Tromso Weather in September

🇳🇴 Norway

10°C

High

6°C

Low

Rain Days

Sunshine

65%

Humidity

Europe › 🇳🇴 Norway › Tromso

Updated: March 2026

Is September a Good Time to Visit Tromso?

3/10

Avoid

September is a avoid time to visit Tromso (3/10). Rainfall dominates the picture, with 17 wet days and just 6 sunshine hours daily, conditions that demand a flexible itinerary. September suits travellers visiting for indoor culture, food, and architecture rather than outdoor activities. Pack accordingly for 17 potential rain days. October offers a similar profile at lower hotel rates if dates are flexible. Watch out for prolonged rain stretches: with 17 wet days, a fully outdoor itinerary is risky. Build in museum days and covered market visits as contingency. Planning tips: most accommodation categories have availability, and last-minute deals are common. The quieter streets and shorter queues can make this a genuinely enjoyable time to visit for the right type of traveller. Budget-conscious visitors will find the best value of the year in this period.

vs August:15°C avg high

Visiting Tromso in September means cold, wintry days that rarely climb above 10°C. Factor in 17 potential rainy days and 65% average humidity when planning your daily activities.

10°C

Avg High

6°C

Avg Low

17 days

Rain Days

Sunshine

65%

Humidity

Temperature in Tromso in September

The narrow 4°C gap between daytime and overnight temperatures, characteristic of coastal cities with maritime moderation, means a single mid-layer works across the whole day. Humidity averages 65%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. UV index averages 6 this month, classed as moderate. Sunscreen is a sensible precaution for extended outdoor time, particularly at midday. Winds are calm at an average 13 km/h, so wind-chill is not a factor in planning your clothing. In Fahrenheit: 50°F average high, 43°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).

Temperature in September

Monthly Precipitation (mm)

What to Wear in Tromso in September

Morning6°CBefore the day warms up

Afternoon10°CPeak daytime temperature

Evening9°CAfter sunset cools down

Packing for Tromso in September means dressing for 10°C days and 6°C evenings. Layering is key: a thermal base, mid-layer fleece, and a windproof outer jacket for 10°C highs that feel colder in the wind. Evening temperatures settle at 6°C, a modest 4°C drop that a light cardigan or denim jacket covers. European cobblestones reward low-profile walking shoes over flip-flops or heels, with cushioned trainers or leather walking shoes being the practical choice. With 17 rain days expected, a compact travel umbrella is worth the bag space. A waterproof jacket is better than an umbrella if you plan full-day outdoor routes.

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Local tip: Tromso's cobbled streets turn slippery in the rain. Waterproof walking shoes with a non-slip sole outperform fashionable footwear on wet stone, and you'll cover significantly more ground in comfort.

Events in Tromso in September

September has no major festivals or public holidays in Tromso, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.

What to Pack for Tromso in September

Based on 10°C average highs and 17 rainy days

Warm jacket (down or fleece)
Merino wool base layer (regulates temperature and resists odour)
Sweaters and lined trousers
Scarf and lightweight gloves
Compact folding umbrella
Waterproof outer layer or packable rain jacket
Quick-dry clothing that recovers fast after a shower
Comfortable walking shoes (a second pair lets the first air out overnight)
Universal travel adapter
Small day pack for city exploration
Reusable water bottle

Best Activities in Tromso in September

Vigorous walking tour of the UNESCO heritage districtMidday (12-2pm)The 10°C peak temperature provides ideal conditions for brisk sightseeing walks
Cycling the riverside or park circuitAfternoon (1-4pm)Cool dry air makes long cycling sessions comfortable without overheating
Explore hilltop viewpoints and fortressesMorning for clear viewsCold-weather atmospheric clarity gives the longest sightlines of the year
Open-air Christmas or seasonal marketsAfternoon into eveningCool temperatures make festive outdoor markets genuinely atmospheric
Spend a morning in the national or city art museumOpens at 10am; arrive earlyWith 17 rain days expected, having a full-day indoor plan is practical insurance
Cooking class focused on regional cuisineHalf-day sessions run 10am-1pm or 3-6pmIndoor activity that fills a rainy half-day with genuine cultural content
Visit covered historical sites: cathedral, palace, or bazaarAny time; most crowded middayRoofed monuments and covered markets provide exploration without weather exposure
Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningSeptember brings distinct seasonal changes to public green spaces worth exploring
Warm up with traditional hot dishes: local stew, fondue, or braised specialities at a neighbourhood restaurantLunch (12-2pm) or dinner (7-9pm)Cold-weather cuisine is a genuine cultural experience and the best local restaurants serve their heartiest dishes in cooler months

Why is Tromso cool in September?

