May weather forecast
Idaho, USA

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Flag of Idaho, USA
Flag of Idaho, USA

Weather in May

In May, Idaho fully embraces spring with all its vivacity, shedding the last remnants of winter and preparing for the warmth of the approaching summer. The state pulsates with life, and the transformations are evident in both urban and natural landscapes.

Mountainous regions, including the likes of the White Cloud Mountains, undergo a significant change. While some snow can still be found at the highest peaks, most of the mountain slopes are now free from their wintry shroud. Meadows in these high altitudes burst forth with wildflowers, painting vibrant swaths of color against the green backdrop.

In urban areas such as Boise, temperatures climb further, typically hovering from the high 50s°F to mid 60s°F. This is warmer than April, making it more conducive for outdoor activities and heralding the beginning of various festivals and events across the state.

Transitioning into June, one can expect even warmer temperatures and longer days, a prelude to the full bloom of summer. While May is largely warm, it isn't immune to occasional dips in temperature, especially during nighttime or in the shaded valleys.

The sky in May, especially in western parts influenced by the Pacific, is predominantly clear but interspersed with occasional rain showers. These showers, while nourishing the flora, are usually short-lived and are followed by stretches of sunshine. The frequency of rain, though, is less than in April.

River levels, especially those like the Salmon and Payette, remain high due to the residual melting of snow from higher terrains. This makes May an excellent time for river-based activities such as rafting or fishing.

  • Boise - May »
    On the last day of the month, in Boise, sunrise is at 6:06 am and sunset at 9:18 pm MDT. In Boise snow does not fall in May through October.
  • Meridian - May »
    In Meridian snow does not fall in April through October. Entering May, Meridian sees a temperature rise, with the average high-temperature advancing from April's moderate 59.5°F (15.3°C) to a pleasant 69.3°F (20.7°C).
  • Nampa - May »
    On the last day of the month, in Nampa, sunrise is at 6:08 am and sunset at 9:19 pm MDT. On the first day of May in Nampa, sunrise is at 6:38 am and sunset at 8:48 pm.
  • Idaho Falls - May »
    During 0.3 snowfall days, in May, Idaho Falls aggregates 0.59" (15mm) of snow. During 0.3 snowfall days, in May, Idaho Falls aggregates 0.59" (15mm) of snow.
  • Pocatello - May »
    In Pocatello in May, it is raining for 12.3 days, with typically 1.18" (30mm) of accumulated precipitation. Throughout the year, in Pocatello, there are 70.2 snowfall days, and 31.61" (803mm) of snow is accumulated.
  • Caldwell - May »
    In Caldwell, in May, during 9.9 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. In Caldwell, in May, during 9.9 rainfall days, 0.98" (25mm) of precipitation is typically accumulated.
  • Coeur d'Alene - May »
    In Coeur d'Alene, during May, the rain falls for 13.3 days and regularly aggregates up to 1.97" (50mm) of precipitation. In Coeur d'Alene, during the entire year, snow falls for 71.6 days and aggregates up to 56.26" (1429mm) of snow.
  • Twin Falls - May »
    On the first day of May in Twin Falls, Idaho, sunrise is at 6:32 am and sunset at 8:37 pm. In Twin Falls, in May, during 9.7 rainfall days, 0.75" (19mm) of precipitation is typically accumulated.
  • Lewiston - May »
    In Lewiston in May, during 13.6 rainfall days, 1.42" (36mm) of precipitation is typically accumulated. In Lewiston in May, during 13.6 rainfall days, 1.42" (36mm) of precipitation is typically accumulated.
  • Post Falls - May »
    In Post Falls during May, the rain falls for 13.3 days and regularly aggregates up to 1.77" (45mm) of precipitation. During 0.4 snowfall days, in May, Post Falls aggregates 0.08" (2mm) of snow.
  • Rexburg - May »
    On the first day of May in Rexburg sunrise is at 6:18 am and sunset at 8:29 pm. During 0.6 snowfall days, in May, Rexburg aggregates 0.67" (17mm) of snow.
  • Moscow - May »
    In Moscow, during the entire year, snow falls for 60.2 days and aggregates up to 47.24" (1200mm) of snow. In Moscow, Idaho, in May, it is raining for 16.2 days, with typically 2.28" (58mm) of accumulated precipitation.
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Idaho, USA

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