market.

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Momentum and What the Market Signals

The 1-hour change of +21.0%, the 24-hour change of +9.5%, and the trend score of 78.03 combine into one clear message: money moved hard into the 76-77°F bracket in the last trading session. The most likely driver is an updated National Weather Service forecast run that tightened the expected low toward the mid-70s range.

Total market volume is $3,128. The 24-hour volume is $1,900. Liquidity sits at $13,443. These are thin numbers. Volume under $1M means this price can reprice sharply on a single updated forecast model or an unexpected overnight temperature reading. One large trade or one new NWS forecast cycle could push the YES price above 0.60 or drop it back toward 0.40 before resolution.

• The 1-hour price jump of +21.0% signals a concentrated bet, not broad trader consensus. Thin liquidity amplifies single-trade moves.
• The 24-hour trend of +9.5% shows the bracket has been gaining ground steadily through the trading day on May 8.
• The trend score of 78.03 places this market in moderate-to-strong momentum territory, but with volume this low, momentum can reverse on the next forecast update.
• The 78-79°F bracket remains the most dangerous competitor. South Florida’s marine influence tends to keep overnight lows elevated, and that bracket would benefit from a warmer-than-expected evening.
• The 74-75°F bracket is the main downside risk. Any inland drainage or brief wind shift could drop the reading below 76°F.

Lines Analysis: Miami’s Low and the Two-Degree Problem

The National Weather Service model guidance as of May 8 supports a low in the mid-to-upper 70s for Miami on May 9. That range straddles the 76-77°F and 78-79°F brackets almost equally. The momentum into 76-77°F suggests traders are reading the most recent forecast runs as pointing toward the lower end of that mid-70s cluster.

The 78-79°F bracket is the primary challenge to the leading outcome. Miami’s marine layer and persistent Atlantic moisture often keep overnight lows elevated in early May. If the surface wind stays out of the southeast and sky conditions remain cloudy overnight, radiational cooling gets suppressed. That suppression pushes the low into 78°F or above, handing the outcome to the adjacent bracket and leaving 76-77°F holders empty.

• National Weather Service Miami’s next forecast discussion before overnight May 8-9 is the single most important signal to monitor.
• Surface wind direction at Miami International Airport after 10 PM local time directly controls how low the temperature drops.
• Cloud cover overnight is a secondary factor: clear skies allow cooling toward 74-75°F, overcast skies suppress it toward 78-79°F.
• Any updated GFS or NAM model run showing a dew point above 76°F in Miami after midnight favors the 78-79°F bracket.

The $3,128 in total volume reflects a small, high-conviction market rather than broad consensus. The data from NWS model guidance leans toward the 76-77°F bracket, but the margin is narrow enough that a single forecast revision before midnight could reprice the contract entirely.

LINES VERDICT

Narrow Lead, Thin Market

The 76-77°F bracket holds a slim 51.5% edge supported by recent NWS model guidance pointing toward the mid-70s overnight low. That edge is real but fragile in a market this thin.

What the market says: 51.5% is the market’s best guess, not a confident call. With resolution at 2026-05-09 12:00:00, any forecast update in the next 18 hours could shift the price sharply given how little liquidity exists in this contract.

Key unknown: The National Weather Service Miami forecast discussion issued after 10 PM local time on May 8 is the deciding data point. If that discussion revises the overnight low guidance above 77°F or below 76°F, the leading bracket loses its edge immediately.

Scientific Context

Miami’s climate in early May sits in a transitional period between the dry season and the onset of summer convection. The National Weather Service Miami climatological record shows the average overnight low at Miami International Airport in the first two weeks of May runs between 70°F and 78°F, with the median near 74°F. However, during years with a warm western Atlantic sea surface temperature anomaly, as South Florida is currently experiencing, overnight lows trend toward the upper end of that range. That context supports the 76-77°F and 78-79°F brackets over the lower-end alternatives. What would move this market before 2026-05-09 12:00:00 is a NWS forecast revision or an early morning surface observation showing the low already recorded before the noon resolution cutoff.

Frequently Asked Questions

• What does 51.5% probability mean here? The market assigns a 51.5% chance that Miami’s official overnight low on May 9 falls between 76°F and 77°F. That is essentially even odds with a slight lean toward YES.
• What pays out on the NO contract? Any official low temperature outside the 76-77°F window pays the NO side. That includes every other bracket from 71°F or below up through 90°F or higher.
• What data release moves this price? A National Weather Service Miami forecast update revising the overnight low guidance above or below the 76-77°F range would reprice this contract immediately before resolution.
• When does this contract resolve? Resolution is set for 2026-05-09 12:00:00. The official low from the National Weather Service Miami observation for May 9 determines the outcome.
• Is the volume reliable for price signals? Total volume is $3,128 and liquidity is $13,443. Both are thin. A single large trade can move the price significantly, so the 51.5% probability reflects limited trader participation rather than deep market consensus.

This analysis reflects market conditions as of 2026-05-08 05:12:09. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-05-09 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.