September weather - Autumn 2024

Weather in September
Frequently asked questions
Average temperature in September
Average humidity in September
Average rainfall in September
Average rainfall days in September
Average snowfall days in September
Average sea temperature in September
Average daylight in September
Average sunshine in September
Average UV index in September

The ancient city of Rovinj, Croatia, beautifully surrounded by water

Weather in September

September in Rovinj marks the start of the fall season, bringing with it a steady decline in temperature after the hot summer months. The city returns to its regular rhythm, with temperatures cooling down from August's peaks. The sea remains warm, perfect for late-season swimmers or those who enjoy a less crowded coastline. Changes in the weather pattern become noticeable towards the end of the month, setting the stage for the transition into October's cooler climes.

Temperature

September's onset brings a negligible change in high-temperatures, falling from a moderately hot 28.7°C (83.7°F) in August to a still warm 24.6°C (76.3°F). During September, Rovinj records an average temperature of 14°C (57.2°F) at night.

Humidity

In Rovinj, the average relative humidity in September is 76.3%.

Rainfall

In Rovinj, during September, the rain falls for 7.9 days and regularly aggregates up to 83mm (3.27") of precipitation. In Rovinj, during the entire year, the rain falls for 102.1 days and collects up to 811mm (31.93") of precipitation.

Snowfall

In Rovinj, Croatia, snow does not fall in April through December.

Sea temperature

In Rovinj, the average seawater temperature in September is 23.7°C (74.7°F).
Note: Think about diving into 23.7°C (74.7°F) waters. Factors like your sensitivity to cold, the brightness of the sun, wind conditions, and the day's warmth play a role. For reference, Olympic swimming competitions use waters between 25°C (77°F) and 28°C (82.4°F).

Daylight

In Rovinj, the average length of the day in September is 12h and 32min.
On the first day of the month, sunrise is at 06:27 and sunset at 19:42. On the last day of September, sunrise is at 07:02 and sunset at 18:47 CEST.

Sunshine

In September, the average sunshine in Rovinj is 7.7h.

UV index

In September, the average daily maximum UV index in Rovinj is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum UV index of 5 in September translates into the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Attention! UV radiation is markedly stronger with water and sand reflections.

Updated: Jan 24, 2024 | Published by: Weather Atlas | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What is the usual temperature for Rovinj in September?

The high-temperature, in September, in Rovinj, is 24.6°C (76.3°F), while the low-temperature averages to 14°C (57.2°F). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in August is evaluated at 32°C (89.6°F).

What is the average humidity in September in Rovinj?

In September, the average relative humidity in Rovinj, Croatia, is 76.3%.

How much does it rain in Rovinj in September?

In Rovinj, during September, the rain falls for 7.9 days and regularly aggregates up to 83mm (3.27") of precipitation.

When it does not snow in Rovinj?

April through December are months without snowfall.

How warm is the water in September in Rovinj?

In Rovinj, the average seawater temperature in September is 23.7°C (74.7°F). For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 23.7°C (74.7°F).

How many hours of daylight does Rovinj have in September?

In Rovinj, the average day length in September is 12h and 32min.

When are sunrise and sunset in September in Rovinj?

On the first day of September in Rovinj, Croatia, sunrise is at 06:27 and sunset at 19:42. On the last day of the month, sunrise is at 07:02 and sunset at 18:47 CEST.

How long on average sun shines in September in Rovinj?

In September, the average sunshine duration in Rovinj, Croatia, is 7.7h.

How high is the UV index in September in Rovinj?

In Rovinj, Croatia, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

28.7°C 83.7°F

24.6°C 76.3°F

19.9°C 67.8°F

Average low temperature

Average humidity

Average rainfall

Average rainfall days

6.6

7.9

9.8

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average UV index

Average temperature in September
Rovinj, Croatia

Average high temperature in September: 24.6°C

The warmest month (with the highest average high temperature) is August (28.7°C).
The month with the lowest average high temperature is January (9.6°C).

Average low temperature in September: 14°C

The months with the highest average low temperature are July and August (17.2°C).
The coldest month (with the lowest average low temperature) is February (1.6°C).

Average humidity in September
Rovinj, Croatia

Average humidity in September: 76.3%

The month with the highest relative humidity is January (82.1%).
The month with the lowest relative humidity is July (67.7%).

Average rainfall in September
Rovinj, Croatia

Average rainfall in September: 83.1mm

The wettest month (with the highest rainfall) is November (98.3mm).
The driest month (with the least rainfall) is July (40.7mm).

Average rainfall days in September
Rovinj, Croatia

Average rainfall days in September: 7.9 days

The month with the highest number of rainy days is April (10.5 days).
The month with the least rainy days is July (5.8 days).

Average snowfall days in September
Rovinj, Croatia

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).

Average sea temperature in September
Rovinj, Croatia

Average sea temperature in September: 23.7°C

The best month for swimming (with the highest average sea temperature) is August (25.2°C).
The coldest month (with the lowest average sea temperature) is February (9.8°C).

Average daylight in September /
Average sunshine in September
Rovinj, Croatia

Average daylight in September: 12h and 3min

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: 7h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 3h and 0min).

Average UV index in September
Rovinj, 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).

September weather forecast
Rovinj, Croatia

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