Highest temperature in Amsterdam on August 17?

Platform comparison

Market context

On 17 August 2026, the highest temperature recorded at Amsterdam Airport Schiphol will fall into one of several defined ranges. A YES share in this market pays out if the temperature reaches a specific threshold; a NO share pays if it does not. The market's 0% crowd probability suggests traders currently expect the temperature to remain below whatever range this particular market is testing. Resolution depends on the Daily Observations table from Weather Underground rather than summary figures, a distinction that matters because station instruments sometimes record microvariations that summaries omit.

Amsterdam's August climate typically peaks between 20–24°C, though heat waves can push readings into the high 20s or low 30s. Historical August records at Schiphol show temperatures occasionally exceeding 30°C during European heat events, most recently in 2022 when the Netherlands experienced sustained warmth. The current zero probability suggests the market is calibrated to a threshold well above typical August conditions—possibly 35°C or higher—making it a tail-risk contract rather than a baseline weather forecast.

Traders monitoring this market should track European weather pattern forecasts from mid-August 2026, particularly whether Atlantic low-pressure systems or continental high-pressure domes dominate the region. The UK Met Office and KNMI (Royal Netherlands Meteorological Institute) publish extended outlooks that typically become more reliable 10–14 days before the event. Any significant heat-dome development across northern Europe in early-to-mid August would be the primary catalyst shifting probability away from zero.

Methodology

This page reviews Highest temperature in Amsterdam on August 17? 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 Prediction Market UK, 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.

UK Frequently Asked Questions

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 Prediction Market 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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.