Highest temperature in Tokyo on August 6?

Platform comparison

Market context

Tokyo’s official high for 6 August will be measured at Haneda, and the market settles against the single highest reading recorded there during the day, not the broader city average. That distinction matters because the benchmark station is coastal and can print differently from central Tokyo, so the relevant range is usually read through the lens of the airport observation, not the headline city forecast.[1][6]

The crowd’s 0% yes on Polymarket is hard to square with the surrounding weather context: forecast sources for Tokyo on 6 August point to a daytime peak around 32°C to 33°C, with nearby published August climatology clustering near 31°C for Tokyo and the low-to-mid 30s appearing regularly in early August.[2][3][9][10] On that basis, a bucketed market around the low 30s is more plausible than an extreme print, and the divergence from 0% looks more like an early-price artefact than a strong weather signal. Polymarket shows outcome prices in cents, so a 24¢ share implies a 24% probability, whereas Kalshi and Smarkets typically express the same idea as decimal or percentage-style pricing, which can make the same weather read look less stark across books.[5]

For traders comparing venues, the main catalysts are the morning and afternoon temperature updates, plus any shift in the forecast path as the day develops; once the sun is up, Tokyo temperatures can move quickly in August, and recent coverage has highlighted persistent heat risk across Japan this summer.[15][16] The practical difference is operational: Polymarket is price-driven and open globally in many cases, while regulated books such as Kalshi, Betfair and Smarkets differ on KYC reach, access rules and fees, so the same temperature view may trade at different all-in costs even when the headline probability is similar.[5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Tokyo on August 6? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

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

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. Polymarket Alternative 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. Polymarket 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.