Miami May 26 Low Temp: Can 78-79°F Hold?

Late May in Miami is not a mystery. The city sits at the edge of the tropics, and by the final week of May, overnight temperatures rarely dip below the upper 70s. The market is pricing a 40.5% chance that the lowest temperature on May 26 lands in the 78-79°F range. That is the leading outcome across eleven brackets, but it is far from a lock. Neighboring brackets are pulling real money too.

The market question asks: what will Miami’s lowest recorded temperature be on May 26, 2026? The primary outcome of 78-79°F sits at $0.41 YES and $0.60 NO. The market resolves at noon on May 26. Total volume stands at $2,719, with $984 traded in the last 24 hours.

How the 78-79°F Contract Works

This is a bracket market, not a binary yes/no on a single event. Each temperature range is its own contract. A YES on 78-79°F pays out only if Miami’s official low temperature on May 26 falls between 78°F and 79°F, inclusive. A NO pays out if the low falls anywhere outside that range, including one degree higher or lower.

• YES (78-79°F): priced at $0.41, implying a 40.5% chance the low lands in this exact bracket.
• NO: priced at $0.60, reflecting a 59.5% chance the low falls outside 78-79°F entirely.

The NO side wins whenever Miami’s overnight low climbs to 80°F or higher, or drops to 77°F or below. In late May, the greater risk is warmth. A persistent onshore flow or elevated sea surface temperatures in Biscayne Bay can keep overnight lows stubbornly above 80°F. The meteorological barrier here is not cold air. It is whether any marine layer or brief cloud break keeps the city cool enough to register in the 78-79°F window rather than ticking up into the 80-81°F bracket.

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Momentum and Market Signals

The trend score sits at 57.54, a modest lean toward the primary outcome without strong directional conviction. No 1-hour or 24-hour price change data is available, so the momentum picture is limited to that baseline trend reading. The most likely driver of any price shift before resolution is an updated National Weather Service forecast for Miami overnight into May 26.

Total volume is $2,719. The 24-hour volume of $984 shows active engagement for a short-duration weather contract, but this is a thin market. Liquidity reads at $22,530, which is healthy relative to volume, but with total volume under $3,000, a single moderate-sized trade can move the price meaningfully. The market is pricing uncertainty, not science, and a fresh NWS model run showing a warmer or cooler overnight could reprice this contract quickly.

• The trend score of 57.54 signals a mild lean toward the 78-79°F bracket without strong conviction from either side.
• The 24-hour volume of $984 is moderate for a one-day weather contract, but total volume below $3,000 means thin liquidity risk is real.
• No whale trades have been recorded, so price reflects retail-level positioning rather than large informed capital.
• The 80-81°F bracket is the primary competitor, capturing traders who expect Miami’s overnight low to stay warmer than the leading bracket.
• Resolution on May 26 at noon means any late forecast update or overnight temperature reading directly reprices the contract in real time.

Lines Analysis: Miami’s Late-May Temperature Baseline

Miami’s climatological record for late May strongly supports overnight lows in the upper 70s to low 80s. The National Weather Service Miami forecast office uses a combination of sea surface temperature data, low-level jet positioning, and the Bermuda High’s influence on surface winds to project overnight minimums. In a typical late-May pattern, onshore southeast flow keeps overnight lows warm. The 78-79°F bracket sits right at the lower edge of what late May normally produces, making it plausible but not dominant.

The competing 80-81°F bracket is the real threat to a YES payout here. When Miami’s sea surface temperatures run above their seasonal average, the marine boundary layer holds warmth well into the overnight hours. Any persistent cloudiness or elevated dewpoints can push the low above 80°F with ease. The specific meteorological condition that sends the 78-79°F contract to zero is a warm, moist overnight with light winds and no radiative cooling. That is a common Miami May scenario.

• National Weather Service Miami: an updated forecast showing an overnight low at or above 80°F would sharply reprice the 78-79°F contract downward.
• Sea surface temperature anomalies in the Florida Straits: elevated SSTs directly support warmer overnight lows and favor the 80-81°F bracket.
• Wind direction and speed overnight May 25-26: a shift to lighter winds or calmer conditions could allow brief radiative cooling into the 78-79°F range.
• Convective activity: any thunderstorm activity in the hours before the overnight minimum can temporarily drop temperatures into the leading bracket.
• Final NWS hourly observation from Miami International Airport: this is the official resolution data point and the single most watched number.

Total volume of $2,719 reflects a market that is engaged but not deeply capitalized. The data favors a close race between the 78-79°F and 80-81°F brackets. Late-May Miami climatology supports the warmer bracket as slightly more likely, which aligns with the 59.5% NO pricing on the primary outcome.

LINES VERDICT

Narrow Bracket, Real Competition from the Warmer Side

The 78-79°F bracket leads the field, but Miami’s late-May climatology and typical onshore flow patterns give the 80-81°F range a credible claim on a similar probability share.

What the market says: A 40.5% implied probability means traders see the 78-79°F bracket as the most likely single outcome but assign a 59.5% chance to any other result. With resolution in under 24 hours and total volume below $3,000, this price is sensitive to a single NWS forecast update.

Key unknown: The National Weather Service Miami’s final overnight forecast for May 25-26 is the single data point that will reprice this contract. A model consensus at 80°F or higher sends the NO side higher. A cooler run pointing to 78-79°F tightens the spread fast.

Scientific Context: Miami’s Late-May Overnight Temperature Patterns

Miami’s mean daily minimum temperature in late May historically falls between 75°F and 79°F, based on long-term National Weather Service climatological normals. In recent years, elevated Atlantic sea surface temperatures have pushed observed overnight lows toward the upper end of that range and occasionally above it. The 78-79°F bracket sits at the climatological midpoint for this time of year, which is exactly why it attracts the most market interest. Before resolution, any NWS advisory, updated model output, or hourly temperature observation from Miami International Airport could shift the distribution of trader probability across all eleven brackets.

What is the 40.5% probability actually saying?

A 40.5% implied probability means the market assigns roughly a two-in-five chance that Miami’s official overnight low on May 26 falls exactly between 78°F and 79°F. The remaining 59.5% is spread across ten other temperature brackets.

What pays out on the NO side of this contract?

The NO contract on 78-79°F pays out if Miami’s low temperature on May 26 lands anywhere outside that two-degree window. Any reading at 80°F or above, or 77°F or below, resolves NO as a winner.

What data or event would move this contract’s price?

A National Weather Service Miami forecast update showing a likely overnight low above 80°F would push the NO price higher and reduce YES probability. A thunderstorm forecast or cooler air mass would do the opposite.

When does this contract resolve?

The market resolves at noon on May 26, 2026, based on the official lowest temperature recorded in Miami during that period.

Is the volume here reliable for reading market conviction?

Total volume of $2,719 is thin. Liquidity of $22,530 provides order book depth, but a single trade of a few hundred dollars can visibly shift the YES price. Treat this pricing as directional signal, not precise probability.