Petersburg, Alaska Weather Conditions

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Current Conditions

  • 48°
  • Mostly Cloudy
  • Wind: ESE 9 mph
  • Humidity: 93%
  • Visibility: 10.0 miles
  • Dew Point: 46°
  • Pressure: 29.84 in. +

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Next 12 Hours

7  am
10  am
1  pm
4  pm
7  pm
Rain Showers
Rain Showers
Rain Showers
Rain Showers
Chance of Rain
Chance of Rain
Chance of Rain
Chance of Rain
Chance of Rain
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48°
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52°
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46°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Tuesday
  • Chance of Rain
  • High: 52 °
  • Low: 39 °
  • Chance of Rain
  • Wednesday
  • Partly Cloudy
  • High: 48 °
  • Low: 32 °
  • Partly Cloudy
  • Thursday
  • Mostly Cloudy
  • High: 46 °
  • Low: 45 °
  • Mostly Cloudy
  • Friday
  • Chance of Rain
  • High: 52 °
  • Low: 50 °
  • Chance of Rain
  • Saturday
  • Chance of Rain
  • High: 54 °
  • Low: 46 °
  • Chance of Rain

Forecast for Petersburg, Alaska

Updated: 7:00 AM AKDT on September 30, 2014

  • Tuesday

    Overcast with rain showers, then a chance of rain in the afternoon. High of 52F. Windy. Winds from the South at 10 to 25 mph with gusts to 35 mph. Chance of rain 50%.

  • Tuesday Night

    Overcast with a chance of rain in the evening, then partly cloudy with a chance of rain. Low of 39F. Winds from the SE at 5 to 10 mph. Chance of rain 40%.

  • Wednesday

    Partly cloudy. Fog early. High of 48F. Winds from the North at 5 to 10 mph.

  • Wednesday Night

    Partly cloudy. Fog overnight. Low of 32F. Winds from the NNE at 5 to 10 mph.

  • Thursday

    Mostly cloudy in the morning, then overcast. High of 46F. Winds from the NNE at 5 to 10 mph.

  • Thursday Night

    Overcast with a chance of rain. Low of 45F. Winds from the ESE at 5 to 15 mph. Chance of rain 70% with rainfall amounts near 0.4 in. possible.

  • Friday

    Overcast with a chance of rain. High of 52F. Winds from the SE at 10 to 15 mph. Chance of rain 50%.

  • Friday Night

    Overcast with a chance of rain. Fog overnight. Low of 50F. Winds from the SE at 10 to 15 mph. Chance of rain 80% with rainfall amounts near 1.3 in. possible.

  • Saturday

    Overcast with a chance of rain in the morning, then partly cloudy with a chance of rain. Fog early. High of 54F. Winds from the SW at 5 to 15 mph. Chance of rain 60%.

  • Saturday Night

    Clear with a chance of rain. Low of 46F. Winds from the South at 5 to 10 mph. Chance of rain 40%.

  • Sunday

    Mostly cloudy with a chance of rain. High of 54F. Winds from the SSE at 5 to 10 mph. Chance of rain 40%.

  • Sunday Night

    Partly cloudy. Fog overnight. Low of 39F. Winds less than 5 mph.

  • Monday

    Partly cloudy. High of 50F. Winds from the NNE at 5 to 10 mph.

  • Monday Night

    Clear. Low of 41F. Winds from the NNW at 5 to 10 mph.

  • Tuesday

    Clear. High of 50F. Winds from the North at 5 to 10 mph.

  • Tuesday Night

    Clear. Low of 41F. Winds less than 5 mph.

  • Wednesday

    Clear. High of 50F. Winds from the East at 5 to 15 mph.

  • Wednesday Night

    Partly cloudy with a chance of rain. Low of 45F. Winds from the ESE at 5 to 15 mph. Chance of rain 20%.

  • Thursday

    Mostly cloudy with a chance of rain. High of 52F. Winds from the ESE at 10 to 15 mph. Chance of rain 40%.

  • Thursday Night

    Overcast with a chance of rain. Low of 46F. Winds from the SE at 5 to 15 mph. Chance of rain 40%.

  • Friday

    Partly cloudy with a chance of rain. High of 52F. Winds from the SE at 5 to 15 mph. Chance of rain 40%.

  • Friday Night

    Clear. Low of 46F. Winds from the SSE at 5 to 15 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: RAWS KAKE AK US, Kake, AK

Updated: 4:55 AM AKDT

Temperature: 48 °F Dew Point: 48 °F Humidity: 100% Wind: North at 3 mph Pressure: - Hourly Precipitation: 0.00 in Windchill: 48 °F Graphs

Location: Papke's Landing, Petersburg, AK

Updated: 5:34 AM AKDT

Temperature: 49.3 °F Dew Point: 49 °F Humidity: 98% Wind: Calm Pressure: 29.94 in Hourly Precipitation: - Windchill: 49 °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 
542 am akdt Tuesday Sep 30 2014 


Short term...the main theme of the short range forecast today is 
change as we see the beginnings of the first cool air mass of the 
fall start to descend over the northern Panhandle. But first we 
have to deal with the upper trough that is dragging the cool air 
down in the first place. The trough is currently just exiting 
eastern interior Alaska and heading into the western Yukon with 
the southern end of it extending into the northern Gulf. A 80 knots 
jet streak at 500 mb that is rounding the south side of the trough 
is not only keeping the trough deep but its left exit region has 
helped form a 1002 mb surface low over the northern Gulf and 
sparked off some showers and thunderstorms over the northern Gulf 
and Gulf Coast overnight. The amount of lightning detected in that 
area has diminished in number over the last hour or two as the jet 
streak moves east. Speaking of wind there is a decent band of gale 
force winds in the Gulf just south of the low as well this 
morning. As for the rest of the Panhandle, low clouds, some fog, 
and some passing showers are the rule of the morning. 


