Highest temperature in Tokyo on July 17?

Platform comparison

Market context

Tokyo’s highest temperature on 17 July 2026 will be recorded at the Tokyo Haneda Airport Station, with the outcome resolved via Wunderground’s daily history for that location. The market currently shows a 0% implied probability for the YES outcome, suggesting the crowd believes the temperature will fall outside the specified range, though the exact range is not defined in the prompt. This zero probability is unusual for a weather event in mid-July, when Tokyo typically experiences highs between 25°C and 32°C.

Historical data from recent years shows Tokyo’s July highs consistently exceed 25°C, with 2023 reaching 35.2°C and 2024 hitting 34.8°C at nearby stations [1]. The 0% YES probability may reflect a mismatch between the market’s range and typical conditions, or a technical quirk in how the platform calculates odds. On Polymarket, outcomes are shown as decimal odds or percentages, while Kalshi uses implied probability directly; fee structures also differ, with Polymarket charging 1–2% per trade versus Kalshi’s 0–1% and Betfair’s commission-based model. KYC requirements vary too: Polymarket allows some anonymous trading, whereas Kalshi and Betfair enforce strict identity verification.

Traders should monitor the Japan Meteorological Agency’s weekly forecast and any heatwave advisories issued for the Kanto region, as these directly influence temperature outcomes. A recent forecast from the agency indicates stable high-pressure conditions over Tokyo through mid-July, which typically elevate temperatures [1]. Watch for updates on the Wunderground resolution page as the settlement window closes at 12:00 UTC on 17 July 2026, since discrepancies between platforms’ odds may arise from differing data interpretations or fee impacts on liquidity.

Sources: 1

Methodology

This page compares Highest temperature in Tokyo on July 17? 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, 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.

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 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.