Idar-Oberstein weather in September

In September, Idar-Oberstein sees average daytime highs of 18°C and overnight lows near 10°C, with 61 mm of rain across 9.8 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 20°C in the first days to 16°C by the end. The sky is clear or mostly clear about 21% 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 Idar-Oberstein's 3rd-clearest and 9th-windiest month. For the whole year in context, see Idar-Oberstein's year-round climate.

Daytime high
18°
4th warmest
Overnight low
10°
9th coldest
Rainfall
61 mm
9.8 wet days
Daylight
12 h 24 min
6:14 AM – 6:36 PM
Cloud cover
64%
3rd clearest
Wind
11 km/h
9th windiest
Solar energy
3.23 kWh/m²
Travel score
5.6
out of 10

Idar-Oberstein 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 16°C by the end.

A typical September day in Idar-Oberstein 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)
12011
22011
32011
41911
51911
61911
71911
81911
91910
101910
111910
121810
131810
141810
151810
161810
171810
18189
19179
20179
21179
22179
23179
24179
25169
26169
27169
28169
29169
30168

How September really feels in Idar-Oberstein

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.

Idar-Oberstein 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°6712.44.68.40.0
Feb / -1°5710.34.29.80.1
Mar / 6212.52.311.51.6
Apr13° / 5311.20.513.43.5
May17° / 7112.7015.15.0
Jun20° / 12°6711.80165.9
Jul23° / 13°6712.5015.76.4
Aug22° / 13°6311.2014.26.5
Sep18° / 10°619.8012.45.6
Oct13° / 6311.60.110.53.2
Nov / 6512.11.48.80.8
Dec / 8113.64.480.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24159
34060
44159
54159
64060
74060
83961
93961
103862
113961
123763
133763
143763
153763
163664
173664
183664
193664
203664
213565
223565
233466
243466
253268
263169
273070
282971
292773
302674

Chance of precipitation in September

Any precipitation

Idar-Oberstein gets around 61 mm of rain over 9.8 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 41% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
131
231
331
431
531
632
732
833
933
1034
1134
1234
1334
1434
1534
1634
1734
1834
1934
2034
2134
2234
2335
2435
2536
2637
2738
2839
2940
3041

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 84% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
173225
275214
375214
476213
576213
677212
778202
878202
979201
1079201
1180191
1281181
1381181
1482171
1583161
1684151
1786140
1886140
1987130
2088120
2189110
2289110
2390100
2490100
259190
269190
279190
289280
299280
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 11 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
2911calm
3011calm

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 6:36 AM, and sunset from 7:10 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:517:10
213.25:537:07
313.25:547:05
413.15:567:03
513.15:577:01
613.05:596:59
712.96:006:56
812.96:026:54
912.86:036:52
1012.76:056:50
1112.76:076:47
1212.66:086:45
1312.66:106:43
1412.56:116:41
1512.46:136:38
1612.46:146:36
1712.36:166:34
1812.26:176:31
1912.26:196:29
2012.16:206:27
2112.06:226:25
2212.06:236:22
2311.96:256:20
2411.96:266:18
2511.86:286:16
2611.76:306:13
2711.76:316:11
2811.66:336:09
2911.56:346:07
3011.56:366:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.23 kWh/m².

For context, solar energy here swings from a low near 0.67 kWh/m² to a high of 5.52 kWh/m² in June across the year — September's 3.23 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.8Moderate
33.8Moderate
43.7Moderate
53.7Moderate
63.6Moderate
73.6Moderate
83.5Moderate
93.5Moderate
103.5Moderate
113.4Moderate
123.4Moderate
133.4Moderate
143.3Moderate
153.3Moderate
163.2Moderate
173.2Moderate
183.1Moderate
193.1Moderate
203.0Moderate
213.0Moderate
222.9Moderate
232.9Moderate
242.8Moderate
252.8Moderate
262.7Moderate
272.7Moderate
282.6Moderate
292.5Moderate
302.5Moderate
Planning a trip in September

Is September a good time to visit Idar-Oberstein?

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
1.8
Beach & pool
4th-best month of the year

September is a reasonable time to visit Idar-Oberstein for sightseeing.

What to pack for Idar-Oberstein in September

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

In September, Idar-Oberstein 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 Idar-Oberstein 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 Idar-Oberstein peaks around July 16 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 16UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun7High
Jul8Very high
Aug7High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Idar-Oberstein 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 Idar-Oberstein is worst in April — around 15 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (November, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1515 µg/m³Nov 239 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar14Moderate
Apr15Moderate
May13Moderate
Jun14Moderate
Jul12Good
Aug12Good
Sep11Good
Oct10Good
Nov9Good
Dec9Good
Location & terrain

Where is Idar-Oberstein?

Idar-Oberstein sits at 49.7°N, 7.3°E, 288 m above sea level, in Germany. The nearest listed city is Sankt Wendel, 29 km away.

Topography around Idar-Oberstein

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

Within 3 km, the terrain around Idar-Oberstein has significant variations in elevation — a maximum elevation change of 269 m around an average of 375 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 641 m; within 80 km, large variations in elevation — a maximum elevation change of 768 m.

The land around Idar-Oberstein is covered by trees (70%) within 3 km, trees (66%) and grassland (21%) within 16 km, and trees (54%) and cropland (20%) within 80 km.

3 km
269 m
16 km
641 m
80 km
768 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Sankt Wendel 29 km · Wadern 36 km · Schiffweiler 41 km · Bexbach 41 km · Neunkirchen 42 km · Illingen 42 km · Wittlich 42 km · Bad Kreuznach 43 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 Idar-Oberstein (49.7144°, 7.3078°, elevation 288 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).