Climate and monthly weather forecastSeinäjoki, Finland
Climate and monthly weather forecast
The climate of Seinäjoki
Seinäjoki, a city in Finland, follows the Köppen climate classification Dfc, indicating a predominant Subarctic climate with severe winters, no dry season, and cool summers. This geographical location significantly influences the city's climate, with wide-ranging fluctuations observable across various weather parameters throughout the year.The city experiences a high variation in temperature, oscillating from a lowest average temperature of -8.8°C (16.2°F) in January to a highest average of 21.4°C (70.5°F) in July. A substantial change is also noted in the relative humidity, starting from 67% in May shifting upwards to 94% in the colder months of January and February. Rainfall displays a diverse pattern with the maximum precipitation of 62mm (2.44") occurring in August, though the number of rainfall days peaks in the same month at 18.1 days.
Paralleling the rainfall, snowfall in Seinäjoki follows a similar distribution, with no snowfall from June to September, gradually increases towards the end of the year, reaching a yearly high of 145mm (5.71") in December. The aforementioned data provides a clear picture of distinctive weather patterns within the city influenced by its Subarctic climatic conditions.
The best time to visit Seinäjoki
Based on the weather parameters outlined, the most favorable time to visit Seinäjoki would seemingly be between May and August. During this period, the city experiences relatively warm temperatures ranging from 14.5°C (58.1°F) to 21.4°C (70.5°F), lower relative humidity levels around 67% to 72%, and longer daylight hours up to 20 hours in June.Although rainfall during these months does increase, it's accompanied by a higher number of sunshine hours, which peaks at 12 hours in June, and a decrease in cloud cover percentage, dropping to 43% in June, indicative of clearer skies. This time frame also avoids the heavy snowfall and extreme cold characteristic of the winter months.
The worst time to visit Seinäjoki
The least favorable time for tourists to visit Seinäjoki spans from November to February. During this period, temperature averages drop significantly, plummeting to as low as -8.8°C (16.2°F) in January. These months also see a remarkable increase in snowfall with December witnessing a high of 145mm (5.71") of snow.The relative humidity during these months ascends to around 91%-94%, and the average daylight spans a mere 6.1 hours in December. In addition to these factors, the pressure deviation is most significant in December, dropping to 1006mb, coupled with an average wind speed peaking at 12.1km/h (7.5mph) in December, emphasizing the intense weather conditions during this timeframe.
Spring weather in Seinäjoki
During the Spring months from March to May, Seinäjoki undergoes a gradual transition from its frigid winter conditions. The temperatures experience a notable increase moving from -0.1°C (31.8°F) in March to 14.5°C (58.1°F) in May. Precipitation during this period ranges from 23mm (0.91") in March to a high of 41mm (1.61") in May, with the number of rainfall days ascending from 5.3 days to 14.2 days, respectively.Simultaneously, a substantial decrease in snowfall from 115mm (4.53") in March to no snowfall from May forwards is observed. The longer daylight hours ranging from 11.8 hours in March to 18 hours in May and increasing visibility from 6km (3.7mi) in March to 9km (5.6mi) in May, signifies the onset of the mild and comfortable weather.
Summer weather in Seinäjoki
Seinäjoki witnesses its warmest conditions during the Summer months of June to August, with an average high temperature of around 19.6°C (67.3°F) to 21.4°C (70.5°F). The level of humidity remains relatively stable around 67% to 72%, and the amount of rainfall becomes prominent with a peak at 62mm (2.44") in August.A noteworthy aspect of Seinäjoki's Summer is the long daylight hours, peaking at 20 hours in June declining to 16.1 hours in August. Simultaneously, there are high sunshine hours going from 12 hours in June to 9.5 hours in August, and a UV index reaching its annual high at 5 in July. The absence of snowfall reflects the season's mildness, making it a favorable time for outdoor activities.
