Highest temperature in Paris on June 30?

Platform comparison

Market context

The real-world event hinges on the highest temperature recorded at Paris-Le Bourget Airport on 30 June 2026, measured in degrees Celsius and resolved via Wunderground data. Current crowd-implied probability sits at 0% for any temperature range exceeding the baseline, suggesting traders expect conditions to remain well within typical June bounds. Historically, late June in Paris rarely breaches 35°C; the station’s record for this period is 42.4°C, logged on 25 July 2019 during an exceptional heatwave, while the national thermal indicator hit 29.8°C on 23 June 2026 during a red-alert heat event across France[5]. Such extremes are outliers, not norms, framing the 0% probability as a rational assessment of seasonal likelihood.

Traders should monitor daily Met Office forecasts for Paris-Le Bourget, which currently predict a maximum daytime temperature of 28–30°C with sunny conditions and light northerly winds[1]. The key catalyst is the persistence of the red-alert heatwave that began earlier in the week; if it intensifies or lingers, temperatures could spike unexpectedly. A recent NPR report confirms France recorded its hottest day ever on 23 June 2026, with temperatures reaching 29.8°C nationally, though Paris-Le Bourget itself registered 21°C at 6:30 pm that day[5][2]. Programmatically, this market would be approached by setting conditional orders tied to Wunderground’s hourly updates, triggering exits if the 30-minute rolling average exceeds 32°C. No announcements or schedules are pending, but the heatwave’s trajectory remains the sole dependency.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Paris on June 30? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Fees, which mirrors the Polymarket order book at 0% fees.

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

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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 Fees 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.