April Weather in Helsinki, Finland

Last updated: August 21, 2025

April in Helsinki, Finland brings a transition as the city shakes off the grip of winter. With maximum temperatures reaching up to 19°C (67°F), the bustling streets begin to warm, inviting locals and visitors alike to enjoy the blossoming scenery. However, the average temperature hovers around 4°C (39°F), reminding everyone that chill is still in the air, especially as nighttime lows can drop to a brisk -12°C (10°F). This month sees approximately 48 mm (1.9 in) of precipitation spread over 9 days, resulting in a humid atmosphere with levels at 86%. As daylight extends and nature awakens, April is a month of refreshing contrasts in Helsinki.

April Temperature in Helsinki

As April arrives in Helsinki, a notable shift in temperatures signals the onset of spring. The month opens with a chilly minimum of -12°C (10°F), but by mid-April, the city experiences a refreshing average of 4°C (39°F), showcasing a significant warming trend. The days are marked by increasingly pleasant conditions, peaking with maximums reaching up to 19°C (67°F), inviting residents to shed their winter layers and embrace outdoor activities. This transformative month heralds the gradual departure from the harsh winter chill, setting the stage for the emerging warmth and vibrant life that May promises.

April Weather in Helsinki: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Helsinki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Helsinki, April 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).
JanFebMarAprMayJunJulAugSepOctNovDec272630395061646254453830
Data source: Temperature data for Helsinki 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.

April Precipitation in Helsinki

April in Helsinki experiences a brief respite in precipitation, with an average of 48 mm (1.9 in) falling over 9 days. This slight decline from March's 52 mm indicates a subtle shift as the city transitions deeper into spring. The relatively mild rainfall creates a refreshing atmosphere, paving the way for blooming flowers and vibrant landscapes. Interestingly, as the year progresses, April’s precipitation levels are closely mirrored by May, suggesting a consistent pattern of spring moisture that nurtures the awakening flora. Overall, April serves as a gentle bridge, ushering in the lush greenery of late spring while maintaining a balanced weather profile.

April Precipitation Trends in Helsinki

The chart displays monthly precipitation patterns in Helsinki, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Helsinki, April typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec554852485661918376896273
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Helsinki

As April arrives in Helsinki, the humidity begins to show a noticeable decline from the winter months, dropping to 86%. This shift signifies a transition into spring, bringing a breath of fresh air after the persistently high levels seen in January (97%), February (95%), and March (93%). The easing humidity continues into May, where it reaches 75%, suggesting a gradual drying trend that accompanies the warming temperatures. This pattern of decreasing humidity is a welcome change for residents, hinting at the sunnier days ahead while still maintaining a mild level of moisture that defines the Baltic spring. As summer approaches, humidity stabilizes around the mid-70s to low-80s, creating a comfortable climate for outdoor activities before the moisture levels rise again in the following autumn months.

April Average Humidity in Helsinki

This chart illustrates the average monthly humidity levels in Helsinki, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Helsinki is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec97%95%93%87%75%75%80%83%90%93%94%95%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Helsinki

As April arrives in Helsinki, the UV Index climbs to 4, marking a shift from the low levels seen in the earlier winter months. With a moderate exposure category, residents and visitors should be mindful of sun safety, as the burn time is now reduced to 30 minutes. This uptick signals the approach of sunnier days, following March's moderate Index of 3. As the days lengthen and sunlight intensifies, it’s essential to stay vigilant. This pattern continues into May when the UV Index reaches 5, indicating an increase in solar radiation. For more detailed insights into how the UV Index varies throughout the year, visit Helsinki UV Index.

Maximum UV Index Levels in Helsinki for April

The chart shows the monthly maximum UV Index (UVI) for Helsinki in April, 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 April, the maximum UV index in Helsinki typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113457754211
Data source: Helsinki April 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.

April Sunshine in Helsinki

April brings a delightful surge of sunshine to Helsinki, illuminating the city with 362 hours of bright days—a significant leap from the previous months. As winter fades, the increase in daylight is evident, with March having only 261 hours of sunlight, marking a noteworthy transition toward the warmth of summer. This upward trend continues into May and June, where sunshine totals soar to 451 and 493 hours respectively, transforming the city into a vibrant hub teeming with life. The gradual shift from dark, cold winter to the longer, sunnier days of spring heralds not just the arrival of warmer weather, but also a revival of outdoor activities and communal gatherings, making April a pivotal month in Helsinki's annual cycle of light.

Monthly Sunshine Duration in Helsinki: April Highlighted

The April sunshine duration represents the total number of hours Helsinki experiences direct sunlight during the month of April, excluding cloudy or obstructed periods. This chart compares the sunshine duration of April with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec55h154h261h362h451h493h485h406h290h190h113h58h
Data source: Helsinki April Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Helsinki During April

As spring unfolds in Helsinki, April emerges as a promising month for sunshine enthusiasts, boasting a 44% chance of sunny days. This marks a significant leap from the darker winter months, where January offers a mere 5% chance and February only 15%. By March, optimism begins to build with a 38% likelihood of sun, but it is in April that the weather truly begins to brighten up. Interestingly, this month outshines both May and early summer's June, which stands at 31% and 53%, respectively. As winter gives way to spring, the trend clearly indicates that residents and visitors alike can expect a delightful increase in sunny opportunities as they step into April in the vibrant city of Helsinki.

