Highest temperature in Shanghai on July 25?

Platform comparison

Market context

Shanghai's highest temperature on 25 July 2026 will be recorded at Pudong International Airport Station and resolved via Wunderground's historical weather database. July is peak summer in Shanghai, with typical daily highs ranging from 32–35°C, though heat waves can push readings above 37°C. The settlement window closes at midday UTC on the resolution date, meaning traders must account for the fact that the highest temperature may occur in the afternoon or evening, after the official market close.

Historical July data from Shanghai shows considerable year-to-year variation. The city experienced a maximum of 40.9°C in July 2022 and 39.9°C in July 2013, but more typical peaks sit in the 33–36°C band. The 0% crowd probability suggests either extreme confidence in a specific temperature range or thin liquidity on outlier brackets. Kalshi's binary structure and Polymarket's categorical bins handle this differently: Kalshi would require a YES/NO threshold (e.g., "above 35°C"), whilst Polymarket's range-based settlement allows traders to isolate narrow bands. Betfair's decimal odds format can obscure implied probabilities for weather markets compared to Smarkets' fractional display, affecting how traders price tail-risk scenarios.

Monitoring China Meteorological Administration forecasts in late July will be essential, particularly any heat wave alerts issued in the week prior. El Niño or La Niña patterns influence East Asian summer temperatures; the current phase should be tracked via NOAA updates. Traders should verify Wunderground's historical data accuracy against official Shanghai meteorological records, as discrepancies between sources have occasionally affected weather market settlements on other platforms.

Methodology

We read Highest temperature in Shanghai on July 25? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

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.

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 supports Klarna/SOFORT?

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