Nanyuki weather in September

In September, Nanyuki sees average daytime highs of 23°C and overnight lows near 12°C, with 41 mm of rain across 8.5 wet days and about 12 hours of daylight. It is the 6th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 23°C through the month. The sky is clear or mostly clear about 26% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Nanyuki's 4th-clearest and 1st-windiest month. For the whole year in context, see Nanyuki's year-round climate.

Daytime high
23°
6th warmest
Overnight low
12°
6th coldest
Rainfall
41 mm
8.5 wet days
Daylight
12 hours
6:26 AM – 6:26 PM
Cloud cover
56%
4th clearest
Wind
8 km/h
1st windiest
Solar energy
6.27 kWh/m²
Travel score
7.0
out of 10

Nanyuki is town in Laikipia County, Kenya.

Founded
1907

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 23°C through the month.

A typical September day in Nanyuki reaches about 23°C in the afternoon and slips back to 12°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 25°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12212
22212
32212
42212
52212
62212
72212
82212
92212
102312
112312
122312
132312
142312
152312
162312
172312
182312
192312
202312
212312
222312
232312
242312
252312
262312
272312
282412
292412
302412

Nanyuki weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 12°457.5127.5
Feb25° / 12°334.9127.6
Mar25° / 13°6610.5126.8
Apr24° / 14°21819.7125.2
May23° / 14°19915.4126.0
Jun22° / 13°429126.6
Jul21° / 12°4510.2126.3
Aug21° / 12°5410.9126.3
Sep23° / 12°418.5127.0
Oct23° / 13°21918.1125.6
Nov22° / 13°20322.4124.7
Dec23° / 12°6212.8126.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 33% of September, with mostly cloudy or overcast conditions the remaining 41%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14951
25149
35149
45248
55248
65446
75446
85545
95743
105743
115941
126040
136040
146139
156238
166238
176337
186337
196337
206337
216337
226337
236337
246238
256139
266139
276139
286040
296040
306040

Chance of precipitation in September

Any precipitation

Nanyuki gets around 41 mm of rain over 8.5 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 29% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
236
336
435
534
633
732
831
930
1029
1128
1227
1326
1426
1525
1625
1724
1824
1924
2025
2125
2225
2326
2427
2528
2629
2730
2831
2932
3034

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 95% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1919
2919
3919
4928
5928
6928
7937
8937
9946
10946
11946
12955
13955
14964
15964
16964
17973
18973
19973
20973
21973
22973
23973
24973
25973
26973
27973
28973
29973
30973

Wind in September

Winds average 8 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 hours at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over September. Sunrise moves from 6:31 AM to 6:21 AM, and sunset from 6:31 PM to 6:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:316:31
212.06:316:31
312.06:316:31
412.06:306:30
512.06:306:30
612.06:306:30
712.06:296:29
812.06:296:29
912.06:296:29
1012.06:286:28
1112.06:286:28
1212.06:286:28
1312.06:276:27
1412.06:276:27
1512.06:266:26
1612.06:266:26
1712.06:266:26
1812.06:256:25
1912.06:256:25
2012.06:256:25
2112.06:246:24
2212.06:246:24
2312.06:236:23
2412.06:236:23
2512.06:236:23
2612.06:226:22
2712.06:226:22
2812.06:226:22
2912.06:216:21
3012.06:216:21

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.27 kWh/m².

For context, solar energy here swings from a low near 5.01 kWh/m² to a high of 6.9 kWh/m² in February across the year — September's 6.27 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.9Bright
55.9Bright
66.0Bright
76.0Intense
86.0Intense
96.1Intense
106.1Intense
116.2Intense
126.2Intense
136.2Intense
146.3Intense
156.3Intense
166.3Intense
176.4Intense
186.4Intense
196.4Intense
206.4Intense
216.4Intense
226.4Intense
236.5Intense
246.5Intense
256.5Intense
266.4Intense
276.4Intense
286.4Intense
296.4Intense
306.4Intense
Planning a trip in September

Is September a good time to visit Nanyuki?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

7.0
Sightseeing
3rd-best month of the year
5.3
Beach & pool
4th-best month of the year

September is one of the better times to visit Nanyuki for general sightseeing.

What to pack for Nanyuki in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Nanyuki sees daytime highs around 23°C and nights near 12°C. Pack sun protection. Worth having: light clothes and rain gear. About 9 days see rain.

sun protectionlight clothesrain gear

UV index in Nanyuki in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Nanyuki peaks around March 16 at about 17 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 11 (extreme).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 16UV 17Jun 19UV 11
UV index (midday)Level
Jan16Extreme
Feb16Extreme
Mar17Extreme
Apr16Extreme
May13Extreme
Jun11Extreme
Jul12Extreme
Aug12Extreme
Sep14Extreme
Oct15Extreme
Nov14Extreme
Dec13Extreme

Air quality in Nanyuki in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Nanyuki is worst in June — around 34 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateJun 2334 µg/m³Oct 1224 µg/m³
PM2.5 (µg/m³)Level
Jan27Moderate
Feb31Moderate
Mar28Moderate
Apr27Moderate
May28Moderate
Jun34Moderate
Jul34Moderate
Aug28Moderate
Sep25Moderate
Oct24Moderate
Nov27Moderate
Dec28Moderate
Location & terrain

Where is Nanyuki?

Nanyuki sits at 0.0°N, 37.1°E, 1,951 m above sea level, in Kenya. The nearest listed city is Nyeri, 49 km away.

MeruIsioloChukaMairo Inya

Topography around Nanyuki

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Nanyuki.

Within 3 km, the terrain around Nanyuki has only modest variations in elevation — a maximum elevation change of 133 m around an average of 1,946 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 896 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,231 m.

The land around Nanyuki is covered by grassland (34%) and artificial surfaces (27%) within 3 km, grassland (46%), trees (21%) and shrubs (20%) within 16 km, and grassland (40%), trees (25%) and shrubs (23%) within 80 km.

3 km
133 m
16 km
896 m
80 km
4,231 m
treesshrubsgrasslandcroplandartificial surfaces
September weather nearby: Nyeri 49 km · Tetu 52 km · Karatina 55 km · Kerugoya 61 km · Meru 65 km · Isiolo 69 km · Chuka 74 km · Mairo Inya 74 km

Kenya travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type G
240 V · 50 Hz
Prices
≈ 34% of US
price level, 2025
GDP per capita
$2,363
2025
Happiness
4.7 / 10
World Happiness, 2025
Homicide rate
4.9
per 100k, 2022
Road deaths
28.3
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
High
EF EPI 593
Religion
Christian 86%Muslim 11%other 2%none 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Nanyuki (0.0062°, 37.074°, elevation 1,951 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).