Bad Mergentheim weather in September

In September, Bad Mergentheim sees average daytime highs of 19°C and overnight lows near 10°C, with 55 mm of rain across 9.9 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 21°C in the first days to 17°C by the end. The sky is clear or mostly clear about 24% 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 Mergentheim's 4th-clearest and 9th-windiest month. For the whole year in context, see Bad Mergentheim's year-round climate.

Daytime high
19°
4th warmest
Overnight low
10°
9th coldest
Rainfall
55 mm
9.9 wet days
Daylight
12 h 24 min
6:04 AM – 6:26 PM
Cloud cover
63%
4th clearest
Wind
10 km/h
9th windiest
Solar energy
3.33 kWh/m²
Travel score
5.9
out of 10

Bad Mergentheim 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 21°C in the first days to 17°C by the end.

A typical September day in Bad Mergentheim reaches about 19°C in the afternoon and slips back to 10°C overnight — a 9°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 5°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12112
22112
32112
42112
52112
62011
72011
82011
92011
102011
112011
122011
131911
141910
151910
161910
171910
181910
191810
201810
21189
22189
23189
24189
25179
26179
27179
28179
29179
30179

How September really feels in Bad Mergentheim

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 Mergentheim weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°6311.74.58.40.0
Feb / -1°5410.54.39.80.1
Mar / 6211.91.911.51.9
Apr14° / 489.60.313.44.1
May18° / 7412.4015.15.5
Jun22° / 12°6311.80166.2
Jul24° / 14°6612.4015.66.6
Aug24° / 14°5610.4014.26.8
Sep19° / 10°559.9012.45.9
Oct13° / 62110.110.53.6
Nov / 6110.61.68.91.0
Dec / -0°7313.54.880.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24060
34159
44159
54060
63961
74060
84060
94060
103961
114060
124159
134159
144060
154060
164060
174060
184060
194060
204060
213961
223862
233763
243664
253664
263565
273466
283268
293169
303070

Chance of precipitation in September

Any precipitation

Bad Mergentheim gets around 55 mm of rain over 9.9 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 34% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
133
233
333
434
534
634
734
834
934
1034
1134
1234
1334
1434
1533
1633
1733
1833
1932
2032
2132
2232
2333
2433
2533
2634
2735
2836
2936
3037

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 82% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
170246
271236
372235
473225
574224
676213
776213
877212
978202
1078202
1179192
1281181
1381181
1482171
1583161
1684151
1785141
1885141
1986131
2088120
2188120
2289110
2389110
2490100
2590100
2690100
279190
289190
299190
309280

Wind in September

Winds average 10 km/h in September.

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

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 5:42 AM to 6:26 AM, and sunset from 6:59 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:426:59
213.25:436:57
313.25:456:55
413.15:466:53
513.05:486:51
613.05:496:48
712.95:516:46
812.95:526:44
912.85:546:42
1012.75:556:40
1112.75:576:37
1212.65:586:35
1312.66:006:33
1412.56:016:31
1512.46:036:28
1612.46:046:26
1712.36:066:24
1812.26:076:22
1912.26:096:19
2012.16:106:17
2112.06:126:15
2212.06:136:13
2311.96:156:10
2411.96:176:08
2511.86:186:06
2611.76:206:04
2711.76:216:01
2811.66:235:59
2911.56:245:57
3011.56:265:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.33 kWh/m².

For context, solar energy here swings from a low near 0.72 kWh/m² to a high of 5.62 kWh/m² in June across the year — September's 3.33 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
14.0Moderate
23.9Moderate
33.9Moderate
43.8Moderate
53.8Moderate
63.7Moderate
73.7Moderate
83.6Moderate
93.6Moderate
103.6Moderate
113.5Moderate
123.5Moderate
133.4Moderate
143.4Moderate
153.4Moderate
163.3Moderate
173.3Moderate
183.2Moderate
193.2Moderate
203.1Moderate
213.1Moderate
223.0Moderate
233.0Moderate
242.9Moderate
252.9Moderate
262.8Moderate
272.8Moderate
282.7Moderate
292.6Moderate
302.6Moderate
Planning a trip in September

Is September a good time to visit Bad Mergentheim?

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

5.9
Sightseeing
4th-best month of the year
2.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Bad Mergentheim for sightseeing.

What to pack for Bad Mergentheim in September

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

In September, Bad Mergentheim sees daytime highs around 19°C and nights near 10°C. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Bad Mergentheim 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 Mergentheim peaks around July 15 at about 7 (very 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 15UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr4Moderate
May6High
Jun7High
Jul8Very high
Aug6High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Bad Mergentheim 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 Mergentheim is worst in April — around 15 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1515 µg/m³Nov 218 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb10Good
Mar14Moderate
Apr15Moderate
May13Moderate
Jun15Moderate
Jul12Moderate
Aug12Moderate
Sep12Good
Oct10Good
Nov8Good
Dec9Good
Location & terrain

Where is Bad Mergentheim?

Bad Mergentheim sits at 49.5°N, 9.8°E, 211 m above sea level, in Germany. The nearest listed city is Lauda-Königshofen, 9.0 km away.

Topography around Bad Mergentheim

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

Within 3 km, the terrain around Bad Mergentheim has only modest variations in elevation — a maximum elevation change of 195 m around an average of 285 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 312 m; within 80 km, large variations in elevation — a maximum elevation change of 676 m.

The land around Bad Mergentheim is covered by trees (41%) and cropland (26%) within 3 km, cropland (45%) and trees (37%) within 16 km, and trees (46%) and cropland (34%) within 80 km.

3 km
195 m
16 km
312 m
80 km
676 m
treesgrasslandcroplandartificial surfaces
September weather nearby: Lauda-Königshofen 9.0 km · Künzelsau 24 km · Rothenburg ob der Tauber 32 km · Buchen in Odenwald 33 km · Wertheim 35 km · Würzburg 36 km · Öhringen 38 km · Kitzingen 39 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 Mergentheim (49.4925°, 9.7736°, elevation 211 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).