Highest temperature in Amsterdam on August 15?

Platform comparison

Market context

Amsterdam's highest temperature on 15 August 2026 will be measured at Schiphol Airport's official meteorological station and recorded in Weather Underground's Daily Observations table. The settlement mechanism explicitly prioritises this granular dataset over the summary Day High & Low figures, which means traders need to verify data directly rather than relying on rounded or adjusted figures that sometimes appear in secondary displays. This distinction matters operationally: automated resolution systems querying Wunderground's API must target the correct endpoint to avoid settlement disputes.

August temperatures in Amsterdam typically range between 17–23°C, with extremes rarely exceeding 28°C. Historical data from the past two decades shows only three instances of temperatures above 30°C in mid-August at Schiphol, all occurring during broader European heat events in 2003, 2010, and 2018. The current 0% crowd probability reflects baseline expectations for a mild-to-warm summer day rather than an exceptional heat episode. Traders evaluating this market should cross-reference seasonal forecasts and European pressure patterns as August 2026 approaches; the absence of early signals for an extreme event explains the flat probability distribution.

Programmatically, this market rewards conditional order logic tied to medium-range weather model updates. European Centre for Medium-Range Weather Forecasts (ECMWF) and Deutscher Wetterdienst (DWD) forecasts become actionable roughly 10–14 days before settlement. Traders integrating weather APIs should monitor Schiphol's station identifier (IATA: AMS) and establish alerts for forecast anomalies; a sudden shift towards 25°C+ predictions would signal meaningful probability movement. The settlement window closes at midday UTC, creating a final data-locking point after morning observations.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Review UK, which mirrors the Polymarket order book directly.

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 Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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%.