Highest temperature in Amsterdam on July 30?

Platform comparison

Market context

Amsterdam’s highest temperature is determined by the day’s maximum at Schiphol, so the market is really about whether the airport gets anywhere near a notably warm July finish rather than a city-centre reading. Historical Amsterdam extremes show that 30°C-plus outcomes are possible but infrequent: the city’s all-time high is 36.4°C, recorded in July 2019, while recent annual records have been lower, with 34.8°C in 2025 and 34.9°C in 2024 in nearby national datasets.[2][1][10]

Against that backdrop, a 0% crowd-implied probability is an extreme pricing signal and may reflect either stale liquidity, a very narrow temperature bucket, or the fact that traders are anchoring to the station-specific source rather than broader Amsterdam weather. On Polymarket, the market is generally read as an implied probability, whereas on Kalshi and Smarkets traders usually compare contract prices after fees; Betfair is typically quoted in decimal odds, so the same view can look cheaper or dearer once commission is included. Access also differs: Kalshi’s onboarding and availability are more restricted than Betfair or Smarkets, which can affect how quickly local weather views are absorbed into price.

The main catalyst is the actual temperature path at Schiphol through the afternoon and early evening, because the market resolves on the day’s *highest* reading, not the morning forecast. Late-day convection, wind direction, cloud cover and any fast-moving showers can all cap the peak, while a dry, sunny spell can lift it quickly; Amsterdam’s July average high is only about 22°C, so the tail risk sits in a relatively small band most days.[3][5][12] Traders should also watch whether platforms have already reflected the latest local forecasts, since the same weather outcome can be priced differently depending on whether a venue shows decimal odds, net-implied probability, or a price after commission and settlement frictions.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Amsterdam on July 30? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative UK has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative UK offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.