Highest temperature in Amsterdam on August 17?

Platform comparison

Market context

Amsterdam's daily maximum temperature on 17 August 2026 will be measured at Schiphol Airport, with resolution tied specifically to the Weather Underground Daily Observations table rather than summary figures. This distinction matters for programmatic resolution: the Daily Observations granular dataset often captures peak readings that summary sections round or omit, creating potential discrepancies that automated systems must account for when querying the API or scraping historical records.

August temperatures in Amsterdam typically range between 20–25°C, though heat waves occasionally push readings above 30°C. The 2003 European heat wave saw Amsterdam reach 30.2°C in mid-August; more recently, August 2022 recorded a peak of 31.4°C during an extended warm spell. Current crowd probability at 0% suggests the market is pricing in either a narrow resolution band (likely 20–24°C) or reflects low liquidity rather than genuine conviction about August conditions. Traders using conditional orders or bot-based monitoring should establish alerts tied to seasonal weather pattern shifts—particularly blocking high-pressure systems that typically drive continental heat into the Low Countries.

The European summer forecast window remains open, but traders tracking this market should monitor ECMWF and DWD model updates from late July onwards, when 10–14 day forecasts become more reliable. Historical volatility in August temperature ranges means the current 0% probability may shift materially once forecasts crystallise in early August. For systematic traders, integrating Weather Underground's API directly into backtesting workflows allows comparison of Daily Observations versus Day High & Low discrepancies across prior years, establishing empirical baselines for resolution risk.

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.

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%.