Lewiston, Idaho 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Lewiston ID
National Weather Service Forecast for:
Lewiston ID
Issued by: National Weather Service Spokane, WA |
Updated: 7:27 pm PDT Jul 9, 2025 |
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Tonight
 Mostly Clear and Breezy
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Thursday
 Sunny
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Thursday Night
 Mostly Clear
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Friday
 Hot
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Friday Night
 Mostly Clear
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Saturday
 Hot
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Saturday Night
 Mostly Clear
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Sunday
 Hot
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Sunday Night
 Clear
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Lo 69 °F |
Hi 91 °F |
Lo 65 °F |
Hi 97 °F |
Lo 65 °F |
Hi 101 °F |
Lo 69 °F |
Hi 102 °F |
Lo 71 °F |
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Tonight
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Mostly clear, with a low around 69. Breezy, with a west wind 16 to 20 mph, with gusts as high as 31 mph. |
Thursday
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Sunny, with a high near 91. West wind 9 to 14 mph, with gusts as high as 23 mph. |
Thursday Night
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Mostly clear, with a low around 65. Northwest wind 5 to 9 mph becoming calm in the evening. |
Friday
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Sunny and hot, with a high near 97. Calm wind becoming northwest around 6 mph in the afternoon. |
Friday Night
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Mostly clear, with a low around 65. Northwest wind 5 to 7 mph becoming light and variable after midnight. |
Saturday
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Sunny and hot, with a high near 101. |
Saturday Night
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Mostly clear, with a low around 69. |
Sunday
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Sunny and hot, with a high near 102. |
Sunday Night
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Clear, with a low around 71. |
Monday
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Sunny and hot, with a high near 102. |
Monday Night
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Clear, with a low around 70. |
Tuesday
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Sunny and hot, with a high near 100. |
Tuesday Night
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Mostly clear, with a low around 68. |
Wednesday
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Sunny and hot, with a high near 101. |
Forecast from NOAA-NWS
for Lewiston ID.
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Weather Forecast Discussion
105
FXUS66 KOTX 092240
AFDOTX
Area Forecast Discussion
National Weather Service Spokane WA
340 PM PDT Wed Jul 9 2025
.KEY MESSAGES...
- Dry conditions and increasing winds will bring critical fire
weather conditions today. Red Flag Warnings have been issued
through 8pm tonight.
- Strongest winds will be seen this afternoon and evening.
Gusty conditions expected regionwide with gusts 30 to 40 mph.
&&
.SYNOPSIS...
Increasing winds combined with dry conditions will result in
critical fire weather conditions through today. Limited shower
chances will be found over the area through Thursday, largely
near the mountains. After a brief mid-week cool down, warm
temperatures will return Friday into next weekend.
&&
.DISCUSSION...
Today through tonight: Fire weather concerns continue and peak today
as a cold front moving through brings gusty winds to the area. While
this front and the departure of the troughs will bring a brief
downtrend in temperatures down to around normal, the main impact for
today is the gusty westerly winds. With most areas already gusting
to 25mph, winds will further increase throughout the afternoon and
evening, reaching 30mph in places such as Spokane, Coeur d`Alene,
Pullman, and Lewiston. Areas that will see the highest winds are the
Wenatchee, Waterville Plateau, Moses Lake, and Upper Columbia Basin
areas, which have the potential to gust to 40-45mph. These winds
will continue through late this evening. These winds combined with
low relative humidity values create fire weather concerns, with the
potential being fires moving quickly due to wind. As a result, a Red
Flag Warning is in effect for much of the forecast area but the far
northern areas through 8pm tonight. A small shortwave embedded
within the flow will bring enough lift for a small chance of
thunderstorms in far northeastern Washington and northern Idaho
Panhandle. Surface based CAPE for these areas is 100-200 J/kg, and
biggest concerns with these thunderstorms will be gusty outflow
winds and any lightning strikes. The crest of the Cascades could see
some light precipitation, though any measurable amounts are not
anticipated. The gusty winds this afternoon will result in smoke
from the Pomas and Hope Fires being carried over the region.
