Measurements:
°C
°F
CURRENT WEATHER
17:37
Istria
76°F
W 2 mph
Feels like: 80°F
Precip: 19%
World Resorts Croatia Istria Weather

7 Day Weather Forecast

09.11
fri
DAY
74°F
W 6 mph
precip
57%
NIGHT
70°F
SW 4 mph
precip
70%
09.12
sat
DAY
74°F
SE 4 mph
precip
2%
NIGHT
72°F
SW 6 mph
precip
3%
09.13
sun
DAY
76°F
SE 5 mph
precip
3%
NIGHT
72°F
SW 7 mph
precip
17%
09.14
mon
DAY
78°F
NW 3 mph
precip
6%
NIGHT
74°F
SW 8 mph
precip
5%
09.15
tue
DAY
78°F
E 3 mph
precip
3%
NIGHT
76°F
SW 6 mph
precip
5%
09.16
wed
DAY
76°F
SE 3 mph
precip
2%
NIGHT
74°F
W 6 mph
precip
5%
09.17
thu
DAY
80°F
NW 13 mph
precip
36%
NIGHT
70°F
E 10 mph
precip
76%

Istria Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Istria was 23.8°F. The maximum and minimum values were 22.6°F and 24.7°F respectively.

Istria on the Weather Map

Best Time to Visit Istria
The most sunny months:
August 24 days
July 23 days
June 21 days
The most warm months:
August 85.8 °F
July 84.8 °F
June 79.5 °F
Warmest sea temperature:
August 81.4 °F
July 80.6 °F
September 76.2 °F
The most cold months:
January 47.2 °F
February 49.1 °F
December 50.6 °F
The most rainy months:
November 6 days
September 6 days
May 5 days
The most windy months:
February 8 mph
November 8 mph
March 7 mph
more details