Highest temperature in Dallas on August 9?

Platform comparison

Market context

Dallas is likely to finish 9 August with a **high around the upper 90s to near 100°F**, based on the official daily climate report for the Dallas/Fort Worth area and the live conditions reported at Dallas Love Field earlier in the evening, which already showed **96°F** with a **99°F heat index**.[5][2] Polymarket’s current **0% YES** looks detached from those observed temperatures: on that venue, prices are shown as crowd-implied probabilities, so a 0% reading means traders are assigning no chance to the target band, even though the broader market elsewhere has converged on **98–99°F** for the same day.[1]

For context, Dallas in August often prints near or above **97°F** on the official climate normal, and recent comparable daily reports have shown maxima in the **high 90s to low 100s**, making a sub-94°F outcome an outlier rather than a base case.[5][4] That is why the same event can trade differently across venues: Polymarket shows implied probability directly, while Kalshi typically quotes decimal-style contract prices; Betfair and Smarkets instead take exchange commission from winnings, so the effective price a trader receives is net of fees. KYC also differs materially, with access and onboarding varying by jurisdiction and platform.

The main catalyst for settlement is not a forecast update but the **final Weather Underground Daily Observations entry** for Dallas Love Field on 9 August, because that table is the primary source if it differs from the day-high summary.[10] Traders should watch for any late revisions before the first datapoint for 10 August is published, since those can still affect resolution.[1] Any midday thunderstorms, cloud cover, or heat-index changes matter only insofar as they alter the recorded maximum, and after that cutoff the market becomes a data-verification exercise rather than a weather call.[2][10]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Dallas on August 9? 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 Robinhood Prediction Markets, 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.

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. Robinhood Prediction Markets 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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets 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.