Ruiru Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Ruiru, Kenya. These values are calculated using 30 years of data (1990–2020) to ensure accuracy. Now, let's break down all the details for a clearer picture.
Generally, Ruiru experiences moderate precipitation patterns, averaging 809 mm (32 in) yearly. However, this average masks significant seasonal variation, including a distinct dry season during certain months that are clearly visible in our monthly breakdown below.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
Ruiru can be quite wet during April, receiving approximately 155 mm (6.1 in) of precipitation over 19 rainy days.
In contrast September, experiences much drier conditions, with 22 mm (0.9 in) of rainfall, spread across 5 rainy days.
April, the wettest month, has a maximum daytime temperature of 26°C (79°F). The city receives 204 hours of sunshine in this period. During the driest month September you can expect a temperature of 26°C (79°F). For more detailed insights into the city's temperatures, visit our Ruiru Temperature page.
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in June
Explore Ruiru's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Ruiru spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in Kenya: City Comparison
The map below shows the annual precipitation across Kenya. You can also select the different months in case you are interested in a specific month.
heavy rainfall
high
moderate
low
almost none
Ruiru vs World: Rainfall Compared
Ruiru's average annual precipitation is 809 mm (32 in). Let's compare this to some popular worldwide tourist destinations:
The climate in San Francisco, USA, is influenced by coastal weather, with 469 mm (18 in) of rainfall mostly during the winter months.
In Seoul, South Korea, the average annual precipitation is 1237 mm (49 in), with most rain falling during the summer monsoon season.
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 Ruiru:
- 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 Ruiru's weather, including sunshine hours, humidity levels, and temperature data, visit our Ruiru Climate page.