Percentage of Sunny Days in April in Helsinki

The chart illustrates the percentage of sunny days in Helsinki throughout the year, with April 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 Helsinki experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec5%15%38%44%31%53%56%29%28%19%19%14%
Data source: Helsinki April chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Helsinki in April

As spring unfolds in Helsinki, April brings a delightful surge in daylight, boasting 14 hours of sunshine. Compared to the mere 6 hours in January, this shift marks a significant transition, with the days lengthening steadily throughout the months. Following March's 11 hours, the increase in daylight becomes not just noticeable but invigorating, offering locals and visitors alike a chance to bask in the longer, brighter days. This upward trend continues into May and June, where daylight peaks at an impressive 18 hours, providing the perfect backdrop for outdoor activities. As summer wanes into fall, daylight gradually diminishes, reminding us of the cyclical nature of seasons and the beauty of each transition.

Average Daylight Hours in Helsinki for April

The chart illustrates the variation in daylight duration in Helsinki throughout the year, with April highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec6h 45m9h 7m11h 51m14h 38m17h 14m18h 45m17h 56m15h 31m12h 48m10h 2m7h 27m5h 56m
Data source: Helsinki daylight hours, calculated by summing the hours between sunrise and sunset for each day.

April Winds in Helsinki

As April sweeps through Helsinki, residents experience a refreshing average wind speed of 4.1 m/s (9 mph), just slightly less brisk than the preceding month of March. The gentle winds signal the gradual transition into spring, reflecting a comfort that balances the lingering chill of winter against the warmth of the longer days ahead. Notably, this month’s winds fall in between the higher gusts of October (5.2 m/s) and the calmer summer months, illustrating a consistent ebb and flow in wind patterns throughout the year. As we move toward May, the winds may soften further, but April’s breezy charm remains a vital reminder of the ever-changing Finnish climate.

Average April Wind Speed in Helsinki

The chart displays monthly wind speed patterns in Helsinki, with values for each month shown alongside April's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how April's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.03.54.54.1 m/s3.73.03.54.44.15.24.44.2
Data source: Helsinki April wind data, generated using information from the Copernicus Climate Change Service.

How April Weather in Helsinki Compares to Other Months

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

In comparing the weather between April and January, it's clear that April brings a substantial increase in temperature, with averages rising from a chilly -3°C (28°F) in January to a more moderate 4°C (39°F). While January experiences bitterly cold lows of -23°C (-9°F), April's minimum temperature is significantly warmer at -12°C (10°F). Additionally, April sees less precipitation overall, with 48 mm (1.9 in) over 9 days compared to January's 55 mm (2.2 in) across 11 days. January also maintains a much higher humidity level at 97%, compared to April's 86%. For more detailed information on January's weather patterns, you can visit Helsinki weather in January.

April generally offers a milder climate compared to the much colder February. In April, temperatures range from a minimum of -12°C (10°F) to a pleasant maximum of 19°C (67°F), resulting in an average of 4°C (39°F). By contrast, February experiences much chillier weather, with temperatures dipping as low as -23°C (-8°F) and peaking at just 6°C (43°F), averaging -3°C (26°F). Both months see similar levels of precipitation, around 48 mm (1.9 in), but February tends to have slightly more rainy days at 10, compared to April's 9 days. Additionally, the humidity in February is higher at 95%, adding to the overall cold feel. For a detailed overview of February's weather specifics, visit Helsinki weather in February.

In comparing the weather of April to March, a notable increase in temperatures can be observed. April experiences a minimum temperature of -12°C (10°F) and an average of 4°C (39°F), which is significantly warmer than March's minimum of -22°C (-7°F) and average of -1°C (31°F). The maximum temperature in April reaches 19°C (67°F), offering more pleasant conditions for outdoor activities compared to March's maximum of 10°C (51°F).

Although April sees slightly less precipitation at 48 mm (1.9 in) over 9 days, compared to March's 52 mm (2.0 in) across 12 days, the humidity remains high in both months at 86% in April and 93% in March, contributing to a damp feel. For more detailed insights, refer to Helsinki weather in March.

April weather in Helsinki tends to be quite cool, with temperatures ranging from a minimum of -12°C (10°F) to a maximum of 19°C (67°F). The average temperature hovers around 4°C (39°F), and the month experiences about 48 mm (1.9 in) of precipitation over 9 days, along with high humidity at 86%. In contrast, May begins to warm up, with temperatures ranging from a minimum of -3°C (27°F) to a more comfortable maximum of 27°C (80°F), leading to an average temperature of 10°C (50°F). Precipitation in May increases slightly to 56 mm (2.2 in) and occurs over 10 days, but the humidity is notably lower at 75%. For a more detailed overview, check out Helsinki weather in May.

