5-day weather forecast for Portland, Maine

Weather forecast accuracy details for Portland, Maine

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
Provider High Temp Low Temp Icon Precip Text Precip Overall
AccuWeather   83.91% 83.91% 80.46% 87.36% 83.91%
Weather Underground   80.46% 81.61% 78.16% 78.16% 79.60%
The Weather Channel   87.36% 81.61% 73.56% 73.56% 79.02%
MeteoGroup   81.61% 81.61% 74.71% 74.71% 78.16%
National Weather Service   73.56% 72.41% 79.31% 79.31% 76.15%
CustomWeather   78.16% 80.46% 71.26% 71.26% 75.29%
WeatherBug   67.86% 71.43% 79.76% 79.76% 74.70%
Foreca   80.46% 73.56% 68.97% 68.97% 72.99%
Dark Sky (forecast.io)   47.13% 62.07% 78.16% 78.16% 66.38%
Persistence   43.21% 41.98% 49.38% 49.38% 45.99%
Weather Forecast Accuracy Data Last Year
Provider High Temp Low Temp Icon Precip Text Precip Overall
The Weather Channel   71.58% 67.82% 79.87% 79.87% 74.78%
MeteoGroup   69.18% 65.99% 79.52% 79.81% 73.62%
Foreca   71.12% 60.89% 78.97% 78.97% 72.49%
National Weather Service   63.70% 59.05% 80.35% 80.15% 70.81%
AccuWeather   62.24% 62.04% 78.52% 77.94% 70.18%
Weather Underground   65.51% 58.48% 78.42% 76.40% 69.70%
CustomWeather   64.26% 55.11% 75.63% 75.63% 67.65%
WeatherBug   54.99% 51.11% 81.63% 81.63% 67.34%
Persistence   30.48% 29.61% 57.75% 57.75% 43.90%
 
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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 white paper.

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