Porvoo

Planning a stroll through Porvoo or organizing your day? Here you’ll find the most up-to-date weather information, including detailed forecasts and clear charts.

The climate in Porvoo, Finland, is classified as humid continental with four distinct seasons. Winters here are cold, with average monthly temperatures well below freezing, particularly in January and February when the thermometer can drop to -6°C or lower. In contrast, summer offers pleasant, moderately warm weather, peaking in July and August when averages reach +17-18°C and highs can exceed +20°C. Spring and autumn are classic transitional seasons with gradual changes in temperature.

One interesting feature of the weather in Porvoo is the low total precipitation throughout the year, typically around 2-3 mm per month. However, despite this, the number of "wet days"—days with some form of precipitation—is quite high, ranging from 10 to 16 days each month. This indicates that precipitation, whether snow in winter or rain in the warmer months, is most often light and brief rather than heavy downpours. Therefore, when planning your trip, it’s wise to be prepared for frequent but light precipitation at any time of year.

The climate in Porvoo features distinct seasonal temperature changes. The coldest month of the year is usually February, with an average temperature of about -4.0°C. During this time, night temperatures can drop to an average of -6.5°C, and daytime highs rarely rise above -1.4°C. January is also frosty, with an average temperature of -3.8°C. In contrast, the warmest month is July, when the average temperature reaches a comfortable 17.8°C. In July, daytime highs average around 21.8°C, while night minimums stay at 13.8°C.

The summer period in Porvoo, lasting from June to August, offers pleasantly warm weather, ideal for exploring the city and its surroundings. In June, the average air temperature is 16.5°C, peaking in July (17.8°C) and decreasing slightly in August to 17.0°C. During the day, the thermometer usually reads between 20°C and 22°C. Nights in the summer months remain cool, with temperatures ranging from 11.9°C to 13.8°C, so light outerwear may be useful. The difference between day and night temperatures in summer is more noticeable than in winter, averaging 7-9°C.

Winter in Porvoo, spanning from December to February, is frosty and snowy. Average temperatures during this period remain steadily below freezing: -1.9°C in December, -3.8°C in January, and -4.0°C in February. Daytime highs rarely rise above freezing, and night temperatures regularly drop to between -3.7°C and -6.5°C. The transitional seasons—spring and autumn—show gradual temperature changes. In spring, especially in April (average 4.3°C) and May (average 10.8°C), there is a noticeable warming. In autumn, from September (12.2°C) to November (2.1°C), the temperature gradually decreases, preparing the city for the arrival of winter.

In Porvoo, precipitation is distributed relatively evenly throughout the year, with no pronounced rainy season or dry period in terms of total volume. A small amount of precipitation falls each month, typically around 2 mm, with a slight increase to 3 mm in August. This suggests that even on days with precipitation, it is usually very light.

The winter months, from December to March, are characterized mainly by snowfall, as average temperatures during this period typically fall below freezing. January and December are the months with the highest number of days with precipitation—about 16 each. In February and March, the number of such days decreases slightly to around 11. Given the low total precipitation, these are likely frequent but light snowfalls or snow dustings.

With the arrival of warmer weather, from approximately April to October, precipitation falls as rain. April, May, and June have the fewest days with precipitation—about 10 each. In July, August, September, and October, the number of rainy days increases slightly, peaking at 14 days in July and October. As in the winter, rain is usually light, often appearing as drizzle or brief light showers. November also brings precipitation, mostly as rain, though sleet is possible as temperatures drop; this month sees about 13 days of precipitation.

When planning a trip to Porvoo, it's important to consider the changeable Finnish weather. Layering should be your key packing principle, as temperatures can shift throughout the day. Regardless of the season, comfortable waterproof shoes for walking the city's charming streets will be your best friend. Also, don’t forget an umbrella or a raincoat, as precipitation, though light in volume, occurs quite frequently year-round.

In winter (December to March), Porvoo is cold, with average temperatures around -4°C and nights dropping to -6.5°C. You will need very warm clothes: thermal layers, wool sweaters, an insulated windproof and waterproof jacket, a hat, scarf, and gloves. In summer (June to August), the weather is much more pleasant, with average temperatures around 17°C and highs of 21-22°C. Pack light clothing, T-shirts, and shorts or light trousers, but don’t forget a sweater or a light jacket for the evenings or cooler days. Sunscreen and a hat will also come in handy on sunny summer days.

Spring (April-May) and autumn (September-November) are transitional seasons. In April and May, temperatures gradually rise from cool to moderate, while in autumn, it begins to cool down. Layered clothing is ideal for these periods: T-shirts, long-sleeved shirts, sweaters, and a mid-season jacket (preferably windproof and waterproof). Given the significant number of days with precipitation, especially in October, November, December, and January, waterproof outerwear and footwear will be particularly useful.