Highest temperature in Chongqing on August 4?

Platform comparison

Market context

Chongqing’s daytime heat is the core driver here: August is the city’s hottest month, with typical highs around 34°C and some guides putting extreme August temperatures in the high 30s to low 40s Celsius.[1][6][9] The market settles on the highest temperature recorded at Chongqing Jiangbei International Airport Station on 4 August, so the key question is not the daily mean but whether the station prints a brief spike above the usual August ceiling before midday UTC.[1][13]

For comparable context, recent August climate references point to a fairly narrow band in ordinary years, even though individual days can run hotter or cooler. Travel China Guide’s historical table shows 4 August at 34.6°C as a representative high, while broader monthly climate summaries cluster Chongqing’s August average high near 93°F/34°C and the month’s average low near 77°F/25°C.[1][9] Against that backdrop, a crowd-implied 0% YES looks more like a platform pricing artefact than a statement that the event cannot happen; on Polymarket the displayed price is an implied probability, while on Kalshi, Betfair or Smarkets traders usually read a quoted price or decimal odds after fees, so the same weather outlook can look very different once commission, spread and access rules are applied.

The main catalysts are the local forecast, the timing of any heat spike, and whether rain or cloud cover suppresses the afternoon maximum. Current weather pages already point to a hot, unsettled August pattern, with some forecasts showing highs in the mid-to-upper 30s and notes of possible rain, which matters because convective showers can trim the station maximum even in a very warm spell.[10][11][17] Trading interest also depends on the source mechanics: Wunderground’s station-specific history is the settlement reference, so updates in airport observations matter more than city-wide headlines, and access frictions differ across books because Polymarket, Kalshi, Betfair and Smarkets vary in KYC reach, user base and fee structure.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Chongqing on August 4? 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

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.

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.

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.