TOTAL VOLUME:
$134.1b
24H VOL:
$141,541,542
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,440,096,988
406,065
Markets across
30,522
events
MATCHED EVENTS:
2,692
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Jun 26, 8:00 AM EST
Polymarket
These markets ask what the highest temperature will be in Atlanta on June 26, 2026, with resolution based on official weather data. Kalshi references June 25, 2026 (apparent date error), while Polymarket correctly specifies June 26, 2026 and uses Wunderground historical data from Hartsfield-Jackson International Airport Station.
This market will resolve to the temperature range that contains the highest temperature recorded at the Hartsfield-Jackson International Airport Station in degrees Fahrenheit on 26 Jun '26. The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Hartsfield-Jackson International Airport Station, available here: https://www.wunderground.com/history/daily/us/ga/atlanta/KATL. To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C. This market can not resolve until the first data point for the following date has been published on the resolution source. The resolution source for this market measures temperatures to whole degrees Fahrenheit (eg, 21°F). Thus, this is the level of precision that will be used when resolving the market. Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
Resolution is based on the maximum temperature recorded at Atlanta, GA on June 25, 2026, as reported in the National Weather Service's Climatological Report (Daily). The temperature is divided into six distinct ranges: 85°F or below, 86-87°F, 88-89°F, 90-91°F, 92-93°F, and 94°F or above. Each range corresponds to a specific market outcome. The official data source is accessed through the NWS website at the Peachtree City office, selecting the Observed Weather tab and Atlanta location with Daily Climate Report. Traders should note that preliminary NWS data may be subject to rounding and conversion nuances, and the final official report should be used for resolution rather than preliminary readings or third-party weather services.
Polymarket and Kalshi can show different implied probabilities for the same outcome because of liquidity, fee structure, participant mix, and how each venue defines the contract. Each platform attracts different trader demographics, liquidity pools, and fee structures, which can push prices apart even when tracking the same underlying event. Kalshi's regulatory framework and contract design may appeal to risk-averse participants, while Polymarket's interface and user base can skew toward different temperature thresholds or confidence levels. Arbitrage opportunities between the two platforms incentivize traders to exploit spreads, but friction costs and withdrawal delays can prevent full convergence. Monitoring both venues reveals whether consensus is tightening or if material disagreement persists on Atlanta's June 26 high.
Updated weather models, tropical system forecasts, and atmospheric pressure patterns will drive price swings as June 26 approaches. Major model consensus shifts—such as a cold front arriving earlier or a heat dome intensifying—can trigger sharp repricing. Real-time satellite and radar data released by the National Weather Service typically tightens odds in the final 48 hours. Urban heat island effects, cloud cover, and overnight lows also influence daytime highs. Breaking news of unusual weather patterns or sudden model disagreement can create volatility, rewarding traders who monitor meteorological updates closely.