Redwood City (CA) Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Redwood City, California, United States of America. The figures are based on a 30-year period (1990–2020) to provide a reliable average. Now, let's explore all the details to give you a full picture.

Redwood City's climate is marked by below-average rainfall, accumulating 397 mm (16 in) of precipitation yearly. The distribution includes a distinct dry season during certain months as shown in the precipitation charts below.

Monthly Precipitation Levels

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

The climate in Redwood City shows significant variation throughout the year. Expect 96 mm (3.8 in) of precipitation during the wettest month December, distributed over 12 rainy days.

In contrast, July offers drier and sunnier days, with around 0 mm (0 in) of rainfall over 0 rainy days.

December, the wettest month, has a maximum daytime temperature of 15°C (59°F). The city receives 160 hours of sunshine in this period. During the driest month July you can expect a temperature of 26°C (79°F). For more detailed insights into the city's temperatures, visit our Redwood City Temperature page.

Redwood City's average annual precipitation is 397 mm (16 in). Let's compare this to some popular worldwide tourist destinations:

In Lisbon, Portugal, the average annual precipitation is 774 mm (30 in), characterized by wet winters and dry summers typical of the Mediterranean climate.

Beijing, China, receives 560 mm (22 in) of annual precipitation, concentrated in the summer months.

Perth, Australia, receives 565 mm (22 in) of rainfall annually, mostly during the winter months.

Bangkok, Thailand, experiences a tropical monsoon climate with 1668 mm (66 in) of annual rainfall, with the heaviest precipitation occurring during September and October.

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.

Climate change is affecting precipitation patterns worldwide, including Redwood City (CA):

• Changing Rainfall Patterns: Global warming causes drastic changes in the patterns of rainfall. Some areas have been experiencing increased frequency and intensity of rainfall, while other areas experience longer dry spells or even droughts.
• Local Impacts: Many regions are experiencing heavier rainfall in the winter months and drier, hotter summers. This affects agriculture, water resources, and ecosystems.

• "Ginger" was the longest-lasting Atlantic tropical storm, which spun around the open ocean for 28 days in 1971.
• The world's largest snowflake was recorded in the Guinness Book of Records, at 38 cm (15 inches) wide and 20 cm (7.9 inches) thick. The snowflake fell at Fort Keogh, Montana, USA, on 28 January 1887.
• The greatest snowfall recorded was on Mt. Rainier, Washington State, USA, over 31.5 meters (103 feet) fell during the winter of 1972.

For more detailed information about Redwood City (CA)'s weather, including sunshine hours, humidity levels, and temperature data, visit our Redwood City (CA) Climate page.