Winter
Dec → Feb10 to 11°
nights 4 to 6°
- 10 rainy days · 94 mm
- sea 13°
When is the best time to visit Istria?
- Jan10°not recommended
- Feb11°not recommended
- Mar14°not recommended
- Apr17°fair
- May21°recommended
- Jun26°recommended
- Jul29°fair
- Aug29°fair
- Sep24°recommended
- Oct20°recommended
- Nov15°fair
- Dec11°not recommended
RecommendedFairNot recommended· afternoon temperature
The weather in Istria, month by month
The table of records, month by month
| Month | High | Low | Rainfall | Rainy days | Sea | Best |
|---|---|---|---|---|---|---|
| January | 10° | 4° | 70 mm | 9 d | 13° | |
| February | 11° | 6° | 91 mm | 10 d | 12° | |
| March | 14° | 7° | 67 mm | 9 d | 12° | |
| April | 17° | 11° | 76 mm | 9 d | 14° | |
| May | 21° | 15° | 105 mm | 13 d | 18° | ✓ |
| June | 26° | 20° | 70 mm | 9 d | 23° | ✓ |
| July | 29° | 22° | 55 mm | 8 d | 27° | |
| August | 29° | 22° | 64 mm | 7 d | 27° | |
| September | 24° | 18° | 139 mm | 10 d | 25° | ✓ |
| October | 20° | 14° | 119 mm | 10 d | 21° | ✓ |
| November | 15° | 10° | 143 mm | 11 d | 18° | |
| December | 11° | 6° | 122 mm | 10 d | 15° |
The four seasons in Istria, in figures
What the 2015-2024 records (Rovinj) show, season by season, to compare at a glance instead of reading twelve rows of a table.
Spring
Mar → May14 to 21°
nights 7 to 15°
- 10 rainy days · 83 mm
- sea 15°
Summer
Jun → Aug26 to 29°
nights 20 to 22°
- 8 rainy days · 63 mm
- sea 26°
Autumn
Sep → Nov15 to 24°
nights 10 to 18°
- 10 rainy days · 134 mm
- sea 21°
Book early for May to June and September to October
The timing is right, so it is right for everyone: in these months the best places to stay and the small-group tours go first. Here is where to start.
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Daylight in Istria, month by month
The time between sunrise and sunset, from shortest to longest. Not to be confused with the sunshine hours in the table above, which count clear skies. In June there are 15h36 of daylight, in December 8h46, a difference of 6h50.
9h07Jan
10h20Feb
11h47Mar
13h26Apr
14h50May
15h36Jun
15h17Jul
14h04Aug
12h27Sep
10h52Oct
9h28Nov
8h46Dec
Calculated for the latitude of the reference point "Rovinj" (45.08°). Values on the 15th of each month, local solar time.
What to do in Istria, month by month
| Activity | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Beach & swimming | ||||||||||||
| Sightseeing & walks | ||||||||||||
| Diving & snorkelling | ||||||||||||
| Long days | ||||||||||||
| Events | 2 | 2 | 1 | 1 |
EventsPula Film FestivalJulyMotovun Film FestivalJulySubotina in BuzetSeptemberWhite truffle seasonSeptember to NovemberDetails ↓
favourablewith compromisesunfavourable
- Beach & swimming: June, July, August, September
- Sightseeing & walks: January, February, March, April, June, July, August, September, October, November, December
- Diving & snorkelling: July, August, September
- Long days: May, June, July, August
Grid derived from the records (temperature, rainfall, sea), not from an opinion.
What's on in Istria, month by month?
What comes back every year, and when. One of these events fills the hotels and pushes prices up: something to aim for or to avoid, depending on what you want.
- JulyPula Film Festival
Screenings are held in the evening in the Roman amphitheatre for about ten days in July.
- JulyMotovun Film Festival big crowds
The hilltop village becomes an open-air cinema in late July, with screens in the squares and campsites below.
- SeptemberSubotina in Buzet
On the second Saturday of September, Buzet cooks a giant truffle omelette in the square of the lower town.
- September to NovemberWhite truffle season
Truffle dogs work the Motovun forest from September to November, and the konobas (taverns) put it on the menu.
