Highest temperature in Tokyo on August 14?

Platform comparison

Market context

Tokyo's highest temperature on 14 August 2026 will be measured at Haneda Airport Station and recorded in Weather Underground's Daily Observations table, with resolution determined by that source rather than the Day High & Low summary section. The market currently shows 0% implied probability, suggesting traders expect the settlement window to close before the actual event date or reflect extreme confidence in a specific temperature band.

Historical August temperatures at Haneda provide the baseline for calibration. Tokyo's August average high sits around 32–33°C, though heat waves regularly push readings into the 35–37°C range. The Japan Meteorological Agency reported that August 2023 saw multiple days exceeding 35°C across the Kanto region, with Haneda recording a peak of 36.4°C on 16 August that year. Comparable summers suggest the market's current odds may reflect either early-season positioning or uncertainty about which specific temperature bracket will resolve the contract, rather than doubt that a measurable high will occur.

Traders monitoring this contract should track the Japan Meteorological Agency's seasonal forecasts and any El Niño or La Niña patterns affecting the Western Pacific by mid-2026. Haneda's urban heat island effect and proximity to Tokyo Bay create localised conditions that can diverge from broader metropolitan readings. Cross-platform comparison shows Polymarket typically offers tighter spreads on weather contracts than Kalshi, though both require US-based KYC; Betfair and Smarkets accept international users but may carry wider bid-ask gaps on niche weather markets. The 0% current probability warrants verification against competing books before entry, as such extremes often signal data lag or settlement ambiguity rather than genuine market consensus.

Methodology

We read Highest temperature in Tokyo on August 14? 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

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.

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.

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.