Petersburg, Alaska Weather Conditions

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Current Conditions

  • 39°
  • Overcast
  • Wind: East 7 mph
  • Humidity: 100%
  • Visibility: 10.0 miles
  • Dew Point: 39°
  • Pressure: 29.96 in. -
  • Heat Index: 34

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Next 12 Hours

3  am
6  am
9  am
12  pm
3  pm
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Overcast
Overcast
Chance of Rain
Chance of Rain
Chance of Rain
Chance of Rain
39°
38°
41°
45°
46°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Friday
  • Chance of Rain
  • High: 47 °
  • Low: 36 °
  • Chance of Rain
  • Saturday
  • Rain
  • High: 42 °
  • Low: 39 °
  • Rain
  • Sunday
  • Rain
  • High: 47 °
  • Low: 38 °
  • Rain
  • Monday
  • Overcast
  • High: 46 °
  • Low: 36 °
  • Overcast
  • Tuesday
  • Thunderstorm
  • High: 47 °
  • Low: 35 °
  • T-Storms

Forecast for Petersburg, Alaska

Updated: 1:15 AM AKDT on January 27, 2015

  • Friday

    Overcast with rain showers at times. High 47F. Winds SSE at 5 to 10 mph. Chance of rain 50%.

  • Friday Night

    Partly cloudy skies in the evening, then becoming cloudy overnight. Low 36F. Winds SE at 5 to 10 mph.

  • Saturday

    Rain. High 42F. Winds ESE at 10 to 20 mph. Chance of rain 90%. Rainfall around a half an inch.

  • Saturday Night

    Steady light rain in the evening. Showers continuing late. Low 39F. Winds SE at 10 to 15 mph. Chance of rain 80%.

  • Sunday

    Thundershowers following a period of rain early. High 47F. Winds SSE at 10 to 15 mph. Chance of rain 90%.

  • Sunday Night

    Steady light rain in the evening. Showers continuing late. Low 38F. Winds SE at 10 to 15 mph. Chance of rain 90%.

  • Monday

    Cloudy skies. High 46F. Winds NNE at 5 to 10 mph.

  • Monday Night

    A few clouds. Low 36F. Winds light and variable.

  • Tuesday

    Rain showers in the morning with thunderstorms developing in the afternoon. High 47F. Winds light and variable. Chance of rain 80%.

  • Tuesday Night

    Rain showers in the evening becoming more intermittent overnight. Low around 35F. Winds light and variable. Chance of rain 60%.

  • Wednesday

    Considerable cloudiness with occasional rain showers. High 48F. Winds light and variable. Chance of rain 50%.

  • Wednesday Night

    Cloudy with occasional rain showers. Low 36F. Winds light and variable. Chance of rain 60%.

  • Thursday

    Cloudy with periods of rain. High 44F. Winds SE at 5 to 10 mph. Chance of rain 70%. Rainfall around a quarter of an inch.

  • Thursday Night

    Cloudy. Periods of light rain early. Low 36F. Winds ESE at 5 to 10 mph. Chance of rain 60%.

  • Friday

    Cloudy with occasional light rain. High 46F. Winds light and variable. Chance of rain 60%.

  • Friday Night

    Rain showers in the evening becoming more intermittent overnight. Low 34F. Winds light and variable. Chance of rain 60%.

  • Saturday

    Cloudy with occasional showers. High 47F. Winds light and variable. Chance of rain 40%.

  • Saturday Night

    Rain. Low 36F. Winds light and variable. Chance of rain 60%. Rainfall near a quarter of an inch.

  • Sunday

    Periods of rain. High 47F. Winds SE at 5 to 10 mph. Chance of rain 60%. Rainfall around a quarter of an inch.

  • Sunday Night

    Considerable cloudiness with occasional rain showers. Low 37F. Winds light and variable. Chance of rain 40%.

  • Monday

    Considerable cloudiness with occasional rain showers. High 46F. Winds SSE at 5 to 10 mph. Chance of rain 40%.

