Best time to visit Trondheim

Re-score for me — drag the dial — every chart on the page recolours live for your heat limit 27°C
I'm comfortable up to 27°C feels-like
22° heat-averse 30° heat-loving

Default 27 °C is the upper edge of the Holiday Climate Index "ideal comfort" band (Scott, Rutty, Amelung & Tang, 2016). Above this, most warm-tourism travellers report measurable discomfort.

Saved to this browser. Changes update the strips below.
Recent · 2020-2024
Interest Google Trends 2021-2025 searches, not arrivals (?)
Day · avg daily high (?)
Night · avg overnight low (?)
UV index · On a typical day around midday, UV is about this (?)
12333221
On the sunniest 1 in 10 days, UV reaches this — and even higher
4554
PM2.5 air quality · on a typical day (?)
455444434445
On the worst 1 in 10 days, PM2.5 reaches this — and even higher
7786776565710
June 6/10 feels 16°C (+2°C vs 1991-2020) · HCI 63/100
Day 18° · Night 10° 64% humidity 18 km/h wind 14 rain days (182h) 272h sun
Thermal 7
Sky 6
Rain 5
Wind 10

Higher = better, including rain & wind (green = "doesn't hurt the score", not "lots of it").

How is this scored? HCI / Steadman / CCI gate — full methodology and citations below.

Compare with another destination

Add as many as you like — stacked below the main strips above. Each row is just the recent-window score strip and (for beach destinations) sea-temperature strip.

Tours in Trondheim

6 top-rated tours via Viator. Booking links earn this site a commission at no cost to you. Map locations are approximate (centred on Trondheim).

  1. 1Trondheim: Discover the city of kings with a local guide4.88★ (48)2hfrom $48
  2. 2Trondheim's Regalia Self-Guided Tour of Norway's Historic Centre4.92★ (12)from $10
  3. 3Trondheim to Trondheim Airport (TRD) Departure Private Transfer5.00★ (1)40mfrom $111
  4. 4Trondheim Vaernes Airport (TRD) to Are Resort - Arrival Transfer5.00★ (1)2hfrom $215
  5. 5Trondheim Vaernes Airport TRD to Are Resort - Round-Trip Transfer5.00★ (1)4hfrom $431
  6. 6Trondheim Private Walking Tour5.00★ (1)2hfrom $467

Last refreshed 2026-06-18.

Similar climatesÅlesund89% · Stavanger87% · Giant's Causeway87%

Other destinations with the most-alike year-round climate to Trondheim (apparent temperature, rain hours, sunshine — matched within the same trip-profile). The ±N chip compares each match's typical score for the current month against Trondheim's. Based on the 2020-2024 climatology, not this year's actual weather.

Month-by-month

Month Temp °C Feels °C Rain days Rain h Rain h/day Humidity Wind km/h Sun h UV Interest Score
Jan -4–1 -3 18 259 14.4 76% 20 39 — Quiet 2
Feb -4–2 -3 17 211 12.4 72% 20 84 — Quiet 3
Mar -2–5 0 16 224 14.0 69% 20 153 1 Quiet 3
Apr 0–7 3 14 225 16.1 66% 19 208 2 Quiet 3
May 5–13 10 16 208 13.0 62% 18 273 3 Quiet 5
Jun 10–18 16 14 182 13.0 64% 18 272 3 Quiet 6
Jul 12–18 17 21 270 12.9 71% 17 255 3 Quiet 4
Aug 11–17 16 17 218 12.8 74% 17 224 2 Peak 5
Sep 8–14 12 17 219 12.9 77% 17 158 2 Moderate 4
Oct 4–9 6 21 283 13.5 83% 18 97 1 Moderate 2
Nov 0–4 0 15 204 13.6 79% 19 56 — Busy 3
Dec -4–1 -4 13 198 15.2 77% 18 24 — Moderate 3

UV Index in Trondheim by Month

UV index in Trondheim peaks at 3 (moderate) in June, dropping to 0 (low) in January.

