Miami July 3 High Temp: Will 90-91°F Hold?

Miami enters July 3 with its temperature forecast splitting the market almost evenly. The 90-91°F bracket holds a 46.5% implied probability, but the NO side holds a slight edge at 53.5%. That gap reflects genuine meteorological uncertainty, not a settled consensus. Here’s what the measurements are telling us: South Florida’s July climatology clusters tightly around the low 90s, and small forecast deviations shift money between adjacent brackets fast.

The market question asks whether Miami’s highest recorded temperature on July 3 lands specifically in the 90-91°F range. The YES price sits at $0.47, the NO price at $0.54, and the contract resolves at 2026-07-03 12:00:00. Total volume is $3,831, with $3,841 traded in the last 24 hours and $40,591 in liquidity backing the order book.

How the 90-91°F Contract Works

A YES resolution requires Miami’s official daily high on July 3 to land at exactly 90°F or 91°F, nothing more and nothing less. The contract resolves against Polymarket’s stated resolution source. Adjacent brackets, including 92-93°F and 88-89°F, each represent a separate, competing contract.

• YES ($0.47, 46.5% implied): Miami’s daily high on July 3 registers 90°F or 91°F.
• NO ($0.54, 53.5% implied): Miami’s daily high falls outside the 90-91°F range, landing in any other bracket from 81°F or below to 100°F or higher.

The NO outcome is not a single forecast. Any temperature outside 90-91°F resolves NO. Miami could hit 93°F and NO wins. Miami could hit 88°F and NO wins. The NO side benefits from the combined probability of every other temperature bracket, which is a structural advantage in any narrow-range market.

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Momentum and Market Signals

The 1-hour price change is flat at 0.0%, and the trend score sits at 53.63, tilting slightly toward NO but without conviction. The market has been stable since open, with no significant price movement driven by forecast revisions or weather alerts. The data doesn’t care about the politics, and right now, the data is telling traders to wait for the National Weather Service’s updated Miami forecast before committing hard in either direction.

Total volume of $3,831 is thin. With under $1M traded, this market is vulnerable to sharp price swings on any updated forecast or NWS advisory. A single large bet could move the price meaningfully before resolution. Liquidity at $40,591 is deeper than volume suggests, which means the order book can absorb moderate trades, but the low volume still signals limited conviction from the broader trader base.

• The 1-hour and 24-hour price signals both show no directional momentum, pointing to a market waiting on weather data rather than reacting to it.
• The trend score of 53.63 gives the NO side a marginal lean, consistent with the structural advantage of covering all non-90-91°F outcomes.
• Volume below $1M means a single forecast update or large trade could shift the YES price by several cents quickly.
• Liquidity at $40,591 is adequate but not deep enough to prevent volatility if a clear forecast emerges before resolution.
• The 30-day price range of $0.42 to $0.47 shows the YES contract has drifted upward modestly, suggesting some accumulation around the primary bracket.

Lines Analysis: Miami’s July High and the Narrow Target

Miami’s July climatology favors highs in the low 90s. The 90-91°F bracket is the modal forecast range for early July in South Florida, which is why the market prices it as the single most likely outcome among ten competing brackets. NOAA’s historical data for Miami International Airport shows July daily highs averaging around 91°F, placing the 90-91°F range squarely at the center of the distribution.

The structural challenge for YES is precision. Even if 90-91°F is the most probable single bracket, the combined probability of all other brackets is higher by definition. A modest increase in sea surface temperatures in the Florida Straits, a shift in the Bermuda High, or an onshore flow pattern could push the high to 92°F or 93°F. Afternoon convection, which is common in Miami in July, often caps daytime highs by pulling cloud cover over the region earlier than expected. That could suppress the high to 88°F or 89°F, handing NO the win from the opposite direction.

• The National Weather Service Miami forecast for July 3 is the single most important data point. Any update showing a high of 92°F or above reprices YES lower fast.
• Sea surface temperature anomalies in the Florida Straits above +1°C support highs at the upper end of the distribution, favoring 92-93°F over 90-91°F.
• Early afternoon convection development, typical in Miami summers, can suppress highs and push the outcome toward the 88-89°F bracket.
• The Bermuda High position influences onshore flow intensity. A stronger ridge supports higher daytime temperatures and increases risk of YES being undercut by 92-93°F.
• Any tropical disturbance in the western Atlantic affecting South Florida would introduce significant downside temperature risk, shifting probability sharply toward lower brackets.

The market is pricing uncertainty, not science. With $3,831 in total volume, this is a lightly traded contract where the NWS afternoon forecast update carries outsized weight. The 90-91°F bracket has the best single-outcome probability, but NO holds the edge by aggregating every alternative. The data tilts toward the center of the distribution, but the margin is narrow.

LINES VERDICT

NARROW MISS RISK

The 90-91°F bracket is the most probable single outcome for Miami on July 3, but thin volume and a nearly even split reflect real forecast uncertainty in a two-degree window.

What the market says: At 46.5% implied probability, the market has not reached a confident conclusion. With resolution arriving on July 3, any NWS forecast update or observed temperature deviation will move this price sharply given the low volume.

Key unknown: The National Weather Service Miami forecast update for July 3 afternoon high is the single data point that will reprice this contract. A forecast of 92°F or above or 89°F or below would shift significant probability away from the YES bracket immediately.