Highest temperature in Paris on June 23?

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Market context

On 23 June 2026, Paris-Le Bourget will face its peak summer heat, with the market asking whether the day’s highest temperature will breach a specific threshold. The crowd-implied probability of a “YES” is currently 0%, reflecting a consensus that extreme heat is unlikely. This stance aligns with historical patterns: June highs in Paris typically range from 20–24°C (69–74°F), rarely exceeding 29°C (84°F) [1]. While France has recorded extremes like 42.4°C in July 2019 [2], such events are outliers, usually tied to late-summer heatwaves rather than mid-June conditions.

Traders should monitor upcoming meteorological forecasts and any regional heatwave alerts issued by Météo-France, as these can shift expectations rapidly. Recent analysis of the 2022 heatwaves notes that early warnings often precede record-breaking days [6]. Additionally, watch for shifts in wind patterns from the south, which can transport warmer air into the Île-de-France region. If a heatwave is forecasted for late June, the value may lie in contrarian positions betting on higher temperatures, even if the current consensus remains dismissive. The settlement window closes at 12:00 UTC on 23 June 2026, so timing is critical.

Sources: 1 · 2 · 3 · 4 · 5

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 Who Will Win, which mirrors the Polymarket order book directly.

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.

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FAQ

Where can I trade this market with the lowest fees?

On Who Will Win, 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.

Is this market available outside the US?

Who Will Win is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What does it cost to trade on Who Will Win?

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

Do I need to KYC for this market?

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

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.