Lahti Weather in September
Lahti in September sees moderate daytime temperatures of 16°C (61°F) and nighttime lows of 8°C (46°F). Moderate rainfall is typical, with around 59 mm (2.3 in) for the month.
Rainfall in Lahti in September
Based on our climate data of the past 30 years, about 17 days of rain are anticipated, with 59 mm (2.3 in) on average. Expect plenty of grey, overcast days rather than intense storms. The rain rarely amounts to much on any given day.
Temperature in Lahti in September
September in Lahti brings typical temperatures with highs around 16°C (61°F) and lows of 8°C (46°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. With overnight lows of 8°C (46°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.For Lahti itself, June, July and August generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Finland, check out our Lahti's climate page.
Lahti Temperature in September
Min Temperature
8°C (46°F)
Max Temperature
16°C (61°F)
Chance of Rain
58%
Precipitation
59 mm (2.3 in)
Rainy days
17 days
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Lahti typically drop from around 17°C (63°F) at the start of September to approximately 11°C (52°F) by the end. Nights are cold, with lows typically ranging from 4°C (39°F) to 9°C (48°F).
Average temperatures in September
Historical weather for Lahti in September
Browse day-by-day weather records for Lahti spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Lahti historical weather extremes in September
Based on 49 years of weather observations in Lahti between 1976 and 2025, these are the recorded extremes.
- Lahti recorded its highest September temperature of 27°C (81°F) on September 5, 2024.
- On September 23, 2014, Lahti saw its coldest September day with temperatures maxing out at 3°C (37°F).
- Lahti registered its coldest September night on September 30, 1993, with temperatures dropping to -7°C (19°F).
Best Places in Finland in September
Find out more about the weather in Finland and which places have the best travel conditions in this month. See all of Finland in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Lahti in September
The weather can be unpredictable in September, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. Rain is likely on several days, so bring a good rain jacket.What To Do in Lahti in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Finland, check out our Lahti's climate page.
See the full Lahti climate overview or explore weather in Finland.
