Petersburg, Alaska Weather Conditions

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Current Conditions

  • 54°
  • Mostly Cloudy
  • Wind: Calm
  • Humidity: 82%
  • Visibility: 10.0 miles
  • Dew Point: 48°
  • Pressure: 29.96 in. 0

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Next 12 Hours

10  pm
1  am
4  am
7  am
10  am
Mostly Cloudy
Mostly Cloudy
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Wednesday
  • Partly Cloudy
  • High: 63 °
  • Low: 48 °
  • Partly Cloudy
  • Thursday
  • Partly Cloudy
  • High: 66 °
  • Low: 50 °
  • Partly Cloudy
  • Friday
  • Mostly Cloudy
  • High: 68 °
  • Low: 50 °
  • Mostly Cloudy
  • Saturday
  • Chance of Rain
  • High: 63 °
  • Low: 52 °
  • Chance of Rain
  • Sunday
  • Partly Cloudy
  • High: 64 °
  • Low: 54 °
  • Partly Cloudy

Forecast for Petersburg, Alaska

Updated: 7:00 AM AKDT on August 19, 2014

  • Tuesday

    Partly cloudy with a chance of rain in the afternoon. Fog early. High of 61F. Winds less than 5 mph. Chance of rain 20%.

  • Tuesday Night

    Clear in the evening, then mostly cloudy. Low of 48F. Winds less than 5 mph.

  • Wednesday

    Overcast in the morning, then mostly cloudy. High of 63F. Winds less than 5 mph.

  • Wednesday Night

    Partly cloudy. Low of 48F. Winds less than 5 mph.

  • Thursday

    Partly cloudy. High of 66F. Winds less than 5 mph.

  • Thursday Night

    Clear. Low of 50F. Winds less than 5 mph.

  • Friday

    Mostly cloudy in the morning, then overcast. High of 68F. Winds less than 5 mph.

  • Friday Night

    Overcast in the evening, then mostly cloudy. Low of 50F. Winds less than 5 mph.

  • Saturday

    Overcast with a chance of rain. High of 63F. Winds less than 5 mph. Chance of rain 50%.

  • Saturday Night

    Partly cloudy. Low of 52F. Winds less than 5 mph.

  • Sunday

    Partly cloudy. High of 64F. Winds less than 5 mph.

  • Sunday Night

    Clear. Low of 54F. Winds less than 5 mph.

  • Monday

    Clear. High of 66F. Winds less than 5 mph.

  • Monday Night

    Clear. Low of 54F. Winds less than 5 mph.

  • Tuesday

    Clear. High of 68F. Winds less than 5 mph.

  • Tuesday Night

    Partly cloudy. Low of 54F. Winds less than 5 mph.

  • Wednesday

    Mostly cloudy with a chance of rain. High of 61F. Winds less than 5 mph. Chance of rain 30%.

  • Wednesday Night

    Overcast with a chance of rain. Low of 52F. Winds less than 5 mph. Chance of rain 30%.

  • Thursday

    Partly cloudy. High of 63F. Winds less than 5 mph.

  • Thursday Night

    Clear. Low of 46F. Winds less than 5 mph.

  • Friday

    Clear. High of 57F. Winds less than 5 mph.

  • Friday Night

    Clear. Low of 46F. Winds less than 5 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: RAWS KAKE AK US, Kake, AK

Updated: 9:55 PM AKDT

Temperature: 54 °F Dew Point: 51 °F Humidity: 91% Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Graphs

Location: Papke's Landing, Petersburg, AK

Updated: 10:37 PM AKDT

Temperature: 51.8 °F Dew Point: 50 °F Humidity: 94% Wind: Calm Pressure: 30.03 in Hourly Precipitation: - Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion

Southeast Alaska forecast discussion 
National Weather Service Juneau Alaska 
351 PM akdt Tuesday Aug 19 2014 

Short term...quasi-zonal flow aloft extends from the northern Pacific into 
northern Canada this afternoon. Several low amplitude upper waves are 
embedded within this flow of which is currently 
entering the southwestern Gulf...and a second is moving east-southeast over northwestern 
Canada. A scattered to broken layer of midlevel clouds is 
occurring over the Alaska Panhandle SW of the Canadian wave. 
Relatively stronger insolation over the far southern Panhandle is 
yielding temperatures climbing through the 60s...with upper 50s to 
low 60s observed elsewhere. Midlevel airmass is fairly dry across 
the region...except for the Coast Mountains...which is where 
isolated shower development will be most likely to occur through 
Wednesday afternoon. 

