Highest temperature in Paris on June 30?

Platform comparison

Market context

The highest temperature recorded at Paris-Le Bourget Airport on 30 June 2026 will determine the outcome of this on-chain prediction market, which currently prices the 29°C range at 100% probability while the 24°C or below bracket sits at 0%. Traders on Polymarket are using USDC on the Polygon network to back conditional tokens that resolve based on Wunderground data, reflecting a consensus that the post-peak cooling trajectory of the 2026 European heatwave will cap temperatures near 27–29°C.

Historical context from the current heatwave frames this pricing: France recorded its hottest day since 1947 on 23 June with 44.3°C in Pissos, while Paris itself hit nearly 41°C, yet daily averages have since declined as the heat dome weakens [2][9]. The current market leader of 29°C aligns with the post-peak cooling pattern observed after the 23 June peak, suggesting the 30 June reading will fall well below the record highs but remain above typical June averages of 84°F (29°C) [6].

Traders should monitor the Meteo-France daily bulletins and the European Centre for Medium-Range Weather Forecasts for any sudden shifts in the heat dome’s position, as red heat alerts remain active in northern Spain with temperatures potentially reaching 42°C [2]. The settlement depends entirely on the single highest reading at Paris-Le Bourget, so any unexpected cloud cover or wind changes from the Atlantic could alter the outcome, though current forecasts suggest stable, warm conditions persisting through the settlement window on 30 June at 12:00 UTC [3].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Kalshi UK, 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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.