September weather forecastRijeka, Croatia
September
Weather in September
Rijeka's September weather typically announces the advent of autumn. The average high temperature begins to cool from the summer peak, and the nights gradually grow colder. Daily sunshine hours start to decrease, yet Rijeka maintains its scenic charm. September also witnesses a rise in rainfall compared to August, with the month recording 157mm (6.18") of precipitation. Despite these changes, the Adriatic sea remains warm, favoring late summer swims.Temperature
In September, the average high-temperature in Rijeka, Croatia, marginally decreases from a moderately hot 28.1°C (82.6°F) in August to a still warm 23.5°C (74.3°F). An average nighttime temperature of 14.9°C (58.8°F) is observed in Rijeka during September.Humidity
In Rijeka, the average relative humidity in September is 63.7%.Rainfall
In Rijeka, in September, during 10.6 rainfall days, 157mm (6.18") of precipitation is typically accumulated. Throughout the year, in Rijeka, there are 130.3 rainfall days, and 1552mm (61.1") of precipitation is accumulated.Snowfall
April through November are months without snowfall in Rijeka, Croatia.Sea temperature
In Rijeka, in September, the average water temperature is 23.4°C (74.1°F).Note: Factoring in a person's dislike for cold, combined with conditions like sunshine, wind, and temperature, a dip in 23.4°C (74.1°F) waters might be satisfying. (It is worth noting that the Olympic swimming waters are maintained between 25°C (77°F) and 28°C (82.4°F).)
Daylight
In Rijeka, the average length of the day in September is 12h and 32min.On the first day of September in Rijeka, Croatia, sunrise is at 06:24 and sunset at 19:39. On the last day of the month, sunrise is at 06:59 and sunset at 18:44 CEST.
Sunshine
In Rijeka, the average sunshine in September is 6.7h.UV index
In Rijeka, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: A maximum UV index of 5 in September translates into the following recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Take caution! The UV rays from the Sun gain strength from sand and water reflections.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rijeka, Croatia
- Average high temperature in September: 23.5°C
The warmest month (with the highest average high temperature) is August (28.1°C).
The month with the lowest average high temperature is January (9.1°C).
- Average low temperature in September: 14.9°C
The months with the highest average low temperature are July and August (18.6°C).
The coldest month (with the lowest average low temperature) is January (2.9°C).
Average humidity in September
Rijeka, Croatia
- Average humidity in September: 63.7%
The month with the highest relative humidity is October (67.4%).
The month with the lowest relative humidity is August (56%).
Average rainfall in September
Rijeka, Croatia
- Average rainfall in September: 156.5mm
The wettest month (with the highest rainfall) is October (203.9mm).
The driest month (with the least rainfall) is July (70.1mm).
Average rainfall days in September
Rijeka, Croatia
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is April (12.6 days).
The month with the least rainy days is February (8.5 days).
Average snowfall days in September
Rijeka, Croatia
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.8 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Rijeka, Croatia
- Average sea temperature in September: 23.4°C
The best month for swimming (with the highest average sea temperature) is August (24.9°C).
The coldest month (with the lowest average sea temperature) is February (10.7°C).
Average daylight in September /
Average sunshine in September
Rijeka, Croatia
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 6h and 42min
The month with the most sunshine is July (Average sunshine: 9h and 36min).
The month with the least sunshine is December (Average sunshine: 3h and 12min).
Average UV index in September
Rijeka, Croatia
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 8).
The months with the lowest UV index are January and December (UV index 1).
