Highest temperature in Chengdu on August 11?

Platform comparison

Market context

On 11 August 2026, the highest temperature recorded at Chengdu Shuangliu International Airport will determine this market's resolution. The settlement mechanism specifies the Daily Observations table from Weather Underground as the authoritative source, bypassing the Day High & Low summary section—a distinction that matters when comparing how different platforms handle weather data disputes. Chengdu's August climate typically peaks between 32–35°C, though extreme heat events have pushed readings above 40°C in recent years. The 0% crowd probability suggests traders currently assess the specific temperature threshold in question as unlikely, though this reflects market positioning rather than meteorological impossibility.

Chengdu experiences monsoon-influenced summers with variable intensity. The China Meteorological Administration reported that August 2023 saw regional temperatures exceed historical norms by 2–3°C across Sichuan Province, establishing recent precedent for elevated readings. Traders should monitor late July 2026 weather patterns and any official heat warnings issued by Chinese meteorological authorities, as these often precede August extremes. The resolution source—Wundergro's Weather Underground data—requires verification that the Shuangliu station maintains consistent reporting standards through the settlement window.

Across prediction platforms, this market illustrates divergent approaches to weather resolution. Polymarket and Kalshi both require explicit data source designation, though Kalshi's KYC requirements and US-focused liquidity may limit participation compared to Betfair's international reach. Decimal odds conversion varies by platform; a 0% implied probability translates to odds exceeding 1000.0 on traditional bookmakers, creating arbitrage opportunities if market sentiment shifts. Fee structures—typically 2% on Polymarket versus Kalshi's variable settlement fees—affect break-even thresholds for edge-based traders.

Methodology

We read Highest temperature in Chengdu on August 11? 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.

UK Frequently Asked Questions

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.

Polymarket vs Betfair Exchange: which is better for UK prediction trading?

Betfair Exchange offers UKGC regulation, GBP settlement, and potentially tax-free winnings — but focuses on sports and politics only. Polymarket has deeper liquidity, 0% platform fee, global event coverage, and crypto/geopolitical markets Betfair doesn't offer. For UK traders: Betfair for regulated GBP sports markets; Polymarket for broader, global prediction events.

Is Kalshi available in the UK?

Kalshi is a US CFTC-regulated prediction exchange. UK residents can create accounts but must use USD and US payment methods. Kalshi's product range overlaps with Polymarket but with lower liquidity on most contracts. For UK traders, Polymarket typically offers better prices due to higher global volume.