Highest temperature in Paris on May 23?

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Market context

On 23 May 2026, the highest temperature recorded at Paris-Le Bourget Airport will determine the settlement outcome for this market. The resolution will draw from Wunderground's historical weather database, capturing the peak daily temperature in Celsius across all daylight and evening hours at this principal meteorological station serving the Paris region.

May temperatures in Paris typically range between 15–22°C, with historical data showing that days exceeding 25°C occur in roughly one-third of May seasons. The 0% crowd-implied probability suggests traders are pricing this market as if no outcome bracket has been selected or the market structure remains incomplete. Comparable European weather markets on prediction platforms show meaningful divergence when settlement sources and temperature thresholds are ambiguous; clarity on which specific temperature range constitutes the YES outcome is essential before meaningful odds can form. Historical May records for the Paris region peak around 28–30°C during heat waves, though such extremes remain uncommon for late spring.

Traders monitoring this contract should track European weather forecasting updates as May 2026 approaches, particularly from Météo-France and the European Centre for Medium-Range Weather Forecasts. Atmospheric patterns in late April and early May will signal whether high-pressure systems or Atlantic weather systems dominate the region. The settlement window closes at midday UTC on 23 May, meaning final temperature readings will be confirmed within hours of market closure. Cross-platform comparison with other weather derivatives or sportsbook temperature props, should they exist, would reveal whether the current 0% reflects genuine market indifference or incomplete market initialisation.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.