Highest temperature in Chengdu on August 9?

Platform comparison

Market context

Chengdu’s highest temperature on 9 August will be set by the station reading at Chengdu Shuangliu International Airport, not by any headline “day high” summary, so traders need to focus on the intraday sequence rather than a single forecast figure. Wunderground’s current history page for Chengdu shows the station already sitting at 79°F with a 79°F high logged at 9:00 AM UTC, while market settlement will depend on the *final* peak recorded before the window closes at 12:00 UTC.[6]

Seasonally, Chengdu usually sits near 30°C at this point in August, with record highs on 9 August running well into the high 30s on historical datasets and a long-run average around 30°C.[2][16] That makes the current 0% YES pricing look like a blunt reflection of a low maximum band rather than a claim that the city cannot heat up; in practice, the relevant comparison is whether the eventual airport observation lands in the market’s listed temperature range. The market format also matters: Polymarket shows probability directly, while Kalshi and Betfair typically present price or odds in a way that is less immediately comparable, and fees plus access rules can differ materially by venue. KYC coverage is also uneven, with some books open to broader retail access than others, so a trader’s ability to hedge the same weather view may vary by platform.

The main catalysts are the daytime forecast revisions, cloud cover, and any rainfall that suppresses the afternoon high. Current third-party forecasts cluster around the low 30s Celsius for Chengdu on 9 August, which is consistent with a warm but not extreme outcome.[2][14][20] For this market, the critical observation is the airport station series itself, because the settlement source prioritises the Daily Observations table over the summary high/low display; any late update before noon UTC can still matter if the day’s peak has not yet been fixed.[4][6]

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 Robinhood Prediction Markets, 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

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.

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.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.