Highest temperature in Shanghai on July 31?

Platform comparison

Market context

Shanghai’s highest temperature on 31 July will be taken from the Pudong International Airport station, so the key number is the day’s peak reading rather than the afternoon forecast at any single hour. In temperature markets like this, the current 0% implied YES price is only meaningful if the book’s settlement rules, data source, and geographic station match the trader’s model; here, Wunderground’s daily history page for the station is the resolution source, which puts the emphasis on the final observed maximum rather than citywide averages.[6]

History gives this date a warm baseline. Shanghai is typically near its seasonal peak in late July, with July average highs around the low 30s Celsius and a substantial summer humidity load, while recent reporting has shown the city capable of long extreme-heat spells and temperatures above 35C under a subtropical high-pressure setup.[4][2] More recent July weather datasets also show that end-of-month highs can still sit in the mid-30s Celsius, with one published Shanghai July 2026 series putting 31 July at a 34.2C high, though that is for the city generally rather than the exact Pudong airport station used here.[15]

For traders comparing Polymarket, Kalshi, Betfair, and Smarkets, the practical differences are in price display, access, and friction. Kalshi and Polymarket generally quote market-implied probabilities directly, while Betfair and Smarkets are exchange-style books where the same view is expressed as decimal odds and the effective price depends on commission or fees; that matters in a weather market where a low-probability tail can look different after costs. KYC and geo-access also diverge: Kalshi is US-focused, Betfair and Smarkets have broader but still regulated market access, and a location-specific weather contract tied to a Chinese airport station may be easier to view than to trade depending on where the platform accepts customers.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Shanghai on July 31? 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

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 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.

Which platform supports Klarna/SOFORT?

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