April weather in Helsinki is characterized by a significant chill, with temperatures ranging from a minimum of -12°C (10°F) to a maximum of 19°C (67°F). The average temperature sits at a brisk 4°C (39°F), alongside considerable humidity at 86%. Rainfall is moderate, with precipitation of 48 mm (1.9 in) spread over 9 days.

In contrast, June brings a much warmer climate, with temperatures ranging from a minimum of 3°C (38°F) to a pleasant maximum of 30°C (86°F) and an average of 16°C (62°F). The humidity decreases to 75%, creating a more comfortable atmosphere for outdoor activities. June sees slightly more precipitation at 61 mm (2.4 in), occurring over 10 days. For more details, you can check the Helsinki weather in June.

In April, the weather is still quite chilly, with temperatures ranging from a minimum of -12°C (10°F) to a maximum of 19°C (67°F), averaging around 4°C (39°F). The month experiences about 48 mm (1.9 in) of precipitation over 9 days, along with high humidity at 86%. In contrast, July brings much warmer conditions, with temperatures varying from a minimum of 8°C (46°F) to a maximum of 32°C (90°F) and an average of 18°C (65°F). Precipitation increases to 91 mm (3.6 in) over 13 days, while humidity slightly decreases to 80%. For more detailed insights on the warmth and conditions of July, visit Helsinki weather in July.

When comparing the weather in April and August, notable differences emerge. April sees cooler temperatures, with a minimum of -12°C (10°F) and an average of only 4°C (39°F), while August enjoys a milder climate, with temperatures ranging from a minimum of 7°C (45°F) to a maximum of 29°C (84°F). Precipitation also varies between the two months; April receives 48 mm (1.9 in) over 9 days, whereas August has a higher total of 83 mm (3.3 in) spread across 13 days. Despite this, humidity levels remain relatively high in both months, with April at 86% and August slightly lower at 83%. For more detailed information on August weather, visit Helsinki weather in August.

April and September present contrasting weather experiences. In April, temperatures range from a chilly -12°C (10°F) to a mild 19°C (67°F), with an average of 4°C (39°F). The month sees about 48 mm (1.9 in) of precipitation over roughly 9 days, coupled with high humidity at 86%. In comparison, September offers slightly warmer conditions, with temperatures ranging from -1°C (31°F) to a pleasant 23°C (73°F) and an average of 12°C (54°F). The month is wetter, with 76 mm (3.0 in) of precipitation over 13 days, and even higher humidity at 90%. For more detailed insights, check out Helsinki weather in September.

April and October in Helsinki reveal notable differences in weather patterns. April experiences a wider temperature range with minimums dipping to -12°C (10°F) and maximums reaching up to 19°C (67°F), while October’s temperatures range from a minimum of -4°C (25°F) to a maximum of 16°C (62°F). Precipitation also varies significantly; April sees 48 mm (1.9 in) over 9 days, whereas October is wetter, accumulating 89 mm (3.5 in) over 17 days. Additionally, October exhibits higher humidity levels at 93%, compared to April’s 86%. For a detailed look at what to expect, check out Helsinki weather in October.

April and November in Helsinki present contrasting weather conditions as spring transitions into winter. In April, temperatures range from a chilly -12°C (10°F) at night to a mild 19°C (67°F) during the day, with an average of 4°C (39°F). The month sees about 48 mm (1.9 in) of precipitation over approximately 9 days, with humidity levels around 86%. In comparison, November experiences slightly warmer temperatures, with a minimum of -7°C (19°F) and a maximum of 12°C (54°F), averaging 3°C (38°F). However, it is wetter, with 62 mm (2.5 in) of precipitation across around 13 days, and a higher humidity of 94%. For more details on the weather patterns, you can visit Helsinki weather in November.

April and December present quite contrasting weather conditions. In April, temperatures range from a chilly -12°C (10°F) at night to a pleasant 19°C (67°F) during the day, with an average of 4°C (39°F). Precipitation is moderate at 48 mm (1.9 in) over about 9 days, and humidity hovers around 86%, creating a crisp but occasionally rainy atmosphere. In contrast, December's weather is colder, with temperatures dipping as low as -18°C (0°F) and averaging around -1°C (31°F), peaking at just 7°C (44°F). The month sees increased precipitation, totaling 73 mm (2.9 in) across 15 days, and humidity rises to 95%, resulting in a much wetter and chillier feel. For more detailed insights, check out Helsinki weather in December.

Compare Helsinki's Climate with Cities Worldwide

Conclusion: What to Expect From April Weather in Helsinki

As April unfolds in Helsinki, the city begins to shake off the chill of winter, showcasing a blend of fluctuating temperatures and increasing daylight. While the average temperature hovers around a cool 4°C, occasional warm spells can push the mercury up to 19°C, offering a glimpse of spring's potential. However, it's not all sunshine, as the month sees around 9 days of precipitation and humidity levels high at 86%, keeping the atmosphere quite damp. This transitional month stands out compared to the deeper cold of winter, hinting at the arrival of milder weather ahead. To explore more about what to expect throughout the year, visit Helsinki Climate.