Autumn weather in Seinäjoki
The Autumn months from September to November in Seinäjoki are marked by falling temperatures, from 14.5°C (58.1°F) in September and dipping to 2°C (35.6°F) in November. Accompanying this, the amount of rainfall sees a diminishing pattern from 33mm (1.3") to 37mm (1.46"), with a slight decrease in rainfall days from 15 to 13.Concurrently, snowfall begins to make its appearance with 27mm (1.06") recorded in October, escalating to 73mm (2.87") in November. Despite this initial snowfall, daylight hours, which drop from 13 hours in September to 6.9 hours in November, and the reduced sunshine hours from 6.9 hours to 2.5 hours, continue to provide fair visibility.
Winter weather in Seinäjoki
Winter in Seinäjoki, occurring from December to February, is distinguished by its extremely low temperatures, ranging from -2°C (28.4°F) to -4.5°C (23.9°F). At the same time, the relative humidity climbs strikingly from 92% to 94%. It's during this period that snowfall is at its peak, reaching up to 145mm (5.71") in December, concomitant with an average of 16.3 snowfall days.Additionally, daylight reduces to its annual minimum of 5 hours in December, hindering visibility. Coupled with heightened wind speeds reaching up to 12.1km/h (7.5mph) in December. This season characterizes the severity of a Subarctic winter, typifying the rugged beauty of Seinäjoki during the harshest months.
Weather in January
Seinäjoki, Finland endures a chilly start to the calendar year in January. The plummeting mercury paints a picture of winter, repainting landscapes with crystallized snow. Wintry woes continue to prevail as snowfall of 139mm (5.47") engulfs the city. Weather in January »Weather in February
February in Seinäjoki continues the cold trend set in January. Grey skies envelop the city contributed by a cloud cover of 74%. However, there's a noticeable reduction in snowfall, inviting a slightly warmer atmosphere. Natural daylight starts to breach through the persistent overcast, increasing the sunlight hours, paving the way for spring. Weather in February »Weather in March
March in Seinäjoki marks the advent of spring amidst lingering traces of winter. Erratic weather patterns dominate, induced by a declining snowfall count and a temperature that hovers around sub-zero degrees. A marginal increase in sunshine hours becomes noticeable, aspiring to warm the frozen landscapes. Weather in March »Weather in April
April brings with it the warmthes of spring in Seinäjoki, Finland. A remarkable respite from the intense cold is evident as the mercury levels rise, offering a pleasant contrast to the preceding months. Daylight hours shoot up significantly, making the days brighter and longer. Weather in April »Weather in May
May unveils the Finnish summer in Seinäjoki, characterized by pleasantly high temperatures and prolonged sunshine. Rainfall gets frequent with an average monthly downpour of 41mm (1.61"). As the days unfold, boisterous winds make their way out, resulting in warm, tranquil evenings. Weather in May »Weather in June
June in Seinäjoki can be called the threshold to peak summer. This period offers the longest daylight hours of up to 20 hours paving the way for leisurely afternoons. The city also revels under a maximum number of sunshine hours keeping the weather sunny and bright. Weather in June »Weather in July
July in Seinäjoki manifests classic summer temperatures with an average high of 21.4°C (70.5°F). The city witnesses a spike in rainfall during this month, a pattern typical of summer. Barring the periodic rain showers, the humidity levels drop, making the air cooler and refreshing. Weather in July »Weather in August
August in Seinäjoki indicates the onset of a post-summer phase. The city experiences a significant downpour with an average of 62mm (2.44") rainfall, the highest at any time of the year. Despite high rainfall days, the temperature holds firm, presenting a contrast to the damp conditions. Weather in August »Weather in September
September in Seinäjoki marks the transition of seasons, bringing early signs of autumn. Milder temperatures become prominent, announcing the departure of summer. Sunlight hours gradually reduce, bringing in early evenings. A decrease in pressure can be observed, a precursor to the approaching colder months. Weather in September »Weather in October
October sets in with autumnal hues in Seinäjoki. A noticeable drop in temperature signals the arrival of colder days. Snowfall makes a comeback after a prolonged summer hiatus, albeit in a mild amount of 27mm (1.06"). The prevalence of clouds begins to increase, diminishing the sunlight hours. Weather in October »Weather in November
November in Seinäjoki is a prelude to the Finnish winter. A substantial fall in temperature is accompanied by an average snowfall of 73mm (2.87"). Shorter, colder days start setting in, contrasting with the sun-soaked summer afternoons. Weather in November »Weather in December
December in Seinäjoki marks the beginning of a long, severe winter. The climate takes a polar plunge as the temperature dips considerably, inundating the city with an average snowfall of 145mm (5.71"), a high not seen in any other month. Weather in December »Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Temperature readings in Seinäjoki reach their annual highs in January, averaging -4.5°C (23.9°F) and a minimum average of -8.8°C (16.2°F).
