Joensuu Weather in September
In Joensuu, September brings moderate daytime temperatures around 14°C (57°F), with nights cooling to 8°C (46°F). Expect quite a bit of rainfall this month.
Rainfall in Joensuu in September
Typically around 17 days of rainfall are expected, averaging 80 mm (3.1 in) for the month. Expect plenty of grey, overcast days rather than intense storms. The rain rarely amounts to much on any given day.
Temperature in Joensuu in September
If you're visiting Joensuu in September, expect highs of 14°C (57°F) and overnight lows around 8°C (46°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. Nights fall to 8°C (46°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in Joensuu in September
You can expect a moderate amount of sunlight, with approximately 110 hours. This means a pleasant mix of sun and overcast.If you prefer enjoying temperate temperatures and rain-free days, July and August typically offer 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 Joensuu's climate page.
Joensuu Temperature in September
Min Temperature
8°C (46°F)
Max Temperature
14°C (57°F)
Chance of Rain
58%
Precipitation
80 mm (3.1 in)
Rainy days
17 days
Sunshine
110 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Joensuu typically drop from around 15°C (59°F) at the start of September to approximately 10°C (50°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 Joensuu in September
Browse day-by-day weather records for Joensuu spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Joensuu historical weather extremes in September
Based on 49 years of weather observations in Joensuu between 1976 and 2025, these are the recorded extremes.
- The warmest day in September was on September 4, 2024, with a maximum of 26°C (79°F).
- The coldest September day was on September 27, 1986, with a maximum of 1°C (34°F).
- Nighttime temperatures dropped to -6°C (21°F) on September 30, 1978, marking the coldest September night on record.
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 Joensuu 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. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Joensuu 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 Joensuu's climate page.
See the full Joensuu climate overview or explore weather in Finland.
