Heavy rainfall on September 9, 2026, was concentrated in central Iowa, where a slow-moving frontal boundary triggered repeated thunderstorms and produced 3–6 inches of precipitation across the Des Moines metro and I-80 corridor, with some locations exceeding 5 inches according to NWS and CoCoRaHS reports. Official climatological summaries from stations such as Des Moines recorded daily totals well above normal, accompanied by flash flood warnings, while trace amounts fell in parts of Florida and Kansas amid isolated thunderstorms. In contrast, New York’s Central Park and several western sites measured zero precipitation under clearer conditions. Market-implied odds reflect these verified NWS/NOAA station measurements and regional radar totals, with traders weighting Midwest outcomes most heavily given the scale of observed accumulation and the resolution criteria tied to official daily reports. Updated model verification and final station data releases over the next 24–48 hours will confirm exact geographic boundaries for resolution.
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
24%
Chicago, IL
100%
Houston, TX
99%
Dallas, TX
3%
Phoenix, AZ
4%
Philadelphia, PA
17%
Denver, CO
4%
Washington, DC
24%
Atlanta, GA
20%
Miami, FL
99%
Seattle, WA
8%
Boston, MA
96%
New Orleans, LA
4%
San Francisco, CA
21%
$3,798 Vol.
New York, NY
48%
Los Angeles, CA
24%
Chicago, IL
100%
Houston, TX
99%
Dallas, TX
3%
Phoenix, AZ
4%
Philadelphia, PA
17%
Denver, CO
4%
Washington, DC
24%
Atlanta, GA
20%
Miami, FL
99%
Seattle, WA
8%
Boston, MA
96%
New Orleans, LA
4%
San Francisco, CA
21%
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 KNYC: 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 KNYC, published at https://forecast.weather.gov/product.php?site=NWS&product=CLI&issuedby=NYC.
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 KNYC: 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 KNYC, published at https://forecast.weather.gov/product.php?site=NWS&product=CLI&issuedby=NYC.
Resolver
0x65070BE91...Heavy rainfall on September 9, 2026, was concentrated in central Iowa, where a slow-moving frontal boundary triggered repeated thunderstorms and produced 3–6 inches of precipitation across the Des Moines metro and I-80 corridor, with some locations exceeding 5 inches according to NWS and CoCoRaHS reports. Official climatological summaries from stations such as Des Moines recorded daily totals well above normal, accompanied by flash flood warnings, while trace amounts fell in parts of Florida and Kansas amid isolated thunderstorms. In contrast, New York’s Central Park and several western sites measured zero precipitation under clearer conditions. Market-implied odds reflect these verified NWS/NOAA station measurements and regional radar totals, with traders weighting Midwest outcomes most heavily given the scale of observed accumulation and the resolution criteria tied to official daily reports. Updated model verification and final station data releases over the next 24–48 hours will confirm exact geographic boundaries for resolution.
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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