May Weather in Trondheim, Norway

Last updated: August 27, 2025

May in Trondheim, Norway, showcases a vibrant transition into the warmer months, with temperatures fluctuating from a cool -2°C (28°F) at night to a pleasant peak of 27°C (80°F) during the day. The average temperature rests around 9°C (49°F), creating a mild atmosphere. However, with 70 mm (2.7 in) of precipitation spread over 15 days, residents and visitors alike can expect a fair share of cloudy and rainy spells, complemented by an average humidity level of 83%. This month is a reminder that while spring begins to bloom, nature still maintains its refreshing unpredictability in Trondheim.

May Temperature in Trondheim

May in Trondheim, Norway, signals a welcoming shift towards warmer days, with average temperatures rising to a comfortable 9°C (49°F). This month marks a significant departure from the biting cold of winter, as you can expect nighttime lows of -2°C (28°F) and daytime highs reaching an exhilarating 27°C (80°F). The gradual increase in warmth observed from April to May hints at the arrival of vibrant summer days, making it an ideal time for outdoor adventures and enjoying the blossoming landscape. As the city shakes off the remnants of snow and ice, May invites both locals and visitors to embrace the fresh air and longer daylight hours, heralding a delightful transition into the season of warmth.

May Weather in Trondheim: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Trondheim, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trondheim, May typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec292833404857605752433531
Data source: Temperature data for Trondheim generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Trondheim

May in Trondheim marks a transition into milder weather, as the total precipitation drops to 70 mm (2.7 in). This decline is notable compared to the preceding months, particularly the wetter March, which saw 111 mm (4.4 in). With 15 days of rain, May offers a balanced mix of sunny breaks and typical Norwegian spring showers, making it a refreshing month for locals and visitors alike. This pattern hints at a shift towards drier conditions as summer approaches, with June expected to bring slightly higher precipitation at 89 mm (3.5 in), but still less than the rainy spells of earlier months. Overall, May is a glimpse of the warming spring where the remnants of winter’s rain gradually give way to sunnier skies.

May Precipitation Trends in Trondheim

The chart displays monthly precipitation patterns in Trondheim, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Trondheim, May typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec94751119470898811812412388105
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Trondheim

In Trondheim, Norway, May marks a turning point in humidity levels as they drop to 83%, signaling the onset of drier spring conditions. This trend of decreasing humidity began in April, when levels fell to 86%, and continues into the early summer months. As winter's grip loosens, the air feels fresher and more invigorating, providing a pleasant reprieve from the damp, chill of the preceding months. June and July maintain similar humidity at 81%, encouraging outdoor activities and enjoying the longer daylight. As we transition into summer, it's evident that Trondheim's humidity gradually ebbs, creating a more breathable atmosphere perfect for exploration and adventure.

May Average Humidity in Trondheim

This chart illustrates the average monthly humidity levels in Trondheim, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Trondheim is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec96%94%91%86%83%81%81%88%90%93%95%97%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Trondheim

As spring blossoms into summer, May in Trondheim, Norway, marks a notable shift in UV exposure, with the UV Index rising to 5—indicating a moderate risk of harm from unprotected sun exposure. This increase from April's Index of 4 calls for a potential reduction in burn time to just 30 minutes for those with lighter skin tones. Residents and visitors alike should take advantage of the longer days while remaining mindful of sun safety, as the UV levels continue to climb, paving the way for June's high UV Index of 6. Embracing the outdoors in May offers a delightful opportunity, but awareness of sun protection is key as Trondheim transitions into sunnier months. For more detailed information, check out the Trondheim UV Index.

Maximum UV Index Levels in Trondheim for May

The chart shows the monthly maximum UV Index (UVI) for Trondheim in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Trondheim typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112456653211
Data source: Trondheim May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

May Sunshine in Trondheim

As May rolls into Trondheim, a remarkable transformation unfolds in the sky, bringing with it an invigorating surge of sunshine. Transitioning from the modest 57 hours in January to an impressive 419 hours by the time spring reaches its peak, May stands out as a vibrant highlight in the annual solar calendar. This significant increase not only marks a shift from the dark winter months but also positions May as a turning point, where daylight flourishes and outdoor activities beckon. The ascent continues into June and July, with sunshine hours reaching their zenith, but it's May that truly sets the stage for the sunny days ahead. With each hour of sunlight, the city awakens, energizing its people and inviting all to embrace the beauty of nature once more.

Monthly Sunshine Duration in Trondheim: May Highlighted

The May sunshine duration represents the total number of hours Trondheim experiences direct sunlight during the month of May, excluding cloudy or obstructed periods. This chart compares the sunshine duration of May with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec57h156h241h320h419h413h431h372h258h199h117h60h
Data source: Trondheim May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Trondheim During May

In Trondheim, Norway, the likelihood of basking in sunny weather peaks in the depths of winter but takes a surprising turn in May, with only a 28% chance of sunshine. This transitional month experiences a decline in sunny days compared to April's 29%, reflecting a gradual shift towards the cooler summer months. While May marks the run-up to summer, the weather remains unpredictable, echoing the challenges of maintaining a consistent sun-filled forecast throughout spring. As residents and visitors eagerly await the warmth of June, they find themselves navigating a landscape where the sun's presence is increasingly fleeting, making those rare sunny moments all the more cherished.

