Highest temperature in Shanghai on August 15?

Platform comparison

Market context

On 15 August 2026, Shanghai will record a daily maximum temperature at Pudong International Airport Station. The market resolves to whichever temperature band contains the highest reading logged in Weather Underground's Daily Observations table—a specification that matters because summary sections sometimes diverge from granular hourly data. The 0% crowd probability suggests traders are either absent from this particular contract or treating August mid-summer Shanghai heat as too volatile to price confidently.

Shanghai's August climate is remarkably consistent: the city averages 32–33°C during mid-month, with extremes rarely exceeding 37°C or falling below 28°C across a thirty-year baseline. The 2013 heat wave peaked at 37.0°C on 6 August; more recently, August 2022 saw highs of 36.1°C. These historical bands provide a reference frame for evaluating which temperature ranges carry genuine uncertainty versus those priced as tail events. Polymarket and Kalshi may structure their range buckets differently—Polymarket typically uses tighter 1°C increments whilst Kalshi favours wider bands—which affects how traders should calibrate position sizing.

Traders monitoring this contract should track China Meteorological Administration seasonal forecasts released in July 2026, which will indicate whether La Niña or El Niño conditions are influencing East Asian summer patterns. Typhoon activity in the Western Pacific during early-to-mid August could suppress temperatures, whilst high-pressure systems would elevate them. Weather Underground's data feed reliability matters operationally; historical outages or station maintenance during settlement windows have occasionally delayed resolution on Asian weather markets across competing platforms.

Methodology

This page compares Highest temperature in Shanghai on August 15? 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.

UK Frequently Asked Questions

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 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.

Polymarket vs Betfair Exchange: which is better for UK prediction trading?

Betfair Exchange offers UKGC regulation, GBP settlement, and potentially tax-free winnings — but focuses on sports and politics only. Polymarket has deeper liquidity, 0% platform fee, global event coverage, and crypto/geopolitical markets Betfair doesn't offer. For UK traders: Betfair for regulated GBP sports markets; Polymarket for broader, global prediction events.

Is Kalshi available in the UK?

Kalshi is a US CFTC-regulated prediction exchange. UK residents can create accounts but must use USD and US payment methods. Kalshi's product range overlaps with Polymarket but with lower liquidity on most contracts. For UK traders, Polymarket typically offers better prices due to higher global volume.