Lowest temperature in Shanghai on July 19?

Platform comparison

Market context

Shanghai's lowest temperature on 19 July 2026 will be recorded at Pudong International Airport Station and resolved via Wunderground historical data. July is peak summer in Shanghai, with typical daily lows around 24–26°C, though the absolute minimum can dip lower depending on overnight conditions and any passing weather systems. The settlement window closes at midday UTC on the resolution date, meaning traders must account for the full overnight period beforehand.

Historical July temperature records for Shanghai show considerable variation year-to-year. The city's climate data reveals that whilst most July nights stay above 22°C, cooler outliers do occur—particularly when monsoon troughs or tropical systems bring moisture and cloud cover that suppresses overnight heating. The 0% crowd probability suggests traders are pricing this as an extremely unlikely outcome, which typically reflects either very tight temperature bands in the market's range structure or genuine confidence that Shanghai's summer heat will prevent exceptionally low readings. Comparing platforms: Polymarket displays decimal odds directly, whilst Kalshi uses implied probability percentages; Betfair's exchange format allows lay positions that Smarkets' fixed-odds book does not, affecting how traders hedge tail-risk scenarios like unseasonable cooling.

Traders should monitor the China Meteorological Administration's 10-day forecasts released in early July, which will clarify whether any upper-level troughs or typhoon remnants might approach the region. Overnight cloud cover and humidity patterns in the days preceding 19 July are the primary drivers of minimum temperature variance. Kalshi's KYC requirements differ from Polymarket's, potentially affecting which user base has positioned itself on this specific outcome.

Methodology

This page compares Lowest temperature in Shanghai on July 19? 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

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.

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 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.