5-day weather forecast Grožnjan Sep 27, 2026

21°17° · Sunny

Weather forecast Grožnjan Sunday Sep 27, 2026: sunny, temperature from 17 °C to 21 °C.

Precipitation probability 14%. Wind up to 2.81 m/s (gusts 7.19 m/s). Air humidity 50–66%, atmospheric pressure 764–766 mm Hg, UV index up to 4.5.

Weather Alerts

ModerateSep 23, 08:48 AM — Sep 24, 11:59 PMTranslate with Google

Moderate Thunderstorms Warning (Degree 2/4) - Slovenia / South-West

Moderate Thunderstorms Warning

Thunderstorms are possible, accompanied by local intense precipitation and gusty winds. Intense local showers with wind blasts and lightning strikes are possible. Torrential watercourses may rise quickly. Rainwater floods are possible.

Beware of approaching storm clouds. Do not linger in exposed locations, e.g. under trees or power lines. Wait in a safe place, as storms usually do not last long.

ModerateSep 24, 07:15 AM — Sep 24, 11:59 PMTranslate with Google

Moderate Thunderstorms Warning (Degree 2/4) - Slovenia / South-West

Moderate Thunderstorms Warning

Beware of approaching storm clouds. Do not linger in exposed locations, e.g. under trees or power lines. Wait in a safe place, as storms usually do not last long.

ModerateSep 23, 08:40 AM — Sep 25, 11:59 AMTranslate with Google

Yellow thunderstorm warning

Severe thundershowers locally.

STAY ALERT for possible heavy thunderstorms. Be especially careful in high-exposure areas such as mountains, forests, meadows and open grounds. Interruptions in outdoor activities are possible.

ModerateSep 24, 08:16 AM — Sep 25, 08:59 AMTranslate with Google

Yellow thunderstorm warning

Severe thundershowers locally.

STAY ALERT for possible heavy thunderstorms. Be especially careful in high-exposure areas such as mountains, forests, meadows and open grounds. Interruptions in outdoor activities are possible.

ModerateSep 24, 07:40 AM — Sep 25, 01:59 PMTranslate with Google

Yellow wind warning

Strong bura (NE wind) with gale force gusts.

STAY ALERT for debris carried by strong winds. Debris and tree branches carried by the wind may cause localised interruptions in outdoor activities.

5 days at a glance — tap a day to open it

Sunrise 06:58
Sunset 18:53

Waning Gibbous96% illuminated
Moonrise 18:54 · Moonset 07:47

Chart

Table

← Sat, Sep 26

Sun, Sep 27, 2026

Mon, Sep 28 →

Forecast from 17 °C to 21 °C and precipitation

Temperature & Precipitation
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Temperature (°C)	18	18	18	18	18	17	17	17	17	18	19	19	20	20	20	20	20	21	21	20	20	20	20	19
Precipitation (mm/hr)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Cloud cover (%)	58	84	66	11	14	8	5	5	5	5	5	5	4	0	0	0	0	0	0	0	0	0	0	0
Rain chance (%)	10	14	11	5	5	4	4	4	4	3	2	2	2	2	2	3	2	2	2	3	3	3	3	4

Wind speed and direction

Wind & Wind gust
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Wind (m/s)	2.81	2.61	2.69	2.69	2.5	2.69	2.61	2.61	2.39	2	1.61	1.39	2.19	2.61	2.5	2.11	1.69	1.39	1	0.5	0.61	1.61	2	2
Wind gust (m/s)	2.92	2.72	2.92	2.83	2.72	2.72	2.64	2.61	2.42	2.11	1.81	1.39	7.19	5.61	6.5	6.11	5.69	5.39	5	0.61	3.61	5.61	6	6
Wind direction (°)	NE 45°	NE 41°	NE 37°	NE 36°	NE 36°	NE 36°	NE 36°	NE 36°	NE 42°	NE 35°	NNE 16°	NNW 335°	NW 311°	NW 308°	WNW 303°	WNW 296°	WNW 292°	WNW 283°	W 277°	WNW 287°	NE 42°	ENE 68°	E 79°	E 87°

Air humidity

Humidity
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Humidity (%)	66	66	66	65	64	63	61	60	59	56	52	50	51	53	54	54	54	54	54	55	55	57	59	61

Atmospheric pressure

Pressure
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Pressure (mm Hg)	766	766	766	765	765	765	765	765	765	765	766	766	766	765	765	765	764	764	764	764	765	765	765	765

Ultraviolet index

UV Index
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
UV Index	0	0	0	0	0	0	0	0	0.2	0.7	1.8	3	4.1	4.5	4.2	3.3	2	0.9	0.2	0	0	0	0	0

Air quality & pollen

Air quality is available for the first three days only.

← Sat, Sep 26

Sun, Sep 27, 2026

Mon, Sep 28 →

Grožnjan on the map

Data Sources & Methodology

Our weather forecasts are powered by a professional weather data provider that aggregates data from national weather services, satellite observations, radar networks, and over 80,000 weather stations worldwide. Forecast data is updated multiple times daily. We convert raw data into clear summaries — wind speed in m/s, pressure in mmHg — so you can plan your day with confidence.

Learn more about our methodology →