Highest temperature in Tokyo on August 14?

Platform comparison

Market context

Tokyo's highest temperature on 14 August 2026 will be recorded at Haneda Airport Station and measured against preset Celsius ranges. The settlement hinges on Weather Underground's Daily Observations table rather than the Day High & Low summary—a distinction that matters when automated feeds diverge from manual station records. This specificity reflects how different prediction platforms handle meteorological data: Kalshi typically enforces granular source hierarchies to reduce settlement disputes, whilst Betfair and Smarkets often accept broader weather service summaries. Polymarket's resolution criteria tend toward simpler benchmarks, potentially creating arbitrage opportunities if this market migrates across venues.

Mid-August Tokyo temperatures historically cluster between 32–36°C, with 2023 recording 35.1°C on 14 August and 2022 reaching 34.8°C. The Japan Meteorological Agency's seasonal forecasts, published in June and July, will signal whether 2026 tracks toward an anomalously hot or temperate August. El Niño or La Niña conditions active in early 2026 could shift baseline expectations significantly. Traders should monitor JMA advisories and any heat-wave warnings issued in late July, as these typically precede sustained high-temperature periods. The current 0% implied probability suggests either extreme confidence in a cooler outcome or insufficient market liquidity; comparable August markets on Kalshi and Smarkets have historically shown wider probability distributions once trading volumes increase.

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

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

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.