May weather forecast
Idaho, USA

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.

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• Boise - May »
  In Boise during the entire year, the rain falls for 116.8 days and collects up to 15.08" (383mm) of precipitation. On the first day of May in Boise sunrise is at 6:35 am and sunset at 8:47 pm.
• Meridian - May »
  In Meridian snow does not fall in April through October. In Meridian, snow does not fall in April through October.
• Nampa - May »
  On the last day of the month, in Nampa, Idaho, sunrise is at 6:07 am and sunset at 9:20 pm MDT. In Nampa, during May, the rain falls for 9.4 days and regularly aggregates up to 0.87" (22mm) of precipitation.
• Idaho Falls - May »
  On the last day of the month, in Idaho Falls sunrise is at 5:50 am and sunset at 9:01 pm MDT. During 0.3 snowfall days, in May, Idaho Falls aggregates 0.59" (15mm) of snow.
• Pocatello - May »
  In Pocatello during the entire year, the rain falls for 116.1 days and collects up to 11.26" (286mm) of precipitation. In Pocatello, during May, the rain falls for 12.3 days and regularly aggregates up to 1.18" (30mm) of precipitation.
• Caldwell - May »
  In Caldwell during May, the rain falls for 9.9 days and regularly aggregates up to 0.98" (25mm) of precipitation. In Caldwell, during May, the rain falls for 9.9 days and regularly aggregates up to 0.98" (25mm) of precipitation.
• Coeur d'Alene - May »
  On the last day of the month, in Coeur d'Alene sunrise is at 4:53 am and sunset at 8:36 pm PDT. May is the last month it regularly snows in Coeur d'Alene, Idaho.
• Twin Falls - May »
  In Twin Falls snow does not fall in May through September. On the first day of May in Twin Falls sunrise is at 6:31 am and sunset at 8:38 pm.
• Lewiston - May »
  As April transitions into May in Lewiston, a subtle temperature shift is observed, with average highs adjusting from a mild 56.1°F (13.4°C) to a still refreshing 65.1°F (18.4°C). In Lewiston, in May, during 13.6 rainfall days, 1.42" (36mm) of precipitation is typically accumulated.
• Post Falls - May »
  During 0.4 snowfall days, in May, Post Falls aggregates 0.08" (2mm) of snow. During 0.4 snowfall days, in May, Post Falls aggregates 0.08" (2mm) of snow.
• Rexburg - May »
  During 0.6 snowfall days, in May, Rexburg aggregates 0.67" (17mm) of snow. During 0.6 snowfall days, in May, Rexburg aggregates 0.67" (17mm) of snow.
• Moscow - May »
  On the last day of the month, in Moscow sunrise is at 4:57 am and sunset at 8:33 pm PDT. In Moscow, Idaho, during May, the rain falls for 16.2 days and regularly aggregates up to 2.28" (58mm) of precipitation.