Highest temperature in Paris on June 26?

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Market context

The real-world event centres on the peak temperature recorded at Paris-Le Bourget Airport on 26 June 2026, a date falling squarely within the warm season that typically runs from mid-June to early September. Current crowd-implied probability of 0% for any specific high-temperature range suggests the market expects conditions to remain well below historical extremes, likely due to prevailing overcast skies and light rain forecast for the preceding day, which often suppresses peak daytime heating.

Historical precedents frame this low probability credibly: while France shattered heat records in June 2019 with 40.9°C in Paris and 42.4°C elsewhere, such extremes are rare outliers rather than norms. The average high for June at Le Bourget sits around 23°C, and recent data shows today’s high is only 21°C with 90% rain probability, reinforcing the market’s conservative stance. Traders approaching this programmatically should monitor Wunderground’s hourly updates for the airport station, as conditional orders could be triggered by sudden shifts in cloud cover or wind direction.

Key catalysts include the scheduled sunset at 9:58 PM and any unexpected announcements from Météo-France regarding heatwave alerts, though no such warnings are currently active. A recent report from Ara.cat confirms the 40.9°C June record remains unbroken in 2026, further validating the 0% probability for extreme ranges. Power-users should track real-time pressure drops and humidity spikes, as these dependencies directly influence peak temperature outcomes on this specific day.

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Methodology

We track Highest temperature in Paris on June 26? 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

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Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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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.