January and February, with an average relative humidity of 94%, are most humid months in Seinäjoki.
In Seinäjoki, during the entire year, the rain falls for 134.7 days and collects up to 432mm (17.01") of precipitation.
Months with snowfall are January through May, October through December.
Throughout the year, there are 79 snowfall days, and 691mm (27.2") of snow is accumulated.
The months with the lowest UV index in Seinäjoki are January through March, November and December, with an average maximum UV index of 1.
The month with the least rainfall is February, when the rain falls for 3.1 days and typically collects 20mm (0.79") of precipitation.
May and June, with an average relative humidity of 67%, are the least humid months.
June through September are months without snowfall in Seinäjoki.
The month with the longest days is June, with an average of 20h and 0min of daylight.
June has the most sunshine of the year in Seinäjoki, with an average of 12h of sunshine.
Seinäjoki witnesses the warmest weather in July, with temperatures averaging a high of 21.4°C (70.5°F) and a low of 11.8°C (53.2°F).
With an average maximum UV index of 5, July is the month with the highest UV index in Seinäjoki.
The month with the most rainfall in Seinäjoki, Finland, is August, when the rain falls for 18.1 days and typically aggregates up to 62mm (2.44") of precipitation.
On Sunday, 27. October 2024, at 04:00, Daylight Saving Time ends, and the time zone changes from EEST to EET. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 03:00, and the time zone reverts from EET to EEST.
December is the month with the most snowfall. Snow falls for 16.3 days and accumulates 145mm (5.71") of snow.
With an average of 5h and 0min of daylight, December has the shortest days of the year.
With an average of 1.1h of sunshine, December has the least sunshine of the year.
Average temperature
Seinäjoki, Finland
The warmest month (with the highest average high temperature) is July (21.4°C).
The month with the lowest average high temperature is January (-4.5°C).
The month with the highest average low temperature is July (11.8°C).
The coldest month (with the lowest average low temperature) is January (-8.8°C).
Average pressure
Seinäjoki, Finland
- Average pressure in January:
1010mbar - Average pressure in February:
1010.5mbar - Average pressure in March:
1009.4mbar - Average pressure in April:
1012.4mbar - Average pressure in May:
1014.3mbar - Average pressure in June:
1011.5mbar
- Average pressure in July:
1010.6mbar - Average pressure in August:
1011.9mbar - Average pressure in September:
1012mbar - Average pressure in October:
1012.5mbar - Average pressure in November:
1010.1mbar - Average pressure in December:
1006mbar
The month with the highest atmospheric pressure is May (1014.3mbar).
The month with the lowest atmospheric pressure is December (1006mbar).
Average wind speed
Seinäjoki, Finland
- Average wind speed in January:
11.7km/h - Average wind speed in February:
11.8km/h - Average wind speed in March:
11.9km/h - Average wind speed in April:
10.9km/h - Average wind speed in May:
10.9km/h - Average wind speed in June:
10.5km/h
- Average wind speed in July:
9.7km/h - Average wind speed in August:
9.9km/h - Average wind speed in September:
10.6km/h - Average wind speed in October:
10.9km/h - Average wind speed in November:
11.4km/h - Average wind speed in December:
12.1km/h
The windiest month (with the highest average wind speed) is December (12.1km/h).