Percentage of Sunny Days in May in Trondheim

The chart illustrates the percentage of sunny days in Trondheim throughout the year, with May highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Trondheim experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec41%35%22%29%28%25%28%28%20%14%20%25%
Data source: Trondheim May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Trondheim in May

As the calendar turns to May in Trondheim, Norway, daylight begins to flourish, offering an impressive 18 hours of sunlight each day. This marks a significant increase from the 15 hours in April, establishing a clear trend of growing brightness that characterizes the enchanting Nordic spring. The gradual ascent of daylight hours, starting from a mere 5 hours in January, highlights the transition from the dark winter months to the vibrant summer. Following May, June reaches the peak with 20 hours of light, before the days slowly begin to shorten. This pattern not only showcases the beauty of shifting seasons but also invites residents and visitors alike to revel in the long, luminous days that define this charming region.

Average Daylight Hours in Trondheim for May

The chart illustrates the variation in daylight duration in Trondheim throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec5h 46m8h 40m11h 50m15h 3m18h 13m20h 19m19h 8m16h 5m12h 54m9h 44m6h 38m4h 41m
Data source: Trondheim daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in Trondheim

In Trondheim, Norway, the month of May ushers in the gentle caress of a light breeze, with an average wind speed of 1.9 m/s (4 mph). Following the typically windier months of March and April, where speeds reached 3.3 m/s (7 mph) and 2.7 m/s (6 mph) respectively, May presents a noticeable dip in wind intensity. This calm atmosphere continues into June, matching May's stillness with the same average speed. The trend reveals a pattern of increased winds during the earlier spring months, likely influenced by seasonal changes, before settling into a more tranquil pace as summer approaches. Such mild winds create a serene backdrop for enjoying the vibrant spring scenery, highlighting a peaceful transition in Trondheim’s climate.

Average May Wind Speed in Trondheim

The chart displays monthly wind speed patterns in Trondheim, with values for each month shown alongside May's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how May's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.22.43.32.71.9 m/s1.92.22.12.52.72.52.9
Data source: Trondheim May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in Trondheim Compares to Other Months

Weather in Trondheim varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Trondheim, focusing on differences in temperature, rainfall, humidity, and UV levels.

When comparing the weather in May and January, it’s clear that May brings milder temperatures and more variability. In May, the temperature ranges from a brisk -2°C (28°F) at its lowest to a warm 27°C (80°F) at its highest, with an average of 9°C (49°F). However, it also experiences considerable humidity at 83% and receives about 70 mm (2.7 in) of precipitation over 15 days. In contrast, January is much colder, with temperatures plummeting to a low of -18°C (-1°F) and averaging -2°C (29°F), reaching a maximum of only 12°C (53°F). Although January sees slightly more precipitation at 94 mm (3.7 in) over 14 days, it comes with a higher humidity level of 96%, making the cold feel even more biting. For a closer look at the specifics of January weather, you can visit Trondheim weather in January.

May and February present stark contrasts in weather conditions. In May, temperatures range from a chilly minimum of -2°C (28°F) to a pleasant maximum of 27°C (80°F), with an average temperature of 9°C (49°F). The month sees around 70 mm (2.7 in) of precipitation over approximately 15 days, coupled with relatively high humidity at 83%. In contrast, February is much colder, with temperatures dipping as low as -25°C (-12°F) and struggling to reach a maximum of only 10°C (50°F), averaging -2°C (29°F). Despite seeing slightly more precipitation at 75 mm (3.0 in) over 13 days, humidity levels are higher at 94%. For more detailed insights, you can check out Trondheim weather in February.

Compared to March, the weather in May is significantly milder and more pleasant. In March, temperatures can drop as low as -24°C (-12°F) and typically hover around an average of 1°C (33°F), while May offers a much more comfortable range, with a minimum of -2°C (28°F) and an average of 9°C (49°F), peaking at a warm 27°C (80°F). Precipitation in March is also more pronounced, totaling 111 mm (4.4 in) over 18 days, compared to May's 70 mm (2.7 in) over 15 days. Despite May having slightly lower humidity at 83%, it still feels much more inviting than the 91% humidity often experienced in March. For more details about the specific conditions in March, you can check Trondheim weather in March.

In comparing the weather between April and May, we can observe a significant warming trend as spring progresses. May features a minimum temperature of -2°C (28°F) and an average temperature of 9°C (49°F), peaking at a comfortable 27°C (80°F). In contrast, April experiences cooler temperatures with a minimum of -12°C (11°F) and an average of 5°C (40°F), with a maximum of 22°C (72°F).

