Highest temperature in Tokyo on August 8?

Platform comparison

Market context

Tokyo’s heat on 8 August is normally driven by a strong summer high-pressure pattern, and recent guidance had already clustered the day’s high in the mid-30s Celsius. Polymarket’s contract was pricing a concentrated outcome set around 33–34°C, with 34°C shown as the leading bucket at 50% and 33°C at 34%, while AccuWeather’s Tokyo forecast pointed to about 94°F/34°C for the date and a 92°F/33°C 10-day view for the same day.[2][8][1]

That probability profile looks far less unusual when set against Tokyo’s August climatology: August is the city’s hottest month, with average highs around 31°C and frequent days above 33°C.[6][11] For comparison, the Japan Meteorological Agency’s Tokyo-area daily table already showed Haneda reaching 35.6°C on 1 August and 33.0°C on 2 August in 2026, illustrating how quickly a single clear, humid day can lift the realised peak well above the monthly mean.[5] On Polymarket, the crowd-implied probability is shown directly, whereas Kalshi, Betfair and Smarkets more often display prices in contract or decimal-odds form, so a 0% implied chance here may reflect an ask-driven market rather than a literal impossibility; fees and access also differ materially, with Polymarket largely crypto-native and geographically restricted, while Kalshi and Betfair/Smarkets use fiat rails and broader KYC-based access.[2]

The main catalysts are the day’s actual Tokyo weather, the timing of any late-morning to early-afternoon heating, and whether showers or cloud cover cap the peak before the settlement cut-off at 12:00 UTC. The contract text says the result follows Weather Underground’s “Daily Observations” table rather than the summary high/low, so a trader should watch the station-level Haneda feed, not just a headline forecast, because a revision in the observation table before the next day’s first datapoint can still change settlement.[2] Recent reporting on Japan’s exceptional heat, including record national temperatures earlier in the week, underlines that inland and metropolitan Japan can still overshoot forecasts when synoptic heat builds rapidly.[17]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Tokyo on August 8? 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

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.

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 supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi 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.