Nairobi residents are experiencing a relatively calm weather pattern this Sunday, September 21, 2025. The day began with mild sunshine, but as the afternoon progressed, clouds rolled in, creating a cooler atmosphere across the city. Early afternoon temperatures hovered around 25 °C (77 °F), offering comfortable conditions for both indoor and outdoor activities.
Evening and Night Outlook
Cloud cover is expected to persist into the evening, keeping the skies mostly gray. Between 6:00 PM and 8:00 PM, temperatures will ease to 24 °C (76 °F). By late evening around 10:00 PM, they should dip further to 21–22 °C (70–72 °F). Despite the cloudy conditions, no rainfall is forecast, ensuring a dry evening commute for city residents.
As night deepens, the air will gradually cool. By midnight, Nairobi will register between 17–19 °C (63–66 °F), before dropping to the coolest point near dawn at 15–16 °C (58–60 °F). This overnight chill is typical for Nairobi in September, particularly when heavy clouds block the day’s warmth from lingering.
What Residents Should Expect
- Comfortable evening weather: Ideal for casual walks, outdoor dining, or relaxed gatherings.
- Light jacket recommended: Cloudy conditions may make the air feel cooler than the thermometer suggests, especially late at night.
- Dry roads: With no rain expected, traffic disruptions from wet or muddy conditions are unlikely.
Seasonal Context
September marks a transitional period in Nairobi’s climate, bridging the cooler mid-year months and the short rains season expected in late October. Cloudy evenings, mild temperatures, and shifting breezes are typical features of this change.
Air Quality
Air quality across Nairobi today remains moderate, with no major dust storms or pollution alerts. However, emissions from evening traffic may elevate localized pollution levels in busy corridors such as Westlands, the CBD, and Mombasa Road.
Bottom Line
Overall, Nairobians can expect a calm and dry Sunday evening under mostly cloudy skies. With mild temperatures and no rainfall, it is the perfect night for relaxed outdoor activities before the start of a new week.
