Heavy rainfall on September 9, 2026, concentrated in central Iowa, where a slow-moving frontal boundary triggered repeated thunderstorms and flash flooding along the I-80 corridor. Des Moines International Airport recorded 3.77 inches by midnight on the 8th alone—breaking the September daily record—while CoCoRaHS reports showed 4–6+ inches across Des Moines metro suburbs through the morning of the 9th. Official NWS climate summaries noted thunderstorms and light rain or trace amounts in parts of Florida and the central Midwest, including St. Petersburg and Topeka, but zero measurable precipitation in New York City and Washington, D.C. These observed patterns, verified by National Weather Service stations, determine market resolution based on location-specific thresholds rather than forecasts.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedWhere will it rain on September 9?
New York, NY
48%
Los Angeles, CA
49%
Chicago, IL
99%
Houston, TX
99%
Dallas, TX
4%
Phoenix, AZ
4%
Philadelphia, PA
18%
Denver, CO
4%
Washington, DC
4%
Atlanta, GA
21%
Miami, FL
99%
Seattle, WA
26%
Boston, MA
74%
New Orleans, LA
47%
San Francisco, CA
23%
$3,451 Vol.
New York, NY
48%
Los Angeles, CA
49%
Chicago, IL
99%
Houston, TX
99%
Dallas, TX
4%
Phoenix, AZ
4%
Philadelphia, PA
18%
Denver, CO
4%
Washington, DC
4%
Atlanta, GA
21%
Miami, FL
99%
Seattle, WA
26%
Boston, MA
74%
New Orleans, LA
47%
San Francisco, CA
23%
Measurable precipitation means 0.01 inches or more as reported by the PRECIPITATION (IN) figure in the NWS Daily Climate Report (CLI) for the city's station.
A report of trace ("T") does not qualify.
The PRECIPITATION (IN) figure measures total liquid-equivalent precipitation and does not distinguish between precipitation types.
The observation period is the NWS climate day for KIAH: midnight to midnight local standard time. The final CLI report for a climate day is issued the following morning.
This market will resolve according to the NWS Daily Climate Report as published by 2:00 PM ET on the day following the observation date. If multiple versions of the report are issued, the last version published before that time governs. If no figure has been published by that time, this market will resolve to "No".
The resolution source for this market is the NWS Daily Climate Report (CLI) for KIAH, published at https://forecast.weather.gov/product.php?site=NWS&product=CLI&issuedby=IAH.
Market Opened: Sep 8, 2026, 7:09 AM ET
Resolver
0x65070BE91...Measurable precipitation means 0.01 inches or more as reported by the PRECIPITATION (IN) figure in the NWS Daily Climate Report (CLI) for the city's station.
A report of trace ("T") does not qualify.
The PRECIPITATION (IN) figure measures total liquid-equivalent precipitation and does not distinguish between precipitation types.
The observation period is the NWS climate day for KIAH: midnight to midnight local standard time. The final CLI report for a climate day is issued the following morning.
This market will resolve according to the NWS Daily Climate Report as published by 2:00 PM ET on the day following the observation date. If multiple versions of the report are issued, the last version published before that time governs. If no figure has been published by that time, this market will resolve to "No".
The resolution source for this market is the NWS Daily Climate Report (CLI) for KIAH, published at https://forecast.weather.gov/product.php?site=NWS&product=CLI&issuedby=IAH.
Resolver
0x65070BE91...Heavy rainfall on September 9, 2026, concentrated in central Iowa, where a slow-moving frontal boundary triggered repeated thunderstorms and flash flooding along the I-80 corridor. Des Moines International Airport recorded 3.77 inches by midnight on the 8th alone—breaking the September daily record—while CoCoRaHS reports showed 4–6+ inches across Des Moines metro suburbs through the morning of the 9th. Official NWS climate summaries noted thunderstorms and light rain or trace amounts in parts of Florida and the central Midwest, including St. Petersburg and Topeka, but zero measurable precipitation in New York City and Washington, D.C. These observed patterns, verified by National Weather Service stations, determine market resolution based on location-specific thresholds rather than forecasts.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated


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