When to go · Koper
Koper, month by month
The best months for Koper: May, Jun, Sep, Oct. Months to avoid: Jul, Aug.
Month by month
- JanuaryMixedOutside the best window (May–Jun, Sep–early Oct). Across Slovenia: Ski season at Kranjska Gora and Vogel; Ljubljana foggy and quiet.9 °C (48 °F) / 3 °C (37 °F), 8 rain days48 °F (9 °C) / 37 °F (3 °C), 8 rain daysCrowds: Low
- FebruaryMixedOutside the best window (May–Jun, Sep–early Oct). Across Slovenia: Kurentovanje carnival in Ptuj; ski weeks.10 °C (50 °F) / 3 °C (37 °F), 7 rain days50 °F (10 °C) / 37 °F (3 °C), 7 rain daysCrowds: Low
- MarchMixedOutside the best window (May–Jun, Sep–early Oct). Across Slovenia: Thaw; high passes still closed.14 °C (57 °F) / 6 °C (43 °F), 8 rain days57 °F (14 °C) / 43 °F (6 °C), 8 rain daysCrowds: Low
- AprilGoodOutside the best window (May–Jun, Sep–early Oct). Across Slovenia: Spring in Ljubljana and the Karst; waterfalls full; Vršič may still be shut.18 °C (64 °F) / 9 °C (48 °F), 10 rain days64 °F (18 °C) / 48 °F (9 °C), 10 rain daysCrowds: Medium
- MayGreatInside Koper's best window: May–Jun, Sep–early Oct.23 °C (73 °F) / 13 °C (55 °F), 10 rain days73 °F (23 °C) / 55 °F (13 °C), 10 rain daysCrowds: Medium
- JuneGreatInside Koper's best window: May–Jun, Sep–early Oct.27 °C (81 °F) / 17 °C (63 °F), 10 rain days81 °F (27 °C) / 63 °F (17 °C), 10 rain daysCrowds: High
- JulyAvoidListed as a month to avoid: Jul–Aug (crowds, heat, port traffic).29 °C (84 °F) / 19 °C (66 °F), 8 rain days84 °F (29 °C) / 66 °F (19 °C), 8 rain daysCrowds: High
- AugustAvoidListed as a month to avoid: Jul–Aug (crowds, heat, port traffic).29 °C (84 °F) / 19 °C (66 °F), 8 rain days84 °F (29 °C) / 66 °F (19 °C), 8 rain daysCrowds: High
- SeptemberGreatInside Koper's best window: May–Jun, Sep–early Oct.25 °C (77 °F) / 16 °C (61 °F), 9 rain days77 °F (25 °C) / 61 °F (16 °C), 9 rain daysCrowds: Medium
- OctoberGreatInside Koper's best window: May–Jun, Sep–early Oct.20 °C (68 °F) / 12 °C (54 °F), 10 rain days68 °F (20 °C) / 54 °F (12 °C), 10 rain daysCrowds: Low
- NovemberMixedOutside the best window (May–Jun, Sep–early Oct). Across Slovenia: Wet and grey; St Martin's wine weekend (11 Nov).14 °C (57 °F) / 8 °C (46 °F), 10 rain days57 °F (14 °C) / 46 °F (8 °C), 10 rain daysCrowds: Low
- DecemberMixedOutside the best window (May–Jun, Sep–early Oct). Across Slovenia: Ljubljana's lights and markets; ski season opens.10 °C (50 °F) / 4 °C (39 °F), 9 rain days50 °F (10 °C) / 39 °F (4 °C), 9 rain daysCrowds: Medium · 1 festival or holiday
Compare two months
Weather, crowds and prices for any two months in Koper, side by side.
Verdict
May: Great
Jun: Great
Daytime high
May: 23 °C (73 °F)73 °F (23 °C)
Jun: 27 °C (81 °F)81 °F (27 °C)
Night low
May: 13 °C (55 °F)55 °F (13 °C)
Jun: 17 °C (63 °F)63 °F (17 °C)
Rain days
May: 10
Jun: 10
Crowds
May: Medium
Jun: High
Prices
May: Medium
Jun: Medium
Festivals listed
May: 0
Jun: 0
May: Inside Koper's best window: May–Jun, Sep–early Oct.
June: Inside Koper's best window: May–Jun, Sep–early Oct.
Koper: figures are long-term averages from this guide, not a forecast.