Weather in South Portland

Planning your day in the city of South Portland? Here you will find the latest weather updates. Check the current data and forecasts to ensure nothing interrupts your plans.

The city of South Portland features a temperate climate with four clearly defined seasons. This means the weather here changes significantly throughout the year. Travellers can look forward to cold winters, when the average temperature drops below freezing, and warm, comfortable summers. The hottest months are July and August, with an average temperature of around 21°C, which is ideal for walking and outdoor activities.

Precipitation in South Portland is distributed quite evenly throughout the year, with no distinct rainy or dry season. On average, there are between 8 and 12 days with precipitation each month. This suggests that light rain is possible at any time of the year, so it is worth carrying an umbrella or raincoat, regardless of the season of your trip.

The climate in the city of South Portland is characterised by distinct seasons with significant temperature contrasts throughout the year. Winter here is cold and frosty, especially in January and February. During these months, the average air temperature stays below freezing (around -2.4°C and -1.6°C respectively), and night-time temperatures regularly drop to -5°C and below. Summer, on the other hand, is very comfortable and warm, but not exhaustingly hot. The warmest months are July and August, when the average temperature is a pleasant 21°C, and daily highs reach a comfortable 24-25°C.

Spring and autumn in South Portland are transitional periods with a gradual change in temperatures. In spring, from March to May, the weather gradually warms up from a cool +2°C to a moderate +13°C. In autumn, the reverse process occurs: while September still retains summer warmth with an average temperature of about 18°C, by November it drops to +5.6°C, heralding the arrival of winter. Diurnal temperature fluctuations are moderate; the difference between daily highs and nightly lows usually does not exceed 7-10 degrees, ensuring relatively stable weather throughout the day.

In the city of South Portland, precipitation is distributed quite evenly throughout the year, and there is no clearly defined dry or rainy season. The number of days with precipitation in each month is fairly stable, ranging from 8 to 12, which means the likelihood of rain or snow exists practically always. When planning a trip, it is worth taking an umbrella or a waterproof jacket regardless of the time of year.

The nature of the precipitation depends directly on the season. In winter, from December to February, freezing temperatures turn precipitation into snow. In spring and summer, it is generally rain. The highest number of days with precipitation falls in April and June — about 12 days in each month. This indicates frequent, but likely not too intense, rains during this period.

If we consider the volume of precipitation, the wettest month is December (5 mm), and the driest is May (2 mm). At the same time, September is distinguished by the fewest number of rainy days — on average only 8. Despite these small fluctuations, the overall picture remains unchanged: South Portland is a city with moderate but regular humidity all year round.

When planning a trip to South Portland, it is important to consider its four distinct seasons. The best strategy when packing your suitcase will be the principle of layering. The weather here can be changeable, especially in the off-season, so the ability to remove or put on an extra layer of clothing will make your stay comfortable. Regardless of the time of year, be sure to bring comfortable walking shoes, as you will surely want to explore the city and its picturesque surroundings on foot.

In summer, from June to August, warm and pleasant weather settles in South Portland. You will need t-shirts, shorts, light dresses, and sandals. However, evenings can be cool, especially by the water, so a light jacket, sweater, or cardigan will be very useful. Do not forget sunscreen and a hat. In spring (April-May) and autumn (September-October), the weather is more unpredictable. During this period, jeans, long-sleeved t-shirts, sweaters, and a waterproof windbreaker or light coat are ideal. Since there are about 10-12 rainy days per month on average, a compact umbrella will also not go amiss.

Winter, from December to February, in South Portland is cold, with average temperatures below freezing. For a trip at this time of year, you will need a complete winter wardrobe: a warm waterproof jacket or down jacket, thermal underwear, warm sweaters, as well as a hat, a scarf, and gloves. Pay special attention to footwear — it should be not only warm but also waterproof to protect your feet from snow and slush, which are likely on rainy winter days.