Paris July 4 Low Temp: Will 13°C Hit?

Paris temperatures on July 4 have the market split almost exactly down the middle. The 13°C outcome is trading at 51.5% implied probability, a margin thin enough that a single updated forecast can reprice this contract overnight. That is not indecision. That is genuine meteorological uncertainty at a two-day forecasting horizon.

The market question asks: what will the lowest temperature in Paris be on July 4? The 13°C outcome carries a YES price of 0.52 and a NO price of 0.49. The contract resolves at 12:00 UTC on July 4, 2026. Total volume stands at $6,598, all of it traded in the last 24 hours.

How the Paris July 4 Temperature Contract Works

This contract resolves YES if the official lowest temperature recorded in Paris on July 4, 2026 equals exactly 13°C. Alternative outcomes include 12°C, 14°C, 15°C, 16°C, 11°C or below, and several higher readings up to 21°C or above. Resolution follows official market sources tied to observed meteorological data for Paris.

• YES (13°C): priced at 0.52, implying a 51.5% probability of hitting exactly that threshold.
• NO (not 13°C): priced at 0.49, reflecting the combined probability of any other outcome across eleven alternative brackets.

The NO side wins if Paris records any temperature other than exactly 13°C as its daily low. With eleven competing outcomes splitting the NO probability, the market is effectively betting that one specific degree bracket edges out a crowded field. That structural reality is what makes 51.5% meaningful here, not just a coin flip.

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Momentum and Market Signals

The momentum composite tells a directional story. The 1-hour price change of plus 2.5% combined with a trend score of 37.93 points to modest but real buying pressure on the 13°C outcome. The most likely driver is updated short-range numerical weather prediction models, which refresh every six hours and tend to move these micro-temperature markets sharply as resolution approaches.

Total volume sits at $6,598, with all of that activity occurring in the last 24 hours. Liquidity is $19,028, which is healthy relative to the volume level. Still, at under $1 million in total volume, this market can reprice sharply on a single updated forecast or a large individual trade. Open interest reads zero, meaning all current positions are either new or fully offset.

• The 1-hour gain of plus 2.5% with a trend score near 38 points to incremental confidence in the 13°C outcome, likely tracking forecast model convergence.
• The 24-hour volume of $6,598 equals total volume, confirming this market opened and filled entirely within the last day.
• Liquidity of $19,028 against $6,598 in volume means order book depth is roughly three times traded size, a relatively comfortable spread for a small market.
• The price moved from 0.38 at open to 0.52 as of the writing date, a 36% rise, reflecting growing consensus around the 13°C bracket.
• Thin absolute volume means a single informed trade, perhaps from someone with access to high-resolution local forecast data, could push this contract meaningfully.

Lines Analysis: Paris Overnight Low Mechanics

Here is what the measurements are telling us. July overnight lows in Paris typically fall in the 13°C to 16°C range during early July, based on long-run climatological norms. The 13°C bracket sits at the cooler end of that range. A modest trough of low pressure or a clear-sky radiative cooling night can push the Parisian low toward 12-13°C even in summer. Current European weather patterns in early July 2026 will determine whether that scenario materializes.

What makes the NO side real is the breadth of alternative outcomes. The 14°C bracket likely carries the second-highest individual probability, and on most average July nights in Paris, 14°C or 15°C is the more climatologically typical floor. If a warmer airmass sits over northern France on the night of July 3 into July 4, the low temperature misses the 13°C bracket entirely and lands one degree higher. That is the specific condition that collapses the YES price.

• European Centre for Medium-Range Weather Forecasts model output for July 3 to July 4 in Paris is the single most important data input. Any shift toward a warmer surface low will reprice this contract immediately.
• Clear skies overnight on July 3 favor radiative cooling and push the low toward 13°C or below. Cloud cover holds heat in and lifts the floor toward 14-15°C.
• Meteo-France official observations at Paris-Montsouris station will serve as the resolution benchmark. That station has a consistent multi-decade record for Paris urban temperatures.
• Wind direction matters. Northerly flow into Paris advects cooler air from higher latitudes. Southwesterly flow, typical of Atlantic ridge patterns, keeps overnight lows elevated.
• Any significant convective activity on July 3 evening, thunderstorms or heavy showers, can cool the boundary layer sharply and push the low toward or below 13°C.

The data doesn’t care about the politics, and in this case there are no politics. There is a forecast model and a thermometer. With $6,598 in total volume, this market is pricing genuine meteorological uncertainty across a narrow temperature band two days before resolution. The balance of signals currently favors 13°C, but the margin is thin enough that a single updated model run could flip it.

LINES VERDICT

NARROW LEAN TOWARD THIRTEEN DEGREES CELSIUS

The market has priced the 13°C outcome as the single most probable bracket, and the momentum data supports that lean. But with eleven competing outcomes and a climatological norm that slightly favors 14°C on typical early July nights, this is a genuine toss-up inside a narrow thermal window.

What the market says: The 51.5% implied probability translates to a slight edge for the 13°C outcome over any single alternative. With resolution on July 4 and thin volume below one million dollars, this price will move sharply on any model update between now and then.

Key unknown: The next European Centre for Medium-Range Weather Forecasts or Meteo-France model run covering the night of July 3 to 4 in Paris is the single data point that will reprice this contract. Cloud cover and wind direction forecasts for that overnight window are the variables to watch.