September brings the first meaningful shift toward cooler conditions in Tromso, as the sun angle drops and day length shortens. Temperatures averaging 10°C by day and 6°C overnight are still comfortable by most standards, but the trend is clearly downward. At 70 degrees north latitude, autumn light has a particular quality: lower in the sky and warmer in tone, it gives the city a photogenic quality quite different from summer. Evening temperatures already demand a jacket, but midday hours stay pleasant for sightseeing. Climate data: Open-Meteo ERA5 (1991–2020).

Sunshine Hours

The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.

UV Index

A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate -- wear sunscreen. UV 6-7: High -- hat and SPF 30+ essential. UV 8-10: Very High -- limit midday exposure. UV 11+: Extreme -- seek shade between 10am-4pm.

Rain Days

A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.

Humidity

Relative humidity as a percentage. Below 40%: Dry -- skin and throat may feel parched. 40-60%: Comfortable -- ideal for most people. 60-80%: Sticky -- light, breathable fabrics recommended. Above 80%: Muggy -- heat feels more intense; quick-dry clothing is essential.

Frequently Asked Questions: Tromso in September

In September, Tromso experiences average highs of 10°C (50°F) and lows of 6°C (43°F). Expect around 17 rainy days and 6 hours of sunshine per day, with humidity averaging 65%. The 4°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 6, so sun protection is advisable on clear days.

Tromso typically sees 17 rainy days in September, with total precipitation of around 124mm. This is a notably wet period. A waterproof jacket or compact umbrella is essential, and it is worth building indoor alternatives into your daily itinerary for the inevitable rainy stretches. For context, the driest month in Tromso typically sees 4-6 fewer rain days than September.

Pack a warm jacket, sweaters, and layering pieces for Tromso in September. Temperatures can drop to 6°C at night, so thermal underlayers are advisable for evening outings. Waterproof footwear is important with 17 rainy days expected. A scarf, hat, and gloves handle the windchill on clear cold days, which often feel colder than the thermometer reads.

September can be a challenging time to visit Tromso due to heavy rainfall across 17 days of the month. Indoor attractions, cultural sites, and covered markets are the strongest options this month. If your dates are flexible, the drier or milder months offer significantly easier travel conditions.

The average high temperature in Tromso in September is 10°C (50°F), and the average low is 6°C (43°F). The mean daily temperature is approximately 8°C (46°F). The day-to-night range of 4°C is narrow, typical of coastal or maritime cities. 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.

September is shoulder or low season in Tromso, meaning fewer tourists and generally lower prices than peak months. With 6 sunshine hours and 17 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 September, Tromso suits a range of activities thanks to cool conditions around 10°C. With frequent rain, indoor activities and covered attractions are a smart choice. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. Cosy cafes and cultural venues make ideal retreats on overcast days.

September ranks 7th sunniest of the year in Tromso, with an average 6 daily sunshine hours. The driest months are February, January, and April. July is the hottest month (16°C avg high); January is the coolest (-6°C). From here, temperatures fall 6°C into October. Compared to last month (August: 15°C high, 16 rain days), September is cooler and wetter. September sits in the middle of the annual sunshine ranking for Tromso, offering a reasonable balance of good weather and manageable crowds.

Year-Round Climate

Month	High	Low	Rain Days	Sun	Details
January	-6°C	-11°C	15	1h	View
February	-6°C	-10°C	14	2h	View
March	-3°C	-7°C	16	6h	View
April	2°C	-3°C	15	9h	View
May	7°C	1°C	16	11h	View
June	12°C	6°C	15	12h	View
July	16°C	10°C	15	11h	View
August	15°C	9°C	16	9h	View
September	10°C	6°C	17	6h	View
October	4°C	0°C	17	3h	View
November	-1°C	-6°C	15	1h	View
December	-4°C	-9°C	16	1h	View

Other Months in Tromso

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Plan Your Trip to Tromso

Best Time to Visit Tromso

Data Sources for Tromso

Tromso on Wikipedia Open-Meteo Climate API NOAA National Centers UK Met Office WMO GeoNames

Climate normals represent 30-year averages (1991-2020). Individual years may vary.