Trader consensus favors 78°F or higher at 58.5% implied probability for San Francisco's highest temperature on April 4, driven by NOAA GFS and ECMWF ensemble forecasts clustering in the mid-to-upper 70s°F at KSFO, the resolution station, amid a building high-pressure ridge over California following recent rains. This ridge suppresses the persistent marine layer, enabling adiabatic warming and reduced coastal stratus, with conditions echoing March's record heat when similar patterns pushed highs well above the April climatological average of 63°F. Model spread introduces uncertainty—persistent onshore flow could cap temps at 76-77°F (15.5%)—but current runs show consensus for above-normal heat. Watch NWS updates and 12Z model runs on April 3 for refinements ahead of the short-term landfall window.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in San Francisco on April 4?
Highest temperature in San Francisco on April 4?
78°F or higher 63%
76-77°F 9%
74-75°F 7%
68-69°F 3.6%
59°F or below
1%
60-61°F
<1%
62-63°F
<1%
64-65°F
<1%
66-67°F
<1%
68-69°F
4%
70-71°F
2%
72-73°F
3%
74-75°F
7%
76-77°F
9%
78°F or higher
63%
78°F or higher 63%
76-77°F 9%
74-75°F 7%
68-69°F 3.6%
59°F or below
1%
60-61°F
<1%
62-63°F
<1%
64-65°F
<1%
66-67°F
<1%
68-69°F
4%
70-71°F
2%
72-73°F
3%
74-75°F
7%
76-77°F
9%
78°F or higher
63%
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the San Francisco International Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFO.
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 to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Market Opened: Mar 29, 2026, 2:44 PM ET
Resolution Source
https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFOResolver
0x69c47De9D...The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the San Francisco International Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFO.
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 to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Resolution Source
https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFOResolver
0x69c47De9D...Trader consensus favors 78°F or higher at 58.5% implied probability for San Francisco's highest temperature on April 4, driven by NOAA GFS and ECMWF ensemble forecasts clustering in the mid-to-upper 70s°F at KSFO, the resolution station, amid a building high-pressure ridge over California following recent rains. This ridge suppresses the persistent marine layer, enabling adiabatic warming and reduced coastal stratus, with conditions echoing March's record heat when similar patterns pushed highs well above the April climatological average of 63°F. Model spread introduces uncertainty—persistent onshore flow could cap temps at 76-77°F (15.5%)—but current runs show consensus for above-normal heat. Watch NWS updates and 12Z model runs on April 3 for refinements ahead of the short-term landfall window.
Experimental AI-generated summary referencing Polymarket data · Updated
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