Highest temperature in Paris on August 5?

Platform comparison

Market context

Paris-Le Bourget Airport is the source for the day’s peak temperature, so the question is whether the station’s highest reading on 5 August finishes inside a given Celsius band rather than merely whether Paris feels hot in general. For a programme-driven trader, that means polling the Wunderground history page through the day, then mapping the live maximum to the market’s settlement buckets; in practice, the key variable is the eventual daily high, not the morning forecast. Current crowd pricing at 0% YES implies the market is effectively treating a qualifying outcome as out of reach, which is hard to reconcile with the seasonal baseline for Paris.

August normals in Paris are usually in the low-to-mid 20s Celsius, with some services showing typical daytime highs around 23–26°C and around 29°C for 5 August in the near-term forecast set. Recent coverage has also shown France’s summer heat risk can escalate sharply, with Reuters reporting French weather officials warning of record-high temperatures during the June 2026 heat wave and Paris itself reaching 40.9°C in that event. That history matters because a single hot spell can move a daily-maximum market several bands higher than the seasonal average, especially when the settlement rule is tied to the station’s absolute peak for the day.[2][7][10][18]

A trader watching this programmatically should track three things: the latest Paris forecast, any Météo-France heat alerts or model upgrades, and the intraday Wunderground maximum for LFPB as it updates through the afternoon. Sortiraparis’ 3–9 August outlook pointed to dry, sunny weather around 29°C on Wednesday 5 August, which is compatible with a moderate daily high but not with the kind of spike needed for upper bands.[12] For automated workflows, that makes the market more about model drift and realised midday heating than about one-off headline risk, with the final read hinging on whether the airport station’s observed maximum overshoots the pre-event forecast.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 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.

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.