Grefrath weather in September

In September, Grefrath sees average daytime highs of 19°C and overnight lows near 11°C, with 64 mm of rain across 10.7 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 8th-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 19% 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 24 min by month's end. Set against the rest of the year, September is Grefrath's 3rd-clearest and 9th-windiest month. For the whole year in context, see Grefrath's year-round climate.

Daytime high
19°
4th warmest
Overnight low
11°
9th coldest
Rainfall
64 mm
10.7 wet days
Daylight
12 h 24 min
6:17 AM – 6:41 PM
Cloud cover
66%
3rd clearest
Wind
12 km/h
9th windiest
Solar energy
3.08 kWh/m²
Travel score
5.9
out of 10

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 Grefrath 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 15°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)
12113
22113
32113
42112
52112
62112
72012
82012
92012
102012
112012
122012
132012
142011
151911
161911
171911
181911
191911
201911
211911
221911
231811
241811
251810
261810
271810
281810
291710
301710

How September really feels in Grefrath

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.

Grefrath weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6612.41.78.20.2
Feb / 5811.42.29.60.6
Mar10° / 5812.10.811.52.3
Apr15° / 4810.7013.54.2
May19° / 10°6111.5015.35.6
Jun21° / 12°7012.1016.36.0
Jul23° / 15°7812.7015.96.4
Aug23° / 14°7712014.46.4
Sep19° / 11°6410.7012.45.9
Oct15° / 6511.4010.44.1
Nov / 6412.40.58.61.8
Dec / 7413.52.17.70.5

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 16% of September, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13367
23466
33565
43565
53664
63565
73565
83565
93664
103664
113664
123664
133664
143763
153763
163763
173862
183862
193862
203862
213763
223763
233763
243664
253664
263565
273565
283367
293268
303169

Chance of precipitation in September

Any precipitation

Grefrath gets around 64 mm of rain over 10.7 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 41% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
136
236
335
435
535
635
736
836
936
1036
1136
1236
1336
1436
1535
1635
1735
1836
1936
2036
2136
2236
2337
2437
2538
2639
2739
2840
2941
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 74% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
16128101
2622891
3652780
4662680
5672670
6672670
7682570
8682570
9702460
10712360
11712360
12722260
13732160
14752050
15752050
16771940
17771940
18781840
19791830
20791830
21801820
22801820
23801820
24801820
25801910
26801910
27801910
28801910
29801910
30811810

Wind in September

Winds average 12 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
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812light breeze
2912light breeze
3012light breeze

Sunrise & sunset in September

DaylightNight

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

Days shrink by about 120 minutes over September. Sunrise moves from 5:53 AM to 6:41 AM, and sunset from 7:16 PM to 6:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:537:16
213.35:547:14
313.35:567:11
413.25:587:09
513.15:597:07
613.16:017:04
713.06:037:02
812.96:047:00
912.96:066:57
1012.86:086:55
1112.76:096:52
1212.76:116:50
1312.66:126:48
1412.56:146:45
1512.56:166:43
1612.46:176:41
1712.36:196:38
1812.36:216:36
1912.26:226:33
2012.16:246:31
2112.16:266:29
2212.06:276:26
2311.96:296:24
2411.86:316:21
2511.86:326:19
2611.76:346:17
2711.66:366:14
2811.66:376:12
2911.56:396:10
3011.46:416:07

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.08 kWh/m².

For context, solar energy here swings from a low near 0.61 kWh/m² to a high of 5.26 kWh/m² in June across the year — September's 3.08 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.6Moderate
33.6Moderate
43.5Moderate
53.5Moderate
63.5Moderate
73.4Moderate
83.4Moderate
93.3Moderate
103.3Moderate
113.3Moderate
123.2Moderate
133.2Moderate
143.1Moderate
153.1Moderate
163.1Moderate
173.0Moderate
183.0Moderate
192.9Moderate
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 Grefrath?

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
2.7
Beach & pool
4th-best month of the year

September is a reasonable time to visit Grefrath for sightseeing.

What to pack for Grefrath in September

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

In September, Grefrath 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 Grefrath 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 Grefrath peaks around July 13 at about 6 (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 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 13UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Grefrath 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 Grefrath is worst in April — around 15 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (December, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1315 µg/m³Dec 129 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb11Good
Mar15Moderate
Apr15Moderate
May14Moderate
Jun13Moderate
Jul12Good
Aug13Moderate
Sep12Good
Oct10Good
Nov10Good
Dec9Good
Location & terrain

Where is Grefrath?

Grefrath sits at 51.3°N, 6.3°E, 38 m above sea level, in Germany. The nearest listed city is Nettetal, 5.0 km away.

Topography around Grefrath

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

Within 3 km, the terrain around Grefrath has only modest variations in elevation — a maximum elevation change of 70 m around an average of 43 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 99 m; within 80 km, large variations in elevation — a maximum elevation change of 893 m.

The land around Grefrath is covered by cropland (44%), trees (23%) and grassland (23%) within 3 km, cropland (37%) and trees (29%) within 16 km, and trees (35%), cropland (29%) and grassland (22%) within 80 km.

3 km
70 m
16 km
99 m
80 km
893 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Nettetal 5.0 km · Kempen 6.0 km · Viersen 10 km · Tönisvorst 11 km · Venlo 13 km · Straelen 13 km · Blerick 14 km · Tegelen 14 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 Grefrath (51.3363°, 6.3407°, elevation 38 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).