Paris Lowest Temp July 10: Will It Hit Exactly 20°C?

Pinning a single degree on Paris’s overnight low two days out is genuinely hard. The market currently prices a 35% chance the lowest temperature recorded in Paris on July 10 lands exactly at 20°C. That is the leading outcome in a multi-option field, but it still means the market sees a 65% chance the answer is something else entirely.

The contract asks: what is the lowest temperature in Paris on July 10, 2026? Outcome options range from 16°C or below all the way to 26°C or higher. The 20°C outcome trades at $0.35 (35% implied probability), while all other outcomes combined represent $0.65. The market resolves at 12:00 UTC on July 10. Total volume is $13,621, all of it placed within the last 24 hours.

How the Paris Temperature Contract Works

This contract resolves to the outcome that matches the verified lowest temperature recorded in Paris on July 10, 2026. Only the outcome matching the actual recorded low pays out at $1.00. Every other outcome expires worthless. Resolution is determined by the temperature data source specified by Polymarket at close.

• 20°C (YES): $0.35 — 35% implied probability. Pays out if the official low equals exactly 20°C.
• All other outcomes (NO aggregate): $0.65 — 65% implied probability. Includes 21°C, 22°C, 19°C, 23°C, 17°C, 18°C, 24°C, 16°C or below, 25°C, and 26°C or higher.

The contract pays nothing for a near-miss. A low of 19.6°C that rounds to 20°C may or may not qualify depending on resolution methodology. Traders should read the exact resolution source before entering a position. The spread across eleven outcomes is the core risk here.

Market Signals Show Flat Momentum With Heavy Single-Day Activity

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Momentum across the 1-hour window shows zero movement, and 24-hour change data is not available as a comparable. The trend score sits at 37.62, which is below the midpoint and consistent with a market that opened, saw active trading, and has since stabilized without a clear directional push. The entire $13,621 in volume arrived in the current 24-hour window, meaning this market effectively just opened and traders moved fast. No sustained buying pressure is building for the 20°C outcome.

Liquidity stands at $38,570 against $13,621 in total volume. That ratio suggests the order book is reasonably deep relative to volume traded, but total volume is still well under $1 million. This is a low-liquidity market. A single large trade can move prices meaningfully before resolution.

• The 20°C outcome holds a 35% implied probability, making it the single most likely individual outcome but still a minority call across the full field.
• The 1-hour price change sits at flat (0.0%), and the trend score of 37.62 signals no accumulation in the most recent window.
• All $13,621 in volume landed in the current 24-hour period, pointing to a freshly active market with no established price history to lean on.
• Liquidity at $38,570 is healthy relative to volume but insufficient to classify this as a high-conviction institutional market.
• The eleven-outcome structure means even the leading option carries substantial uncertainty. A 35% probability is the market’s best single guess, not a consensus.

Lines Analysis: Paris in Early July and the Degree-Level Problem

Paris in early July historically sees overnight lows cluster between 17°C and 22°C, with the median around 19°C to 20°C. The market landing on 20°C as its top outcome is consistent with climatological priors for the date. European weather models for the July 10 window generally indicate a mild pattern without a strong cold or warm anomaly pushing toward the extremes. That keeps mid-range outcomes like 19°C, 20°C, and 21°C as the most defensible cluster.

The real risk for 20°C holders is not an extreme outcome. It is an adjacent one. If the recorded low comes in at 19°C or 21°C, the contract pays zero despite being one degree off. That adjacency risk is why the market prices 35% and not higher. The 19°C and 21°C outcomes each carry their own probability mass, and the combined weight of adjacent outcomes likely exceeds 20°C alone.

• A shift in the European model toward a warmer overnight pattern would push probability toward 21°C and 22°C, pressuring the 20°C price lower.
• A cooler-than-expected synoptic pattern moving over northern France before July 10 would lift 18°C and 19°C contracts at the expense of 20°C.
• Any forecast data published by Météo-France in the 48-hour window before resolution will be the single most important price driver.
• Thin volume means a single informed trader acting on updated forecast data could move prices significantly in the final hours.

The $13,621 in volume shows real trader interest in a very short-duration weather market. The data modestly favors the 20°C outcome as the highest individual probability, but the combined weight against it remains substantial. This market rewards precision, not direction.

LINES VERDICT

Highest Single-Outcome Probability, Still a Minority Call

The math doesn’t lie: 20°C is the market’s best single guess for Paris’s July 10 overnight low, but two-thirds of the probability mass sits elsewhere across ten competing outcomes. Here’s what the market is missing: adjacent-degree risk at 19°C and 21°C is the real competition, not the tails.

What the market says: 35% probability that Paris records exactly 20°C as its overnight low on July 10. With resolution arriving in roughly 48 hours, any updated forecast data before July 10 could shift this price quickly across the multi-outcome field.