Sankt Augustin weather in September

In September, Sankt Augustin sees average daytime highs of 19°C and overnight lows near 11°C, with 68 mm of rain across 11 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 17°C by the end. The sky is clear or mostly clear about 20% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 24 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Sankt Augustin's 4th-clearest and 9th-windiest month. For the whole year in context, see Sankt Augustin's year-round climate.

Daytime high
19°
4th warmest
Overnight low
11°
9th coldest
Rainfall
68 mm
11 wet days
Daylight
12 h 24 min
6:14 AM – 6:37 PM
Cloud cover
65%
4th clearest
Wind
11 km/h
9th windiest
Solar energy
3.09 kWh/m²
Travel score
5.7
out of 10

Sankt Augustin is human settlement in Germany.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 20°C in the first days to 17°C by the end.

A typical September day in Sankt Augustin reaches about 19°C in the afternoon and slips back to 11°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 25°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12112
22112
32012
42012
52012
62012
72012
82012
92012
102011
112011
121911
131911
141911
151911
161911
171911
181911
191810
201810
211810
221810
231810
241810
251810
261710
271710
281710
291710
301710

How September really feels in Sankt Augustin

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Sankt Augustin weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 77142.88.20.0
Feb / 64123.79.70.3
Mar10° / 6813.61.611.52.0
Apr14° / 5310.90.313.54.0
May18° / 6411.9015.25.5
Jun21° / 12°7311.8016.26.0
Jul23° / 14°7713015.86.4
Aug23° / 14°8112.3014.36.4
Sep19° / 11°6811012.45.7
Oct14° / 7412.2010.43.7
Nov / 7613.518.71.4
Dec / 9115.53.57.80.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13664
23664
33763
43763
53862
63862
73862
83862
93862
103961
113862
123961
133961
143961
153961
163961
173961
184060
194060
203961
213961
223961
233862
243862
253862
263664
273565
283466
293268
303268

Chance of precipitation in September

Any precipitation

Sankt Augustin gets around 68 mm of rain over 11 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 37% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
237
337
437
537
638
738
838
938
1038
1138
1238
1338
1437
1537
1637
1737
1836
1936
2036
2136
2236
2336
2436
2537
2638
2738
2839
2940
3040

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 78% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
166268
267258
368257
469256
569256
670255
771245
871245
973234
1073234
1174224
1275214
1377203
1478193
1579183
1680173
1782162
1882162
1983152
2083152
2185141
2285141
2385141
2485141
2585141
2686140
2786140
2887130
2987130
3087130

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 24 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 114 minutes over September. Sunrise moves from 5:50 AM to 6:37 AM, and sunset from 7:12 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:507:12
213.35:527:09
313.25:537:07
413.25:557:05
513.15:577:02
613.05:587:00
713.06:006:58
812.96:016:56
912.86:036:53
1012.86:056:51
1112.76:066:49
1212.66:086:46
1312.66:096:44
1412.56:116:42
1512.46:136:39
1612.46:146:37
1712.36:166:35
1812.26:176:32
1912.26:196:30
2012.16:216:28
2112.06:226:25
2212.06:246:23
2311.96:256:20
2411.96:276:18
2511.86:296:16
2611.76:306:13
2711.76:326:11
2811.66:346:09
2911.56:356:07
3011.56:376:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.09 kWh/m².

For context, solar energy here swings from a low near 0.61 kWh/m² to a high of 5.32 kWh/m² in June across the year — September's 3.09 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.6Moderate
33.6Moderate
43.6Moderate
53.5Moderate
63.5Moderate
73.4Moderate
83.4Moderate
93.4Moderate
103.3Moderate
113.3Moderate
123.3Moderate
133.2Moderate
143.2Moderate
153.1Moderate
163.1Moderate
173.0Moderate
183.0Moderate
193.0Moderate
202.9Moderate
212.9Moderate
222.8Moderate
232.8Moderate
242.7Moderate
252.6Moderate
262.6Moderate
272.5Moderate
282.5Moderate
292.4Moderate
302.4Moderate
Planning a trip in September

Is September a good time to visit Sankt Augustin?

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

5.7
Sightseeing
4th-best month of the year
2.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Sankt Augustin for sightseeing.

What to pack for Sankt Augustin in September

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

In September, Sankt Augustin sees daytime highs around 19°C and nights near 11°C. Worth packing: rain gear. About 11 days see rain.

rain gear

UV index in Sankt Augustin in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sankt Augustin peaks around July 14 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 14UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul7High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Sankt Augustin?

Sankt Augustin sits at 50.8°N, 7.2°E, 69 m above sea level, in Germany. The nearest listed city is Siegburg, 3.0 km away.

Topography around Sankt Augustin

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

Within 3 km, the terrain around Sankt Augustin has only modest variations in elevation — a maximum elevation change of 112 m around an average of 73 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 416 m; within 80 km, large variations in elevation — a maximum elevation change of 1,046 m.

The land around Sankt Augustin is covered by trees (41%), artificial surfaces (30%) and grassland (21%) within 3 km, trees (51%) and grassland (20%) within 16 km, and trees (54%) within 80 km.

3 km
112 m
16 km
416 m
80 km
1,046 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Siegburg 3.0 km · Troisdorf 5.0 km · Hennef (Sieg) 6.0 km · Lohmar 7.0 km · Bonn 8.0 km · Königswinter 11 km · Niederkassel 12 km · Bonn Hardtberg 13 km

Germany travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 80% of US
price level, 2025
GDP per capita
$60,496
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
0.9
per 100k, 2023
Road deaths
3.8
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 615
Religion
none 44%Roman Catholic 25%Protestant 23%other 5%

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 Sankt Augustin (50.7754°, 7.197°, elevation 69 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).