Nairobi Weather in September

🇰🇪 Kenya

24°C

High

13°C

Low

Rain Days

10h

Sunshine

82%

Humidity

Africa › 🇰🇪 Kenya › Nairobi

Updated: March 2026

Is September a Good Time to Visit Nairobi?

8/10

Excellent

September is a excellent time to visit Nairobi (8/10). With 10 daily sunshine hours and only 4 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 8th sunniest of the year in Nairobi. Beach and outdoor-focused visitors will find September ideal, though hotel prices reflect demand and popular sites get crowded by mid-morning. August offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Nairobi's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: book accommodation at least 6-8 weeks ahead, as popular hotels fill quickly during September. Purchasing skip-the-line tickets for major attractions in advance saves meaningful time. If you have flexibility, arriving a few days before or after peak weekends reduces both crowds and prices noticeably.

vs August:22°C avg high

September weather in Nairobi is defined by a daily temperature swing from 13°C at night to 24°C during the afternoon. Humidity averages 82%, and you can count on around 10 sunshine hours each day. That combination makes September warm and lush, though dressing in breathable fabrics keeps things manageable.

24°C

Avg High

13°C

Avg Low

4 days

Rain Days

10h

Sunshine

82%

Humidity

Temperature in Nairobi in September

The 11°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. At 82% humidity, the 24°C daytime high feels 2-4°C warmer in practice: quick-dry fabrics and shade-seeking between noon and 3pm are the sensible response. UV index averages 6 this month, classed as moderate. Sunscreen is a sensible precaution for extended outdoor time, particularly at midday. Winds are calm at an average 14 km/h, so wind-chill is not a factor in planning your clothing. In Fahrenheit: 75°F average high, 55°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).

Temperature in September

Monthly Precipitation (mm)

What to Wear in Nairobi in September

Morning13°CBefore the day warms up

Afternoon24°CPeak daytime temperature

Evening16°CAfter sunset cools down

Packing for Nairobi in September means dressing for 24°C days and 13°C evenings. A light cotton tee with a casual overshirt works well at 24°C, the overshirt doubles as a layer for air-conditioned venues. Evenings drop 11°C to around 13°C, a notable shift that catches underprepared visitors off guard. Pack a dedicated evening layer. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues. At 82% average humidity, quick-dry synthetic or bamboo fabrics dry overnight and stay comfortable longer than cotton.

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Local tip: Layers are more practical than a single heavy garment in Nairobi. The day-to-evening temperature shift rewards packing a versatile mid-layer you can add or remove as conditions change.

Events in Nairobi in September

September has no major festivals or public holidays in Nairobi, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.

What to Pack for Nairobi in September

Based on 24°C average highs and 4 rainy days

Light layers for morning and evening
Breathable T-shirts and comfortable trousers
UV-protective sunglasses
SPF 30+ sunscreen
Comfortable walking shoes (a second pair lets the first air out overnight)
Universal travel adapter
Small day pack for city exploration
Reusable water bottle

Best Activities in Nairobi in September

Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 24°C, the temperature is ideal for extended walking without overheating
Guided walking tour of the historic centreMorning or late afternoonComfortable temperatures allow several hours on foot without fatigue
Visit rooftop viewpoints and observation decksGolden hour (1 hour before sunset)Warm clear evenings provide exceptional visibility for panoramic photography
Day trip to the surrounding countryside or coastFull day (depart by 8am)September is reliably dry enough for rural day trips without weather risk
Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningSeptember brings distinct seasonal changes to public green spaces worth exploring
Try the seasonal farmer's market for local produce and street foodSaturday morning markets typically 8am-1pmSeptember seasonal produce is at peak availability, offering dishes not found at other times of year

Why is Nairobi mild in September?

In September, Nairobi sits in the dry season corridor, as the ITCZ shifts away from the region and trade winds bring drier, more stable air. This produces reliably sunny days reaching 24°C, with lower humidity than the wet months. Overnight lows of 13°C offer a pleasant reprieve from the midday heat. Climate data: Open-Meteo ERA5 (1991–2020).

