5-day weather forecast Grožnjan Sep 21, 2026
23°Weather forecast Grožnjan today Sep 21, 2026: overcast, temperature from 20 °C to 25 °C.
Precipitation probability 23%. Wind up to 5.31 m/s (gusts 7.89 m/s). Air humidity 60–80%, atmospheric pressure 764–767 mm Hg, UV index up to 4.3.
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 06:51
Sunset 19:05
Sunset 19:05
Waxing Gibbous82% illuminated
Moonrise 17:04 · Moonset 01:11
Moonrise 17:04 · Moonset 01:11
Chart
TableMon, Sep 21, 2026
Forecast from 20 °C to 25 °C and precipitation
Cloud cover and precipitation probability
Wind speed and direction
Air humidity
Atmospheric pressure
Ultraviolet index
Air quality & pollen
Mon, Sep 21, 2026
Frequently asked questions about the 5-day weather in Grožnjan
What will the weather be like in Grožnjan over the next 5 days?
Over the next 5 days in Grožnjan the temperature is expected to range from about 16 to 25 °C. See the detailed hourly forecast for each of the 5 days in the charts above.
On which of the next 5 days will it rain in Grožnjan?
The chance of rain in Grožnjan over the next 5 days reaches 58%. Check the 5-day precipitation chart above to see exactly which days and hours bring rain.
How accurate is the 5-day weather forecast for Grožnjan?
A 5-day forecast is fairly reliable: the first 2–3 days are usually very accurate, while days 4–5 may be refined. The data is updated several times a day, so check back before important plans.
Which of the next 5 days in Grožnjan will be the warmest and which the coolest?
Over the next 5 days the temperature in Grožnjan ranges from about 16 to 25 °C. Compare the warmest and coolest day on the temperature chart above.
Will it be windy in Grožnjan over the next 5 days?
Over the next 5 days the wind in Grožnjan picks up to 7 m/s. The windiest days are easy to spot on the wind chart above.
Which day of the week in Grožnjan is best for a walk or a trip?
For a walk or a trip, pick the days with the lowest chance of rain (up to 58%) and light wind — easy to compare on the 5-day charts above.
How can I best use the 5-day forecast for Grožnjan?
The first 2–3 days are reliable enough for firm decisions, while days 4–5 are a guide that sharpens as they approach. The forecast is updated several times a day, so check again before important plans.
Will I need an umbrella or sunscreen in Grožnjan this week?
Rain reaches a 58% chance across the next 5 days, so pack something waterproof for the wettest of them — the daily strip above shows which. Today’s UV index peaks at 4.3; sunscreen is worth it from about 3 upwards.
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.