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Mielno Weather in September
September in Mielno averages 19°C (66°F) during the day and 12°C (54°F) at night. Quite a bit of rainfall is typical this month, with around 88 mm (3.5 in) on average. An umbrella is a good idea.
Rainfall in Mielno in September
Analyzing past climate data, one can expect approximately 15 days of rain, averaging 88 mm (3.5 in). Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Mielno in September
Daytime temperatures in Mielno reach 19°C (66°F) in September, dropping to 12°C (54°F) at night. Conditions are often most pleasant around the middle of the day. With lows of 12°C (54°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Mielno in September
The month experiences a moderate amount of sunlight, with 137 hours of sunshine. This provides a nice balance between sunshine and clouds.If your ideal day consists of dry skies and pleasant temperatures, July and August typically offer the best circumstances for Mielno.
Mielno Temperature in September
Min Temperature
12°C (54°F)
Max Temperature
19°C (66°F)
Chance of Rain
49%
Precipitation
88 mm (3.5 in)
Rainy days
15 days
Sunshine
137 hours *
Percentage Sunshine
*
* Data from: Koszalin, Poland (11 KM, 6 Miles).
Mielno Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Mielno - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Mielno typically drop from around 19°C (66°F) at the start of September to approximately 16°C (61°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°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 records for Mielno in September
Browse day-by-day weather records for Mielno spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mielno historical weather extremes in September
Based on weather observations in Mielno between 1976 and 2025, these are the recorded extremes during September.
- The warmest day in September was on September 4, 2024, with a maximum of 31°C (88°F).
- The coldest September day was on September 30, 1995, with a maximum of 8°C (46°F).
- The lowest overnight temperature recorded in September was 1°C (34°F) (September 24, 2002).
- The heaviest September precipitation occurred on September 10, 2019, when 59 mm (2.3 in) of precipitation fell.
Best Places in Poland in September
Find out more about the weather in Poland and which places have the best travel conditions in this month. See all of Poland 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 Mielno in September
For Mielno 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. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Mielno in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming6/10 -
Cycling9/10 -
Walking9/10 -
Camping8/10 -
Outdoor sports9/10
Mielno 3-Day Forecast
More climate data for Mielno
See the full Mielno climate overview or explore weather in Poland.
Popular in September
Where to go in September - average daytime high across popular destinations.
Poznań
20°C (68°F) Kraków
20°C (68°F) Warsaw20°C (68°F) Gdańsk19°C (66°F) Gdynia
18°C (64°F) Sopot19°C (66°F) Kołobrzeg19°C (66°F) Zakopane17°C (63°F) Bucket list
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