Highest temperature in Amsterdam on August 17?

Platform comparison

Market context

Amsterdam's weather on 17 August 2026 will be determined by mid-summer atmospheric patterns typical of the Netherlands at that time of year. August temperatures in Amsterdam historically range between 17–23°C on average, though daily highs can exceed 25°C during warm spells. The 0% crowd probability suggests traders are pricing in either exceptionally cool conditions or uncertainty about which specific temperature band will materialise on that date.

Historical August records for Amsterdam Airport Schiphol show that temperatures above 30°C occur roughly once every five to ten years during the month, whilst readings above 25°C are common. The settlement mechanism relies on Weather Underground's Daily Observations table rather than summary figures, which can occasionally diverge; this distinction matters for edge cases near temperature thresholds. Comparable August dates from recent years (2023 saw highs of 26–28°C; 2022 reached 32°C) illustrate the range of plausible outcomes nearly two years ahead.

Traders monitoring this market should track seasonal weather pattern forecasts as August 2026 approaches, particularly Atlantic pressure systems and any anomalous heat patterns developing across northern Europe in the weeks prior. Long-range climate models become more reliable within 10–14 days of the target date. The current zero probability likely reflects the difficulty of meaningful prediction at this temporal distance rather than a genuine consensus that cool conditions are certain.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Today. 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%.