Best months in detail

June

6/10

10–18°C (feels 16°C) · 14 rain days (182h) · 272 sun hours · 64% humidity · Quiet crowd · UV 3 (moderate) · sunniest 1 in 10 days reach 5 (moderate)

August

5/10

11–17°C (feels 16°C) · 17 rain days (218h) · 224 sun hours · 74% humidity · Peak crowd · UV 2 (low) · sunniest 1 in 10 days reach 4 (moderate)

May

5/10

5–13°C (feels 10°C) · 16 rain days (208h) · 273 sun hours · 62% humidity · Quiet crowd · UV 3 (low) · sunniest 1 in 10 days reach 4 (moderate)

Every month

Show the other 9 months in detail

January

2/10

-4–1°C (feels -3°C) · 18 rain days (259h) · 39 sun hours · 76% humidity · Quiet crowd

February

3/10

-4–2°C (feels -3°C) · 17 rain days (211h) · 84 sun hours · 72% humidity · Quiet crowd

March

3/10

-2–5°C (feels 0°C) · 16 rain days (224h) · 153 sun hours · 69% humidity · Quiet crowd · UV 1 (low)

April

3/10

0–7°C (feels 3°C) · 14 rain days (225h) · 208 sun hours · 66% humidity · Quiet crowd · UV 2 (low)

July

4/10

12–18°C (feels 17°C) · 21 rain days (270h) · 255 sun hours · 71% humidity · Quiet crowd · UV 3 (moderate) · sunniest 1 in 10 days reach 5 (moderate)

September

4/10

8–14°C (feels 12°C) · 17 rain days (219h) · 158 sun hours · 77% humidity · Moderate crowd · UV 2 (low)

October

2/10

4–9°C (feels 6°C) · 21 rain days (283h) · 97 sun hours · 83% humidity · Moderate crowd · UV 1 (low)

November

3/10

0–4°C (feels 0°C) · 15 rain days (204h) · 56 sun hours · 79% humidity · Busy crowd

December

3/10

-4–1°C (feels -4°C) · 13 rain days (198h) · 24 sun hours · 77% humidity · Moderate crowd

Frequently asked questions about visiting Trondheim

When is the best time to visit Trondheim?

June is the highest-scoring month (6/10 on the Holiday Climate Index). Typical conditions: 10–18°C (14 rainy days). The top three months by score are June, August, May.

What is the worst time to visit Trondheim?

January is the lowest-scoring month (2/10). Typical conditions: -4–1°C (18 rainy days).

When are crowds lowest in Trondheim?

Search-interest seasonality (Google Trends 2021-2025) is lowest in March and peaks in August. Interest tracks both in-trip visitors and lead-time planners, so treat it as a "destination is on people's minds" signal rather than literal arrivals.

Which months in Trondheim have good weather but fewer tourists?

June (climate 6/10, crowd index 11) — shoulder months with above-average climate and below-median search-interest. Often the best value-for-weather trade.

What is the UV index in Trondheim by month?

UV peaks at 3 (moderate) in June and is lowest in January at 0 (low). Monthly peak values: Jan —, Feb —, Mar 1, Apr 2, May 3, Jun 3, Jul 3, Aug 2, Sep 2, Oct 1, Nov —, Dec —.

What is the UV index in Trondheim in June?

June is the peak UV month in Trondheim, with a daily-peak UV index of 3 (moderate). Standard sun protection — sunglasses and light SPF — is recommended.

How high can UV get in Trondheim on the sunniest days?

Most days look like the monthly average, but on the sunniest ~1 in 10 days UV climbs higher than the mean suggests. July is the worst case: typical days average UV 3 (moderate), but the top 10% of days reach UV 5 (moderate) — and even higher. Months where the sunniest days routinely exceed the typical reading: May, June, July, August. Plan sun protection for the worst case, not the average.