Tomorrow through Sunday: As the low weakens and moves out of the
area by late tomorrow, temperatures will decrease further, to the
mid 80s. The aforementioned shortwave will continue to impact the
area tomorrow as well, bringing additional chances of light showers
to the mountains. Thunderstorm coverage will be smaller in extent
but Bonners Ferry has a 10 percent chance of thunder tomorrow
afternoon. The return to near normal temperatures will be brief, as
a ridge off the Pacific Coast flattens. This will result in
temperatures increasing back into the mid 90s. Winds tomorrow will
not be as strong as today but will still be breezy throughout the
same areas and lessen in nature through the weekend.
Monday through Wednesday: The flattened ridge will begin to amplify
on Monday due to a low pressure system strengthening near the
Aleutian Islands. This will result in northwest flow moving into the
area. While this will lower temperatures slightly and could bring a
few light showers, an uptick in winds is seen by long-term models,
which could mean the return of fire weather concerns. Clusters are
in good agreement of continuing ridging just off the Pacific
Northwest coast, and the CPC`s 6-10 and 8-14 Day Outlooks have the
state seeing increased chances of above normal temperatures and
slightly above normal chances for precipitation. /AS
&&
.AVIATION...
00Z TAFS: VFR conditions will prevail. Most TAF sites have
already gusted to 25kts or more. These gusty winds will continue
through tonight, with KEAT/KMWH anticipating the highest winds
at 35kts. Winds will decrease around 03-05Z except for KEAT,
where winds will continue for another couple hours. Smoke from
the Pomas and Hope Fires will make its way across eastern
Washington and into the Northern Idaho Panhandle. Areas that
could see smoke include GEG, SFF, and COE but confidence is not
high enough to include them in the TAFs and visibilities don`t
look to be degraded either. Chance for some thunderstorms along
the Canadian border and Panhandle, but confidence is low to
moderate. Chance for some showers along the Cascade crests, but
confidence is also low.
FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence
in VFR conditions through the TAF period. High confidence in
gusty winds through this afternoon and evening. Moderate
confidence in haze due to smoke but low confidence it will
impact any visibilities. Low to moderate confidence in
afternoon thunderstorms and low confidence in showers along the
Cascades. /AS
-----------------------
Confidence descriptors:
Low - Less than a 30 percent chance
Moderate - 30 to 70 percent chance
High - Greater than a 70 percent chance
For additional probabilistic information for NWS Spokane
airports, please refer to the Aviation Dashboard on our
webpage: https:/www.weather.gov/otx/avndashboard
&&
.Preliminary Point Temps/PoPs...
Spokane 59 83 55 89 59 92 / 0 0 0 0 0 0
Coeur d`Alene 58 81 54 87 58 91 / 10 0 0 0 0 0
Pullman 54 79 52 85 54 88 / 0 0 0 0 0 0
Lewiston 66 88 63 94 64 99 / 10 0 0 0 0 0
Colville 48 81 45 87 50 93 / 10 10 0 0 0 0
Sandpoint 55 77 49 84 54 87 / 10 20 0 0 0 0
Kellogg 59 77 57 84 61 87 / 0 10 0 0 0 0
Moses Lake 59 88 59 93 60 98 / 0 0 0 0 0 0
Wenatchee 63 85 63 93 68 96 / 10 0 0 0 0 0
Omak 57 84 56 92 62 96 / 10 0 0 0 0 0
&&
.OTX WATCHES/WARNINGS/ADVISORIES...
WA...Red Flag Warning until 8 PM PDT this evening for Colville
Reservation (Zone 702)-Eastern Columbia Basin -Palouse -
Spokane Area (Zone 708)-Foothills of Central Washington
Cascades (Zone 705)-Foothills of Northeast Washington
(Zone 701)-Lower Palouse -Snake River (Zone 709)-
Okanogan Valley (Zone 703)-Waterville Plateau (Zone 706)-
Western Columbia Basin (Zone 707).
ID...&&
$$
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