Weather in Sioux Falls

To ensure your trip to Sioux Falls is as comfortable as possible, it is important to find out about the weather conditions in advance. In this section, you will find up-to-date weather reports, detailed charts, and forecasts for the near future.

The climate of Sioux Falls can be characterised as continental, with distinct seasonal changes. The weather here is quite diverse: from frosty winters to truly hot summers, allowing tourists to plan various types of holidays depending on the season. Overall, the region is characterised by significant temperature contrasts throughout the year.

Winter here is cold, with temperatures often dropping below -10°C, especially in January and February, so warm clothing will be absolutely essential. Summer, on the other hand, delights with warmth and sunshine: in July and August, the air often warms up to +28...+29°C, creating excellent conditions for walks near the famous waterfalls and in city parks. The transition seasons pass quite dynamically, with rapid warming in spring and gradual cooling in autumn.

When planning a trip, it is worth noting that late spring and early summer are the wettest periods. May and June are distinguished by the highest number of rainy days (up to 13 days per month), while the winter months, despite the cold, are characterised by less precipitation. This weather pattern makes Sioux Falls a classic example of a city with four clearly distinguishable seasons.

The climate in the city of Sioux Falls is characterised by pronounced seasonality with a significant temperature range throughout the year. The coldest month is traditionally January, when the average temperature drops to -7.0°C, and night frosts can reach -11.1°C. At the opposite pole is July — the peak of summer heat, when the air warms up to an average of 23.8°C, and daytime highs often approach the 29.1°C mark.

The winter period in this US region is truly frosty and long. From December to February, average thermometer readings stay consistently below zero, requiring travellers to have warm clothing. Summer, conversely, brings comfortable warmth without extreme heat. Between June and August, the daytime temperature holds steadily in the 27–29°C range, creating excellent conditions for tourism and outdoor recreation.

When planning a trip, one should also consider noticeable daily temperature fluctuations, which are especially palpable during the warm season. Even on the hottest summer days, when the sun warms the air to high values, the nights bring pleasant freshness and coolness: temperatures can drop to 17–18°C. Such a difference makes evenings in Sioux Falls very comfortable, allowing you to take a break from the daytime heat.

Precipitation in Sioux Falls is distributed unevenly throughout the year, clearly following seasonal changes. The winter months, from December to February, are characterised by sub-zero temperatures, so moisture falls mainly as snow. This is the "driest" period of the year: the number of days with precipitation is minimal, averaging 5–6 days per month.

With the arrival of warmth, the situation changes, and spring brings the rainy season. The wettest month is May, when about 13 rainy days are recorded and the highest amount of precipitation falls. April and June are also distinguished by high humidity, so travellers planning a trip at this time are advised to carry an umbrella and waterproof shoes.

In the second half of summer and early autumn, the frequency of precipitation gradually decreases. While it rains quite often in June, by September and October the number of wet days drops to 7 per month. November marks the transition to the winter regime, becoming one of the most stable months before the snowfall begins.

The climate in Sioux Falls features distinct seasonality, so the contents of your suitcase will depend directly on your travel dates. If you plan a visit in winter, be prepared for serious cold: temperatures can drop to -11°C. Be sure to take warm thermal underwear, a thick down jacket, a hat, a scarf, and gloves. Insulated waterproof shoes with non-slip soles will be a necessity for comfortable walks on snowy streets.

Summer, on the other hand, delights with warmth and sunny days, when the thermometer often rises to 29°C. For a trip in June, July, or August, choose light clothing made from natural breathable fabrics. Do not forget sun protection: quality sunglasses, headwear, and SPF cream are mandatory. Comfortable trainers or sandals will come in handy for long walks in parks and sightseeing.

Spring and autumn can be quite unpredictable, and May and June often bring the highest number of rainy days. In the off-season, it is best to stick to the principle of layering: a combination of a t-shirt, sweater, and light windbreaker will allow you to quickly adapt to temperature changes throughout the day. We also strongly recommend bringing a compact umbrella or raincoat so that sudden precipitation does not spoil your plans.