The trough will make its way southeastward through today and 
tonight spreading rain showers as it comes. More vigorous showers 
will be starting up in the northern Panhandle this morning with 
the southern Panhandle starting to get it this afternoon. This 
trough should be in the southern Panhandle by late tonight ending 
the rain for the north by then. Temperatures aloft with this 
trough are rather cold (around -30 c). That combined with the 
still present jet streak and some upper vorticity could keep the 
possibility of some thunderstorms popping valid. As such still 
have slight chance of thunderstorms up for the near outer coastal 
areas of the northern Panhandle and the near shore waters of the 
Gulf today. Decided to not extend it into tonight as the trough 
will have weakened somewhat and the main forcing will no longer be 
over the warm waters of the Gulf. 


As the trough moves southeast the winds in the Gulf will start to 
diminish. Westerly gales will still be present through today but 
should start to diminish tonight dropping below small craft by 
late tonight. As for inner channel winds most places will be 
starting out with either west or S wind directions depending on the 
location. With the pressure gradients ahead of the trough some 
areas like Lynn Canal have jumped up to a southerly small craft 
this morning. These higher winds will transition southward through 
today and most areas will start to shift to north as the trough moves 
by. The northern Panhandle will see this shift sometime this 
afternoon while areas farther south will have to wait till 
sometime tonight. 


Behind the trough things rapidly dry and clear out as a cool air 
mass makes its way out of the Alaska interior. Yakutat will likely 
have a partly cloudy but cool night. Areas in the northern half of 
the Panhandle will see diminishing clouds tonight. As such 
overnight lows will drop into the 30s across much of the northern 
Panhandle and may get below freezing in Yakutat and White Pass 
area. Also while this air mass is coming from the Arctic it is 
not bitterly cold as we are still early in the season. Still it has 
enough punch that northerly outflow winds will start up across the 
northern Panhandle tonight due to pressure gradient alone. However 
the cool air pooling in the Yukon does not appear to be deep 
enough to get over the mountain passes yet. So northerly 
winds in the canal are only expected to reach 30 knots tonight and 
some gusts to 35 knots are expected in Disenchantment Bay. Otherwise 
most other areas will only see winds of 20 knots or less by late 
tonight. 


Short range models were in decent agreement but did differ on the 
surface low in the northern Gulf. NAM and European model (ecmwf) seemed to have a 
good handle on low position and strength. The GFS was a bit too 
far east with it and the Gem just just a bit too weak compared to 
surface observation. For winds Gem and NAM seemed to have speeds down 
while other models were just a little weak compared to some observation. 
Overall few changes in the short range with the most noticeable 
changes being strengthen the outflow winds a bit tonight. 


Long term...remnants of fast moving clipper low will cross from 
the southern Panhandle into British Columbia Wednesday morning 
with some lingering showers near Hyder. Surface high pressure that 
is building over the Yukon under an upper level trough will track 
southeastward bringing dry conditions and mostly clear skies to 
the Panhandle. Offshore flow between this area of high pressure 
and a low moving into the Alaska Gulf will begin to increase late 
Wednesday night into Thursday. This next low has potential to be a 
significant system producing strong winds and substantial 
precipitation. As this advancing low strengthens outflow winds 
will increase as the pressure gradient tightens. Winds over the Alaska 
Gulf will also increase up to gale force as the frontal boundaries 
associated with the low move in. By Thursday night the front will 
move over the Panhandle form south to north with winds continuing 
to increase. Strongest winds will be along east-west oriented 
channels, over coastal areas and out of interior passes. Gusts up 
to 50 miles per hour are not out of the question. 


After the dry Wednesday and Wednesday night more wet weather 
returns and will remain through the weekend. As this incoming 
system incorporates the remains of tropical storm kummari it will 
provide ample moisture with potential for heavy rain starting 
Thursday night into Friday. Precipitation will taper off by the end of 
the weekend as the low fills and starts to exit the region. The 
upper level trough moving over the Panhandle on Wednesday moves 
cold air mass in from the Yukon over Panhandle with 850 mb temperatures 
in the -2 to -6 c range. Clear skies may provide enough insolation 
for day time temperatures to rise into the middle 50s. Overnight lows will 
be in to upper 20 to low 30s for the central and northern 
Panhandle and the upper 30s to low 40s for the south due to not 
only the cold upper level air but also radiational cooling 
resulting from clear skies. Temperatures will return to seasonal 
normals with the advancing front with most precipitation falling as rain 
but there may be enough cold air at higher elevations to produce 
snow. 


Models had good consensus on synoptic pattern through early 
Thursday but with larger model spectrum for temperatures. Left 
grids through Wednesday mostly as is due to similarity to new 
model runs with some lower temperatures Wednesday night. The advancing 
system for late in the week became more of an issue. Previously 
the Gem had been model of choice due to its consistency, but the 
newest run shifted in position and more significantly strength by 
dropping the low center to 975 mb. The Gem/European model (ecmwf) were closer in 
strength with weaker GFS/NAM but the Gem/GFS were closer with 
position of the low with European model (ecmwf)/NAM further west. For now bumped up 
winds in anticipation of a deeper low but held off on changing the 
low position until models come to a better consensus. Forecast 
confidence is average for into Wednesday night then is well below 
average starting Thursday. 




&& 


Ajk watches/warnings/advisories... 
public...none. 
Marine...Gale Warning for pkz043-052. 
Small Craft Advisory for pkz012-013-022-033-036-041-042-051. 


&& 


$$ 


Eal/prb 


Visit US at http://www.Weather.Gov/Juneau 



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