Seia Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Seia. The numbers are calculated over a 30-year period to provide a reliable average. Now, let’s explore all the details to give you a full picture.

Seia experiences significant rainfall throughout the year, averaging 1054 mm of precipitation annually.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm)

Significant seasonal changes in precipitation occur throughout the year. During the wet season, October receives substantial rainfall, averaging 144 mm of precipitation, recorded across 13 rainy days.

In contrast, the drier season, July brings less rainfall, with 16 mm over 6 rainy days.

October, the wettest month, has a maximum daytime temperature of 20°C. The city receives 166 hours of sunshine in this period. During the driest month July you can expect a temperature of 29°C. For more detailed insights into the city’s temperatures, visit our Seia Temperature page.

Annual Precipitation in Portugal

The map below shows the annual precipitation across Portugal. You can also select the different months in case you are interested in a specific month.

Amsterdam Precipitation Compared World Wide

Seia’s average annual precipitation is 1054 mm. Let’s compare this to some popular worldwide tourist destinations:

New York City, USA, receives 1276 mm of rainfall annually, with precipitation evenly distributed throughout the year.

In Shanghai, China, the annual average precipitation is 1347 mm, with a humid subtropical climate.

In Tokyo, Japan, the average annual precipitation is 1528 mm, with significant summer rains due to typhoon season.

Ho Chi Minh City, Vietnam, receives 1955 mm of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.

How is Precipitation Measured?

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

Interesting weather facts

• The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
• Approximately 70% of lightning bolts strike land rather than oceans.
• A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.

For more detailed information about Seia’s weather, including sunshine hours, humidity levels, and temperature data, visit our Seia Climate page.