Miami Overnight Low: Will May 19 Hit Seventy-Six to Seventy-Seven?

Miami’s overnight temperatures in mid-May rarely generate headlines. But this contract, priced at 24% for a 76-77°F low on May 19, has quietly shed 10 points in 24 hours. The market is pricing uncertainty, not science. And right now, the atmospheric setup over South Florida is doing most of the talking.

The contract resolves at 2026-05-19 12:00:00. The primary outcome, a minimum temperature landing in the 76-77°F band, sits at 24%. The field is wide: eleven outcome buckets span 73°F or below all the way up to 92°F or higher. That spread tells you something. No single outcome commands conviction.

How This Contract Resolves

This market asks one question: what is Miami’s lowest recorded temperature on May 19, 2026? The resolution source tracks official meteorological readings for Miami. The contract pays YES if the overnight or early-morning low falls specifically in the 76-77°F range. All other outcomes pay NO.

• YES (76-77°F): $0.24 per share, implied probability 24%
• NO (all other outcomes): $0.76 per share, implied probability 76%

The NO position covers ten competing buckets. Miami’s overnight low landing at 78-79°F, 74-75°F, 80-81°F, or any other range outside 76-77°F all pay NO. That structural breadth makes NO the mechanical favorite here. The 76-77°F band is one of eleven possible outcomes. Even if it is the single most likely individual bucket, a 24% probability means three-quarters of traders expect the temperature to land somewhere else entirely.

Momentum and Market Signals

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The momentum composite points down. A flat one-hour change combined with a 10% drop over 24 hours and a trend score of 32.60 signals steady selling pressure. The most probable driver is updated National Weather Service forecasting for South Florida on May 18-19, which shifted trader expectations away from the 76-77°F band.

Total market volume sits at $2,545 with $709 traded in the last 24 hours. Liquidity stands at $17,474. Volume this thin means price can move sharply on a single updated forecast or a morning temperature reading. One weather model run can reprice this contract before resolution.

Key Factors

• The 24-hour price drop of 10% is the dominant signal. Traders moved away from the 76-77°F outcome after updated South Florida forecasts posted on May 17-18.
• The 1-hour price holding flat at 0.0% suggests the selling has paused. The market is waiting for the next forecast update.
• The trend score of 32.60 is below the midpoint. Bearish lean on this specific bucket is clear.
• Total volume of $2,545 is extremely low. Thin liquidity amplifies the price impact of any single forecast revision or early observational data.
• Miami’s typical overnight lows in mid-May historically cluster in the upper 70s. The 76-77°F bucket is plausible but not dominant in the distribution.

Lines Analysis: Reading the South Florida Setup

Here’s what the measurements are telling us. Miami’s overnight lows in mid-May typically range from the mid-70s to low 80s depending on wind direction, cloud cover, and antecedent moisture. A 76-77°F reading would represent a slightly cooler outcome than the climatological median for this date. National Weather Service Miami forecasts for May 19 will be the controlling input. If the forecast low sits above 78°F, the 76-77°F bucket loses ground fast.

The barrier for this outcome is specific. The temperature must fall into a two-degree window. A reading of 75°F or 78°F both pay NO. Warmer sea surface temperatures in Biscayne Bay and the Atlantic typically suppress overnight cooling in Miami during May. That thermodynamic floor makes sub-77°F readings possible but not the central tendency. The current 76% NO probability reflects that arithmetic directly.

Signals to Monitor Before Resolution

• National Weather Service Miami evening forecast on May 18: a predicted low above 78°F would push this bucket below 20%.
• NOAA’s hourly surface observations at Miami International Airport overnight May 18-19: the official low will come from this dataset.
• Any frontal passage or wind shift over South Florida: a dry northerly flow could push the low below 76°F, benefiting other buckets.
• Sea breeze patterns on May 19 morning: if the marine layer keeps temperatures elevated, the 78-79°F or higher buckets gain probability.
• Early morning temperature readings between 4-7 AM Eastern on May 19: those hours typically capture Miami’s overnight minimum.

The data doesn’t care about the politics, and it doesn’t care about market volume either. With $2,545 in total trades, this market is priced on thin consensus. The 24% probability for 76-77°F is a reasonable estimate given the climatological distribution, but it can reprice dramatically on a single NWS forecast update overnight. The current signal favors the broader NO field.

LINES VERDICT

NO Field Holds the Advantage

The 76-77°F bucket faces an eleven-outcome field, and updated South Florida forecasts pushed this price down 10% in 24 hours. The atmospheric setup and thin volume both favor the NO position holding through resolution.

What the market says: At 24%, traders assign roughly one-in-four odds to Miami’s May 19 low landing in the 76-77°F window. With resolution arriving at 2026-05-19 12:00:00, any forecast revision overnight could move this price sharply in either direction given the extremely low liquidity.

Key unknown: The National Weather Service Miami forecast issued on the evening of May 18 is the single most important input. A predicted low above 78°F or below 76°F would effectively reprice this contract before the first overnight temperature readings arrive.

Scientific Context: Miami’s May Temperature Distribution

Miami’s climate record places mid-May overnight lows most frequently in the 77-80°F range. The 76-77°F band sits at the cooler edge of the typical distribution. Urban heat island effects at Miami International Airport, where official readings are taken, tend to suppress overnight cooling relative to surrounding areas. That thermal baseline nudges probability toward the warmer buckets. The current 24% price for 76-77°F aligns reasonably with historical frequency. What would move price before 2026-05-19 12:00:00 is any shift in the NWS point forecast low, a surprise cold front passage, or an early observational reading that locks in the minimum before the market closes.

Frequently Asked Questions

• What does 24% probability mean here? It means traders estimate a roughly one-in-four chance that Miami’s official minimum temperature on May 19 lands between 76°F and 77°F exactly.
• What does the NO contract cover? NO pays out if Miami’s low falls in any of the ten other buckets: 73°F or below, 74-75°F, 78-79°F, 80-81°F, 82-83°F, 84-85°F, 86-87°F, 88-89°F, 90-91°F, or 92°F or higher.
• What data event would move this price most? The National Weather Service Miami evening forecast on May 18 is the primary catalyst. A shift in the predicted overnight low by even one or two degrees can reprice this contract significantly.
• When does this contract resolve? Resolution is set for 2026-05-19 12:00:00. The official Miami minimum temperature for May 19 determines the outcome.
• Is the $2,545 in volume reliable? No. Volume this low means the market is illiquid. A single trade of a few hundred dollars can shift the price meaningfully. Treat current probability as a rough estimate, not a deep consensus signal.

This analysis reflects market conditions as of 2026-05-18 17:20:23. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-05-19 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.