  • Monday Night

    Considerable cloudiness with occasional rain showers. Low 38F. Winds SSE at 5 to 10 mph. Chance of rain 40%.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Pearl F Street, Petersburg, AK

Updated: 3:50 AM AKDT

Temperature: 42.4 °F Dew Point: 40 °F Humidity: 91% Wind: North at - Pressure: 30.01 in Hourly Precipitation: - Windchill: 42 °F Graphs

Location: Papke's Landing, Petersburg, AK

Updated: 3:40 AM AKDT

Temperature: 38.8 °F Dew Point: 38 °F Humidity: 99% Wind: Calm Pressure: 30.03 in Hourly Precipitation: - Windchill: 39 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Southeast Alaska forecast discussion...corrected 
National Weather Service Juneau Alaska 
408 PM akdt Thursday Mar 26 2015 


Short term...rain showers are the rule of the day across the 
Panhandle in the wake of yesterday's front. Satellite and radar 
images this morning showed an organized band of showers moving 
through the Panhandle associated with a upper short wave trough 
that was embedded in the general flow. Some of these showers 
turned out to be moderate to heavy in strength based on 
observations from Sitka, Angoon, and Klawock. There is also a bit 
of wind associated with it as well with Juneau gusting to 20 knots 
this afternoon. That trough will continue to push NE into Canada 
this afternoon and evening taking its wind and heavier showers 
with it. 


Into tonight and tomorrow, forecast remains rather quiet with 
general S to SW flow of around 20 knots continuing across the Gulf. 
Showers will continue to be blown into the Panhandle as 
temperatures aloft remain cool enough, around -25 to -30 c at 500 
mb, to spark convection off the warm ocean water. The higher and 
better orientation of the terrain of the northern Panhandle will 
result in more clouds and rain there then in the southern half of 
the Panhandle. So the highest chances of rain and greatest cloud 
cover has been placed there. The lower amount of cloud cover over 
the southern Panhandle however could allow some fog to form 
overnight so I have placed some patchy fog for the southern 
Panhandle for tonight and early tomorrow. No obvious short wave 
troughs embedded in the flow for the next 24 hours though there is 
a very weak feature currently west of 140w that will move through 
late tonight. That feature could organize and enhance the showers 
just enough for some more frequent and/or heavier showers but it 
will not be that noticeable. Only mention of snow will be on the 
upper reaches of the Haines and Klondike highways where an inch or 
two of snow could accumulate overnight. 


Likewise winds are not that significant. Highest winds over the 
next 24 hours are occurring Thursday afternoon with the trough that is 
moving through. Winds will remain mostly south and will calm down 
this evening and remain low through Friday afternoon. The only 
hazards are mainly due to continuing high seas in the Gulf from 
high SW swell. 


The European model (ecmwf) initialized the best of the various models today 
correctly placing most features in the right places compared to 
satellite images. The other models were not too far behind though 
and were decent second and third choices. Decided on using the 
European model (ecmwf) and the NAM for primary guidance for the next 24 hours. 


Long term...brief ridging behind the outgoing system will be 
pushed inland as the next weather front will move across the Gulf 
of Alaska and into the Panhandle on Saturday. Gale force winds 
leading the way will make the coastal areas gusty on early 
Saturday with the front moving though. Have just mentioned gusts 
35 miles per hour for southern 23...and zones 27 and 28. Went with a blend of 
models today using the NAM and European model (ecmwf) for adjustments to the 
forecast. 


Through the Middle Range of the forecast think most of the changes were 
small ... though I may have slowed rain onset briefly for 
Saturday. Due to the positioning of the low and front think the 
winds for northern Panhandle may be trickiest. Did not swap the 
Lynn Canal around until I knew the front was through.. but Glacier 
Bay got switched sooner do to a better synoptic flow pattern by 
roughly a half day. Am expecting some brief heavy rain over the 
southern Panhandle. 


Aloft the strong jet is still progressing across the Gulf but is 
starting to cause the upper trough to push into the broad upper 
level ridge over western half of North America. By early next week 
the present trough the one following it will have switched that 
ridge to a more zonal flow pattern. However the upper level low 
associated with the incoming storm Saturday will have lifted north 
and shifted the quasi stationary low from south of the eastern 
Aleutians to southwest of Kodiak. The jet steam weakens over the 
Pacific and shift even more south closer to 40 north by early next 
week. This will cause the stronger onshore flow aimed at the 
northern British Columbia to weaken resulting in weaker but 
continued onshore flow for Southeast Alaska. 


Overall the pattern will be closer to being wet than dry for the 
upcoming week. No significant systems expected for the week...with 
one possible exception that one of the operational models where 
hinting at a stronger system for the southern Panhandle late 
Monday. Will need to watch this to see how this thinking changes 
with future model runs. 




&& 


Ajk watches/warnings/advisories... 
public...none. 
Marine...Small Craft Advisory for pkz012. 
Small Craft Advisory due to seas for pkz022-041>043-051>053. 


&& 


$$ 


Eal/bezenek 


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



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