Highest temperature in Amsterdam on July 30?

Platform comparison

Market context

At Amsterdam Airport Schiphol Station, the market will settle on the **highest observed temperature** in Celsius during the day, so a YES share pays out if the final resolved bracket includes the actual daily maximum and a NO share does not. In plain terms, prediction-market traders are betting on which temperature range the official Wunderground history page will show as the day’s peak reading for Schiphol, not on the citywide average or the noon reading. [1][13]

The crowd-implied **0% YES** suggests traders see the current outcome as effectively impossible or not priced at all, but that should be read carefully because the contract is about a specific station and a single day’s maximum, which can still move with brief warm spells. July in Amsterdam is usually mild rather than extreme: typical late-July highs cluster around the low 20s Celsius, while historical data for Amsterdam shows average July highs around 21–22°C and occasional much hotter outliers. [2][5][6][8][9][10]

The main catalysts are weather observations and forecast updates, especially any short-lived surge in sunshine, southerly flow, or reduced cloud cover that could lift the afternoon peak before the market’s settlement window closes. Traders should watch near-real-time forecast shifts from established weather services, because these contracts can reprice quickly when expected highs change, and the resolution source is the Schiphol history page rather than a broader Amsterdam forecast. [1][3][11][13]

Sources: 1 · 2 · 3 · 4 · 5

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

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.

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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Market UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.