Highest temperature in Beijing on August 3?

Platform comparison

Market context

Beijing’s airport high on 3 August is usually decided by whether the city gets a dry, sunny break or an afternoon thunderstorm over the Capital International Airport station. Recent August guidance puts Beijing’s daily highs broadly in the low-30s °C, with one market-facing forecast pointing to about 33°C and a thundery shower risk, while travel-oriented climatology still flags that highs above 35°C can occur early in the month when cloud cover is limited.[5][6][8]

For a 0% crowd-implied price, the comparison across books is more informative than the headline number. On Polymarket, the market is framed as a binary event and the quote is read as implied probability, whereas Kalshi-style contracts are usually easier to compare in decimal terms because the price maps more directly to the payout after fees; Betfair and Smarkets typically add commission on winnings, so the effective entry price can differ even when the market quote looks similar. That matters here because a one- or two-degree swing around the threshold can move the contract between adjacent temperature bands on settlement day, especially if convection or rain arrives early.[5][15]

The main catalysts are the official Beijing forecast updates, thunderstorm timing, and any shift in morning cloud or wind that changes the day’s peak before 12:00 UTC. Wunderground resolves off the highest temperature at Beijing Capital International Airport Station, so traders should watch airport-specific observations rather than downtown readings; local forecasts for 3 August also show Beijing around 32°C with thunderstorms, which is enough to keep the realised high sensitive to timing.[2][5] In practice, KYC reach and fees matter too: Polymarket access is more geography-dependent, while Kalshi, Betfair and Smarkets differ on availability and commission, which can affect whether a thin weather market is worth entering at all.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Beijing on August 3? 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

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.

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.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

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.