Deder weather in September

In September, Deder sees average daytime highs of 23°C and overnight lows near 15°C, with 89 mm of rain across 16.4 wet days and about 12.1 hours of daylight. It is the 9th-warmest and 7th-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 30% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 12 h 12 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Deder's 5th-clearest and 4th-windiest month. For the whole year in context, see Deder's year-round climate.

Daytime high
23°
9th warmest
Overnight low
15°
8th coldest
Rainfall
89 mm
16.4 wet days
Daylight
12 h 06 min
6:07 AM – 6:10 PM
Cloud cover
50%
5th clearest
Wind
6 km/h
4th windiest
Solar energy
5.69 kWh/m²
Travel score
5.9
out of 10

Deder is town in Oromia, Ethiopia.

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 Deder reaches about 23°C in the afternoon and slips back to 15°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 24°C. Set against its neighbours, September runs on par with August and on par with October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12315
22315
32315
42315
52315
62315
72315
82315
92315
102315
112315
122315
132315
142315
152315
162315
172315
182315
192315
202315
212315
222315
232315
242315
252315
262315
272315
282315
292315
302315

Deder weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan23° / 12°183.811.58.3
Feb25° / 14°254.111.78.0
Mar25° / 15°9010.411.96.9
Apr24° / 15°18518.412.25.6
May24° / 15°25022.912.45.0
Jun24° / 15°751512.56.1
Jul23° / 14°941912.55.5
Aug22° / 14°1062012.35.3
Sep23° / 15°8916.412.15.9
Oct23° / 13°1001311.86.6
Nov23° / 12°405.111.67.9
Dec23° / 12°172.911.58.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 44% of September, with mostly cloudy or overcast conditions the remaining 27%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17723
27723
37822
47822
57822
67822
77822
87822
97822
107822
117822
127723
137723
147624
157525
167525
177426
187426
197426
207228
217228
227129
237030
246931
256832
266733
276634
286436
296238
306238

Chance of precipitation in September

Any precipitation

Deder gets around 89 mm of rain over 16.4 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 55% and peaks near 60% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
160
259
358
457
557
657
756
856
956
1056
1155
1255
1355
1454
1554
1654
1754
1854
1954
2054
2154
2254
2353
2453
2553
2652
2752
2852
2952
3052

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 55% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
143561
243561
344551
444551
544551
644551
744551
844551
944551
1044551
1144551
1244551
1344542
1444542
1544542
1643552
1743552
1843552
1943552
2043552
2143552
2243552
2343552
2443552
2544542
2644542
2745532
2845532
2946522
3047512

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 12 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over September. Sunrise moves from 6:09 AM to 6:06 AM, and sunset from 6:19 PM to 6:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:096:19
212.26:086:19
312.26:086:18
412.26:086:18
512.16:086:17
612.16:086:16
712.16:086:16
812.16:086:15
912.16:086:14
1012.16:086:14
1112.16:086:13
1212.16:076:13
1312.16:076:12
1412.16:076:11
1512.16:076:11
1612.16:076:10
1712.06:076:09
1812.06:076:09
1912.06:076:08
2012.06:076:08
2112.06:066:07
2212.06:066:06
2312.06:066:06
2412.06:066:05
2512.06:066:04
2612.06:066:04
2712.06:066:03
2811.96:066:03
2911.96:066:02
3011.96:066:01

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.69 kWh/m².

For context, solar energy here swings from a low near 5.21 kWh/m² to a high of 6.23 kWh/m² in February across the year — September's 5.69 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.7Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.6Bright
295.6Bright
305.6Bright
Planning a trip in September

Hazard calendar for Deder

In seasonPeak

None of Deder's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Deder's rainy season runs April–May, when most of the year's rain falls.

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

Is September a good time to visit Deder?

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

5.9
Sightseeing
8th-best month of the year
4.5
Beach & pool
9th-best month of the year

September is a reasonable time to visit Deder for sightseeing.

What to pack for Deder in September

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

In September, Deder sees daytime highs around 23°C and nights near 15°C. Pack rain gear. Worth having: light clothes and sun protection. About 16 days see rain.

rain gearlight clothessun protection

UV index in Deder in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Deder peaks around March 18 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 23 at about 11 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 18UV 16Nov 23UV 11
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar16Extreme
Apr15Extreme
May13Extreme
Jun12Extreme
Jul11Extreme
Aug14Extreme
Sep13Extreme
Oct13Extreme
Nov11Extreme
Dec11Extreme

Air quality in Deder 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 Deder is worst in November — around 28 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateNov 2128 µg/m³Aug 1819 µg/m³
PM2.5 (µg/m³)Level
Jan27Moderate
Feb27Moderate
Mar26Moderate
Apr22Moderate
May21Moderate
Jun24Moderate
Jul23Moderate
Aug19Moderate
Sep21Moderate
Oct27Moderate
Nov28Moderate
Dec28Moderate
Location & terrain

Where is Deder?

Deder sits at 9.3°N, 41.4°E, 2,330 m above sea level, in Ethiopia. The nearest listed city is Chelenko, 16 km away.

Topography around Deder

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

Within 3 km, the terrain around Deder has large variations in elevation — a maximum elevation change of 794 m around an average of 2,304 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,641 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,673 m.

The land around Deder is covered by cropland (48%) and shrubs (38%) within 3 km, shrubs (54%) and cropland (41%) within 16 km, and shrubs (57%) and grassland (20%) within 80 km.

3 km
794 m
16 km
1,641 m
80 km
2,673 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Chelenko 16 km · Hīrna 39 km · Dire Dawa 56 km · ‘Alemaya 63 km · Āsbe Teferī 68 km · Harar 74 km · Mī’ēso 76 km · Felana 83 km

Ethiopia travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type C / E / F / L
220 V · 50 Hz
Prices
≈ 37% of US
price level, 2025
GDP per capita
$933
2025
Happiness
4.0 / 10
World Happiness, 2025
Safe drinking water
14%
of population, 2024
Homicide rate
8.5
per 100k, 2012
Road deaths
28.2
per 100k/yr, 2019
Income group
Low
World Bank
English
Low
EF EPI 499
Religion
Ethiopian Orthodox 44%Muslim 31%Protestant 23%other 1%

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 Deder (9.3117°, 41.443°, elevation 2,330 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).