Highest temperature in Tokyo on August 14?

Platform comparison

Market context

Tokyo's peak temperature on 14 August 2026 will be recorded at Haneda Airport Station and measured against discrete temperature bands. The resolution hinges on Weather Underground's Daily Observations table rather than its Day High & Low summary—a methodological distinction that occasionally produces different readings when station equipment logs intraday spikes that don't align with official daily summaries. This specificity matters because different platforms handle weather data differently; Kalshi and Betfair typically reference national meteorological authority figures, whilst Polymarket's reliance on a third-party weather aggregator introduces a layer of data-source variance that traders on traditional books won't encounter.

Mid-August Tokyo temperatures historically cluster between 32–36°C, with extreme heat events pushing toward 38–40°C occurring roughly once per decade. The 0% crowd probability suggests either extreme confidence in a specific temperature band or thin liquidity across the full range. Comparable August days at Haneda show high variance depending on typhoon proximity and upper-atmosphere pressure patterns; 2023 saw 34.5°C on 14 August, whilst 2022 recorded 33.2°C. Traders should monitor Japan Meteorological Agency forecasts from mid-July onwards and track any tropical cyclone development in the Western Pacific, as storm systems can suppress peak temperatures by 3–5°C.

The settlement window closes at midday UTC on 14 August 2026, creating a compressed resolution window compared to Smarkets' typically extended settlement periods. Polymarket's fee structure (2% maker/taker) differs from Kalshi's flat-fee model, affecting edge calculations on narrow temperature bands where implied probabilities cluster tightly.

Methodology

This page compares Highest temperature in Tokyo on August 14? 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

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. Polymarket Alternative 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. 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.