Paris Low Temperature on May 25: Will It Hit 19°C?

Paris overnight temperatures in late May sit in a narrow band. The city’s historical low for May 25 clusters between 13°C and 18°C, with occasional warm nights pushing into the 19°C to 20°C range during mild Atlantic-influenced spells. Right now, the market puts 19°C at 40% probability. That gap between the leading outcome and a coin flip tells you something: traders see the number as plausible but not dominant.

The market question asks for the lowest temperature in Paris on May 25, resolving at 12:00 UTC on May 25, 2026. The current yes price sits at 0.40 (40% implied probability) against a no price of 0.60. Total volume stands at $3,288, with $1,869 traded in the last 24 hours. Liquidity is $7,429. This is a thin market. Sharp single trades can move this price meaningfully before resolution.

How the Paris Low Temperature Contract Works

This contract resolves YES if the official lowest temperature recorded in Paris on May 25, 2026, equals exactly 19°C. Any other reading, whether 18°C, 20°C, or any temperature listed among the ten alternatives, pays out to the corresponding outcome contract instead. The resolution source is market resolution, with the reading locked in at the 12:00 UTC cut-off.

• YES (19°C): priced at 0.40, implying a 40% chance the overnight low lands exactly on this threshold.
• NO field (all other outcomes combined): priced at 0.60, covering 20°C, 18°C, 17°C, 21°C, 16°C, 15°C, 22°C or higher, 12°C or below, 13°C, and 14°C.

The no-payout scenario is straightforward: any reading other than exactly 19°C fails this contract. Paris overnight lows in late May cover a wide range. A cooler Atlantic trough could push readings to 15°C or 16°C. A warm southerly flow could lift the minimum above 20°C. The competing outcomes split the remaining 60% probability across ten buckets, which is why no single alternative commands a dominant share.

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Momentum and Market Signals

The trend score sits at 63.09, leaning modestly toward yes momentum, though without confirmed 1-hour or 24-hour price change data, the directional driver is likely weather model updates rather than any single news event. European weather forecasting centers typically update medium-range guidance every 12 hours, and late-May Paris temperatures are sensitive to upper-level ridge positioning over Western Europe. Any shift in the 850 hPa temperature forecast for the Paris basin would reprice every outcome bucket simultaneously.

Total volume is $3,288 with $1,869 in the last 24 hours. Liquidity is $7,429. These are thin-market conditions. Volume below $1 million means the price can move sharply on a single trade or a decisive forecast update. Treat the 40% probability as a snapshot, not a settled signal.

• The trend score of 63.09 points to mild yes-side pressure, likely tied to current European weather model guidance.
• The 24-hour volume of $1,869 confirms active but small-scale trading, consistent with a short-duration weather market approaching resolution.
• Liquidity of $7,429 means the bid-ask spread can widen quickly if a large position enters before the 12:00 UTC close.
• Trader sentiment leans bearish at 40% YES versus 60% NO, suggesting more participants see 19°C as unlikely to be the exact reading.
• The absence of whale trades removes any large-capital directional signal. This market is driven by retail weather traders and model-watchers.

Lines Analysis: What Drives the Paris Low on May 25

The 19°C outcome sits above Paris’s climatological median low for late May, which typically falls between 12°C and 15°C. For 19°C to resolve YES, Paris needs a notably warm night, one where a persistent southerly or southwesterly flow prevents radiative cooling. Météo-France and ECMWF model output for May 24 to 25 would be the primary data source. If the 850 hPa temperature anomaly over northern France runs two to three degrees above normal on the night of May 24, the overnight low could reach 19°C. That scenario is plausible but not the climatological base case.

The 60% probability assigned to all other outcomes reflects how many ways this market can fail to land on 19°C exactly. A cooler-than-expected Atlantic trough, a clear sky overnight allowing radiative cooling, or a surface wind shift could each push the low to 17°C or 18°C. Equally, a stronger warm advection event could overshoot to 20°C or 21°C. Precision temperature markets like this one are structurally noisy: even if the forecast median is 19°C, the actual reading has a spread of two to three degrees in either direction.

