Bad Neuenahr-Ahrweiler weather in September

In September, Bad Neuenahr-Ahrweiler sees average daytime highs of 18°C and overnight lows near 10°C, with 60 mm of rain across 10.1 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 16°C by the end. The sky is clear or mostly clear about 19% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 18 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Bad Neuenahr-Ahrweiler's 3rd-clearest and 8th-windiest month. For the whole year in context, see Bad Neuenahr-Ahrweiler's year-round climate.

Daytime high
18°
4th warmest
Overnight low
10°
9th coldest
Rainfall
60 mm
10.1 wet days
Daylight
12 h 24 min
6:15 AM – 6:37 PM
Cloud cover
65%
3rd clearest
Wind
11 km/h
8th windiest
Solar energy
3.13 kWh/m²
Travel score
5.6
out of 10

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 16°C by the end.

A typical September day in Bad Neuenahr-Ahrweiler reaches about 18°C in the afternoon and slips back to 10°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 24°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12012
22011
32011
41911
51911
61911
71911
81911
91911
101911
111911
121810
131810
141810
151810
161810
171810
181810
191810
201710
211710
22179
23179
24179
25179
26179
27169
28169
29169
30169

How September really feels in Bad Neuenahr-Ahrweiler

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.

Bad Neuenahr-Ahrweiler weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -0°5512.33.68.30.0
Feb / -0°4810.94.39.70.1
Mar / 5712.72.411.51.7
Apr13° / 5011.40.513.53.5
May17° / 6912.5015.25.0
Jun20° / 11°7612.8016.15.7
Jul22° / 13°8013.6015.86.1
Aug22° / 13°7812.6014.36.2
Sep18° / 10°6010.1012.45.6
Oct13° / 5811.60.110.43.4
Nov / 5712.31.28.71.1
Dec / 6513.34.17.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13763
23763
33763
43763
53763
63763
73862
83862
93862
103862
113862
123862
133862
143862
153961
163961
173961
183862
193862
203862
213862
223862
233664
243664
253664
263664
273367
283367
293268
303070

Chance of precipitation in September

Any precipitation

Bad Neuenahr-Ahrweiler gets around 60 mm of rain over 10.1 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 35% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
136
235
335
434
534
634
734
834
934
1034
1134
1234
1333
1433
1533
1633
1733
1834
1934
2034
2134
2235
2335
2436
2536
2637
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 83% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
171236
272235
373225
474224
575223
676213
776213
877212
978202
1078202
1179192
1280182
1382171
1483161
1584151
1685141
1786131
1886131
1987121
2088120
2189110
2289110
2390100
2490100
259190
269190
279190
289190
299190
309280

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2912calm
3012calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 18 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 108 minutes over September. Sunrise moves from 5:51 AM to 6:37 AM, and sunset from 7:12 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:517:12
213.35:537:09
313.25:547:07
413.25:567:05
513.15:577:03
613.05:597:00
713.06:006:58
812.96:026:56
912.86:046:53
1012.86:056:51
1112.76:076:49
1212.66:086:46
1312.66:106:44
1412.56:116:42
1512.46:136:39
1612.46:156:37
1712.36:166:35
1812.26:186:32
1912.26:196:30
2012.16:216:28
2112.06:236:25
2212.06:246:23
2311.96:266:21
2411.96:276:19
2511.86:296:16
2611.76:316:14
2711.76:326:12
2811.66:346:09
2911.56:356:07
3011.56:376:05

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.13 kWh/m².

For context, solar energy here swings from a low near 0.64 kWh/m² to a high of 5.37 kWh/m² in June across the year — September's 3.13 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.7Moderate
33.6Moderate
43.6Moderate
53.6Moderate
63.5Moderate
73.5Moderate
83.4Moderate
93.4Moderate
103.4Moderate
113.3Moderate
123.3Moderate
133.3Moderate
143.2Moderate
153.2Moderate
163.1Moderate
173.1Moderate
183.0Moderate
193.0Moderate
202.9Moderate
212.9Moderate
222.8Moderate
232.8Moderate
242.7Moderate
252.7Moderate
262.6Moderate
272.6Moderate
282.5Moderate
292.5Moderate
302.4Moderate
Planning a trip in September

Is September a good time to visit Bad Neuenahr-Ahrweiler?

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

5.6
Sightseeing
4th-best month of the year
1.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Bad Neuenahr-Ahrweiler for sightseeing.

What to pack for Bad Neuenahr-Ahrweiler in September

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

In September, Bad Neuenahr-Ahrweiler sees daytime highs around 18°C and nights near 10°C. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Bad Neuenahr-Ahrweiler 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 Bad Neuenahr-Ahrweiler 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
Apr5Moderate
May6High
Jun7High
Jul7High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Bad Neuenahr-Ahrweiler 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 Bad Neuenahr-Ahrweiler is worst in April — around 16 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (November, 10 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1316 µg/m³Nov 2310 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb12Good
Mar15Moderate
Apr16Moderate
May14Moderate
Jun14Moderate
Jul12Good
Aug13Moderate
Sep12Moderate
Oct11Good
Nov10Good
Dec10Good
Location & terrain

Where is Bad Neuenahr-Ahrweiler?

Bad Neuenahr-Ahrweiler sits at 50.5°N, 7.1°E, 101 m above sea level, in Germany. The nearest listed city is Remagen, 9.0 km away.

Topography around Bad Neuenahr-Ahrweiler

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Bad Neuenahr-Ahrweiler.

Within 3 km, the terrain around Bad Neuenahr-Ahrweiler has significant variations in elevation — a maximum elevation change of 292 m around an average of 198 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 632 m; within 80 km, large variations in elevation — a maximum elevation change of 1,062 m.

The land around Bad Neuenahr-Ahrweiler is covered by trees (59%) within 3 km, trees (61%) within 16 km, and trees (53%) and grassland (21%) within 80 km.

3 km
292 m
16 km
632 m
80 km
1,062 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Remagen 9.0 km · Sinzig 10 km · Wachtberg 10 km · Meckenheim 11 km · Bad Honnef 14 km · Rheinbach 15 km · Königswinter 16 km · Bonn Hardtberg 18 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 Bad Neuenahr-Ahrweiler (50.5432°, 7.1113°, elevation 101 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).