The temperatures in Rijeka in September are comfortable with low of 13°C and and high up to 21°C.
You can expect rain for roughly half of the month of September in Rijeka. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Rijeka in September 2025.
If you’re planning to visit Rijeka in the near future, we highly recommend that you review the 14 day weather forecast for Rijeka before you arrive.
Temperatures
21° / 13°
Rainy Days
8
Snowy Days
0
Dry Days
22
Rainfall
198
mm
Sun Hours
10.9
Hrs
