Madrid July 5 High: Will 39°C Hit the Mark?

Madrid is sitting at the center of a narrow-band temperature bet that resolves in roughly 48 hours. The market has priced 39°C at 56.5% probability, making it the consensus outcome for July 5. But with a spread of outcomes ranging from 35°C or below all the way to 45°C or higher, the precision required here is unusually tight. One degree in either direction erases the payout.

The market question asks: what will be the highest temperature recorded in Madrid on July 5, 2026? The 39°C outcome is priced at 0.57 YES and 0.44 NO, with total volume at $5,005 and resolution set for July 5, 2026 at 12:00 UTC. That resolution timestamp is notable: midday UTC is 2 p.m. Madrid local time, which means the market may close before the true daily maximum is recorded.

How the Contract Works: One Degree, One Winner

This market resolves on a single discrete temperature outcome. YES pays if Madrid’s official highest temperature on July 5 lands exactly at 39°C. Every other outcome, whether 38°C, 40°C, or any other listed bracket, is a separate contract. The resolution source is the market itself, which typically draws on official Spanish meteorological agency (AEMET) station data for Madrid.

• YES (39°C) is priced at 0.57, implying a 56.5% probability.
• NO (any other outcome) is priced at 0.44, implying a 43.5% probability.

The NO side covers a wide range of adjacent outcomes. Madrid’s July high missing 39°C happens if a stronger heat pulse pushes the reading to 40°C or above, or if cooler Atlantic influence holds the peak at 38°C or lower. AEMET’s forecasting record for Madrid in early July shows frequent deviation of one to two degrees from five-day model consensus. That range is exactly what makes this contract competitive.

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Momentum and Market Signals: A Sharp Move on Thin Volume

The momentum composite here is a clear bullish signal. The 39°C contract jumped roughly 11% from its open price, with a confirmed 1-hour gain of 1.5% on July 3. The trend score of 36.83 reflects recent directional conviction, most likely driven by updated European Centre for Medium-Range Weather Forecasts (ECMWF) or AEMET model output pointing toward a mid-to-upper 30s peak for July 5.

Total 24-hour volume is $5,005, which is the entire lifetime volume of this market. Liquidity stands at $53,181, a healthy order book relative to trading activity. Volume below $10,000 means this contract can reprice sharply on a single updated forecast run. One AEMET bulletin or a revised ECMWF ensemble could move this market several percentage points in either direction before resolution.

• The 1-hour gain of 1.5% and the 11% move from open both point toward accumulating confidence in the 39°C outcome, likely anchored to recent model data.
• Liquidity at $53,181 is strong relative to volume, meaning the order book can absorb moderate new positions without slippage.
• Total volume of $5,005 is thin by prediction market standards. New model output or an AEMET advisory would carry outsized price impact here.
• The trend score of 36.83 sits in moderate-bullish territory, not extreme conviction, leaving meaningful room for repricing.
• The resolution timestamp of 12:00 UTC on July 5 is 14:00 Madrid local time. Madrid’s daily peak typically occurs between 15:00 and 17:00 local. This mismatch is a structural risk for resolution accuracy.

Lines Analysis: What the Data and the Calendar Are Telling Us

The 39°C outcome sits at the statistical center of Madrid’s early July temperature distribution. AEMET historical records for Madrid in the first week of July show daily highs clustering between 36°C and 41°C, with the 38°C to 40°C band accounting for a large share of observations. The current pricing of 56.5% for exactly 39°C is plausible but aggressive for a single-degree bracket. The market is essentially betting the models land precisely on one number.

What makes the NO side real is the precision problem. AEMET forecasts for five-day horizons in Madrid carry model uncertainty of roughly plus or minus 2°C. A heat ridge arriving slightly earlier or stronger pushes the reading to 40°C or 41°C. A late Atlantic trough delays the peak or caps it at 38°C. Either shift pays out on a different contract, not this one. The 39°C bracket wins only in a fairly narrow atmospheric scenario.

• AEMET issuing an updated forecast showing a 39°C to 41°C range for July 5 would support the current pricing, but the upper bound matters.
• ECMWF ensemble runs narrowing toward 40°C or above would pressure the 39°C contract and boost the 40°C bracket instead.
• Any Atlantic weather system or Saharan dust plume disruption changing the temperature trajectory before July 5 would reprice this market quickly.
• The 12:00 UTC resolution cutoff is the single biggest structural factor. If Madrid’s peak occurs after 14:00 local, resolution may use an incomplete daily record.

The $5,005 in total volume reflects a market that attracted interest fast but remains lightly traded. The data modestly favors YES at current pricing, but the combination of single-degree precision, thin volume, and an early resolution cutoff makes this contract more volatile than the headline probability suggests.

LINES VERDICT

NARROW EDGE, STRUCTURAL RISK

The 39°C outcome has the best single-bracket probability in this market, but the precision required and the early resolution cutoff create real exposure that the headline number understates.

What the market says: At 56.5%, the market treats 39°C as the most likely single outcome for Madrid on July 5, but with more than four in ten contracts paying on something else, this is a competitive field. Thin volume means any updated AEMET or ECMWF output before July 5 could move the price sharply.

Key unknown: The ECMWF ensemble run and AEMET official forecast update for July 5 are the critical data points. A shift of even one degree in model consensus toward 40°C or 38°C would substantially reprice this contract before resolution.