Highest temperature in Paris on June 22?

Platform comparison

Active sub-markets

Market context

Paris is set to face a significant heatwave this week, with temperatures expected to climb sharply from Sunday through Tuesday, potentially reaching 35 to 38°C as forecast by the national weather agency[3]. This real-world event directly frames the prediction market on the highest temperature at Paris-Le Bourget Airport on 22 June 2026, where the current crowd-implied probability for a "YES" outcome sits at 0%, despite strong external signals of extreme heat.

Historical data shows that June in Paris typically sees daily highs between 69°F and 74°F, rarely exceeding 84°F, yet recent years have broken these norms with unprecedented heat streaks, including a May 2026 record of 33°C[2][6]. The highest recorded temperature in Paris remains 42.6°C from July 1947, but the 2022 heatwave and the 45.9°C record in southern France last Friday demonstrate that extreme temperatures are becoming more frequent[4][7]. These comparable cases suggest that the 0% probability may be an underestimation given the current meteorological trajectory.

Traders should monitor the official Météo-France bulletins and real-time updates from Wunderground, which will serve as the settlement source for this market[1]. The agency has already confirmed a considerable temperature rise starting Sunday, with peaks likely to persist until Tuesday, making the 22 June date a critical window for record-breaking conditions[3]. No major announcements are pending, but the continuous influx of live weather data will be the primary catalyst for odds shifts across platforms.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Paris on June 22? 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

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 Best Prediction Markets UK, 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 Best Prediction Markets UK?

Zero. Best Prediction Markets UK 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, Best Prediction Markets UK 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.