Highest temperature in Amsterdam on July 30?

Platform comparison

Market context

Polymarket is pricing this Amsterdam Schiphol temperature contract at **0% YES** for every listed outcome today, so the market is effectively saying it sees no credible path to a specific range being resolved before the window closes. That matters because the contract settles on the **highest temperature recorded at Amsterdam Airport Schiphol Station** on 30 July 2026, with resolution based on the Wunderground daily history page, and payouts are handled through Polymarket’s USDC-settled, Polygon-based conditional tokens. In practical terms, traders are not betting on the abstract weather in Amsterdam city centre, but on the exact station reading that will land in one of the allowed Celsius bands.

For context, late-July Amsterdam usually sits in the low- to mid-20s Celsius on a warm day, while the city’s recorded extremes show that proper heat is possible but uncommon. Historical and climatological references put typical July highs around 21°C to 22°C, with record summer spikes well above 35°C in exceptional events; Amsterdam’s July record high is listed at 35.8°C in 2025, underscoring that the upper tail exists even if most outcomes are clustered far lower. That framing explains why a zero-priced book can still be vulnerable if synoptic conditions shift suddenly: in weather markets, a small change in air mass, wind direction, or cloud cover can move the terminal reading by several degrees and push the contract into a different band.

The main catalysts to watch are official short-range forecasts, any heat warnings from the KNMI, and whether a warm plume from the south-west reaches the Randstad before the midday cut-off implied by the settlement window. For a noon UTC resolution point, traders should focus on the latest forecast runs and airport-specific observations rather than city averages, because Schiphol can differ from central Amsterdam by a degree or more. If the day stays cloudier, wetter, or windier than expected, the highest temperature may remain anchored in the low 20s; if clearing and advection arrive early, the higher ranges become more plausible.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Amsterdam on July 30? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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.

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 PolyGram. 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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.