San Sebastian Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in San Sebastian. The numbers are calculated over a 30-year period to provide a reliable average. Now, let’s break down all the details for a clearer picture.

San Sebastian experiences significant rainfall throughout the year, averaging 1086 mm of precipitation annually.

Monthly Precipitation Levels

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

The seasons in San Sebastian, bring significant changes in precipitation. The wettest month, September, receives high rainfall, with an average of 158 mm of precipitation.

This rainfall is distributed across 17 rainy days. In contrast, the driest month, January, experiences much less rainfall, totaling 34 mm over 19 rainy days. These distinct seasonal differences provide diverse experiences throughout the year.

September, the wettest month, has a maximum daytime temperature of 31°C. During the driest month January you can expect a temperature of 29°C. For more detailed insights into the city’s temperatures, visit our San Sebastian Temperature page.

Annual Precipitation in Puerto Rico

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

Amsterdam Precipitation Compared World Wide

San Sebastian’s average annual precipitation is 1086 mm. Let’s compare this to some popular worldwide tourist destinations:

In Barcelona, Spain, the average annual precipitation is 644 mm, evenly distributed across the year with no extreme wet or dry seasons.

In Seoul, South Korea, the average annual precipitation is 1237 mm, with most rain falling during the summer monsoon season.

Perth, Australia, receives 565 mm of rainfall annually, mostly during the winter months.

Bangkok, Thailand, experiences a tropical monsoon climate with 1668 mm of annual rainfall, with the heaviest precipitation occurring during September and October.

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 San Sebastian’s weather, including sunshine hours, humidity levels, and temperature data, visit our San Sebastian Climate page.