Highest temperature in Shanghai on August 10?

Platform comparison

Market context

Shanghai’s highest temperature will be set by what the station at Shanghai Pudong International Airport records in Weather Underground’s **Daily Observations** table on 10 August, not by the site’s day-high summary. That matters because the market is effectively a banded outcome on the day’s peak Celsius reading, so the relevant question is whether the afternoon heat reaches one bracket higher or lower than traders expect. Weather Underground’s Shanghai history pages show that August highs in the city commonly sit in the low-to-mid 30s Celsius, with recent historical examples around 32–35°C and occasional hotter spikes above that range.[7][13]

The current 0% YES crowd price looks aggressive against the seasonal pattern, but platform mechanics can make “0%” mean different things. On Polymarket, the quoted price is an implied probability, while on Kalshi and Betfair-style books the same view may be expressed through contract prices or decimal odds after fees and spread; Smarkets also shows the market in a differently fee-adjusted format. For this specific weather market, the practical comparison is that high summer Shanghai temperatures are usually driven by local heat and humidity rather than a single institutional announcement, so the trader’s edge comes from reading the forecast distribution rather than headline commentary.[5][8][17]

The main catalysts are the short-range forecast, typhoon or rain-band shifts, and the timing of the Shanghai afternoon maximum, which often arrives after late morning heating rather than at dawn. Timeanddate’s forecast for Shanghai on 10 August points to a very wet day with a high around 83°F and heavy rain risk, while other forecast sources still place the day in a hot August pattern near the low 30s Celsius, so the range outcome depends on whether rainfall suppresses the peak before local afternoon warming.[12][13] For access, Polymarket is crypto-based and typically broader on geography, whereas Kalshi and Betfair/Smarkets are more tied to KYC and jurisdictional availability, which affects who can actually trade the same weather view.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Shanghai on August 10? 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, 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

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.

Which platform supports Klarna/SOFORT?

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