Highest temperature in Tokyo on August 19?

Platform comparison

Market context

Tokyo's highest temperature on 19 August 2026 will be recorded at Haneda Airport Station and measured against discrete temperature bands. The market resolves using Weather Underground's Daily Observations table rather than the summary Day High & Low section, a distinction that matters when automated systems report slightly different peaks depending on observation frequency and timing. Settlement occurs at 12:00 UTC on the day itself, leaving a narrow window for final data confirmation.

August in Tokyo typically peaks between 32–35°C, with extreme heat events pushing toward 37–38°C. The 0% crowd probability suggests traders are either absent from this market or treating it as a placeholder pending fuller liquidity. Historical August records at Haneda show consistent clustering in the 33–35°C range, though the 2023 heatwave saw temperatures exceed 37°C across multiple days in the region. Comparable markets on alternative platforms—Kalshi's weather contracts favour US locations with denser trader participation, whilst Betfair's Japanese weather offerings remain thinner—reveal how geographic focus shapes both odds depth and settlement certainty.

The Japan Meteorological Agency publishes seasonal forecasts and monthly outlooks; their mid-summer 2026 guidance will influence trader positioning as August approaches. El Niño or La Niña conditions active in early 2026 could shift baseline expectations upward or downward. Traders should monitor Wunderground's historical data quality for Haneda specifically, as station maintenance or sensor changes occasionally create discontinuities that affect settlement interpretation. Fee structures across platforms (Polymarket's 2% taker fee versus Kalshi's variable model) become material only once volume materialises in this thin market.

Methodology

This page compares Highest temperature in Tokyo on August 19? 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 Kalshi Alternative UK, 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.

UK Frequently Asked Questions

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.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative UK has a different geo footprint and routes to Polymarket's order book at 0% fees.

Polymarket vs Betfair Exchange: which is better for UK prediction trading?

Betfair Exchange offers UKGC regulation, GBP settlement, and potentially tax-free winnings — but focuses on sports and politics only. Polymarket has deeper liquidity, 0% platform fee, global event coverage, and crypto/geopolitical markets Betfair doesn't offer. For UK traders: Betfair for regulated GBP sports markets; Polymarket for broader, global prediction events.

Is Kalshi available in the UK?

Kalshi is a US CFTC-regulated prediction exchange. UK residents can create accounts but must use USD and US payment methods. Kalshi's product range overlaps with Polymarket but with lower liquidity on most contracts. For UK traders, Polymarket typically offers better prices due to higher global volume.