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Gränna Weather in September
Gränna in September averages 16°C (61°F) during the day and 9°C (48°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Gränna in September
The climate data from previous years indicates about 15 days of rain, averaging 70 mm (2.8 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 Gränna in September
Daytime temperatures in Gränna reach 16°C (61°F) in September, dropping to 9°C (48°F) at night. Conditions are often most pleasant around the middle of the day. With overnight lows of 9°C (48°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Gränna in September
You can expect a moderate amount of sunlight, with approximately 132 hours. This means a pleasant mix of sun and overcast.For Gränna 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.
Gränna Temperature in September
Min Temperature
9°C (48°F)
Max Temperature
16°C (61°F)
Chance of Rain
50%
Precipitation
70 mm (2.8 in)
Rainy days
15 days
Humidity
80% *
Sunshine
132 hours *
Percentage Sunshine
32% *
* Data from: Jönköping, Sweden (32 KM, 20 Miles).
Gränna Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Gränna - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Gränna typically drop from around 17°C (63°F) at the start of September to approximately 13°C (55°F) by the end. Nights are cold, with lows typically ranging from 5°C (41°F) to 10°C (50°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 Gränna in September
Browse day-by-day weather records for Gränna spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Gränna historical weather extremes in September
Based on 50 years of weather observations in Gränna between 1976 and 2026, these are the recorded extremes.
- On September 4, 2024, temperatures climbed to 28°C (82°F), marking the warmest September day on record.
- Gränna experienced its chilliest September day on September 30, 1995, reaching only 3°C (37°F).
- The lowest overnight temperature recorded in September was -7°C (19°F) (September 27, 1986).
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
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 Gränna in September
For Gränna 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. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.
What To Do in Gränna in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming5/10 -
Cycling6/10 -
Walking6/10 -
Camping4/10 -
Outdoor sports10/10
Gränna 3-Day Forecast
More climate data for Gränna
Temperature Rainfall Sunshine Humidity
See the full Gränna climate overview or explore weather in Sweden.
Popular in September
Where to go in September - average daytime high across popular destinations.
Lund
18°C (64°F) Malmö19°C (66°F) Gothenburg
18°C (64°F) Karlskrona17°C (63°F) Falkenberg18°C (64°F) Simrishamn17°C (63°F) Stockholm17°C (63°F) Visby
17°C (63°F) Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
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