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Diekirch Weather in September
During September, Diekirch experiences pleasant daytime temperatures of 19°C (66°F) and cooler nights around 10°C (50°F). Expect quite a bit of rainfall. Around 69 mm (2.7 in) is typical.
Rainfall in Diekirch in September
Historically, approximately 14 days this month are expected to have rain, averaging 69 mm (2.7 in). The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Diekirch in September
If you're visiting Diekirch in September, expect highs of 19°C (66°F) and overnight lows around 10°C (50°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 10°C (50°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Diekirch in September
The area experiences a moderate amount of sunshine, with approximately 172 hours of sunlight expected. This means a decent mix of sun and overcast.If your ideal day consists of dry skies and pleasant temperatures, June, July and August typically offer the best circumstances for Diekirch.
Diekirch Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
19°C (66°F)
Chance of Rain
47%
Precipitation
69 mm (2.7 in)
Rainy days
14 days
Humidity
76% *
Sunshine
172 hours *
Percentage Sunshine
42% *
* Data from: Luxembourg, Luxembourg (28 KM, 17 Miles).
Diekirch Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Diekirch - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Diekirch typically drop from around 20°C (68°F) at the start of September to approximately 17°C (63°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°F) to 12°C (54°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Diekirch in September
Browse day-by-day weather records for Diekirch spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Diekirch historical weather extremes in September
Based on weather observations in Diekirch between 1976 and 2025, these are the recorded extremes during September.
- The warmest day in September was on September 15, 2020, with a maximum of 33°C (91°F).
- The lowest daytime temperature in September was 9°C (48°F), recorded on September 21, 1977.
- Nighttime temperatures dropped to 0°C (32°F) on September 6, 1993, marking the coldest September night on record.
Best Places in Luxembourg in September
Find out more about the weather in Luxembourg and which places have the best travel conditions in this month. See all of Luxembourg in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Diekirch in September
For Diekirch in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Diekirch in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
-
Swimming6/10 -
Cycling10/10 -
Walking10/10 -
Barbeque7/10 -
Camping4/10 -
Outdoor sports10/10
Diekirch 3-Day Forecast
More climate data for Diekirch
Temperature Rainfall Sunshine Humidity
See the full Diekirch climate overview or explore weather in Luxembourg.
Popular in September
Where to go in September - average daytime high across popular destinations.
Mondorf-les-Bains
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