Simi Valley (CA) Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Simi Valley (CA). The numbers are calculated over a 30-year period to provide a reliable average. Let's now guide you through the details for a complete overview.

Simi Valley's climate is marked by below-average rainfall, accumulating 280 mm of precipitation yearly.

Monthly Precipitation Levels

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

Simi Valley can be quite wet during January, receiving approximately 62 mm of precipitation over 5 rainy days.

In contrast August, experiences much drier conditions, with 0.1 mm of rainfall, spread across 0 rainy days.

January, the city’s wettest month, has a maximum daytime temperature of 19°C and receives 224 hours of sunshine. During the driest month August you can expect a temperature of 31°C. For more detailed insights into the city’s temperatures, visit our Simi Valley Temperature page.

Annual Precipitation in the United States of America

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

Amsterdam Precipitation Compared World Wide

Simi Valley’s average annual precipitation is 280 mm. Let’s compare this to some popular worldwide tourist destinations:

The climate in San Francisco, USA, is influenced by coastal weather, with 469 mm of rainfall mostly during the winter months.

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

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

Kuala Lumpur, Malaysia, receives 2529 mm of annual rainfall, characteristic of its equatorial tropical rainforest climate, with consistent rainfall throughout the year and peak months during March and November.

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.

Sea vs. Land Precipitation

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.

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