Highest temperature in Shenzhen on August 10?

Platform comparison

Market context

Shenzhen’s heat on 10 August is what will decide this market, with the settlement source tied to Weather Underground’s **Daily Observations** for Shenzhen Bao’an International Airport rather than the site’s summary high. That matters because the current market is about the *single highest recorded temperature in Celsius* during the day, not a subjective weather impression, and early readings already point to a hot afternoon: Weather Underground showed **94°F** by 11:00 AM, while Timeanddate’s historic feed had **91°F at 10:00 AM** and **97°F by 2:00 PM**, indicating that the eventual settlement band will likely depend on whether the afternoon plateau edges a degree or two higher.[5][1]

On comparable summer days, Shenzhen often finishes in the low-to-mid 30s Celsius, so a very low crowd price can reflect both the late settlement window and the fact that one precise observation can move the outcome. Weather history and August averages from third-party archives cluster around highs near **32–33°C** (roughly **89–91°F**), while current live forecast pages from AccuWeather and Timeanddate are both centred on a daytime high of about **97°F**; that makes sub-90°F outcome bands difficult to justify unless cloud, rain, or a sea-breeze cap the temperature earlier than expected.[3][7][10][13][17]

For traders comparing platforms, Polymarket typically presents this as an implied probability, while Kalshi and Betfair-style books are more naturally read through contract price or decimal odds, so a **0% YES** print can be a formatting artefact rather than a literal zero chance. The practical differences are in costs and access: Polymarket is usually the more crypto-native venue, Kalshi is the most US-regulated of the three, and Smarkets/Betfair-style markets often add commission or exchange fees that matter on a narrowly scoped weather contract where the key edge is in execution rather than wide price dispersion.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Shenzhen on August 10? 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

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.

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.