Highest temperature in Chengdu on August 9?

Platform comparison

Market context

Chengdu’s daytime heat is the key variable here: forecast services for 9 August point to highs around 32–34°C, with humidity and variable cloud cover but little sign of a cold spell or an early-morning peak that would break the daily maximum materially higher or lower.[2][3][10][13] For a settlement based on the Weather Underground *Daily Observations* table at Chengdu Shuangliu International Airport, the practical question is whether the recorded maximum lands in the 32°C, 33°C, or 34°C bucket rather than the broader “headline” values some sites display in summaries.[11]

The current crowd price of 0% YES on this market is unusual against the surrounding climate evidence, because August is typically one of Chengdu’s hottest periods, with average highs clustered around 30–32°C and occasional spikes into the high 30s.[4][12][14][16][20] On Polymarket, price is shown as an implied probability, so a 0% quote suggests either a stale book or a market that has not yet attracted much liquidity; on Kalshi and Smarkets, the same view would usually be expressed through decimal-style contract pricing, while Betfair adds a commission layer that can widen the gap between mid-price and realised value. Access also differs: KYC is generally more frictionless on offshore crypto venues, whereas regulated books typically require tighter identity checks and jurisdiction limits.

For traders, the main catalyst is the afternoon temperature profile at the airport station, not any citywide forecast headline, since the market resolves to the highest reading in the day’s observation table.[11] The relevant watchpoints are the timing of maximum heat, any late-day convection that caps the peak, and whether the Weather Underground record for Chengdu Shuangliu International Airport is revised before the next day’s first datapoint appears; Polymarket explicitly allows revisions within the settlement window until that cutoff.[11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Chengdu on August 9? 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.

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.