Highest temperature in Paris on June 23?

Platform comparison

Active sub-markets

Market context

The underlying real-world event is a record-breaking heatwave currently sweeping France, with daytime highs forecast to exceed 40°C in Paris this week. This extreme thermal surge has triggered a red alert from the national weather agency, marking conditions that could rewrite the June temperature record books[2][4]. The current crowd-implied probability of 0% for the "YES" outcome on the Polymarket contract reflects a market consensus that the specific resolution range for 23 June 2026 is unlikely to be met, despite the broader heat anomaly dominating the on-chain narrative[3].

Historical context from early June 2026 shows Paris typically experiencing mild, changeable skies with daytime temperatures hovering between 21°C and 23°C, far below the current extremes[1]. However, the catalyst for traders to watch is the sustained duration of this heat dome, which meteorologists predict will persist until the end of the week, pushing temperatures well above the seasonal average of 93°F (34°C)[3][7]. Recent reports from Euronews confirm that Paris has already shattered its June record at 38.4°C, with forecasts suggesting a potential peak of 40°C by mid-week, a threshold unprecedented for this month[4][8].

Traders should monitor the official Wunderground data stream for the Paris-Le Bourget Airport Station, as the market resolves strictly on the highest temperature recorded for all times on 23 June 2026[2]. The on-chain mechanics utilise USDC on the Polygon network, where conditional tokens allow precise exposure to this temperature range outcome. While the heatwave is severe, the 0% probability suggests the market believes the specific resolution bracket for the 23th will not align with the forecasted peak, even as the broader event continues to dominate European weather patterns[5][6].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Paris on June 23? 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

Is this market available outside the US?

Polymarket Legit? 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.

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.

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.