Mannheim weather in September

In September, Mannheim sees average daytime highs of 20°C and overnight lows near 11°C, with 55 mm of rain across 9.1 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 22°C in the first days to 18°C by the end. The sky is clear or mostly clear about 25% 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 Mannheim's 3rd-clearest and 9th-windiest month. For the whole year in context, see Mannheim's year-round climate.

Daytime high
20°
4th warmest
Overnight low
11°
9th coldest
Rainfall
55 mm
9.1 wet days
Daylight
12 h 24 min
6:10 AM – 6:31 PM
Cloud cover
61%
3rd clearest
Wind
9 km/h
9th windiest
Solar energy
3.34 kWh/m²
Travel score
6.3
out of 10

Mannheim is city in Baden-Württemberg, Germany.

Air quality
Moderate
PM2.5 11.6 µg/m³ · 2019
Density
2,125/km²
people per km²
Founded
~766 CE

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 22°C in the first days to 18°C by the end.

A typical September day in Mannheim reaches about 20°C in the afternoon and slips back to 11°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 26°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)
12313
22213
32213
42213
52213
62213
72212
82112
92112
102112
112112
122112
132112
142111
152011
162011
172011
182011
192011
202011
211911
221910
231910
241910
251910
261810
271810
281810
291810
301810

How September really feels in Mannheim

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.

Mannheim 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 / -0°5911.72.88.40.0
Feb / 5010.12.59.80.5
Mar11° / 5711.2111.52.5
Apr15° / 4410013.44.6
May19° / 10°6711.6015.15.9
Jun23° / 13°5710.70166.6
Jul25° / 15°6210.9015.66.7
Aug25° / 15°539.8014.26.9
Sep20° / 11°559.1012.46.3
Oct15° / 6011.10.110.54.1
Nov / 6211.30.68.91.5
Dec / 7213.92.780.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% 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 59%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24555
34555
44555
54555
64555
74555
84555
94456
104456
114456
124456
134357
144357
154357
164357
174258
184357
194258
204258
214159
224060
233961
243961
253763
263664
273565
283367
293169
303169

Chance of precipitation in September

Any precipitation

Mannheim gets around 55 mm of rain over 9.1 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 32% and peaks near 38% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
128
229
329
429
529
630
730
831
931
1031
1131
1232
1332
1432
1532
1632
1732
1832
1932
2032
2132
2232
2332
2432
2533
2634
2735
2836
2937
3038

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 (%)
164279
266268
367267
468257
570246
670246
772235
872235
973234
1074224
1175214
1275214
1377203
1478193
1578193
1680182
1780182
1881172
1981172
2083161
2183161
2283161
2383161
2484151
2584151
2684151
2784151
2886140
2986140
3086140

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 9 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
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
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 5:47 AM to 6:31 AM, and sunset from 7:05 PM to 6:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:477:05
213.25:497:02
313.25:507:00
413.15:526:58
513.05:536:56
613.05:556:54
712.95:566:51
812.95:586:49
912.85:596:47
1012.76:016:45
1112.76:026:43
1212.66:046:40
1312.66:056:38
1412.56:076:36
1512.46:086:34
1612.46:106:31
1712.36:116:29
1812.26:136:27
1912.26:146:25
2012.16:166:22
2112.06:176:20
2212.06:196:18
2311.96:206:16
2411.96:226:13
2511.86:236:11
2611.76:256:09
2711.76:266:07
2811.66:286:04
2911.56:296:02
3011.56:316:00

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.34 kWh/m².

For context, solar energy here swings from a low near 0.72 kWh/m² to a high of 5.61 kWh/m² in June across the year — September's 3.34 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
133.5Moderate
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
292.7Moderate
302.6Moderate
Planning a trip in September

Is September a good time to visit Mannheim?

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

6.3
Sightseeing
4th-best month of the year
3.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Mannheim for sightseeing.

What to pack for Mannheim in September

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

In September, Mannheim sees daytime highs around 20°C and nights near 11°C. Worth packing: rain gear. About 9 days see rain.

rain gear

UV index in Mannheim 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 Mannheim 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighHighModerateLowJul 15UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr4Moderate
May6High
Jun7High
Jul7Very high
Aug6High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Mannheim 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 Mannheim is worst in April — around 15 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (November, 9 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Mannheim's WHO annual average of 11.6 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1615 µg/m³Nov 229 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb10Good
Mar13Moderate
Apr15Moderate
May13Moderate
Jun14Moderate
Jul12Good
Aug12Good
Sep11Good
Oct10Good
Nov9Good
Dec9Good
Location & terrain

Where is Mannheim?

Mannheim sits at 49.5°N, 8.5°E, 100 m above sea level, in Germany. The nearest listed city is Ludwigshafen am Rhein, 2.0 km away.

Topography around Mannheim

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

Within 3 km, the terrain around Mannheim has only modest variations in elevation — a maximum elevation change of 27 m around an average of 97 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 375 m; within 80 km, large variations in elevation — a maximum elevation change of 836 m.

The land around Mannheim is covered by artificial surfaces (62%) and trees (24%) within 3 km, cropland (36%), trees (26%) and artificial surfaces (24%) within 16 km, and trees (50%) and cropland (25%) within 80 km.

3 km
27 m
16 km
375 m
80 km
836 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Ludwigshafen am Rhein 2.0 km · Gartenstadt 6.0 km · Frankenthal 10 km · Viernheim 10 km · Lampertheim 12 km · Schifferstadt 13 km · Schwetzingen 15 km · Weinheim 16 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 Mannheim (49.4891°, 8.4669°, elevation 100 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).