Precipitation also differs slightly, with May receiving 70 mm (2.7 in) over 15 days compared to April's 93 mm (3.7 in) across 16 days, indicating that while both months are relatively damp, May tends to be somewhat drier. Humidity levels remain high in both months at 83% for May and 86% for April, contributing to a generally crisp atmosphere. For a more detailed view of April's weather, visit Trondheim weather in April.

May and June in Trondheim exhibit distinct differences in weather patterns. May experiences a broader temperature range, with minimums plummeting to -2°C (28°F) and maximums reaching 27°C (80°F), averaging around 9°C (49°F). Meanwhile, June offers milder conditions with minimums at 3°C (37°F) and maximums soaring to 32°C (89°F), resulting in a more consistent average temperature of 14°C (57°F). Precipitation also fluctuates, with May receiving 70 mm (2.7 in) over 15 days, while June sees slightly more rain with 89 mm (3.5 in) across 14 days. Humidity levels remain relatively similar, with May at 83% and June at 81%. For a deeper look into June’s weather specifics, check out Trondheim weather in June.

May and July exhibit notable differences in weather patterns. May sees a broader temperature range, with minimums dipping as low as -2°C (28°F) and a pleasant average of 9°C (49°F), while July enjoys warmer conditions with a minimum of 5°C (41°F) and an average temperature of 16°C (60°F). Precipitation levels are slightly higher in July, accumulating 88 mm (3.5 in) over 16 days compared to May's 70 mm (2.7 in) over 15 days. Humidity remains relatively high in both months, with May at 83% and July slightly lower at 81%. For more detailed information on July weather, you can check Trondheim weather in July.

May and August in Trondheim showcase distinct weather characteristics, reflecting the transition from spring to summer. In May, temperatures range from a chilly -2°C (28°F) to a pleasant 27°C (80°F), with an average of 9°C (49°F). The month sees about 70 mm (2.7 in) of precipitation over 15 days, accompanied by a humidity level of 83%. In contrast, August presents warmer conditions, featuring temperatures that range from a minimum of 4°C (40°F) to a maximum of 31°C (88°F), with an average of 14°C (58°F). Precipitation rises to 118 mm (4.6 in), still occurring across 15 days, but the humidity increases slightly to 88%. For a closer look at August weather in Trondheim, check out Trondheim weather in August.

The weather in May is marked by a wider temperature range, with minimums dipping as low as -2°C (28°F) and maximums reaching up to 27°C (80°F), offering a pleasant average of 9°C (49°F). In contrast, September presents a cooler climate, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 22°C (71°F) and an average of 11°C (52°F). While May experiences approximately 70 mm (2.7 in) of precipitation over 15 days, September sees a significant increase, with 124 mm (4.9 in) of rainfall over 17 days, contributing to a higher humidity level of 90%. For more specifics about the weather conditions, you can check Trondheim weather in September.

May and October present striking differences in weather. In May, temperatures range from a brisk -2°C (28°F) to a comfortable 27°C (80°F), with an average of 9°C (49°F), while October sees cooler temperatures with a minimum of -4°C (24°F) and an average of 6°C (44°F). Precipitation is also more pronounced in October, with 123 mm (4.8 in) over 19 days compared to May's 70 mm (2.7 in) over 15 days. Additionally, October tends to be more humid, reaching 93% compared to May's 83%. For a detailed look at October weather, visit Trondheim weather in October.

May and November present strikingly different weather patterns. In May, temperatures typically range from a minimum of -2°C (28°F) to a comfortable maximum of 27°C (80°F), with an average of 9°C (49°F). The month sees about 70 mm (2.7 in) of precipitation over 15 days, combined with a humidity level of 83%. In contrast, November experiences much colder temperatures, with a minimum of -14°C (7°F) and an average of just 2°C (36°F). The maximum reaches only 14°C (57°F), accompanied by higher precipitation levels at 88 mm (3.5 in) over 13 days and increased humidity at 95%. The notable chill in November is further detailed in this link: Trondheim weather in November.

May and December present starkly contrasting weather conditions. In May, temperatures range from a brisk minimum of -2°C (28°F) to a comfortable maximum of 27°C (80°F), with an average of 9°C (49°F). It typically sees about 70 mm (2.7 in) of precipitation over 15 days, accompanied by humidity levels around 83%. In contrast, December experiences much colder temperatures, with a minimum of -16°C (3°F) and an average temperature of -1°C (31°F), peaking at only 10°C (50°F). Precipitation increases to 105 mm (4.1 in) over the same number of rainy days, and humidity rises to a high 97%, making the month feel even chillier. For more detailed information on December weather, check out Trondheim weather in December.

Compare Trondheim's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in Trondheim

As May graces Trondheim, the city transitions into a season of warmth and awakening. With temperatures climbing significantly compared to the chill of earlier months, the average daily warmth invites locals and visitors alike to enjoy the burgeoning greenery. Despite the increase in warmth, May isn’t without its showers, with rainfall characteristic of about half the month. This combination of pleasant temperatures and occasional precipitation creates a lively atmosphere, perfect for outdoor activities. For a deeper dive into how May weather stacks up against the rest of the year, check out our Trondheim Climate page.