Weather & Best Time to Visit Gotland
With around 2,100 hours of sunshine a year, Gotland is one of Sweden's sunniest regions. Climate through the seasons, sea temperatures and the best time to visit.
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The sunniest island in the Baltic
With around 2,100 to 2,150 hours of sunshine a year, Gotland is one of the sunniest regions in Sweden. The reason is its position out in the Baltic Sea: the surrounding water tempers both heat and cold, giving the island a balanced, maritime climate. Summers are pleasantly mild as a result, and winters comparatively gentle, the sea buffers the sharpest cold snaps.
You'll notice the exposed, open location most clearly in the wind. The coasts most exposed to it, above all Fårö in the north and Hoburgen at the southern tip, get a stiff breeze even in summer. A windbreaker and sun protection are worth packing year-round.
Temperatures through the year
Visby has the island's most reliable climate data. Averaged over the year, daytime highs and overnight lows look like this:
- Summer: July is the warmest month at around 21 / 13°C, closely followed by August at around 20 / 13°C. June is cooler at around 17 / 10°C, and September sits at 15 / 10°C.
- Winter: Mild by Scandinavian standards. December averages 3 / -1°C, January 2 / -1°C, and February, the coldest month, comes in at around 1 / -3°C (monthly mean around -0.4°C). By March, values climb back up to around 3 / 0°C.
Heatwaves are rare, and so is bitter cold. If you're expecting 30°C summer days, you'll rarely find them on Gotland, the climate stays moderate.
Sunshine and daylight
The island's northerly latitude shows its full range when it comes to light. June is the sunniest month, with around 11 hours of sunshine a day (roughly 330 hours over the month), and both May and July bring 10 to 11 sunshine hours daily. At the other end of the scale, December gets only around one hour of sunshine a day (about 32 hours over the whole month).
The difference in day length is even more striking:
- Summer solstice (21 June): around 18 hours of daylight. The sun rises at about 3:46 and doesn't set until about 21:51, with the nights in between never fully dark.
- Winter solstice (21 December): only around 6.5 hours of daylight. Daylight hours are in short supply, which sets the tone for the quiet off-season.
The long, bright evenings in June and July are one of the biggest draws of a summer visit, hikes and evenings on the beach can stretch well into the night.
Sea temperature and swimming season
The Baltic Sea warms up slowly, and that shapes the swimming season more than air temperature does. Even at the height of summer, the water around Gotland stays cool:
- June: still a cool around 12°C, mainly for the hardy.
- July: 16 to 17°C, the first month that's genuinely swimmable.
- August: the warmest month at 17 to 18°C.
- September: temperatures fall again as the swimming season winds down.
That makes July and August the clear best time for relaxed swimming with children. If you're sensitive to cool water, plan accordingly. For more on the best coves and beaches, see the swimming guide.
Rainfall and wind
With around 530 to 620 mm of rain a year, Gotland is relatively dry by Swedish standards, and rainfall is spread fairly evenly across the seasons. Even so, there are clear patterns:
- Driest period: March and April, with only around 25 to 33 mm per month.
- Summer: the drier season, with around 6.5 to 8 rain days per month from June to August.
- Wettest period: autumn, with November the rainiest month (close to 9 to 10 rain days).
Wind is strongest in winter - January averages around 22 km/h. Spring and summer are noticeably calmer, with May the stillest month. The prevailing wind direction shifts through the year: mostly southerly in spring and early summer, westerly in late summer and winter. The open coasts stay breezier than the interior year-round.
Best time to visit, when it's worth it
The right time to visit depends on what you're after:
- Peak summer (July, early August): swimming, long bright evenings, and every attraction running at full tilt, plus Medieval Week (2 to 9 August 2026), the cultural high point of the year. This is also the most expensive and most crowded stretch: Destination Gotland's ferry fares peak in July and August.
- June and September: mild weather, smaller crowds and noticeably better value. Ferry fares outside peak summer run roughly 20 to 30 percent lower. Ideal for hiking and cycling, and early summer also brings the wild orchids into bloom. The sea is still cool for swimming in June, though.
- Winter (November to March): quiet and raw, with many seasonal attractions closed for the season. Visby has its own charm during Advent, though, with the medieval Christmas market at the St Nicolai ruins (set for 4 to 6 December 2026, opening with a torchlit procession on 5 December) and a Christmas market on Stora Torget on the first Sunday of Advent.
For dates and the season's full programme, see the events guide; for practical planning advice, see travel information.