When to go · Koper
Koper in September
Great month. Inside Koper's best window: May–Jun, Sep–early Oct.
Key facts
- Verdict
- Great
- Temperature
- 25°C (77°F)77°F (25°C) / 16°C (61°F)61°F (16°C)
- average high / low
- Rain days
- 9
- Crowds
- Medium
- Slovenia overall
- Prices
- Medium
- Slovenia overall
Verdict
Inside Koper's best window: May–Jun, Sep–early Oct.
Is another month better than September?
No other month rates higher than September for Koper in this guide.
Weather in September
- KoperHighs around 25 °C (77 °F), lows around 16 °C (61 °F), rain on about 9 daysHighs around 77 °F (25 °C), lows around 61 °F (16 °C), rain on about 9 days
- Karst and coast, Slovenia · Piran, Izola, Koper, Lipicabest weather
Mediterranean; the bora wind blasts the Karst in winter; sea swimming June–September.
Crowds and prices
- Crowds · Slovenia overall
- Medium
- Prices · Slovenia overall
- Medium
Slovenia overall: Best month: warm sea, clear mountains, fewer people.
Compare two months
Weather, crowds and prices for any two months in Koper, side by side.
Verdict
Sep: Great
May: Great
Daytime high
Sep: 25 °C (77 °F)77 °F (25 °C)
May: 23 °C (73 °F)73 °F (23 °C)
Night low
Sep: 16 °C (61 °F)61 °F (16 °C)
May: 13 °C (55 °F)55 °F (13 °C)
Rain days
Sep: 9 (better)
May: 10
Crowds
Sep: Medium
May: Medium
Prices
Sep: Medium
May: Medium
Festivals listed
Sep: 0
May: 0
September: Inside Koper's best window: May–Jun, Sep–early Oct.
May: Inside Koper's best window: May–Jun, Sep–early Oct.
Koper: figures are long-term averages from this guide, not a forecast.
What to pack
Nothing unusual for the weather this month.