Miami Lowest Temp May 12: Will It Hit 78-79°F?

Miami’s overnight low on May 12 is one of those deceptively simple markets that gets complicated fast. The 78-79°F outcome sits at 48.5% implied probability, but the NO side holds a slim edge at 0.52. That gap tells you traders are not settled. The 24-hour price surge of 26.5% means someone moved conviction sharply in the last day, and the question is whether the meteorological data backs that move.

This market resolves at 2026-05-12 12:00:00, meaning the window is closing fast. Miami’s overnight lows in mid-May cluster in the upper 70s historically, but sea surface temperatures, wind direction, and overnight cloud cover can push that number in either direction. The 78-79°F band is the modal outcome, but it is competing against 80-81°F and 76-77°F for trader dollars, and total volume is only $8,523.

How the Miami Overnight Low Contract Works

This contract resolves YES if Miami’s verified lowest temperature on May 12 falls between 78°F and 79°F inclusive. The resolution source is market resolution, meaning the final reading comes from a designated weather station or agreed data provider. Eleven outcome bands are available, from 69°F or below to 88°F or higher. Traders pick one band and either the temperature lands there or it doesn’t.

• 78-79°F (primary outcome): YES at 0.49, NO at 0.52, implied probability 48.5%
• 80-81°F: competing band, warmer outcome
• 76-77°F: competing band, cooler outcome
• 72-73°F, 70-71°F, 69°F or below: low-probability cool outcomes
• 82-83°F, 84-85°F, 86-87°F, 88°F or higher: low-probability warm outcomes

Missing the 78-79°F band doesn’t require extraordinary conditions. A persistent onshore flow from the Atlantic can hold overnight lows at 80°F or above through latent heat from warm water. Conversely, a dry northerly wind trailing a weak pressure gradient can drop lows into the upper 70s or even mid-70s. The band is narrow: two degrees. That’s why the market is split nearly 50-50.

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Momentum and What the Market Is Signaling

The 26.5% gain in 24 hours combined with a flat 1-hour change and a trend score of 64.60 reads as a burst of conviction that has now stalled. That pattern usually means a weather model update or a new forecast run shifted trader positioning, and the market is now waiting to see if the next model cycle confirms the move. Here’s what the measurements are telling us: the 78-79°F band attracted a sharp influx of capital yesterday, but the momentum has not continued into today’s early hours.

Total volume of $8,523 is thin. The $5,635 in 24-hour volume represents most of the market’s lifetime trading compressed into a single day, which confirms this is a late-breaking, short-duration weather market rather than a deep liquid contract. Liquidity sits at $3,802, meaning a single meaningful trade could reprice the YES outcome by several percentage points before resolution. Thin liquidity means price can move sharply on new data, and with hours left before the 12:00:00 cutoff, that risk is real.

• 1h change of +0.0%: momentum has paused after the 24-hour surge, suggesting the market is waiting rather than chasing
• 24h change of +26.5%: a sharp single-day move that opened at 0.22 and pushed toward 0.49, driven by forecast alignment with the 78-79°F band
• Trend score 64.60: above neutral but not extreme, consistent with a market that found a position and is now holding
• Volume below $10,000: thin market; any new forecast update in the next few hours could move the price sharply
• Open interest at $0: all positions are either closed or this reflects data timing; monitor for late-session accumulation

Lines Analysis: Miami Temperature on May Twelve

The case for 78-79°F landing is grounded in Miami’s climatological baseline. Mid-May overnight lows in Miami average between 74°F and 78°F, with the upper end of that range more common in years when Atlantic sea surface temperatures run above normal. In 2026, Atlantic SSTs have remained elevated, which biases overnight lows toward the warmer end of the distribution. The 78-79°F band sits right at the intersection of climatological expectation and current atmospheric setup, which is why it attracted the most capital.

The band fails if Miami’s overnight low overshoots into the 80-81°F range, which happens when cloud cover traps heat and southerly flow off warm water prevents radiative cooling. It also fails if a drier, slightly cooler air mass drops overnight lows into the 76-77°F range, which is the second most likely competing outcome. Two degrees of separation from two competing bands is the core risk in this market. The data doesn’t care about the politics of which way traders positioned; the thermometer will read what it reads.

• National Weather Service Miami: final forecast for tonight’s low is the single most important signal; check for any updates within the next two hours
• Atlantic SST anomaly data: persistent warmth above normal biases overnight lows toward 78-79°F and above
• Wind direction at Miami International: southerly or southeasterly flow favors warmer lows; northerly flow favors cooler readings
• Cloud cover overnight: thick marine layer traps heat and pushes lows toward 80°F+; clear skies allow cooling toward 76-77°F

With $8,523 in total volume and hours left, the market is pricing uncertainty, not science. The 48.5% probability is honest: this is genuinely a coin-flip outcome within a narrow two-degree band. The meteorological setup favors the upper 70s, but the competing bands on either side are close enough that a single forecast revision could reprice everything before the 12:00:00 cutoff.

LINES VERDICT

Narrow Band, Thin Market, Late Clock

The 78-79°F outcome holds the modal probability in a multi-band market, but the split nearly 50-50 between YES and NO reflects genuine meteorological uncertainty in a two-degree window with hours remaining.

What the market says: 48.5% probability that Miami’s overnight low lands exactly in the 78-79°F band on May 12, with the NO side holding a marginal edge at 0.52 and resolution at 2026-05-12 12:00:00 making any price move from here extremely time-sensitive.

Key unknown: The National Weather Service Miami’s next forecast update for tonight’s low is the single data point that would reprice this contract. Any shift of one degree in the official forecast toward 80°F or 76°F collapses the YES probability and shifts capital to competing bands.

Scientific Context and Historical Baseline

Miami’s May 12 overnight lows over the past decade have ranged from 72°F to 82°F, with the most common readings clustering between 76°F and 80°F. The 78-79°F band represents the approximate median of that distribution. Elevated Atlantic SSTs in 2026 push the expected value slightly warmer, which is consistent with the market’s late move toward YES. However, short-term weather variability on any single night can easily span four to six degrees, meaning climatological base rates give useful context but do not determine a single-night outcome.

Before 2026-05-12 12:00:00, the only events that would meaningfully move this contract are a revised NWS overnight low forecast, an unexpected shift in overnight wind direction, or a rapid change in cloud cover as observed on radar and satellite. No other data release is relevant at this resolution timescale.

Frequently Asked Questions

• What does 48.5% probability mean here? It means traders collectively assign roughly even odds that Miami’s verified overnight low on May 12 falls in the 78-79°F range specifically, not that temperatures will be warm generally.
• What happens if the low is 80°F? The 78-79°F contract resolves NO, and capital shifts to whichever band captures 80°F. Traders holding the 80-81°F band collect; everyone else does not.
• What single event would move this market most? A National Weather Service Miami forecast revision for tonight’s overnight low, published within the next two hours, is the most likely repricing catalyst before resolution.
• When does this contract resolve? Resolution is at 2026-05-12 12:00:00, meaning the overnight low reading must be established and verified by that cutoff.
• Is the $8,523 volume reliable for pricing? No. Total volume this thin means the YES/NO price spread reflects a small number of trades. A single new position of a few hundred dollars could shift the implied probability by several points before resolution.

This analysis reflects market conditions as of 2026-05-12 02:10:24. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-05-12 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.