Highest temperature in Tokyo on July 10?

Platform comparison

Market context

The real-world event at hand is the highest temperature recorded on 10 July 2026 at Tokyo Haneda Airport Station, measured in degrees Celsius and sourced from Wunderground. Historical July data for Haneda shows daily highs typically ranging between 28°C and 32°C, with the average maximum for the month sitting near 28°C [4]. Recent forecasts for the coming week in Tokyo Haneda indicate temperatures holding steady around 30°C, aligning with the narrow 29–31°C envelope currently implied by Polymarket traders, where 31°C carries a 38% probability and 30°C follows at 34% [1]. This clustering contrasts sharply with Kalshi’s implied probability model, which often expresses outcomes as decimal odds, and Betfair’s fee structure, which can vary by liquidity tier, whereas Polymarket’s flat fee and no-KYC access attract a different trader demographic focused on granular weather outcomes.

Traders should monitor the Japan Meteorological Agency’s three-day forecast updates, which currently show cloudy conditions with a 20% precipitation probability for the 12–18 UTC window [7]. While late July in Japan can see extremes reaching 37–38°C, early July remains moderated by the lingering rainy season, particularly in coastal zones like Haneda [6]. Smarkets’ decimal odds format may offer clearer value comparisons for this market than Polymarket’s probability-based interface, especially for traders weighing low-probability spikes. No major weather announcements are scheduled, but the dependency on Wunderground’s real-time data means any gaps in reporting could delay resolution, a risk less pronounced on Kalshi where official government sources often anchor settlements. The 0% current crowd-implied probability for the “YES” outcome likely reflects a misunderstanding of the market’s binary framing, as the actual resolution hinges on temperature ranges, not a simple yes/no condition.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Tokyo on July 10? 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

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.

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.

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. 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.