Highest temperature in Shanghai on August 17?

Platform comparison

Market context

Shanghai's highest temperature on 17 August 2026 will be measured at Pudong International Airport Station and recorded in Weather Underground's Daily Observations table, with settlement determined by that source rather than the Day High & Low summary. The current 0% implied probability reflects either extreme confidence in a specific temperature range or minimal trading activity on this particular date-location combination.

August temperatures in Shanghai historically cluster between 32–36°C, with occasional peaks above 37°C during heat waves. The 2013 summer saw Shanghai record 38.3°C; more recently, the city experienced sustained 35–36°C readings throughout mid-August 2023. Comparing across platforms reveals structural differences: Polymarket displays decimal odds alongside implied probability, whilst Kalshi and Betfair present odds in fractional or decimal formats that require manual conversion. Smarkets' commission structure (5% on winnings) differs from Polymarket's fee model, affecting effective payout calculations for temperature ranges spanning 1–2°C bands. KYC requirements vary significantly—Kalshi enforces stricter US-based verification than Polymarket's international accessibility, which influences liquidity depth on regional weather markets.

Traders should monitor the China Meteorological Administration's seasonal forecasts and any El Niño or La Niña developments announced between now and August 2026, as these influence East Asian summer patterns. Real-time tracking of Shanghai's July temperatures will provide calibration; sustained heat in the preceding month typically correlates with elevated August highs. Weather Underground's data collection methodology at Pudong remains consistent year-on-year, making historical comparisons reliable for positioning.

Methodology

This page compares Highest temperature in Shanghai on August 17? 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 Polymarket 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

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.

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. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Polymarket Alternative 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.