Dallas, Oregon 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Dallas OR
National Weather Service Forecast for:
Dallas OR
Issued by: National Weather Service Portland, OR |
Updated: 3:21 am PDT Jul 27, 2025 |
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Overnight
 Partly Cloudy
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Sunday
 Becoming Sunny
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Sunday Night
 Mostly Clear
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Monday
 Sunny
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Monday Night
 Clear
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Tuesday
 Sunny
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Tuesday Night
 Mostly Clear
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Wednesday
 Sunny
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Wednesday Night
 Partly Cloudy
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Lo 52 °F |
Hi 81 °F |
Lo 53 °F |
Hi 86 °F |
Lo 56 °F |
Hi 89 °F |
Lo 59 °F |
Hi 89 °F |
Lo 59 °F |
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Overnight
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Partly cloudy, with a low around 52. Calm wind. |
Sunday
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Partly sunny, then gradually becoming sunny, with a high near 81. Calm wind becoming northwest around 6 mph in the afternoon. |
Sunday Night
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Mostly clear, with a low around 53. West northwest wind 5 to 7 mph becoming calm after midnight. |
Monday
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Sunny, with a high near 86. Calm wind becoming north around 5 mph in the afternoon. |
Monday Night
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Clear, with a low around 56. Northwest wind 5 to 7 mph becoming calm after midnight. |
Tuesday
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Sunny, with a high near 89. |
Tuesday Night
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Mostly clear, with a low around 59. |
Wednesday
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Sunny, with a high near 89. |
Wednesday Night
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Partly cloudy, with a low around 59. |
Thursday
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Mostly sunny, with a high near 85. |
Thursday Night
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Partly cloudy, with a low around 58. |
Friday
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Sunny, with a high near 86. |
Friday Night
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Mostly clear, with a low around 56. |
Saturday
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Sunny, with a high near 85. |
Forecast from NOAA-NWS
for Dallas OR.
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Weather Forecast Discussion
131
FXUS66 KPQR 270445
AFDPQR
Area Forecast Discussion
National Weather Service Portland OR
945 PM PDT Sat Jul 26 2025
.SYNOPSIS...Benign onshore flow keeps temperatures near
seasonal norms through this weekend. Temperatures trend warmer
again during the first half of next week, with thunderstorms
looking increasingly possible along the Cascades each afternoon
and evening.
&&
.SHORT TERM...Now through Sunday Night...Upper-level troughing
continues to progress eastward, coming more overhead across the
PacNW today. Guidance initially suggested clouds clearing by
this afternoon but low-level clouds have stuck around longer
across the region. This will likely stunt peak afternoon
temperatures, topping out in the mid to upper 70s inland.
Coastal areas and the Cascades are expected to reach the low 60s
to low 70s. Conditions on Sunday will be similar, though model
guidance is suggesting lower probabilities for cloud cover
developing inland late tonight. Chances are 20-50% as of now but
seem to be less coherent/homogeneous at this time. Overall,
Sunday is expected to be a few degrees warmer than today with
highs topping out in the low 80s inland and mid 60s to low 70s
along the coast and Cascades. -Batz
.LONG TERM...Monday through Friday...Guidance continues to
suggest temperatures rebound back into the upper 80s to low 90s
Monday through Wednesday as ridging builds across the Great
Basin and into the PacNW. Probabilities for inland valleys to
reach 90 degrees on Monday are modest at 10-40% but increase
significantly Tuesday and Wednesday to 50-80% for most
locations. Although hotter temperatures are expected, a more
significant heat event continues to look unlikely as the
forecast envelope remains rather tightly clustered in the low
90s while HeatRisk largely remains in the minor category with a
few patches of moderate in the interior valleys. This is
underscored by NBM probabilistic guidance which continues to
keep chances to reach 95 degrees near or under 20% for the most
part. Guidance then suggests temperatures will begin to moderate
back towards seasonal norms late in the week as the ridge axis
begins to shift further east.
A deepening upper level low is also likely to set up off the British
Columbia coast, though there is disagreement among the models where
exactly the center of the low sets up. Depending on where it
sets up, south to southeast flow could set up across the PacNW
or at least a portion of the area, bringing monsoonal moisture
and potential for thunderstorms. Persistent southerly flow will
help increase PWAT values to 1.0-1.2 inches east of the coast
range. These values are 120-160% of normal for this time of year
with the higher larger anomalies across the Cascades of Lane
and Linn county. Disturbances embedded within the upper level
flow will help support destabilization across central Oregon and
to a lesser extend over the Cascade crest. For now, have
introduced a 15-20% chance for the far eastern portions of Lane
and Linn counties Monday and Tuesday evenings. Agreement and
exact details become murkier into the middle of next week but
the threat for thunderstorms along the crest remains. A stronger
embedded shortwave is expected to move through the upper levels
across northern California and Oregon which would bring better
large-scale accent and possibly greater thunderstorm coverage
Wednesday and Thursday evenings. Models also show potentially
weak steering flow which could lead to slow storm motion and
localized heavy rains. -Batz
&&
.AVIATION...VFR conditions expected across the region to begin the
period, before marine stratus rebuilds along the coast by 12z Sun
and pushes inland by 15z Sun, with MVFR cigs favored at coastal,
Portland-area, and southern Willamette Valley terminals. KONP will
be the most likely to see periods of IFR cigs from 12-15z Sun,
but confidence in persistent IFR conditions is low. Central and
northern Willamette Valley terminals will likely also see an
increase in low clouds, but coverage looks to be too low to yield
MVFR cigs at this point. Marine stratus will break up through the
morning, seeing a return to clearer skies by 16-20z Sun. Light
winds of less than 5 kt tonight will increase out of the west to
northwest at 5-10 kt by Sunday afternoon.
PDX AND APPROACHES...VFR conditions likely through at least 12z
Sun beneath largely clear skies. Resurgent marine stratus arriving
up the Columbia River may again see MVFR cigs, most likely from
13-17z Sun, although guidance has struggled recently with both the
onset and especially the dissipation of low clouds. VFR conditions
are nonetheless favored to return after 17-18z Sun. Northwest flow
continues at 5 kt or less overnight, increasing to 5-10 kt after
16-18z Sun. -Picard
&&
.MARINE...Surface high pressure continues to reside across the
coastal waters through the latter half of the weekend into next
week facilitating rather benign conditions going forward. Expect
winds to remain generally out of the north through at least the
middle of the coming week although there may be a bit of a
easterly component to the flow on Sunday. Tuesday onward these
northerly winds will be a little breezier compared to Sunday and
Monday with gusts in the 15-20 kt range during the afternoons and
evenings. Fortunately, background swells remain unimpressive
through the midweek as well, so given the aforementioned winds the
likelihood for Small Craft advisory conditions are low. -Schuldt
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
PZ...None.
&&
$$
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