Highest temperature in Shanghai on August 1?

Platform comparison

Market context

Shanghai’s highest temperature on 1 August will depend on the daytime heat spike at Pudong airport, not the citywide average, and Shanghai is normally warm enough in early August for a mid-30s Celsius reading to be plausible. Climatology sources put Shanghai’s August highs around 32–35°C, with WeatherSpark showing typical daily highs in the mid-80s to low-90s Fahrenheit and occasional excursions towards the upper 30s Celsius[1][3][9]. More extreme August outcomes are possible: Shanghai’s historic August record is around 40–41°C, although those levels are exceptional rather than typical[4][5][7].

That backdrop helps explain why a 0% crowd-implied “YES” on a specific temperature range can still be read as a price signal rather than a forecast of impossibility. On Polymarket, the displayed probability is a direct implied chance, while Kalshi and Betfair usually surface prices in exchange-style formats — decimal odds or contract prices — so the same view can look different after fees and spreads. Smarkets similarly quotes exchange prices but charges commission on winnings, whereas access and KYC can also diverge: Polymarket’s reach is more restricted by jurisdiction, while regulated venues such as Kalshi and Smarkets have stricter identity checks and broader compliance framing.

For traders, the main catalysts are the actual Shanghai Pudong International Airport station observations during the daytime heating window and any weather-system shifts that suppress or amplify the afternoon peak. Early August in Shanghai is also in the core of the humid, typhoon-prone season, so cloud cover, heavy rain, or storm tracks can cap the day’s maximum even if the broader month is hot[8][14]. Recent local reporting has also highlighted Shanghai’s susceptibility to prolonged heat episodes in late summer, underlining how quickly the distribution can shift when a persistent ridge or hot, dry air mass settles over the city[2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Shanghai on August 1? 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 Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

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.

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.

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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets 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.