Käsmu Weather in September
Käsmu in September sees moderate daytime temperatures of 16°C (61°F) and nighttime lows of 11°C (52°F). Rainfall is fairly high this month at around 76 mm (3 in), so pack a rain jacket to stay dry.
Rainfall in Käsmu in September
Rain is expected on roughly 16 days, totalling around 76 mm (3 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 Käsmu in September
September in Käsmu brings typical temperatures with highs around 16°C (61°F) and lows of 11°C (52°F). Conditions are often most pleasant around the middle of the day. Nights drop to around 11°C (52°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in Käsmu in September
The area experiences a moderate amount of sunshine, with approximately 163 hours of sunlight expected. This means a decent mix of sun and overcast.If you prefer enjoying temperate temperatures and rain-free days, 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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Estonia, check out our Käsmu's climate page.
Käsmu Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
16°C (61°F)
Chance of Rain
53%
Precipitation
76 mm (3 in)
Rainy days
16 days
Humidity
82% *
Sunshine
163 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Käsmu typically drop from around 17°C (63°F) at the start of September to approximately 12°C (54°F) by the end. Nights are cool, with lows typically ranging from 7°C (45°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 for Käsmu in September
Browse day-by-day weather records for Käsmu spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Käsmu historical weather extremes in September
The extremes listed below come from historical weather data collected in Käsmu from 1976 through 2025.
- The hottest September day on record in Käsmu reached 26°C (79°F) (September 8, 2025).
- The lowest daytime temperature in September was 5°C (41°F), recorded on September 27, 1986.
- Käsmu registered its coldest September night on September 30, 1980, 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
What to Wear in Käsmu 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. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Käsmu 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 Estonia, check out our Käsmu's climate page.
Temperature Rainfall Sunshine Humidity
See the full Käsmu climate overview or explore weather in Estonia.