Sunshine Hours

The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.

UV Index

A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate -- wear sunscreen. UV 6-7: High -- hat and SPF 30+ essential. UV 8-10: Very High -- limit midday exposure. UV 11+: Extreme -- seek shade between 10am-4pm.

Rain Days

A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.

Humidity

Relative humidity as a percentage. Below 40%: Dry -- skin and throat may feel parched. 40-60%: Comfortable -- ideal for most people. 60-80%: Sticky -- light, breathable fabrics recommended. Above 80%: Muggy -- heat feels more intense; quick-dry clothing is essential.

Frequently Asked Questions: Nairobi in September

In September, Nairobi experiences average highs of 24°C (75°F) and lows of 13°C (55°F). Expect around 4 rainy days and 10 hours of sunshine per day, with humidity averaging 82%. The 11°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 6, so sun protection is advisable on clear days.

Nairobi typically sees 4 rainy days in September, with total precipitation of around 19mm. This makes September one of the drier months of the year, and a reliable window for outdoor sightseeing and day trips. Rain showers tend to be brief when they do occur. For context, the driest month in Nairobi typically sees 4-6 fewer rain days than September.

Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Nairobi in September. Daytime temperatures of 24°C are pleasant, but the evening drop to 13°C means a jacket is essential if you plan to be out after dark. Rain is infrequent with only 4 wet days, so a light rain layer is optional. Comfortable walking shoes are a priority given the amount of ground most visitors cover.

Yes, September is an excellent time to visit Nairobi. With 10 daily sunshine hours and only 4 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 24°C during the day are comfortable for long walks and outdoor dining. This is peak travel season, so booking accommodation in advance and arriving at popular attractions early in the morning helps avoid the busiest periods.

The average high temperature in Nairobi in September is 24°C (75°F), and the average low is 13°C (55°F). The mean daily temperature is approximately 19°C (65°F). The day-to-night range of 11°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.

The best month to visit Nairobi is generally January. January offers the most sunshine at 11 hours per day and only 7 rainy days. Average temperatures reach 26°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around January gives you the best chance of dry, bright weather.

September is shoulder or low season in Nairobi, meaning fewer tourists and generally lower prices than peak months. With 10 sunshine hours and 4 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.

In September, Nairobi suits a range of activities thanks to mild temperatures around 24°C. With few rainy days, outdoor activities are highly recommended. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 10 hours of sunshine, parks and waterfront walks are particularly enjoyable.

September ranks 8th sunniest of the year in Nairobi, with an average 10 daily sunshine hours. The driest months are July, September, and August. February is the hottest month (27°C avg high); June is the coolest (22°C). From here, temperatures rise 1°C into October. Compared to last month (August: 22°C high, 5 rain days), September is warmer and drier. September sits in the middle of the annual sunshine ranking for Nairobi, offering a reasonable balance of good weather and manageable crowds.

Year-Round Climate

Month	High	Low	Rain Days	Sun	Details
January	26°C	14°C	7	11h	View
February	27°C	15°C	6	11h	View
March	27°C	16°C	11	11h	View
April	25°C	16°C	20	10h	View
May	23°C	15°C	16	10h	View
June	22°C	14°C	8	9h	View
July	22°C	12°C	4	8h	View
August	22°C	13°C	5	8h	View
September	24°C	13°C	4	10h	View
October	25°C	15°C	10	11h	View
November	23°C	15°C	19	10h	View
December	24°C	14°C	11	11h	View

Other Months in Nairobi

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Plan Your Trip to Nairobi

Best Time to Visit Nairobi

Data Sources for Nairobi

Nairobi on Wikipedia Open-Meteo Climate API NOAA National Centers UK Met Office WMO GeoNames

Climate normals represent 30-year averages (1991-2020). Individual years may vary.