Highest temperature in Paris on May 26?

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Market context

Paris-Le Bourget Airport is forecast to experience typical late-May conditions on 26 May 2026, with meteorological models currently suggesting a high between 18–22°C depending on cloud cover and wind patterns. The 0% crowd probability reflects genuine uncertainty rather than a consensus that extreme heat is impossible; late spring in the Île-de-France region remains volatile, with temperature swings of 8–10°C common between successive days.

Historical May records at Le Bourget show the station has recorded highs exceeding 28°C in late May on multiple occasions, most notably 29.4°C on 28 May 2003 and 28.6°C on 25 May 2009. The 30-year average maximum for late May sits around 20–21°C, placing the current forecast near seasonal norms. Traders should note that spring heatwaves in northern France, whilst less frequent than summer extremes, do materialise roughly once every 5–7 years during this period, making outcomes above 25°C statistically plausible rather than exceptional.

The key catalyst is the Atlantic pressure pattern developing over the coming fortnight. Météo-France's extended outlook, updated twice weekly, will clarify whether a ridge of high pressure builds northward into France by late May or whether Atlantic lows dominate. Current ensemble models show divergence, with some runs favouring warmer continental air and others indicating cooler maritime influence. Traders should monitor the 10–14 day forecast updates from 17–20 May, when deterministic signals typically strengthen and the probability distribution narrows considerably.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Today, which mirrors the Polymarket order book directly.

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.

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.

What does it cost to trade on Prediction Today?

Zero. Prediction Today routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.