The calmest month (with the lowest average wind speed) is July (9.7km/h).
Average humidity
Seinäjoki, Finland
The months with the highest relative humidity are January and February (94%).
The months with the lowest relative humidity are May and June (67%).
Average rainfall
Seinäjoki, Finland
The wettest month (with the highest rainfall) is August (62mm).
The driest month (with the least rainfall) is February (20mm).
Average rainfall days
Seinäjoki, Finland
- Average rainfall days in January:
3.3 days - Average rainfall days in February:
3.1 days - Average rainfall days in March:
5.3 days - Average rainfall days in April:
11.9 days - Average rainfall days in May:
14.2 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
16.5 days - Average rainfall days in August:
18.1 days - Average rainfall days in September:
15 days - Average rainfall days in October:
12.8 days - Average rainfall days in November:
13 days - Average rainfall days in December:
6.7 days
The month with the highest number of rainy days is August (18.1 days).
The month with the least rainy days is February (3.1 days).
Average snowfall
Seinäjoki, Finland
- Average snowfall in January:
139mm - Average snowfall in February:
104mm - Average snowfall in March:
115mm - Average snowfall in April:
66mm - Average snowfall in May:
22mm - Average snowfall in June:
0mm
The month with the highest snowfall is December (145mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days
Seinäjoki, Finland
- Average snowfall days in January:
15.4 days - Average snowfall days in February:
12.4 days - Average snowfall days in March:
15.3 days - Average snowfall days in April:
6.3 days - Average snowfall days in May:
1 days - Average snowfall days in June:
0.1 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
3.7 days - Average snowfall days in November:
8.5 days - Average snowfall days in December:
16.3 days
The month with the highest number of snowfall days is December (16.3 days).
The months with the least snowfall days are July, August and September (0 days).
Average daylight / Average sunshine
Seinäjoki, Finland
- Average daylight in January:
6h and 6min - Average daylight in February:
8h and 48min - Average daylight in March:
11h and 48min - Average daylight in April:
14h and 54min - Average daylight in May:
18h and 0min - Average daylight in June:
20h and 0min
- Average daylight in July:
18h and 54min - Average daylight in August:
16h and 6min - Average daylight in September:
13h and 0min - Average daylight in October:
9h and 54min - Average daylight in November:
6h and 54min - Average daylight in December:
5h and 0min
The month with the longest days is June (Average daylight: 20h and 0min).
The month with the shortest days is December (Average daylight: 5h and 0min).
- Average sunshine in January:
1h and 48min - Average sunshine in February:
2h and 42min - Average sunshine in March:
3h and 54min - Average sunshine in April:
6h and 12min - Average sunshine in May:
9h and 54min - Average sunshine in June:
12h and 0min
- Average sunshine in July:
11h and 18min - Average sunshine in August:
9h and 30min - Average sunshine in September:
6h and 54min - Average sunshine in October:
4h and 6min - Average sunshine in November:
2h and 30min - Average sunshine in December:
1h and 6min
The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 1h and 6min).
Average sunshine days
Seinäjoki, Finland
- Average sunshine days in January:
14.7 days - Average sunshine days in February:
15 days - Average sunshine days in March:
12.3 days - Average sunshine days in April:
12 days - Average sunshine days in May:
14.8 days - Average sunshine days in June:
13.3 days
- Average sunshine days in July:
11.4 days - Average sunshine days in August:
11 days - Average sunshine days in September:
11.3 days - Average sunshine days in October:
13.2 days - Average sunshine days in November:
10.4 days - Average sunshine days in December:
11.1 days
The month with the most sunshine days is February (15 days).
The month with the least sunshine days is November (10.4 days).
Average UV index
Seinäjoki, Finland
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover
Seinäjoki, Finland
The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is June (Cloud cover 43).
Average visibility
Seinäjoki, Finland
The months with the highest visibility are May, June and July (9km).
The months with the lowest visibility are January, February and March (6km).
