5-day weather forecast Grožnjan Sep 22, 2026
21°Weather forecast Grožnjan tomorrow Sep 22, 2026: sunny, temperature from 17 °C to 21 °C.
Precipitation probability 15%. Wind up to 6.61 m/s (gusts 7.92 m/s). Air humidity 46–61%, atmospheric pressure 765–768 mm Hg, UV index up to 4.6.
Weather Alerts
Moderate Wind Warning (Degree 2/4) - Slovenia / South-West
Moderate Wind Warning
Maximum wind speed : from 50 to 70 km/h. Wind sways trees and may break branches. It impedes road traffic of certain categories and may hinder movement to some extent. The sea is fairly rough (3).
Before the event:
Close all windows and doors. Stow or fasten anything that could be carried away by the wind. Check the situation of vessels in berths.
During the event:
Doors and windows should be kept closed. When moving in the open, pay attention to possible falling objects. Stop all work at heights. Do not repair damage during the event. We recommend additional caution in traffic, especially in crosswinds and in exposed areas (e.g. bridges, cuttings). Caution is recommended in water sports. Less skilled sailors should not sail out. Swimmers should stay close to the shore.
Yellow wind warning
Fresh, locally strong NE wind. Maximum wind gusts 35-45 knots (65-85 km/h)
IMPACT: Although rather usual in this region, locally or potentially dangerous wind speeds are expected to produce dangerous wave conditions to small crafts. Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in these conditions.
Mariners should pay close attention to the marine forecast and consider wind and sea conditions in planning. It is possible that some ferry lines will not operate so follow traffic information if travelling.
Yellow wind warning
NE wind increasing to near gale force. Maximum wind gusts 35-55 knots (65-100 km/h)
IMPACT: Although rather usual in this region, locally or potentially dangerous wind speeds are expected to produce dangerous wave conditions to small crafts. Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in these conditions.
Mariners should pay close attention to the marine forecast and consider wind and sea conditions in planning. It is possible that some ferry lines will not operate so follow traffic information if travelling.
Yellow wind warning
Fresh, locally strong NE wind. Maximum wind gusts 35-45 knots (65-85 km/h)
IMPACT: Although rather usual in this region, locally or potentially dangerous wind speeds are expected to produce dangerous wave conditions to small crafts. Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in these conditions.
Mariners should pay close attention to the marine forecast and consider wind and sea conditions in planning. It is possible that some ferry lines will not operate so follow traffic information if travelling.
Orange wind warning
Strong, locally gale NE wind. Maximum wind gusts 35-65 knots (65-120 km/h)
IMPACT: Be prepared for gale and strong gale wind speeds combined with locally high waves that are imminent or occurring. Operating a vessel in these conditions requires experience and properly equipped vessels.
It is highly recommended that mariners without the proper experience seek safe harbor prior to onset of potentially dangerous wind and wave conditions. It is likely that many ferries will not operate so follow traffic information if travelling.
5 days at a glance — tap a day to open it
Sunrise 06:52
Sunset 19:03
Sunset 19:03
Waxing Gibbous89% illuminated
Moonrise 17:27 · Moonset 02:17
Moonrise 17:27 · Moonset 02:17
Chart
Table
| Time | Weather | Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index |
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Overcast | 19 °C | 15% | 100% | 61% | 765 mm Hg | ENE 71° 3.89 (4.42) m/s | 0 |
| 01:00 | Overcast | 19 °C | 14% | 100% | 59% | 765 mm Hg | E 81° 3.61 (4.42) m/s | 0 |
| 02:00 |  Clear | 18 °C | 3% | 5% | 58% | 766 mm Hg | ENE 71° 3.89 (4.61) m/s | 0 |
| 03:00 |  Partly cloudy | 18 °C | 5% | 32% | 56% | 765 mm Hg | ENE 70° 3.5 (4.03) m/s | 0 |
| 04:00 | Overcast | 17 °C | 13% | 98% | 55% | 765 mm Hg | ENE 64° 3.31 (3.72) m/s | 0 |
| 05:00 | Partly cloudy | 17 °C | 6% | 47% | 55% | 765 mm Hg | ENE 77° 3.11 (3.64) m/s | 0 |
| 06:00 | Overcast | 17 °C | 13% | 100% | 53% | 765 mm Hg | ENE 75° 2.81 (3.22) m/s | 0 |
| 07:00 |  Overcast | 17 °C | 12% | 100% | 52% | 765 mm Hg | ENE 69° 2.19 (2.22) m/s | 0 |
| 08:00 |  Cloudy | 17 °C | 8% | 72% | 52% | 766 mm Hg | ENE 71° 1.5 (5.5) m/s | 0.2 |
| 09:00 |  Partly cloudy | 18 °C | 5% | 47% | 50% | 766 mm Hg | E 84° 1 (6) m/s | 0.8 |
| 10:00 | Cloudy | 18 °C | 9% | 82% | 48% | 767 mm Hg | E 84° 0.61 (0.61) m/s | 1.8 |
| 11:00 | Overcast | 19 °C | 9% | 88% | 46% | 767 mm Hg | NNE 33° 0.69 (0.72) m/s | 3.1 |
| 12:00 | Partly cloudy | 19 °C | 4% | 45% | 46% | 767 mm Hg | N 350° 1 (1.22) m/s | 4.1 |
| 13:00 | Sunny | 20 °C | 2% | 9% | 47% | 767 mm Hg | NW 318° 1.61 (1.72) m/s | 4.6 |
| 14:00 | Sunny | 20 °C | 2% | 4% | 50% | 767 mm Hg | WNW 299° 2.5 (6.5) m/s | 4.2 |
| 15:00 | Sunny | 20 °C | 2% | 0% | 52% | 766 mm Hg | WNW 297° 3.11 (6.11) m/s | 3.3 |
| 16:00 | Sunny | 20 °C | 2% | 1% | 52% | 766 mm Hg | WNW 287° 2.81 (6.81) m/s | 2.1 |
| 17:00 | Sunny | 21 °C | 2% | 0% | 51% | 766 mm Hg | WNW 289° 2.5 (6.5) m/s | 1 |
| 18:00 | Sunny | 21 °C | 2% | 0% | 50% | 766 mm Hg | NW 315° 1.69 (5.69) m/s | 0.3 |
| 19:00 | Sunny | 21 °C | 2% | 0% | 49% | 766 mm Hg | NNW 347° 1.11 (4.11) m/s | 0 |
| 20:00 | Clear | 20 °C | 2% | 3% | 48% | 767 mm Hg | ENE 70° 0.81 (1.36) m/s | 0 |
| 21:00 | Clear | 20 °C | 2% | 0% | 50% | 767 mm Hg | ESE 120° 4.31 (6.61) m/s | 0 |
| 22:00 | Clear | 19 °C | 3% | 0% | 57% | 768 mm Hg | ESE 117° 6.61 (7.92) m/s | 0 |
| 23:00 | Clear | 18 °C | 3% | 0% | 58% | 768 mm Hg | ESE 106° 5.89 (7.11) m/s | 0 |
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.