Weather forecast accuracy details for Portland, Oregon

These are the one- to three-day out accuracy percentages for high temperature, low temperature, icon forecast precipitation (both rain and snow), and text forecast precipitation (both rain and snow). Temperature accuracy is the percentage of forecasts within three degrees. Precipitation accuracy is the percentage of correct forecasts. The forecasts are collected in the evening.

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Weather Forecast Accuracy Data Last Month (February)

Provider High Temp Low Temp Icon Precip Text Precip Overall
Microsoft   88.51% 81.18% 96.55% 96.55% 90.70%
Foreca/Vaisala   89.66% 72.41% 94.25% 94.25% 87.64%
AccuWeather   78.67% 73.68% 88.00% 89.33% 82.42%
The Weather Channel   55.17% 64.37% 96.55% 96.55% 78.16%
NWS Digital Forecast   47.13% 52.87% 93.10% 93.10% 71.55%
AerisWeather   34.48% 57.47% 94.25% 94.25% 70.11%
Open-Meteo   55.17% 44.83% 89.66% 89.66% 69.83%
OpenWeather   47.13% 43.68% 91.95% 91.95% 68.68%
Pirate Weather   37.93% 35.63% 88.51% 88.51% 62.64%
World Weather Online   29.89% 26.44% 91.95% 91.95% 60.06%
Weatherbit   33.72% 50.57% 74.42% 74.42% 58.28%
Wetter   47.13% 48.28% 70.11% 55.17% 55.17%
Persistence   35.00% 37.70% 70.00% 70.00% 53.18%

Weather Forecast Accuracy Data Last Year (2023)

Provider High Temp Low Temp Icon Precip Text Precip Overall
The Weather Channel   76.43% 77.90% 92.77% 92.77% 84.96%
Microsoft   75.71% 77.24% 90.81% 90.81% 83.65%
Foreca/Vaisala   75.05% 74.49% 90.75% 90.75% 82.76%
AccuWeather   76.00% 74.40% 87.64% 87.93% 81.49%
AerisWeather   69.24% 67.96% 89.84% 89.93% 79.24%
Weatherbit   65.45% 63.66% 88.05% 88.05% 76.30%
NWS Digital Forecast   62.36% 65.43% 87.05% 87.05% 75.47%
OpenWeather   57.46% 45.12% 88.10% 88.10% 69.69%
Pirate Weather   46.72% 34.07% 89.72% 89.72% 65.06%
Wetter   46.78% 45.86% 82.97% 79.21% 63.70%
World Weather Online   49.33% 21.87% 86.59% 86.59% 61.09%
Persistence   41.83% 38.24% 68.96% 68.96% 54.50%

If this data feeds your inner weather geek, you'll probably be interested in the amazing amount of weather data available from ForecastWatch. Likewise, if you're looking to assess your own forecasting accuracy or would like to make more informed decisions about a weather provider you're considering or already use, we can provide data to help you.

The data here is calculated from forecasts and observations collected and analyzed by ForecastWatch. If you would like more information about the methods, scientific approach, and the quality controls employed to ensure the data and analyses are of the highest quality, please read this overview.

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