Highest temperature in Beijing on August 3?

Platform comparison

Market context

Beijing’s airfield reading for 3 August will hinge on whether the city gets a brief hot spell before cloud, showers or thunderstorms cap the day’s peak. Seasonal guides and monthly forecasts for early August generally put Beijing in the low- to mid-30s Celsius, with average highs around 30–31°C and a meaningful rain risk, while one forecast model has the day near 37°C and another local outlook has 33°C with thundery showers; that spread is why the market should be read as a narrow band around the low 30s rather than a one-way bet on extreme heat.[1][4][6][14]

For historical framing, early August in Beijing is usually hot but not uniformly scorching, and that matters because the market settles on the **highest** temperature recorded at Beijing Capital International Airport, not the daily average. One platform’s event page points to trader sentiment clustering around 33–35°C, which is consistent with small weather-system shifts having an outsised effect on the day’s maximum.[5] On Polymarket, that expectation is expressed as an implied probability; on Kalshi it would usually appear as a price in dollars per contract, while Betfair and Smarkets would show decimal odds after commission, so the same weather view can look very different once fees and market format are applied. Access also differs: KYC is generally broad on regulated venues such as Kalshi and exchange-style books, whereas Polymarket’s reach is shaped more by the user’s jurisdiction and platform rules.

The main catalysts are the short-range forecast updates, any thunderstorm timing, and the airport station’s actual observation window before the settlement cutoff at 12:00 UTC. A late-morning rain band can suppress the maximum even if the broader city forecast is hot, so traders usually watch hourly model runs and official city forecasts rather than monthly averages alone; Hong Kong’s government weather bulletin on 2 August, for example, still showed Beijing with thunderstorms and a 32°C maximum, underscoring how quickly the ceiling can shift in this pattern.[3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Beijing on August 3? 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.

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.

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.

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.