Weather in Idaho Falls

Planning your day in Idaho Falls? In this section, you will find the most up-to-date weather information, including detailed forecasts, to ensure your time spent here is as comfortable as possible.

The climate in Idaho Falls, USA, is characterised as continental with semi-arid features. This means there are four distinct seasons with noticeable temperature fluctuations throughout the year and relatively low rainfall levels.

Winters in Idaho Falls are cold, with average temperatures in January and December dropping below freezing (around -3.5°C to -3.9°C), and minimum temperatures reaching -7°C and lower. Summers, conversely, are warm and even hot, especially in July and August, when average temperatures exceed 22°C, and maximums can rise above 30°C. Spring and autumn are transitional seasons with moderate temperatures, gradually rising in spring and falling in autumn.

One of the notable features of the weather in Idaho Falls is the low amount of precipitation year-round, usually not exceeding 1-2 mm per month. The driest month is July, where precipitation is practically non-existent. Despite this, the number of days with precipitation (which may include light rain or snow in winter) varies from 2-5 days in the summer months to 10-13 days during other periods, indicating frequent but insignificant precipitation.

The climate in Idaho Falls is characterised by distinct seasons and significant temperature fluctuations throughout the year. The annual temperature range is quite wide: from freezing winter lows to hot summer highs. The hottest month is typically July, with an average temperature of 23.9°C and maximums reaching 32.2°C. The coldest months are January (average temperature -3.9°C, minimum -7.7°C) and December (average temperature -3.5°C, minimum -7.2°C). A characteristic feature of the local climate is the substantial difference between day and night temperatures throughout the year, which is particularly noticeable in the summer period.

Summer months in Idaho Falls, especially June, July, and August, offer warm and often hot weather. In July, daytime air temperatures regularly rise above 30°C, creating conditions for true summer heat. June and August are also quite warm, with maximum temperatures in the range of 26-30°C. However, nights bring pleasant coolness: temperatures can drop to 11-15°C, providing a comfortable rest after a hot day. Daily temperature fluctuations in summer can be quite significant, reaching 15-16 degrees.

Winter in Idaho Falls, spanning from December to February, is quite cold and frosty. Average temperatures during these months stay below freezing: around -3.9°C in January and -2.9°C in February. At night, the thermometer regularly drops to -7°C and below. Even daytime maximum temperatures in the height of winter (January, December) barely reach 0°C or remain slightly below zero. The transitional seasons, spring and autumn, are characterised by gradual temperature changes, with April and October showing moderate average values (7.1°C and 8.8°C respectively), but with noticeable daily fluctuations remaining.

Idaho Falls experiences a relatively arid climate, and the amount of precipitation throughout the year is low. There is no distinct rainy season here, although periods with slightly more or fewer wet days can be identified. Overall, precipitation is distributed throughout the year, but its intensity and frequency vary.

The highest amount of precipitation, albeit modest, usually falls in March and May, when an average of 2 mm is recorded. May also stands out as the month with the highest number of wet days — around 13. On the other hand, July is the driest month of the year, with practically no precipitation (0 mm) and just a couple of days when it is possible. Summer precipitation, if it occurs, falls as rain.

In winter, from December to February, as well as in transitional months like November and partly March, average temperatures often drop below freezing. This means that precipitation during this period mainly falls as snow. For example, in January and December, there are about 10-11 days with precipitation. In spring and autumn, precipitation most often takes the form of rain. Summer, especially July and August, is characterised by the lowest probability of precipitation, with 2-4 wet days per month.

When planning a trip to Idaho Falls, it is important to consider the significant temperature fluctuations throughout the year. The principle of layering clothing will be your best friend. In winter (from December to February), average temperatures drop below freezing, often to -7°C, so warm items are necessary: thermal underwear, fleece jumpers, an insulated waterproof jacket, a hat, gloves, and a scarf. In spring (from March to May), the weather gradually warms up, but frosts are still possible, especially at the beginning of the season. It is recommended to bring jumpers, a light jacket, and a raincoat or umbrella, as the number of rainy days increases, particularly in May.

Summer (from June to August) in Idaho Falls is warm and sunny, with average temperatures reaching 24°C, and maximums potentially exceeding 30°C. During this period, you will need light clothing, T-shirts, shorts, and sandals. Don't forget sunscreen, a hat, and sunglasses. Precipitation in summer is minimal, but a light cardigan or windbreaker will come in handy for evening walks. In autumn (from September to November), the temperature begins to drop again, returning to cool weather. It can still be quite warm in September, but by November, frosts are possible. Pack jeans, jumpers, and a mid-season jacket. Regardless of the season, comfortable walking shoes are a must, as you will surely want to explore the city and its surroundings.