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Hermiston, Oregon 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Hermiston OR
National Weather Service Forecast for: Hermiston OR
Issued by: National Weather Service Pendleton, OR
Updated: 4:15 pm PDT Jul 11, 2025
 
Tonight

Tonight: Mostly clear, with a low around 62. North wind around 5 mph becoming south in the evening.
Mostly Clear
Saturday

Saturday: Sunny and hot, with a high near 98. South wind 5 to 7 mph becoming west in the afternoon.
Hot
Saturday
Night
Saturday Night: Mostly clear, with a low around 67. Southwest wind around 7 mph.
Mostly Clear
Sunday

Sunday: Sunny and hot, with a high near 103. West wind 5 to 7 mph.
Hot
Sunday
Night
Sunday Night: Clear, with a low around 69. West wind 7 to 9 mph.
Clear
Monday

Monday: Sunny and hot, with a high near 99.
Hot
Monday
Night
Monday Night: Clear, with a low around 66.
Clear
Tuesday

Tuesday: Sunny, with a high near 95.
Sunny
Tuesday
Night
Tuesday Night: Clear, with a low around 63.
Clear
Lo 62 °F Hi 98 °F Lo 67 °F Hi 103 °F Lo 69 °F Hi 99 °F Lo 66 °F Hi 95 °F Lo 63 °F

Heat Advisory
 

Tonight
 
Mostly clear, with a low around 62. North wind around 5 mph becoming south in the evening.
Saturday
 
Sunny and hot, with a high near 98. South wind 5 to 7 mph becoming west in the afternoon.
Saturday Night
 
Mostly clear, with a low around 67. Southwest wind around 7 mph.
Sunday
 
Sunny and hot, with a high near 103. West wind 5 to 7 mph.
Sunday Night
 
Clear, with a low around 69. West wind 7 to 9 mph.
Monday
 
Sunny and hot, with a high near 99.
Monday Night
 
Clear, with a low around 66.
Tuesday
 
Sunny, with a high near 95.
Tuesday Night
 
Clear, with a low around 63.
Wednesday
 
Sunny, with a high near 97.
Wednesday Night
 
Mostly clear, with a low around 64.
Thursday
 
Sunny, with a high near 94.
Thursday Night
 
Mostly clear, with a low around 63.
Friday
 
Sunny, with a high near 94.

 

Forecast from NOAA-NWS for Hermiston OR.

Weather Forecast Discussion
399
FXUS66 KPDT 112305
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
405 PM PDT Fri Jul 11 2025

Updated Aviation Discussion

.SHORT TERM...Today through Sunday...High pressure is starting to
build over the PacNW and is expected to last through early next
week. Temperatures will gradually trend upward as a result,
peaking on Sunday, with highs up to 105 degrees possible across
the lower Basin (20-25% chance). A Heat Advisory has been issued
for Saturday through Monday for the Basin, Gorge, Yakima/Kittitas
Valleys, and the foothills of the northern Blues. HeatRisk shows
admittedly marginal risk for advisory threshold heat Saturday and
Monday, but with highs wavering around 100 degrees, felt that it
was necessary to broadly advertise the heat through the whole
weekend, even if some days are technically borderline.

Only other concern with high pressure in place will be an uptick in
winds across the Cascade Gaps on Sunday, which will be primarily
thermally-driven. The Kittitas Valley, in particular, may see gusts
up to 40 mph on Sunday afternoon (60-70%). RHs as of now do not look
to reach critical levels, but fire risk will be elevated
nonetheless, given how hot and dry it will be over the weekend.
Evans/74

.LONG TERM...Monday through Friday...Models continue to exhibit a
fair amount of disagreement, especially beyond the midweek. One
feature of (relative) certainty is the arrival of a shortwave
trough to our northeast around Tuesday morning. As of now,
guidance keeps us dry from this system, however a slightly more
southward track could bring a chance of slight thunderstorms to
the eastern mountains. Winds are almost certain to shift more
north and easterly as a result of this system tracking as is
currently projected, which may complicate firefighting efforts for
current and future incidents.

Temps look to cool off by Wednesday, however forecast confidence is
low, as ensembles are divided in depicting the synoptic pattern,
differing between a benign zonal flow or bringing in a trough that
could spawn thunderstorms from central Oregon up through to the
eastern mountains. Will have to see how models evolve over
subsequent runs before speaking of the forecast beyond next
Wednesday with too much confidence. Evans/74

AVIATION...00Z TAFs...VFR conditions to prevail through the
period. Skies will be mostly clear with occasional few decks AOA
20kft AGL. Winds will be light, 12kts or less, and
diurnally/terrain driven through the period...except 12-15kts
with gusts up to 25kts developing at site DLS around 20Z tomorrow.
Lawhorn/82


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  60  96  65 100 /   0   0   0   0
ALW  66  96  70 100 /   0   0   0   0
PSC  62  98  66 103 /   0   0   0   0
YKM  65  98  68 101 /   0   0   0   0
HRI  62  99  66 103 /   0   0   0   0
ELN  65  94  68  98 /   0   0   0   0
RDM  50  94  54  98 /   0   0   0   0
LGD  56  92  61  95 /   0   0   0   0
GCD  54  93  59  97 /   0   0   0   0
DLS  66  95  69 101 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Heat Advisory from noon Saturday to 8 PM PDT Monday for ORZ041-
     044-507.

WA...Heat Advisory from noon Saturday to 8 PM PDT Monday for WAZ024-
     026>029.

&&

$$

SHORT TERM...74
LONG TERM....74
AVIATION...82
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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