| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 9.7° | 3.4° | 131.6mm | 9.5 | 48 |
| February | 10.7° | 3.8° | 130.9mm | 8.3 | 54 |
| March | 13.8° | 6.1° | 112mm | 8.8 | 63 |
| April | 17.8° | 9.5° | 103.5mm | 11.1 | 71 |
| May | 22.5° | 13.6° | 119.2mm | 10.6 | 79 |
| June | 27.3° | 17.7° | 78.3mm | 8.6 | 82 |
| July | 29.9° | 19.8° | 73.4mm | 8.1 | 72 |
| August | 29.9° | 19.8° | 100.2mm | 7.9 | 73 |
| September | 24.3° | 15.6° | 195.7mm | 9.6 | 81 |
| October | 19.6° | 11.9° | 195mm | 11 | 77 |
| November | 14.6° | 8.2° | 210.1mm | 12.9 | 57 |
| December | 11° | 4.7° | 178.3mm | 11 | 49 |
January in Rijeka averages a daily high of 9.7°C with nights around 3.4°C. Expect roughly 9.5 wet days totalling 131.6mm. Demanding conditions — pack for it and plan indoor options.
February in Rijeka averages a daily high of 10.7°C with nights around 3.8°C. Expect roughly 8.3 wet days totalling 130.9mm. Demanding conditions — pack for it and plan indoor options.
March in Rijeka averages a daily high of 13.8°C with nights around 6.1°C. Expect roughly 8.8 wet days totalling 112mm. Generally workable, with some weather to plan around.
April in Rijeka averages a daily high of 17.8°C with nights around 9.5°C. Expect roughly 11.1 wet days totalling 103.5mm. Generally workable, with some weather to plan around.
May in Rijeka averages a daily high of 22.5°C with nights around 13.6°C. Expect roughly 10.6 wet days totalling 119.2mm. Comfortable conditions for being outdoors all day.
June in Rijeka averages a daily high of 27.3°C with nights around 17.7°C. Expect roughly 8.6 wet days totalling 78.3mm. Comfortable conditions for being outdoors all day.
July in Rijeka averages a daily high of 29.9°C with nights around 19.8°C. Expect roughly 8.1 wet days totalling 73.4mm. Generally workable, with some weather to plan around.
August in Rijeka averages a daily high of 29.9°C with nights around 19.8°C. Expect roughly 7.9 wet days totalling 100.2mm. Generally workable, with some weather to plan around.
September in Rijeka averages a daily high of 24.3°C with nights around 15.6°C. Expect roughly 9.6 wet days totalling 195.7mm. Comfortable conditions for being outdoors all day.
October in Rijeka averages a daily high of 19.6°C with nights around 11.9°C. Expect roughly 11 wet days totalling 195mm. Comfortable conditions for being outdoors all day.
November in Rijeka averages a daily high of 14.6°C with nights around 8.2°C. Expect roughly 12.9 wet days totalling 210.1mm. Generally workable, with some weather to plan around.
December in Rijeka averages a daily high of 11°C with nights around 4.7°C. Expect roughly 11 wet days totalling 178.3mm. Demanding conditions — pack for it and plan indoor options.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Rijeka peaks at 82.
Based on 30 years of records, May–June scores highest for comfort in Rijeka, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 29.9°C.
November is the wettest, averaging 210.1mm of rain across roughly 12.9 wet days.
January is the coolest month, with average daily highs around 9.7°C.