Temperature
Pleasant by day, mild at night.
73°Ftypical September high
Typical range
September climate
September in Opatija
Croatia · Primorje-Gorski Kotar
Warm coastal days and some sun.
Some tradeoffs
Daytime high
73°F
Lows around 63°F
Rain
Several rainy days
Sun
10 h/day
Air feel
Comfortable
Sea temp
74°F
Warm sea
When to visit
Month-by-month fit
Best
Precipitation
Several rainy days. About 12 wet days this month.
38%wet-day frequency
AmountWet-day chance
Sunshine
Plenty of sun this month.
10 hSeptember sunshine
Heat & humidity by month
ComfortableSeptember
Easy airWarm airHot airHumid airVery humid air
Hourly temperature pattern
In September, afternoons feel about 72° and nights feel near 64°.
Very coldColdCoolComfortableWarmNight hours
Clear sky
Partly cloudy skies this month.
50%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
6 mphSeptember Light breeze
Sea temperature
74°FSeptember sea temp
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 73°F, easing to about 70°F in early evening.
Avg temp Typical range
Morning67°F
Rain23%
Cloud49%
Humid airLow
Sun intensityLow
Best windowMidday72°F
Rain26%
Cloud52%
Humid airLow
Sun intensityStrong
Late afternoon73°F
Rain28%
Cloud51%
Humid airModerate
Sun intensityModerate
Early evening69°F
Rain20%
Cloud46%
Humid airModerate
Sun intensityMinimal
Data tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 48 | 40 | 6.0 | 12 | 5.8 | 79 | 55 |
| Feb | 50 | 40 | 5.7 | 11 | 7.3 | 76 | 53 |
| Mar | 55 | 45 | 5.7 | 12 | 9.1 | 74 | 53 |
| Apr | 62 | 51 | 5.2 | 12 | 10.5 | 74 | 57 |
| May | 70 | 59 | 5.5 | 13 | 11.9 | 75 | 65 |
| Jun | 78 | 67 | 3.9 | 10 | 13.0 | 73 | 73 |
| Jul | 82 | 70 | 4.0 | 11 | 13.3 | 72 | 77 |
| Aug | 82 | 70 | 4.5 | 10 | 12.4 | 73 | 78 |
| Sep | 73 | 63 | 8.8 | 12 | 10.0 | 77 | 74 |
| Oct | 65 | 56 | 9.7 | 14 | 8.1 | 81 | 68 |
| Nov | 57 | 49 | 10.7 | 15 | 6.1 | 81 | 64 |
| Dec | 50 | 42 | 7.3 | 12 | 5.4 | 80 | 59 |
Similar climates
Similar
Similar travel styleAlgheroItalySimilar travel styleArcachonFranceSimilar travel styleBarMontenegroSimilar travel styleBiarritzFrance
Want a side-by-side climate view? Compare Opatija with Alghero.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Aug 26, 2026
Data & methodology