Highest temperature in Amsterdam on August 16?

Platform comparison

Market context

Amsterdam Airport Schiphol will record a daily maximum temperature on 16 August 2026, measured via the station's meteorological instruments and logged in Weather Underground's Daily Observations table. The market settles on whichever temperature band captures that peak reading in degrees Celsius, with resolution tied explicitly to Wunderground's primary data feed rather than summary figures.

Historical August temperatures at Schiphol show a median high around 22–23°C, though the station has recorded peaks exceeding 30°C during heat waves. The 0% crowd probability suggests traders are pricing in either a technical misunderstanding of the settlement mechanics or extreme confidence that August 2026 will fall well outside historical norms. Comparable European weather markets typically see non-trivial probability mass across multiple temperature bands when settlement windows remain open beyond six months; the current flat reading warrants scrutiny of whether the market has attracted sufficient liquidity or if early participants have anchored on an outlier assumption.

Traders should monitor European weather forecasting updates from mid-August 2026 onwards, particularly any alerts from KNMI (Royal Netherlands Meteorological Institute) regarding heat advisories or anomalous pressure patterns. Funding rates and spot positioning in weather-derivative markets on competing platforms may signal institutional positioning ahead of the settlement window close on 16 August at 12:00 UTC. Any significant deviation from seasonal norms in late July or early August could trigger repricing; USDC settlement ensures traders can hedge or unwind positions without currency friction.

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

UK Frequently Asked Questions

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

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%.