Miami Low Temp June 10: Can 78-79°F Hold at 42%?

Miami sits at the edge of Atlantic hurricane season, and its overnight lows in early June tell a story the weather models have been arguing about all week. The 78-79°F band holds a 41.5% implied probability heading into tomorrow’s resolution. That makes it the single most likely outcome in a multi-bucket market with eleven possible ranges, but it is far from a consensus call. The market has moved sharply today, up nearly 10% on June 9, suggesting late-breaking confidence in this temperature window.

The market question asks for the lowest recorded temperature in Miami on June 10, resolving at noon on June 10, 2026. The YES price sits at 0.42 and NO at 0.59, with total volume at $2,694 and liquidity at $20,295. That volume is thin. In a low-volume environment, a single large trade or a new forecast update can reprice this contract significantly before the noon deadline.

How the Miami Low Temperature Contract Works

This contract resolves YES if Miami’s official low temperature on June 10 falls between 78°F and 79°F inclusive. The National Weather Service Miami office, which reports to NOAA, supplies the official observation. Any reading outside that two-degree band resolves the 78-79°F contract as NO, and one of the ten alternative buckets collects.

• YES (78-79°F): priced at 0.42, implying a 41.5% probability that the official low lands in this exact range.
• NO (any other outcome): priced at 0.59, covering ten alternative buckets from 69°F or below up to 88°F or higher.

The NO side wins whenever the Miami low falls outside the 78-79°F window. In early June, Miami’s average overnight low runs near 76-78°F, so the 80-81°F bucket is the most credible alternative. A warmer-than-average Atlantic sea surface temperature or a stalled low-pressure system pushing overnight warmth could push the reading into the 80-81°F range. Equally, a brief mid-Atlantic trough dropping southward could shave the low into the 76-77°F bucket. Both scenarios resolve this contract as NO.

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Momentum and Market Signals

The 1-hour price change of +5.0% combined with a trend score of 59.24 and the intraday move of roughly 9.5% on June 9 point to a single driver: updated short-range forecast models published in the 24 hours before resolution. When temperature market prices jump like this the night before resolution, it typically means the operational forecast (the GFS or NAM model) has converged on a specific overnight low, and traders are reacting. The movement is directionally bullish for the 78-79°F outcome.

Total volume is $2,694, and 24-hour volume matches that figure, meaning almost all activity is from today alone. Liquidity at $20,295 is healthy relative to volume, so the order book can absorb moderate trades. But with volume well below $1M, this market is thin. One significant new trade or a 6pm NWS forecast update could move the price sharply before the June 10 noon resolution.

• The 1-hour price change (+5.0%) and June 9 intraday gain suggest forecast models are tightening around the 78-79°F range as of this morning.
• A trend score of 59.24 is modestly bullish but not strong enough to indicate conviction. The market is pricing probability, not certainty.
• Total volume of $2,694 means thin liquidity dynamics apply. New forecast data or a single institutional trade could reprice this contract by 5-10 percentage points.
• The 80-81°F bucket is the primary competing outcome given early June climatology and current Atlantic sea surface temperatures running above average.
• Resolution at noon June 10 gives the market less than 27 hours to respond to any new NWS forecast update or observed overnight low.

Lines Analysis: Miami Temperature Market

Here’s what the measurements are telling us. Miami’s June climatology puts the average overnight low near 77-78°F. The current pricing of 41.5% for the 78-79°F band is consistent with that climatology. The NWS Miami area forecast discussion, updated multiple times daily, is the single most predictive input for this contract. If the 5pm or 11pm forecast package on June 9 pins the overnight low at 78°F, the YES price should climb further. The sharp June 9 intraday move suggests at least one forecast update has already pushed traders in that direction.

