Highest temperature in Paris on May 31?

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Market context

Paris-Le Bourget Airport's highest temperature on 31 May 2026 will depend on whether a high-pressure system remains anchored over western Europe or if Atlantic weather systems push through northern France. Late May typically sees the transition from spring to early summer conditions, with Paris averaging daily highs around 20–22°C, though temperatures can exceed 25°C during settled spells. Current atmospheric patterns suggest variable conditions heading into late May, with no exceptional heat anomalies forecast in the extended outlook as of early 2026.

Historical records for Paris on 31 May show considerable variation. The station's data reveals that temperatures on this date have ranged from lows near 10°C to highs exceeding 28°C depending on the year's weather pattern. A review of comparable late-May conditions over the past two decades indicates that days with maxima above 26°C occur roughly once every three to four years, whilst readings above 30°C are rare but not unprecedented during particularly warm springs. The 0% crowd probability suggests traders are pricing in either very specific temperature thresholds or treating this as a placeholder market awaiting clearer seasonal forecasts.

Traders should monitor European weather models from mid-May onwards, particularly the position of the jet stream and any developing ridge of high pressure over the continent. Météo-France's extended forecasts, typically issued with reasonable confidence 10–14 days ahead, will provide the clearest signal for whether May 31 falls within a warm or moderate spell. Soil moisture conditions and any preceding heatwaves across mainland Europe will also influence whether Paris experiences above-average temperatures on that specific date.

Methodology

We track Highest temperature in Paris on May 31? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Prediction Today, 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, Prediction Today triggers a quick verification flow that finishes in minutes.