• ECMWF and Météo-France 48-hour guidance for Paris overnight temperatures on May 24 to 25 is the single most important data input. Any shift in that forecast would immediately reprice all outcome contracts.
• Upper-level ridge positioning over Western Europe determines whether warm southerly advection or Atlantic cool air dominates on the night of May 24.
• Sky cover forecast matters. A clear night favors radiative cooling and lower minimums. Cloud cover acts as a thermal blanket and supports higher overnight lows.
• Paris urban heat island effect provides a modest floor. Dense urban surfaces retain heat and push overnight lows slightly higher than surrounding rural areas.
• Wind speed and direction after midnight on May 25 will be the final arbiter. Light winds favor cooling; southerly flow above 10 knots supports elevated minimums.

Total volume of $3,288 is modest for a precision weather market. The data currently supports 19°C as the single most likely individual outcome, which is why it carries the highest price in the field. But with ten competing outcomes splitting the remaining 60%, the market is effectively saying: something other than 19°C is more likely in aggregate. Here’s what the measurements are telling us: the atmosphere does not resolve to a single integer on demand, and thin liquidity means this price will move fast if forecasts shift in the next 12 hours.

LINES VERDICT

MOST LIKELY SINGLE OUTCOME, NOT MOST LIKELY EVENT

The market has priced 19°C as the single leading outcome in a ten-way field, but the data does not favor any one reading with conviction. The 40% probability reflects leadership in a fragmented field, not true dominance.

What the market says: At 40% implied probability, traders see 19°C as the most likely single temperature but assign a 60% collective chance to every other outcome. With resolution in under 24 hours and thin liquidity, any forecast update from Météo-France or ECMWF can move this price sharply.

Key unknown: The 18:00 UTC ECMWF model run on May 24 and the Météo-France overnight bulletin for the Paris basin are the critical data points. A half-degree shift in the forecast minimum either way would reprice this market and its adjacent outcome contracts.

Scientific Context

Late May climatology for Paris (Montsouris station) shows overnight lows averaging near 12°C to 14°C, with warm years pushing minimums to 17°C or 18°C. A reading at 19°C places Paris in the warm tail of its historical distribution for this date. European spring 2026 has tracked warmer than the 1991 to 2020 baseline across much of the continent, which slightly elevates the prior probability of warm overnight readings. Still, 19°C represents a specific threshold in a distribution with meaningful variance. The market is pricing uncertainty, not science: the atmosphere will deliver exactly one number, and the forecasting models carry a residual error of one to two degrees for 24-hour minimum temperature predictions. Events that would move this price before resolution include any Météo-France special advisory, a significant shift in the GFS or ECMWF ensemble mean, or an observed afternoon temperature in Paris running notably above or below seasonal norms on May 24.

Will the Paris low land at exactly nineteen degrees Celsius?

At 40% implied probability, the market treats this outcome as the most probable single reading but far from certain. Thin volume means this price can move fast.

What makes the no side pay out?

Any observed minimum temperature in Paris on May 25 other than exactly 19°C pays out to one of the ten alternative outcome contracts. The no collective covers everything from 12°C or below through 22°C or higher.

What data event would move this price most?

An updated Météo-France or ECMWF forecast for Paris overnight lows on May 24 to 25, especially any run shifting the predicted minimum above 20°C or below 18°C, would immediately reprice this market.

When does this contract resolve?

Resolution is set for May 25, 2026, at 12:00 UTC. The market locks in on the official observed low for Paris on that date.

Is the volume here reliable enough to trust the price?

Total volume of $3,288 and 24-hour volume of $1,869 are thin. Liquidity of $7,429 means a single mid-sized trade can shift the price noticeably. Treat the 40% probability as directional, not precise.