What Will Paris’s Lowest Temp Be on July 9?

Paris temperature markets do not usually generate this kind of position spread. The lowest temperature contract for July 9 has settled into a 35% implied probability for the 20°C outcome, with the NO side holding a 65% implied probability across a field of ten alternative temperature bands. The math here is straightforward: this is a multi-outcome market, and 35% for a single degree band is actually a strong implied lead when the opposition is fragmented across a range from 18°C or below to 28°C or higher.

The market question asks whether Paris records a lowest temperature of exactly 20°C on July 9, 2026. The 20°C contract trades at $0.35 (35% implied probability). The NO side prices at $0.65. The market resolves at noon on July 9, 2026. Total volume stands at $3,297, all recorded in the last 24 hours.

How the Paris Temperature Contract Works

This contract resolves YES if the verified lowest temperature recorded in Paris on July 9, 2026 equals exactly 20°C. Any other recorded low, whether 19°C, 21°C, or outside that range, resolves the contract NO. Resolution depends on official meteorological data, not forecast models. The specific sensor reading on resolution day determines the outcome.

• 20°C (YES): $0.35 per share, 35% implied probability. Pays out if the Paris overnight low on July 9 is recorded at exactly 20°C.
• All other outcomes (NO): $0.65 per share, 65% implied probability. Covers 21°C, 19°C, 18°C or below, 22°C, 23°C, 24°C, 25°C, 26°C, 27°C, and 28°C or higher.

The NO position wins when Paris records any temperature other than 20°C as its July 9 low. Given that alternative outcomes span a ten-band range, the NO position captures a wide meteorological territory. A single degree of forecast error in either direction delivers a NO resolution.

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Market Signals: Thin Volume, Clear Directional Lean

Momentum is mildly negative. The 20°C contract slipped 0.5% in the last hour with a trend score of 35.91, placing this market in a mild selling-pressure zone. The 24-hour change is not separately available, but the full $3,297 in total volume moved within the last 24 hours, meaning this market opened and traded entirely within one day. Here’s what the market is missing: a trend score near 36 with light negative hourly movement suggests the 20°C thesis attracted early buyers and is now seeing modest profit-taking or repositioning, not a conviction reversal.

Total volume of $3,297 is thin by prediction market standards. Liquidity at $35,263 is actually deep relative to volume, meaning the order book can absorb significant new positions without moving the price dramatically. The 24-hour volume equals total volume, confirming this is a newly opened contract. Low volume on a short-duration weather market is expected, not a red flag. The math doesn’t lie: thin volume amplifies price swings but does not distort the underlying probability signal when liquidity is present.

• The 20°C contract momentum shows a 0.5% hourly decline with a trend score of 35.91, signaling mild selling pressure with no major catalyst.
• Total volume of $3,297 across all 24 hours suggests early-market price discovery is still underway, with the 20°C band attracting the most single-outcome interest.
• Liquidity at $35,263 is roughly ten times the traded volume, meaning large incoming positions will not spike the price significantly before resolution.
• The 1-hour price decline connects to July 9 approaching on the calendar: traders are updating positions as real-time forecast models refresh for the next 48-hour window.
• The multi-outcome structure means 35% for one temperature band is actually a dominant position when ten alternatives split the remaining 65%.

Lines Analysis: Paris in July and the Case for 20°C

Paris climatological data for early July shows overnight lows typically ranging from 15°C to 20°C, with warmer nights pushing into the low 20s during heat events. A 20°C overnight low sits at the upper end of the historical central range, meaning it occurs during mild-to-warm July nights rather than cool or extreme heat events. The 35% implied probability reflects genuine meteorological uncertainty across a narrow but plausible temperature band.

The alternative outcome risk is real and distributed. If Paris experiences a cooler night on July 8 into July 9, the low drops to 19°C or below, resolving NO. If a warm front holds overnight temperatures above 20°C, any reading of 21°C or higher also resolves NO. The contract has almost no margin for error: one degree in either direction ends the position. That precision is why the NO side commands 65% even when 20°C is the single most-probable individual outcome.

• A warming trend in the 48 hours before July 9 would push overnight lows toward 21°C or 22°C, pulling probability away from the 20°C band and pressuring the contract price lower.
• A cooler Atlantic air mass arriving over northern France before July 9 would drag the low toward 18°C or 19°C, also resolving NO and similar in directional effect.
• Forecast model convergence on 20°C in the next 24 hours would be the strongest single signal supporting the YES side, likely generating a price spike given thin volume.
• Official Meteo-France or European Centre for Medium-Range Weather Forecasts model updates in the 24 hours before resolution will be the primary price-moving catalyst.

Total volume of $3,297 is modest. The data leans toward the NO side by probability, but the 20°C band holds the strongest individual outcome position in a fragmented field. The market has priced genuine uncertainty accurately: this resolves on a single verified number with no room for interpretation.

LINES VERDICT

Fragmented Field, Narrow Target

The 20°C band leads all individual outcomes at 35%, but the one-degree precision requirement means a single degree of forecast error resolves the contract NO. The market has priced this correctly: the leading outcome is not the probable outcome.

What the market says: The 20°C contract sits at 35% implied probability, reflecting a plausible but precision-dependent outcome. With resolution in under 48 hours, any forecast model shift in the next day will move this price sharply given the thin $3,297 in total volume.