Highest temperature in Paris on June 22?

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Market context

Paris is in the middle of a severe late-June heatwave, and the latest market move has been towards the upper end of the distribution rather than a modest summer high. Polymarket’s current pricing puts **37°C** and **38°C** almost level, at 49% and 48% respectively, which is a sharp signal that traders see little difference between the two most likely settlement bands.[1]

That fits the broader weather set-up: Reuters reported that Météo-France expected temperatures to climb from Sunday and remain elevated at least until Tuesday, with Monday potentially among the hottest days ever recorded in France.[4] On the historical side, Paris’s June climate usually peaks far below this range, so any reading in the high 30s is already an extreme outlier rather than a routine warm day.[3] The 0% YES implied probability is therefore hard to reconcile with the live weather backdrop, unless the market is using a different strike structure than the headline suggests.[1][3]

For traders, the key catalysts are the midday evolution of the heat plume, official Météo-France updates, and whether cloud cover or a coastal breeze trims the day’s peak at Paris-Le Bourget. Because the market settles on the *highest* temperature recorded at that station during the day, the answer can still change late if the maximum arrives after lunchtime; that makes the afternoon observation cycle and any last-minute forecast revision the main drivers.[1][4]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Paris on June 22? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Prediction Today — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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

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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.

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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.