Payette, Idaho 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

537
FXUS65 KBOI 091201
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
601 AM MDT Sat May 9 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Turning hotter Sunday with lower elevations hitting 90 for the
  first time this year.

- Record highs possible on Tuesday with temperatures in the mid
  to upper 90s in the lower valleys.

- Not as hot with a slight chance of precipitation in the
  mountains starting Wednesday.

&&

.SHORT TERM /Through Monday Night/...
Issued 400 AM MDT SAT MAY 9 2026
A weak cold front has moved through the area this morning with
breezy west to northwest winds overnight. Temperatures will be
similar to yesterday, with highs around 5-10 degrees above
normal. The warm air mass under the building ridge will shift
into our region on Sunday, bringing an abrupt warmup. As winds
become easterly, high temperatures on Sunday will push to 15-20
degrees above normal. This will put lower elevation sites near
90 and mountain valleys into the upper 70s. Temperatures will be
within 5 degrees of records at many locations Sunday. A weak
shortwave will bring increased clouds on Sunday evening into
Monday morning with slightly cooler temperatures on Monday.

&&

.LONG TERM /Tuesday through Saturday/...
Issued 400 AM MDT SAT MAY 9 2026
Strong ridging will continue to extend over the region on
Tuesday. Tuesday will see temperatures up to 25 degrees above
normal, with valley areas potentially reaching the mid to upper
90s. A very weak cooldown is expected Wednesday, as temperatures
are still projected to be 10 to 20 degrees above normal.
Considerable guidance uncertainty remains over the incoming
Pacific pattern midweek through the end of the week. For now,
Wednesday will see a 20 to 30 percent chance of precipitation
mainly over mountain areas. Depending on the timing and pattern
of the incoming Pacific low, Thursday may see area-wide
precipitation and convective chances. The unsettled pattern
towards the end of the week will likely bring a cooldown Friday
through Saturday, with temperatures potentially returning to
near-seasonal normals. Long-range guidance also hints at a more
northerly trough potentially digging across the region on
Saturday.

&&

.AVIATION /12Z Saturday through Sunday/...
Issued 559 AM MDT SAT MAY 9 2026
VFR with few high clouds to the south near NV border. Surface
winds: W-NW 5-10 kt, except SW-NW 10-15 kt with gusts 20-25 kt
near KTWF/KJER this morning through afternoon. Gusts 20-30 kt
expected east of KBOI in the afternoon. Winds aloft at 10kft
MSL: NW 20-30 kt.

KBOI...VFR. Surface winds: NW 6-12 kt throughout morning, with
gusts 16-20 kt in the afternoon.

Sunday Outlook...VFR. Surface winds SW-SE 10-20 kt. A cold front
Sunday night will return NW gusts of 15-30 kt. Strongest late
evening gusts expected over KBKE and KONO.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.

OR...None.

&&

$$

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AVIATION.....JY
SHORT TERM...KA
LONG TERM....JY