Climate Insights for Ruiru

The climate in Ruiru is warm and mild. The average annual temperature is 20°C and approximately 614mm of precipitation falls per year. April is the wettest month, receiving around 151mm of rainfall. Ruiru sits near the equator, so seasonal temperature differences are minimal throughout the year.

Ruiru sees moderate temperature variation throughout the year, ranging from 14°C to 28°C. The warmest month is March, when average highs reach 28°C and the mean temperature sits around 22°C. August is the coolest month, with minimum temperatures around 14°C and an average of 19°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs.

Ruiru is a relatively dry area, receiving approximately 614mm of precipitation annually, which averages out to around 51mm per month. The wettest month is April, averaging 151mm of rainfall. November and May also tend to see above-average precipitation. The driest month is August, with just 11mm. That's 140mm less than April, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Ruiru is mildly breezy, with an average annual wind speed of 14km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/h gap between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 11km/h in winter, 14km/h in spring, 17km/h in summer, 14km/h in autumn.

It is currently autumn in Ruiru, which began on March 20, 2026. Ruiru sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in March at around 28°C, while the coldest stretch bottoms out in August near 14°C. Winter is next, beginning on June 21, 2026 — 90 days from now.

The best time to visit Ruiru is during January, February, March, May, June, July, August, September, October and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 34mm per month. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Ruiru based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.