textproduct: Boise

This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Breezy and cooler today, with showers continuing in the north, but becoming sunny in the south.

- Warmer and drier Tuesday through Thursday.

- Cooling, breezy weather, Friday through Sunday, with showers possible in northern areas Saturday.

SHORT TERM /Through Wednesday Night/

Issued 217 PM MDT MON SEP 7 2026 Upper level trough continues to move northeast out of the area with lingering clouds over the mountains this afternoon. Scattered showers and isolated thunderstorms are forecast late this afternoon and evening near the Wallowa mountains and mountains north of McCall. Otherwise conditions dry out on Tuesday as the cold core upper level trough moves away and a warming trend ensues.

LONG TERM /Thursday through Monday/

Issued 217 PM MDT MON SEP 7 2026 As high pressure continues to linger over the area, Thursday will still see warmer than normal temperatures. Later Thursday, a shortwave trough ahead of a large Pacific trough off the coast of British Columbia will dig across our area. This shortwave will return precipitation chances, mainly over the northernmost mountain portions of the CWA. The cold front associated with this trough will bring gusty winds from the west and a cooldown to normal or slightly below normal temperatures Friday through Saturday. Come late Saturday, the larger parent trough is projected to steer inland and over our area as a closed upper low, continuing a cooling trend and breezy west winds. For now, long- range guidance mainly favors widespread precipitation over the northern half of our CWA Saturday through Sunday. Monday will be dry, breezy, and cool as the upper low steers out east.

AVIATION /00Z Tuesday through Wednesday/

Issued 514 PM MDT MON SEP 7 2026

VFR with SCT-BKN cumulus over high terrain this evening, then clearing tonight. Isolated weak showers near KBKE-KMYL through evening. Patchy mountain-valley stratus overnight. Surface winds: becoming variable up to 10 kt this evening. Winds aloft at 10kft MSL: W-SW 10-20 kt.

KBOI...VFR, clearing tonight. Surface winds: generally NW around 6 kt through evening, then variable or SE around 5 kt overnight.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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