Highest temperature in Chongqing on August 3?

Platform comparison

Market context

Chongqing’s highest recorded temperature on 3 August will be measured at Jiangbei International Airport, and the market resolves to the temperature band containing that day’s peak observation. August is normally the city’s hottest month, with typical highs around 33–34°C, while some guides describe Chongqing’s summer as able to push well into the high 30s on the hottest days.[1][5][8][15]

That context matters because the current crowd-implied **0% YES** price on Polymarket is more a statement about positioning than about the weather itself. On the comparable temperature profile, the most relevant read-through is whether the day behaves like an ordinary August afternoon or one of the city’s sharper heat spikes; the all-time Chongqing record of 43°C shows the upper tail is real, even if it is not the norm.[3][5] For platform comparison, Polymarket typically shows prices as implied probability, while Kalshi and Betfair-style books are easier to read as contract or decimal prices, and fee treatment differs: Polymarket trading costs are embedded in market price and execution, whereas exchange-style books usually separate the quoted price from explicit fees or commissions.

For traders, the key catalysts are the local forecast around the airport station, the timing of afternoon heating, and any rain or cloud cover that caps the daytime maximum. August in Chongqing is also a humid, rainy month, so convective showers can materially reduce the day’s top temperature even when the morning starts hot.[1][8][15] On this market, the relevant dependency is not a citywide average but the single highest airport reading before the settlement window closes, so late-day weather at Jiangbei matters more than headline city forecasts. KYC and market access also differ by venue: Polymarket is crypto-native and tends to be broader in some regions, while Kalshi and Betfair-style access is more jurisdiction- and verification-dependent, which affects who can actually express a view on this kind of weather outcome.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Chongqing on August 3? 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

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.

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.

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.