Petersburg, Alaska Weather Conditions

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Current Conditions

  • 37°
  • Mostly Cloudy
  • Wind: Calm
  • Humidity: 87%
  • Visibility: 10.0 miles
  • Dew Point: 34°
  • Pressure: 30.15 in. 0

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Next 12 Hours

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Mostly Cloudy
Mostly Cloudy
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Monday
  • Rain
  • High: 45 °
  • Low: 43 °
  • Rain
  • Tuesday
  • Chance of Rain
  • High: 49 °
  • Low: 45 °
  • Chance of Rain
  • Wednesday
  • Chance of Rain
  • High: 48 °
  • Low: 42 °
  • Chance of Rain
  • Thursday
  • Overcast
  • High: 49 °
  • Low: 42 °
  • Overcast
  • Friday
  • Chance of Rain
  • High: 46 °
  • Low: 41 °
  • Chance of Rain

Forecast for Petersburg, Alaska

Updated: 5:45 PM AKST on February 7, 2016

  • Tonight

    Numerous rain showers early in the evening...then rain likely late. Patchy fog late. Lows around 36. East wind 10 to 15 mph.

  • Monday

    Rain...heavy at times. Highs around 42. Southeast wind 10 to 20 mph.

  • Monday Night

    Rain. Lows around 40. Southeast wind 10 to 15 mph.

  • Tuesday

    Rain. Highs around 47. East wind 15 mph.

  • Tuesday Night

    Mostly cloudy. Chance of rain. Lows around 39. Southeast wind 10 to 20 mph.

  • Wednesday

    Rain. Highs around 46.

  • Wednesday Night

    Rain. Lows around 39.

  • Thursday

    Rain likely. Highs around 43.

  • Thursday Night

    Cloudy. Chance of rain. Lows around 37.

  • Friday

    Cloudy. Chance of rain. Highs around 43.

  • Friday Night

    Rain likely. Lows around 36.

  • Saturday

    Rain likely. Highs around 43.

  • Saturday Night

    Rain likely. Lows around 36.

  • Sunday

    Rain likely. Highs around 43.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Pearl F Street, Petersburg, AK

Updated: 12:45 AM AKST

Temperature: 40.3 °F Dew Point: 38 °F Humidity: 92% Wind: North at - Pressure: 30.23 in Hourly Precipitation: - Windchill: 40 °F Graphs

Location: Airport Subdivision, Petersburg, AK

Updated: 12:48 AM AKST

Temperature: 38.7 °F Dew Point: 36 °F Humidity: 91% Wind: ENE at 1.3 mph Pressure: 31.26 in Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

Location: 25AE Otness Subdivision, Petersburg, AK

Updated: 12:48 AM AKST

Temperature: 38.0 °F Dew Point: 38 °F Humidity: 100% Wind: Calm Pressure: 30.09 in Hourly Precipitation: 0.00 in Windchill: 38 °F Graphs

Location: Papke's Landing, Petersburg, AK

Updated: 12:46 AM AKST

Temperature: 36.9 °F Dew Point: 37 °F Humidity: 99% Wind: Calm Pressure: 30.23 in Hourly Precipitation: - Windchill: 37 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion

Southeast Alaska forecast discussion 
National Weather Service Juneau Alaska 
318 PM akst sun Feb 7 2016 

Short term...prominent upper-level ridge is positioned over the West 
Coast of North America Sun afternoon...while an elongated trough 
resides from the Aleutians S over the north central Pacific. In between these 
two features...a long narrow river of subtropical moisture was 
spreading north within a zone of deep-layer south-southwesterly flow. Model guidance 
shows a midlevel impulse embedded within the meridional flow 
regime progressing north across the Gulf Monday afternoon/evening. This 
feature is forecast to be accompanied by a surface 
wave...however...deterministic solutions are dramatically 
different in how the wave evolves. The European model (ecmwf) and Canadian models 
spin up a relatively deep low over the eastern Gulf that tracks 
toward the northestern Gulf Coast by Monday evening. On the other hand...the 
NAM and GFS depict a significantly weaker wave that generally 
remains well offshore. Given the large model spread...took an 
ensemble approach that was weighted slightly heavier toward the 
ECMWF/Canadian...which yields small craft to localized gale force 
sselys Monday afternoon over the southeastern Gulf and southern Inner Channels. 
Stay major adjustments to the wind forecast are 
possible as confidence in surface low evolution becomes more 
clear during the next 24 hours. 

In the mean time...deep-layer ascent is forecast to weaken this 
afternoon into tonight from roughly Klawock northward to 
Juneau...Haines...and Skagway. This will cause lingering showers 
to dissipate...and perhaps aid in patchy fog over the central 
Panhandle as winds weaken and some breaks in midlevel clouds 
develop. Elsewhere...snow/rain showers will continue to be 
focused over akz017/Yakutat due to persistent southerly flow impinging 
on the Saint Elias Mountains. Slight chance of thunderstorms will 
also exist over the western and northern Gulf sun evening due to the 
presence of modest buoyancy and locally augmented ascent 
associated with the passage of weak upper impulses. 

Farther S...moist southerly stream of air will impact the southern Panhandle 
throughout the short term period. Model guidance shows precipitable water values 
near 0.95 inch /3 Standard deviations above climatology/ remaining 
stationary over the far southern Panhandle from 06z Monday through 06z 
Tuesday. This moisture combined with enhanced flux via a 30-50 knots low- 
level south-southwesterly jet will make locally heavy rain probable for 
communities such as Ketchikan...Hydaburg...and Klawock. In 
addition...3 to 7 inches of snow will be possible for Hyder...with 
amounts falling short of advisory level due to relatively warm 
surface temperatures/dewpoints. 

Finally...a warm airmass /characterized by 925 mb temperatures 
near 5 c over the southern around 0 c over the northern 
Panhandle/ will spread northward on Monday as previously mentioned wave 
moves across the Gulf. This should yield high temperatures 
moderating through the 30s and into the low to middle 40s. Inherited 
temperature grids captured this scenario well...few changes were 
necessary. Pressure grids were nudged toward an European model (ecmwf)/Canadian/NAM 
blend...with an ensemble approach utilized for updates to the 
remainder of the grids as well. 

Long term...major upper low S of the eastern Aleutians on Monday 
night as the West Coast ridge mentioned above persists...and the 
axis of that ridge is too far inland for a hope of drying. This 
allows warm moist onshore flow aloft. A secondary system develops 
over the offshore waters as a wave on the front by Monday night as 
mentioned above and the center moves to Yakutat no later than 
early Tuesday. Timing is difficult on this low center. Next we have 
another low that develops near 48n 142w Tuesday afternoon which 
allows a weak upper ridge to move over the Panhandle...but there 
is still moisture in the upper ridge. Used the 07/12z European model (ecmwf) for 
the forecasts up to Wednesday but am skeptical of the timing. High 
confidence in wet and warm but timing of wind is sketchy. Used wpc 
forecasts for days 4-8 which seemed reasonable, but not good news 
for drying. Onshore flow aloft over and over and over and over day 
by day. Confidence in the 4-8 forecast moderate to high because 
it repeats the awful pattern that we've been stuck in. 


Ajk watches/warnings/advisories... 
Marine...Gale Warning for pkz036. 
Small Craft Advisory for pkz022-031-033>035-041>043-051>053. 



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