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Helena, California 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Helena CA
National Weather Service Forecast for: Helena CA
Issued by: National Weather Service Eureka, CA
Updated: 2:23 pm PDT Jul 8, 2025
 
Tonight

Tonight: A slight chance of showers and thunderstorms between 8pm and 2am.  Areas of smoke after 11pm. Mostly clear, with a low around 58. South southwest wind 5 to 7 mph becoming calm  in the evening.  Chance of precipitation is 20%.
Slight Chance
T-storms
Wednesday

Wednesday: Areas of smoke before 8am. Sunny, with a high near 90. Calm wind becoming west 5 to 8 mph in the afternoon. Winds could gust as high as 18 mph.
Areas Smoke
then Sunny
Wednesday
Night
Wednesday Night: Areas of smoke after 8pm. Clear, with a low around 59. Northwest wind 6 to 10 mph, with gusts as high as 21 mph.
Areas Smoke
Thursday

Thursday: Areas of smoke before 8am. Sunny, with a high near 94. Calm wind becoming west northwest around 6 mph in the afternoon.
Areas Smoke
then Sunny
Thursday
Night
Thursday Night: Clear, with a low around 64. North wind 7 to 10 mph, with gusts as high as 18 mph.
Clear
Friday

Friday: Sunny and hot, with a high near 101. North northeast wind around 5 mph becoming light and variable  in the morning.
Hot
Friday
Night
Friday Night: Clear, with a low around 68.
Clear
Saturday

Saturday: Sunny and hot, with a high near 102.
Hot
Saturday
Night
Saturday Night: Clear, with a low around 68.
Clear
Lo 58 °F Hi 90 °F Lo 59 °F Hi 94 °F Lo 64 °F Hi 101 °F Lo 68 °F Hi 102 °F Lo 68 °F

 

Tonight
 
A slight chance of showers and thunderstorms between 8pm and 2am. Areas of smoke after 11pm. Mostly clear, with a low around 58. South southwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 20%.
Wednesday
 
Areas of smoke before 8am. Sunny, with a high near 90. Calm wind becoming west 5 to 8 mph in the afternoon. Winds could gust as high as 18 mph.
Wednesday Night
 
Areas of smoke after 8pm. Clear, with a low around 59. Northwest wind 6 to 10 mph, with gusts as high as 21 mph.
Thursday
 
Areas of smoke before 8am. Sunny, with a high near 94. Calm wind becoming west northwest around 6 mph in the afternoon.
Thursday Night
 
Clear, with a low around 64. North wind 7 to 10 mph, with gusts as high as 18 mph.
Friday
 
Sunny and hot, with a high near 101. North northeast wind around 5 mph becoming light and variable in the morning.
Friday Night
 
Clear, with a low around 68.
Saturday
 
Sunny and hot, with a high near 102.
Saturday Night
 
Clear, with a low around 68.
Sunday
 
Sunny and hot, with a high near 103.
Sunday Night
 
Clear, with a low around 69.
Monday
 
Sunny and hot, with a high near 103.
Monday Night
 
Clear, with a low around 68.
Tuesday
 
Sunny and hot, with a high near 101.

 

Forecast from NOAA-NWS for Helena CA.

Weather Forecast Discussion
780
FXUS66 KEKA 082044
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
144 PM PDT Tue Jul 8 2025

.SYNOPSIS...Near or slightly below normal temperatures are
expected again Wednesday. There is a slight chance for thunder
storms tonight north of highway 36. Warming is expected again
Thursday with additional warming Friday and hot weather
continuing into early next week.

&&

.DISCUSSION...The upper level continues to approach the area this
afternoon and has brought much cooler temperatures to the near
coastal areas. Temperatures in Ukiah are only around 74 as of
noon so the marine layer is obviously keep things cooler. Late
this evening and tonight the center of the upper low moves over
the area. This has the potential to bring some thunderstorms to
the area. The models aren`t explicitly outputting thunderstorms,
but there is some elevated instability. This, combined with the
dynamics of the low and steep lapse rates aloft may bring some
nocturnal thunderstorms.

Wednesday during the day the low is expected to move off to the
east and we will be in northwest flow. It looks like the threat
for thunderstorms will diminish through the day light hours on
Wednesday. Temperatures will be similar to today with a few
fluctuations here and there.

Wednesday night into Thursday morning offshore flow is expected
in Humboldt and Del Norte counties. This should diminish the
marine layer and allow skies to clear. Thursday is expected to be
the transition day with warmer temperatures, but highs are
expected to remain in the 90s in most inland areas with low to mid
60s possible along the coast. Friday additional warming is
expected with highs climbing over 100 in many of the valleys. The
coast may see highs in the middle to upper 60s with continued
offshore flow. This is expected to bring moderate to major heat
risk to many of the areas. This heat is expected to persist
through the weekend in some of the interior areas. A heat advisory
may be needed in some of the more persistently hot areas. There is
some uncertainty on how much the valleys will cool off at night
and that could mitigate the impact of the heat. MKK

&&

.AVIATION...An upper level low is currently spinning over the
coastline. Lows like this typically result in a deepening of the
marine layer, higher ceilings, and spotty drizzle. Thus, despite
lower ceilings being shown in the TAF statistical guidance, have
opted to not include below half mile visibilities for coastal
areas tonight. Some breakup of the clouds will be possible at the
coastal TAF sites but generally overcast will prevail today into
tonight. Inland VFR has developed and will persist today but
another deep push of the marine layer is expected tonight with
MVFR/IFR ceilings at UKI Wednesday morning. /RPA

&&

.MARINE...Light winds and low seas are currently dominating the marine
environment as an upper low spins over the coastal waters. This low
will move inland tomorrow allowing surface high pressure to re-build
toward the Northwest California coast over the Eastern Pacific. This
will enhance the pressure gradient and once again strengthen the
northerlies. Near gale to gale wind gusts are possible Thursday
through Saturday, most likely over the outer water zones, pulling
into just the northern waters this weekend as the thermal trough
builds north over land. Steep short period seas will build in
response to the gale northerlies. /RPA

&&

.FIRE WEATHER...High temperatures diminished today and are
expected to persist on Wednesday, with 80`s and 90`s expected for
most of the interior. The marine layer is expected to remain
deeper through Wednesday morning as an upper-low moves past the
area, bringing slightly higher afternoon RHs. As this upper low
moves overhead there is the potential for thunderstorms to move
across Humboldt, Del Norte and Trinity counties tonight.
Confidence remains low on this and the better chance for
Thunderstorms remains to the north of the area. Overnight
recoveries generally remain good aside from the exposed ridges in
the thermal belt.

Much hotter temperatures and drier humidity are likely in the
interior late this week. Thursday and Friday mornings offshore
flow will bring poor recoveries to the higher elevations and may
push the stratus off the coast. Triple digit temperatures are
likely in most of the interior valleys by Friday with very low
afternoon RHs and moderate overnight recoveries. JB

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
None.
&&

$$

NOTE: The full forecast discussion is now regularly issued between
10 am/pm and 1 pm/am. Additional updates will be issued as needed.

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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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