San Francisco Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in San Francisco, Cundinamarca, Colombia. Long-term data from 1990 to 2020 was used to calculate these averages. Now, let's break down all the details for a clearer picture.

San Francisco experiences significant rainfall throughout the year, averaging 3260 mm (128 in) of precipitation annually.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

The climate in San Francisco shows significant variation throughout the year. Expect 385 mm (15 in) of precipitation during the wettest month April, distributed over 18 rainy days.

In contrast, August offers drier and sunnier days, with around 173 mm (6.8 in) of rainfall over 14 rainy days.

April, the wettest month, has a maximum daytime temperature of 22°C (72°F). The city receives 88 hours of sunshine in this period. During the driest month August you can expect a temperature of 23°C (73°F). For more detailed insights into the city's temperatures, visit our San Francisco Temperature page.

San Francisco's average annual precipitation is 3260 mm (128 in). Let's compare this to some popular worldwide tourist destinations:

In Barcelona, Spain, the average annual precipitation is 644 mm (25 in), evenly distributed across the year with no extreme wet or dry seasons.

In Seoul, South Korea, the average annual precipitation is 1237 mm (49 in), with most rain falling during the summer monsoon season.

Melbourne, Australia, has 690 mm (27 in) of rainfall annually, spread fairly evenly throughout the year.

Singapore, situated near the equator, gets 2581 mm (102 in) of rainfall annually, with no distinct dry season and consistent monthly precipitation.

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.

The proximity of a location to a large body of water can significantly affect its rainfall patterns:

• Ocean Influence: Coastal regions typically receive more rainfall due to the presence of moisture-laden winds from the ocean. These regions tend to have more humid climates and experience more frequent precipitation, especially in winter.
• Continental Climates: Areas further from the sea, such as inland or continental regions, experience less frequent rainfall and more extreme seasonal variations in precipitation.

• 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 Francisco's weather, including sunshine hours, humidity levels, and temperature data, visit our San Francisco Climate page.