Highest temperature in Amsterdam on July 31?

Platform comparison

Market context

Amsterdam’s highest temperature on 31 July will be set by the day’s peak reading at Schiphol, so the market is really a bet on the afternoon warm-up rather than the overnight low. For late July, Amsterdam normally sits around the low 20s °C, with July averages near 22°C for daytime highs and about 13°C for lows, which makes a materially hot outcome possible but not routine.[6][8][13]

That context helps explain why a 0% crowd-implied YES can still be too rigid if traders expect a brief heat spike. Amsterdam’s July record data show that extremes can reach the low 30s °C, with one source citing a July record high of 32°C, while recent July histories have produced much lower peaks as well.[10][11] For this contract, Polymarket-style pricing is usually read as implied probability, whereas Kalshi and Smarkets show contract prices or decimal-style quotes that need translating into probability; Betfair’s exchange model adds a commission layer, so identical views can look different after fees. Access also differs: Kalshi is US-focused with tighter KYC and jurisdiction limits, while Betfair and Smarkets are broader exchange-style venues, and that affects who can actually participate in a weather line like this.

The key catalysts are the real-time temperature trend at Schiphol, cloud cover, wind direction, and any Netherlands or North Sea weather systems that either suppress afternoon heating or allow a short-lived spike. The market settles off Wunderground’s daily history for Amsterdam Airport Schiphol, so intraday updates matter only insofar as they foreshadow the final recorded high by the settlement window’s close.[15] At 15:00 UTC on 31 July, traders will already be looking at whether the day has enough runway left for the maximum to move into the next bracket.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Amsterdam on July 31? 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, 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

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

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 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.