Highest temperature in Shanghai on August 5?

Platform comparison

Market context

Shanghai’s highest temperature today will be measured at Pudong International Airport, and the market resolves to the temperature band containing that day’s peak reading from Wunderground rather than a citywide average. That makes the key question not whether Shanghai stays hot — it usually does in early August — but whether the day’s top observation lands in the 33°C, 34°C or nearby bracket, which is why the current crowd price can sit at 0% YES even when the weather looks broadly warm.

Recent forecasts cluster around the low-to-mid 30s Celsius, with AccuWeather showing a 5 August high of about 90°F/32°C and other forecasters putting the day nearer 34–35°C, alongside humidity and a chance of showers or thunderstorms.[1][2][3][4][14] For a comparison across books, Polymarket presents this as a discrete temperature ladder with implied probabilities, while exchanges such as Betfair and Smarkets typically show decimal odds that can be converted back to implied probability, often with different fee treatment and access constraints. That matters here because a narrow outcome band and a late-afternoon weather swing can move a weather contract sharply even when the headline forecast barely changes.

The main catalysts are timing and local weather structure: cloud cover, rain bands, and thunderstorm timing can suppress the airport maximum if they arrive before the daily peak, while a brief sunny spell can lift the reading above the consensus range. Shanghai’s August climatology is hot and humid, with typical highs around 31–32°C and frequent rainfall, so traders should watch short-term model updates and any station-specific observation trend as the settlement window approaches.[4][5][10][17][18] Because the settlement source is an airport station, book-to-book differences also depend on whether the platform allows only localised climate data, what KYC it requires for access, and whether fees are embedded in spread pricing or charged separately.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Shanghai on August 5? 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.

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.

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.