5-day weather forecast Grožnjan 18-08-2026
Weather forecast Grožnjan Tuesday, August 18 18.08.2026: sunny, temperature from 19 °C to 27 °C.
Precipitation probability 66%. Wind up to 4.5 m/s (gusts 6.86 m/s). Air humidity 45–89%, atmospheric pressure 757–761 mm Hg, UV index up to 7.
Weather Alerts
Hide alertsSevere High temperature Warning (Degree 3/4) - Slovenia / South-West
Severe High temperature Warning
High temperatures will affect the health of sensitive members of the population.
Stay in the shade at midday and in the afternoon, while intense physical effort is not recommended. Eat light food and drink enough liquids. Wear airy and light clothes.
Drinking coffee, alcohol or very sweet drinks is not recommended. If you take medication for regulating blood pressure, consult your doctor. Air conditioning should be set to a temperature that is no more than 8 °C lower than the outside temperature. Domestic animals should have enough fresh water and shade. Living premises should be aired out at night and in the morning and sufficient air circulation should be ensured. We recommend shading premises externally. Vehicles parked in the sun should be aired out thoroughly before driving.
Extreme Forestfire danger Warning (Degree 4/4) - Slovenia / South-West
Extreme Forestfire danger Warning
There is an extreme risk of forest and bush fire.
Stay very vigilant. Be ready to take action to protect yourself from a rapidly developing fire. The public are asked to exercise extreme caution in the countryside, and immediately notify emergency services on any fire.
Moderate High temperature Warning (Degree 2/4) - Slovenia / South-West
Moderate High temperature Warning
High temperatures may affect the health of sensitive members of the population.
You are recommended to stay in the shade at midday and in the afternoon, while intense physical effort in the open is not recommended. Eat light food and drink enough liquids.
Vehicles parked in the sun should be aired out before driving.
Severe High temperature Warning (Degree 3/4) - Slovenia / South-West
Severe High temperature Warning
High temperatures will affect the health of sensitive members of the population.
Stay in the shade at midday and in the afternoon, while intense physical effort is not recommended. Eat light food and drink enough liquids. Wear airy and light clothes.
Drinking coffee, alcohol or very sweet drinks is not recommended. If you take medication for regulating blood pressure, consult your doctor. Air conditioning should be set to a temperature that is no more than 8 °C lower than the outside temperature. Domestic animals should have enough fresh water and shade. Living premises should be aired out at night and in the morning and sufficient air circulation should be ensured. We recommend shading premises externally. Vehicles parked in the sun should be aired out thoroughly before driving.
Moderate High temperature Warning (Degree 2/4) - Slovenia / South-West
Moderate High temperature Warning
High temperatures may affect the health of sensitive members of the population.
You are recommended to stay in the shade at midday and in the afternoon, while intense physical effort in the open is not recommended. Eat light food and drink enough liquids.
Vehicles parked in the sun should be aired out before driving.
5 days at a glance — tap a day to open it
Sunrise 06:09
Sunset 20:08
Sunset 20:08
First Quarter37% illuminated
Moonrise 13:00 · Moonset 22:24
Moonrise 13:00 · Moonset 22:24
Chart
Table
Tue, Aug 18, 2026
| Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index | ||
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Light rain shower | 21 °C | 61% (1.08 mm/hr) | 51% | 89% | 760 mm Hg | NE 36° 4.5 (6.86) m/s | 0 |
| 01:00 | Light rain shower | 21 °C | 66% (0.94 mm/hr) | 89% | 86% | 760 mm Hg | ENE 58° 4 (6.36) m/s | 0 |
| 02:00 |  Patchy rain possible | 21 °C | 56% (0.65 mm/hr) | 79% | 85% | 760 mm Hg | E 83° 3.19 (5.56) m/s | 0 |
| 03:00 |  Partly cloudy | 21 °C | 18% | 57% | 85% | 758 mm Hg | E 90° 2.19 (3.31) m/s | 0 |
| 04:00 | Partly cloudy | 20 °C | 13% | 29% | 83% | 757 mm Hg | ENE 58° 2.31 (3.56) m/s | 0 |
| 05:00 |  Clear | 21 °C | 11% | 22% | 80% | 760 mm Hg | NNE 30° 1.69 (3.08) m/s | 0 |
| 06:00 | Clear | 19 °C | 10% | 11% | 81% | 758 mm Hg | NE 52° 2.11 (3.67) m/s | 0 |
| 07:00 |  Sunny | 19 °C | 9% | 10% | 79% | 758 mm Hg | ENE 71° 2.39 (4.03) m/s | 0.2 |
| 08:00 | Sunny | 23 °C | 8% | 10% | 75% | 761 mm Hg | NNE 18° 2.11 (2.92) m/s | 0.6 |
| 09:00 | Sunny | 22 °C | 5% | 8% | 67% | 759 mm Hg | ENE 78° 1.19 (1.42) m/s | 1.5 |
| 10:00 | Sunny | 24 °C | 4% | 9% | 59% | 759 mm Hg | NE 55° 0.61 (0.69) m/s | 2.8 |
| 11:00 | Sunny | 26 °C | 4% | 10% | 60% | 761 mm Hg | NW 304° 1.31 (1.5) m/s | 4.3 |
| 12:00 | Sunny | 26 °C | 2% | 16% | 45% | 759 mm Hg | NNW 334° 1.69 (1.97) m/s | 5.6 |
| 13:00 | Sunny | 27 °C | 2% | 15% | 45% | 759 mm Hg | NW 321° 3.19 (3.67) m/s | 6.2 |
| 14:00 | Sunny | 27 °C | 4% | 13% | 58% | 760 mm Hg | W 278° 3.39 (3.92) m/s | 6 |
| 15:00 | Sunny | 27 °C | 4% | 14% | 59% | 760 mm Hg | W 276° 3.11 (3.61) m/s | 7 |
| 16:00 | Sunny | 27 °C | 4% | 14% | 59% | 760 mm Hg | W 274° 2.89 (3.31) m/s | 7 |
| 17:00 | Sunny | 27 °C | 4% | 15% | 59% | 760 mm Hg | W 273° 2.61 (3.03) m/s | 7 |
| 18:00 | Sunny | 26 °C | 4% | 15% | 61% | 760 mm Hg | WNW 295° 2.11 (2.69) m/s | 7 |
| 19:00 | Sunny | 26 °C | 5% | 14% | 63% | 759 mm Hg | NW 317° 1.61 (2.31) m/s | 7 |
| 20:00 | Sunny | 25 °C | 5% | 14% | 65% | 759 mm Hg | NNW 339° 1.11 (1.97) m/s | 6 |
| 21:00 | Clear | 24 °C | 5% | 15% | 66% | 760 mm Hg | WSW 239° 1.39 (2.61) m/s | 0 |
| 22:00 | Clear | 24 °C | 6% | 15% | 67% | 760 mm Hg | SE 140° 1.61 (3.19) m/s | 0 |
| 23:00 | Clear | 24 °C | 6% | 16% | 68% | 760 mm Hg | NE 40° 1.89 (3.89) m/s | 0 |
Tue, Aug 18, 2026
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.