Highest temperature in Chengdu on July 31?

Platform comparison

Market context

Chengdu’s afternoon high on 31 July is likely to be read against a very warm July climatology rather than a cool-season baseline. Long-run July averages put Chengdu’s daytime maximum around 30–31°C, with typical highs near 30.5°C to 31°C and occasional peaks into the mid-30s Celsius, while one July reference gives a historical high of 35.7°C on the 31st itself. That makes the current 0% YES pricing easy to understand only if the market is sitting on an unusually narrow temperature band; in weather markets, single-digit odds often reflect either a lack of fresh forecast detail or a consensus that the eventual airport reading will land in an expected range rather than near an upper tail outcome.[2][4][11][15]

For platform comparison, the key difference is presentation and frictions rather than the underlying meteorology. Polymarket and Kalshi typically show outcomes as implied probabilities, whereas Betfair and Smarkets usually express the same view through decimal odds and charge different trading or commission structures, so the same expectation can look materially different after fees. On this specific Chengdu temperature market, that matters because the settlement source is a single airport station reading from Wunderground, so traders will care more about how each venue prices a narrow Celsius interval than about any broader citywide forecast; access and KYC can also diverge, with some books limiting participation by jurisdiction more tightly than others.

The main catalysts are the final airport forecast updates, cloud cover and rainfall timing, and whether the local monsoon pattern suppresses the daytime maximum below the recent July norm. At 11:00 UTC, the relevant question is still the late-afternoon heat in Chengdu local time, so any shift in convective rain or sunshine hours could move the highest reading by a degree or two. Recent weather guidance for Chengdu has pointed to hot, humid conditions with highs around 33–35°C on some July days, which keeps the upper temperature bands live even if the market’s current crowd view is sceptical.[2][10][16]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Chengdu on July 31? 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

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

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.

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.