Highest temperature in Chengdu on July 13?

Platform comparison

Market context

Chengdu is set to record its peak daily temperature on 13 July 2026 at the Shuangliu International Airport Station, with the market betting on whether the heat will breach specific Celsius thresholds. Current early-July data shows frequent readings of 34–36°C under similar conditions, while historical July climatology typically centres on 30–32°C[1]. Although the crowd-implied probability for a “YES” outcome sits at 0%, the frontrunner outcome is 38°C at 34%, with 37°C trailing at 28%[1]. This divergence highlights how Polymarket’s implied probability format contrasts with Kalshi or Betfair, which often display decimal odds; the 0% figure suggests a near-zero chance of a specific binary trigger, whereas the range market on Polymarket assigns significant weight to the 38°C outcome.

Traders should monitor real-time updates from Wunderground, the designated resolution source, as July is one of Chengdu’s hottest and most fuggy months, with temperatures occasionally reaching 38°C[2]. Recent record-breaking heatwaves across China, including a national record for July 2023, suggest that extreme temperatures are plausible despite the current low probability[5]. The settlement window ends at 12:00 UTC on 13 July, meaning traders must watch for afternoon thunderstorms or cloud cover that could suppress peak temperatures, as rain typically arrives as short evening showers[2].

Platform mechanics further shape the trade: Polymarket’s fee structure and lack of KYC requirements differ markedly from Smarkets’ commission model or Kalshi’s strict identity verification. While Polymarket uses implied probability to express odds, books like Betfair display decimal odds, altering how traders calculate expected value. The 0% YES probability on this binary slice may reflect a specific threshold not met by the range market’s leading 38°C outcome, illustrating how resolution definitions and platform framing create distinct trading landscapes across competitors.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Chengdu on July 13? 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

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.

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.

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. Robinhood Prediction Markets 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.