What keeps the NO side alive is the spread of outcomes above and below. The 80-81°F bucket benefits from above-average Atlantic sea surface temperatures this season, which elevate overnight marine air temperatures across South Florida. A weak onshore flow or increased cloud cover overnight could trap warmth and push the low above 79°F. That single-degree shift is enough to resolve this contract NO. The data doesn’t care about the politics of climate attribution. What matters here is whether the NWS surface observation at Miami International Airport or the official measuring station crosses 80°F before sunrise on June 10.

• NWS Miami forecast discussion updates at 5pm and 11pm ET on June 9 are the most direct price-moving data for this contract.
• If the operational GFS model shifts the overnight low above 79°F, the 80-81°F bucket gains value and this contract loses ground.
• Atlantic sea surface temperature anomalies running 1-2°C above average this June support a warmer overnight low, favoring the upper buckets.
• Any frontal passage or increased wind shear overnight could mix the boundary layer and suppress the low, favoring 76-77°F and moving price against YES.
• The official resolution observation comes from a specific NOAA-designated station. Station-level anomalies, not city-wide averages, determine the outcome.

The market is pricing uncertainty, not science. Total volume of $2,694 reflects a niche short-duration weather contract rather than a deep liquid market. The 41.5% implied probability for 78-79°F is reasonable given Miami’s June climatology, but thin volume means this price is fragile. The data favors a YES resolution based on current forecast convergence, but the NO side has legitimate pathways through the 80-81°F and 76-77°F buckets.

LINES VERDICT

Narrow Favorite in a Multi-Outcome Field

The 78-79°F bucket is the most likely single outcome, but winning a multi-bucket market at 41.5% means NO collects more than half the probability. The June 9 price surge signals forecast convergence, but the thin volume makes this price unreliable as a precision indicator.

What the market says: A 41.5% implied probability means traders see the 78-79°F band as the most probable single outcome but assign the majority of probability to other temperature ranges. With resolution in under 27 hours, any NWS forecast update could reprice this contract sharply.

Key unknown: The NWS Miami 11pm forecast discussion on June 9 is the single most important input. If that forecast pins the overnight low at 78-79°F, this contract should move significantly higher before the June 10 noon resolution.

Scientific Context

Miami’s early June climate is defined by high humidity, warm Atlantic sea surface temperatures, and the onset of the wet season. Overnight lows in this period typically range from 76°F to 80°F, with the median near 78°F. Above-average sea surface temperatures in the western Atlantic and Gulf of Mexico, documented by NOAA buoy data through May 2026, push the probability distribution toward the upper buckets (80-81°F and above). That context supports the sharp June 9 price movement but also explains why the 80-81°F bucket remains the most credible alternative. The NWS Miami Climate Office publishes daily climatological normals, and the June 10 normal overnight low sits at approximately 77°F, one degree below the bottom of the YES range. That single-degree gap is the core tension in this market.

What would move price before resolution: A NWS forecast update shifting the expected overnight low above 80°F would collapse YES pricing. A forecast pinning the low at 78-79°F with high confidence would push YES above 0.50. Any observed temperature in the 78-79°F range at the official station by 6am June 10 would essentially confirm resolution.

What is the 41.5% probability mean for this contract?

It means traders assign a roughly two-in-five chance that Miami’s official overnight low lands exactly in the 78-79°F band. Ten other outcome buckets share the remaining 58.5%.

What pays out if the low is 80°F?

The 78-79°F contract resolves NO. The 80-81°F bucket would resolve YES. Each temperature range is a separate contract on Polymarket.

What data release most affects this market?

The NWS Miami forecast discussion, updated at 5pm and 11pm ET on June 9, is the most direct price-moving input. Model updates from the GFS and NAM operational runs also matter.

When does this market resolve?

Resolution is set for noon on June 10, 2026. The official overnight low is typically recorded by sunrise, so the resolution observation will likely be available hours before the noon deadline.

Is the volume reliable for reading market conviction?

Total volume of $2,694 is very thin. The liquidity of $20,295 is larger, but with volume this low, the 41.5% price reflects a small number of trades and can shift sharply on new information.