Moderately tight surface pressure gradient will exist in vicinity of northern 
Lynn Canal late this afternoon and evening...which could 
potentially produce a period of 20 knots slys. 
heating inland of the canal has thus far precluded significant 
strengthening of winds. Otherwise...20 knots northwesterly sea breeze will be 
possible over Cross Sound Wednesday afternoon. Surface pressure gradient 
is forecast to weaken significantly tonight resulting in light 
wind speeds for most of Southeast Alaska. Resultant decrease in boundary 
layer mixing combined with breaks in the midlevel cloud cover will 
favor areas of fog late tonight into Wednesday morning. Visibility 
restriction will likely be greatest for locations around 

Refreshed the pressure grids with a NAM/European model (ecmwf) blend. Remainder of 
the short term is basically a continuation of the forecast 
inherited from last night...with only minor modifications 
necessary. Forecast confidence is generally above average. 

Long term...while the relatively strong ridge popping up over the 
Gulf and the Panhandle Thursday and Thursday night look good for 
the forecast...changes for the weekend will be highlighted below. 
Warm August sunshine along with the warm air pushing up with the 
ridge will help temperatures largely rise to the lower 70s over 
the southern and interior Panhandle with middle to upper 60s for 
the northeast Gulf Coast from Baranof Island northward. These 
temperatures and sunny conditions will follow some areas of 
morning fog of course. Cannot ignore longer nights sneaking in the 
calendar as we March towards September. 

Let US talk change for the weekend. While we have monitored the 
developing ridge for quite sometime, it has been unclear how 
quickly the ridge will pass over US. We are entering a time of 
year where systems tend to tilt more progressively to the positive 
with strengthening westerlies. With the European model (ecmwf) as harbinger of 
these changes from yesterday's runs...the GFS is now timidly 
suggesting it was right with its 06z vote on this election day as 
the most positive towards the ecmwf's position. Thus the 12z 
European model (ecmwf) and the 06z close coordination with our friends at 
the Anchorage weather forecast office...were used to represent a developing short- 
wave rounding a large cut-off low over the western Aleutians. The 
conundrum is the 12z European model (ecmwf) pushing forward a more outward track of 
the surface low around the upper low that would place it squarely 
in the central Gulf by Friday afternoon. This was an advance over 
the 00z European model (ecmwf) to the east. Whereas the 12z GFS went further 
northwest and inland with the low carrying it up into the south 
central part of the state. The 06z GFS offered a more gentle 
compromise that agreed more with the 12z European model (ecmwf) and offered a nicer 
transition from this volatile low-confidence forecast period 
leading into the weekend to the higher confidence ensemble 
approach of wpc used to keep the next week trending wetter with 
southwest onshore flow aloft much more of a given. 

What are the results of these changes? We have reintroduced the 
chance of rain for Saturday for the Panhandle...even to the Point 
of adding it in late Friday night for the northern areas. Still 
think Sunday may be a drier day than Saturday, but could not 
entirely dispense of the rain chances here. While the text public 
forecasts may not indicate it...many areas without mention of rain 
will actually see a slight chance of rain...less than 25% 
chance...but so low it does not warrant mentioning at this point. 
It should be understood that this is a low-confidence forecast, 
but these changes needed to be made in order to allow a better 
base to trend rain certainty upward or downward. Mariners should 
take note that a wind direction change to the south is a better 
bet with this change and that given any frontal passage, they may 
be higher than indicated at any particular time. 

Even while Sunday rain may once again arrive on southeast 
shores...Friday still looks dry and sunny for earlier in the day 
over the north and most of the day over the south. 
looks like some higher clouds may start to ever so slightly Grey 
the sunshine a little in the afternoon. In addition...we shall 
monitor the marine layer that is likely to show up somewhere over 
the Gulf underneath the surface ridge middle to late week. Right guess is reaching the shore-line between Yakutat and 
Sitka area late Thursday night/Friday morning...limiting the 
warming in these zones. 

No changes for Wednesday night and Thursday. Used 06z GFS and 12z European model (ecmwf) for 
updates Thursday night and especially Friday. Friday night transitioned with 
12z GFS to 12z wpc into Saturday. Forecast confidence good through 
Thursday night...poor for weekend and increasing once again for 
the rains looking likelier for next week. 


Ajk watches/warnings/advisories... 




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