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Pärnu Weather in September
During September, Pärnu experiences moderate daytime temperatures of 18°C (64°F) and cooler nights around 8°C (46°F). Expect quite a bit of rainfall. Around 66 mm (2.6 in) is typical.
Rainfall in Pärnu in September
Typically, about 17 days will experience rainfall, with an average of 66 mm (2.6 in) for the month. Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.
Temperature in Pärnu in September
In September, Pärnu gets moderate temperatures, with highs of 18°C (64°F). Nights cool to around 8°C (46°F). Conditions are often most pleasant around the middle of the day. With lows around 8°C (46°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Pärnu in September
The city usually sees around 175 hours of sunlight, indicating a moderately sunny period.If you prefer dry days with pleasant temperatures, June, 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.
Pärnu Temperature in September
Min Temperature
8°C (46°F)
Max Temperature
18°C (64°F)
Chance of Rain
57%
Precipitation
66 mm (2.6 in)
Rainy days
17 days
Humidity
82% *
Sunshine
175 hours *
Percentage Sunshine
37% *
Pärnu Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Pärnu - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Pärnu typically drop from around 18°C (64°F) at the start of September to approximately 13°C (55°F) by the end. Nights are cool, with lows typically ranging from 6°C (43°F) to 11°C (52°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 Pärnu in September
Browse day-by-day weather records for Pärnu spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Pärnu historical weather extremes in September
According to our 49 years of weather records for Pärnu, the following extremes were recorded between 1976 and 2025.
- Pärnu recorded its highest September temperature of 28°C (82°F) on September 4, 2024.
- On September 16, 1993, Pärnu saw its coldest September day with temperatures maxing out at 5°C (41°F).
- Pärnu registered its coldest September night on September 28, 1986, with temperatures dropping to -3°C (27°F).
Best Places in Estonia in September
Find out more about the weather in Estonia and which places have the best travel conditions in this month. See all of Estonia 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 Pärnu in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Pärnu in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
-
Swimming6/10 -
Cycling6/10 -
Walking6/10 -
Barbeque6/10 -
Camping4/10 -
Outdoor sports10/10
Pärnu 3-Day Forecast
More climate data for Pärnu
Temperature Rainfall Sunshine Humidity
See the full Pärnu climate overview or explore weather in Estonia.
Popular in September
Where to go in September - average daytime high across popular destinations.
Pärnu
18°C (64°F) Tartu
17°C (63°F) Otepää17°C (63°F) Narva-Jõesuu16°C (61°F) Narva17°C (63°F) Haapsalu
16°C (61°F) Tallinn17°C (63°F) Kuressaare17°C (63°F) Bucket list
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