Karlskrona Weather in September
Karlskrona in September averages 17°C (63°F) during the day and 12°C (54°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Karlskrona in September
Typically, you can expect about 14 days of rain this month, with 61 mm (2.4 in) on average. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Karlskrona in September
If you're visiting Karlskrona in September, expect highs of 17°C (63°F) and overnight lows around 12°C (54°F). Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With overnight lows of 12°C (54°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Karlskrona in September
The month brings about 183 hours of sunlight, offering a comfortable mix of sun and overcast.For Karlskrona itself, 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 Sweden, check out our Karlskrona's climate page.
Karlskrona Temperature in September
Min Temperature
12°C (54°F)
Max Temperature
17°C (63°F)
Chance of Rain
45%
Precipitation
61 mm (2.4 in)
Rainy days
14 days
Humidity
81% *
Sunshine
183 hours *
Percentage Sunshine
48% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Karlskrona typically drop from around 18°C (64°F) at the start of September to approximately 14°C (57°F) by the end. Nights are cool, with lows typically ranging from 8°C (46°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 for Karlskrona in September
Browse day-by-day weather records for Karlskrona spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Karlskrona historical weather extremes in September
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Karlskrona.
- On September 10, 2023, temperatures climbed to 27°C (81°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 9°C (48°F), recorded on September 26, 1990.
- Nighttime temperatures dropped to -1°C (30°F) on September 30, 2024, marking the coldest September night on record.
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 Karlskrona in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Karlskrona 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 Karlskrona's climate page.
Temperature Rainfall Sunshine Humidity
See the full Karlskrona climate overview or explore weather in Sweden.
