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Answer by Roker5407. Confidence votes 73. If you are looking for the average rainfall (which actually means yearly rainfall) I'm glad to help. The average (or yearly) precipitation (or rainfall) is about 786mm/31 inches annually (per year)!or nearly 5 inches of precipitation every year. Al â¦ though, for the past 2 years we have been experiencing higher amounts of rainfall in the spring, and cooler temperatures during the summer. This April we are expected to reach 12 inches of rain in some parts of the state. The average for April is 3.4 inches.
Average Rainfall for Portugal in September. The tables below give monthly averages for rainfall during September at cities in Portugal. Each place has a total for how many days of wet weather it usually gets this month and for the normal amount of precipitation. The calculation of days only includes the days when precipitation totalled at least one millimetre (0.04 inches).