Tromso has a temperate climate, classified as ET in the Köppen system. The warmest month is July with an average high of 16°C, while the coldest month is January with lows dropping to -11°C. The annual temperature range of 27°C reflects moderate seasonal variation.
The driest month is February with only 14 rain days and 94mm of precipitation. For travellers, February through to the following month typically offers the best balance of warm temperatures and dry conditions. Average humidity ranges from 65% to 65% throughout the year.
Best Time to Visit Tromso
Based on temperature and rainfall data, the best months to visit Tromso are July, August, June. These months offer the most comfortable temperatures with relatively low rainfall, ideal for sightseeing and outdoor activities.
In July, Tromso experiences average highs of 16°C (61°F) and lows of 10°C (50°F). Expect around 15 rainy days and 11 hours of sunshine per day, with humidity averaging 65%. The 6°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an extra jacket is essential for evenings. UV index averages 10, so sun protection is advisable on clear days.
Tromso typically sees 15 rainy days in July, with total precipitation of around 91mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in Tromso typically sees 4-6 fewer rain days than July.
Pack a warm jacket, sweaters, and layering pieces for Tromso in July. Temperatures can drop to 10°C at night, so thermal underlayers are advisable for evening outings. Waterproof footwear is important with 15 rainy days expected. A scarf, hat, and gloves handle the windchill on clear cold days, which often feel colder than the thermometer reads.
July is a reasonable time to visit Tromso. Expect 15 rainy days, so pack a light rain layer for flexibility. Average temperatures of 16°C make outdoor exploration comfortable during the dry periods. With 11 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.
The average high temperature in Tromso in July is 16°C (61°F), and the average low is 10°C (50°F). The mean daily temperature is approximately 13°C (55°F). The day-to-night range of 6°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Tromso is generally June. June offers the most sunshine at 12 hours per day. Average temperatures reach 12°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around June gives you the best chance of dry, bright weather.
July is shoulder or low season in Tromso, meaning fewer tourists and generally lower prices than peak months. With 11 sunshine hours and 15 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In July, Tromso suits a range of activities thanks to cool conditions around 16°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 11 hours of sunshine, parks and waterfront walks are particularly enjoyable.