Highest temperature in Warsaw on July 27?

Platform comparison

Market context

Warsaw's highest temperature on 27 July 2026 will be recorded at Chopin Airport and binned into a range bracket. The settlement mechanism relies on Wunderground's historical weather database, which aggregates hourly readings from the airport station throughout the day. Traders resolving this programmatically will need to query the platform at or after the settlement window closes on 27 July at 12:00 UTC, then cross-reference the reported daily maximum against the market's predefined temperature bands.

Historical July temperatures in Warsaw cluster between 17–27°C for daily highs, with occasional excursions above 28°C during heat waves. The 0% crowd probability suggests either extreme confidence in a specific range or sparse liquidity across all brackets. Comparable European airport weather markets show that summer day-to-day variance typically exceeds 5°C, meaning adjacent temperature bands should carry meaningful probability mass. A trader building conditional orders would benefit from monitoring European weather model consensus (ECMWF, GFS) in the week prior, as these forecasts stabilise 5–7 days out and often determine whether a given range becomes the consensus outcome.

Catalysts include any significant heat dome or low-pressure system affecting Central Europe in late July. The UK Met Office and NOAA publish extended forecasts weekly; a shift in the jet stream position or Atlantic blocking patterns could materially alter the probability distribution across ranges. Automated systems should account for Wunderground's occasional data delays or corrections, which can occur 24–48 hours after the settlement window closes, potentially affecting final resolution timing.

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.

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 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 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.

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.