Travelling off-peak
Month by month, in detail
January
Not recommended10°4° at night
- 70 mm · 9 d
- sea 13°
Low season, lower prices
February
Not recommended11°6° at night
- 91 mm · 10 d
- sea 12°
Low season, lower prices
March
Not recommended14°7° at night
- 67 mm · 9 d
- sea 12°
Low season, lower prices
April
Fair17°11° at night
- 76 mm · 9 d
- sea 14°
Low season, lower prices
May
Recommended21°15° at night
- 105 mm · 13 d
- sea 18°
Busy, without the crush
June
Recommended26°20° at night
- 70 mm · 9 d
- sea 23°
Busy, without the crush
July
Fair29°22° at night
- 55 mm · 8 d
- sea 27°
High season, book early
August
Fair29°22° at night
- 64 mm · 7 d
- sea 27°
Busy, without the crush
September
Recommended24°18° at night
- 139 mm · 10 d
- sea 25°
Busy, without the crush
October
Recommended20°14° at night
- 119 mm · 10 d
- sea 21°
Busy, without the crush
November
Fair15°10° at night
- 143 mm · 11 d
- sea 18°
Low season, lower prices
December
Not recommended11°6° at night
- 122 mm · 10 d
- sea 15°
Quiet, then the holidays
Read the twelve months in detail
January. Cool: 10 °C at best, 4 °C at night. Expect 9 days of rain in the month (70 mm). Sea at 13 °C, too cold to swim. Low season: fewer people, lower prices.
February. Cool: 11 °C at best, 6 °C at night. Expect 10 days of rain in the month (91 mm). Sea at 12 °C, too cold to swim. Low season: fewer people, lower prices.
March. Cool: 14 °C at best, 7 °C at night. Expect 9 days of rain in the month (67 mm). Sea at 12 °C, too cold to swim. Low season: fewer people, lower prices.
April. Cool: 17 °C at best, 11 °C at night. Expect 9 days of rain in the month (76 mm). Sea at 14 °C, too cold to swim. Low season: fewer people, lower prices.
May. Mild, 21 °C in the afternoon and 15 °C early in the morning. Expect 13 days of rain in the month (105 mm). Cool sea (18 °C), for the brave. Busy season, without the crush.
June. 26 °C in the afternoon and 20 °C at night. Expect 9 days of rain in the month (70 mm). The sea is at 23 °C: pleasant swimming. Busy season, without the crush.
July. 29 °C in the afternoon and 22 °C at night. Expect 8 days of rain in the month (55 mm). The sea is at 27 °C, a proper swim. High season: book early.
August. 29 °C in the afternoon and 22 °C at night. Rain stays light: 64 mm over 7 days. The sea is at 27 °C, a proper swim. Busy season, without the crush.
September. Mild, 24 °C in the afternoon and 18 °C early in the morning. Expect 10 days of rain in the month (139 mm). The sea is at 25 °C: pleasant swimming. Busy season, without the crush.
October. Mild, 20 °C in the afternoon and 14 °C early in the morning. Expect 10 days of rain in the month (119 mm). Cool sea (21 °C), for the brave. Busy season, without the crush.
November. Cool: 15 °C at best, 10 °C at night. Expect 11 days of rain in the month (143 mm). Cool sea (18 °C), for the brave. Low season: fewer people, lower prices.
December. Cool: 11 °C at best, 6 °C at night. Expect 10 days of rain in the month (122 mm). Sea at 15 °C, too cold to swim. Quiet at the start of the month, then busier as the holidays approach.
Same season, other ideas
Their best time overlaps with this one: worth comparing before you book.
Frequently asked questions
When is the best time to visit Istria?
May to June and September to October: over these months, recorded highs range from 20 to 26 °C, with 11 days of rain a month on average (2015-2024 records, Rovinj).
Which month should you avoid in Istria?
December: it is the wettest of the months to avoid, with 122 mm over 10 days of rain on average, according to 2015-2024 records at the reference point (Rovinj).
What is the hottest month in Istria?
July, with 29 °C on average in the afternoon and 22 °C at night. 2015-2024 records (Rovinj).
What is the coldest month in Istria?
January, with 10 °C at best during the day and 4 °C at night. 2015-2024 records (Rovinj).
What is the driest month in Istria?
July: 55 mm over 8 days of rain, against 143 mm in November, the wettest month.
When can you swim in Istria?
The water reaches 22 °C or more in June, July, August, September (warmest 27 °C in July), measured in 2023-2024 on the nearest coast (Rovinj).
When to go diving or snorkelling in Istria?
July, August, September: the sea is above 25 °C, warm enough to stay in a long time without a thick wetsuit. 2023-2024 records on the nearest coast (Rovinj).
Plan this trip
📒 The free printable Istria guide: itinerary, map, where to sleep→
🧭 When to visit Croatia: the country overview→
🗓️ Best time to visit: all our destinations→
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Photos: AXP Photography / Pexels · Georgiad / CC BY-SA 3.0 (Wikimedia Commons) · Tim Kosi / Pexels · Ramon Karolan / Pexels · Evi Fernengel / Pexels · Gutjahr Aleksandr / Pexels