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Weather in Irwin, ID · National Weather Service + NOAA

It hardly ever freezes in Irwin

Irwin has cold winters and pleasant summers, with very little rain. A typical July afternoon reaches 83°, a January night drops to 10°. In November, a normal day reaches 42° and a normal night drops to 20°.

Winter 31°/12°Spring 54°/28°Summer 79°/45°Fall 57°/29°
Right now
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Sunrise 9:02 am · sunset 7:15 pm

Getting the latest forecast from the National Weather Service…

What stands out about Irwin’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
It hardly ever freezesOnly 100% of years see a night at 32° or below.A dry climateJust 18 inches of rain and melted snow a year, less than 91% of U.S. towns.Among Idaho’s coldest wintersJanuary nights average 10°, colder than 211 of 234 Idaho towns.
A normal year

Where today sits in Irwin’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
31° / 12°
Snow is rare
Spring
54° / 28°
Frost is rare by spring
Summer
79° / 45°
14 days reach 90° in a normal year
Fall now
57° / 29°
Mild well into the fall
Best months to be outside
JunJulAug
Highs of 62–84° and lows of 40° or more
When is it wettest?May, with 2.1 inches.Is it warmer than it used to be?+1.2° vs. the 20th century.What is each month like?Highs, lows, rain and snow for all 12.

Weather talk

Road reports, first frosts and storm memories from neighbors in Irwin.

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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Irwin itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Swan Valley, ID (2 mi, frost, heat and degree days). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.