Sundsvall Weather in September
Sundsvall in September sees moderate daytime temperatures of 16°C (61°F) and nighttime lows of 6°C (43°F). Rainfall is fairly high this month at around 61 mm (2.4 in), so pack a rain jacket to stay dry.
Rainfall in Sundsvall in September
You can expect rain on roughly 15 days based on historical data, averaging 61 mm (2.4 in) for the month. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Sundsvall in September
September in Sundsvall brings typical temperatures with highs around 16°C (61°F) and lows of 6°C (43°F). The difference between afternoon and evening temperatures is usually noticeable. Nights drop to 6°C (43°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Sundsvall in September
The area enjoys a balanced 144 hours of sunlight, ensuring it's neither too overcast nor too sunny.Should you favor a climate that's both dry and comfortably warm, July and August typically offer the most agreeable 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 Sweden, check out our Sundsvall's climate page.
Sundsvall Temperature in September
Min Temperature
6°C (43°F)
Max Temperature
16°C (61°F)
Chance of Rain
50%
Precipitation
61 mm (2.4 in)
Rainy days
15 days
Sunshine
144 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Sundsvall typically drop from around 16°C (61°F) at the start of September to approximately 12°C (54°F) by the end. Nights are cold, with lows typically ranging from 3°C (37°F) to 8°C (46°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 for Sundsvall in September
Browse day-by-day weather records for Sundsvall spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sundsvall historical weather extremes in September
The extremes listed below come from historical weather data collected in Sundsvall from 1976 through 2025.
- The hottest September day on record in Sundsvall reached 26°C (79°F) (September 3, 1999).
- The lowest daytime temperature in September was 5°C (41°F), recorded on September 25, 1986.
- Sundsvall registered its coldest September night on September 30, 1976, with temperatures dropping to -7°C (19°F).
Best Places in Sweden in September
Find out more about the weather in Sweden and which places have the best travel conditions in this month. See all of Sweden in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Sundsvall in September
Pack for changing conditions in Sundsvall in September. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Rain gear is recommended, you can expect wet weather on multiple days. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Sundsvall 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 Sweden, check out our Sundsvall's climate page.
See the full Sundsvall climate overview or explore weather in Sweden.
