NWS Forecast for Petersburg AK

National Weather Service Forecast for: Petersburg AK
Issued by: National Weather Service Juneau, AK

Updated: 7:32 pm AKDT Jun 21, 2026

Overnight Mostly Cloudy	Monday Mostly Cloudy	Monday Night Chance Showers	Tuesday Mostly Cloudy	Tuesday Night Mostly Cloudy then Areas Fog	Wednesday Patchy Fog then Cloudy	Wednesday Night Chance Showers	Thursday Rain Likely	Thursday Night Rain Likely
Lo 53 °F	Hi 68 °F	Lo 52 °F	Hi 66 °F	Lo 51 °F	Hi 63 °F	Lo 51 °F	Hi 59 °F	Lo 50 °F

Overnight	Mostly cloudy, with a low around 53. Calm wind.
Monday	Mostly cloudy, with a high near 68. Calm wind becoming northeast around 5 mph.
Monday Night	A 30 percent chance of showers, mainly before 10pm. Mostly cloudy, with a low around 52. Calm wind.
Tuesday	Mostly cloudy, with a high near 66. Calm wind becoming west around 5 mph.
Tuesday Night	Areas of fog after 1am. Otherwise, mostly cloudy, with a low around 51. Calm wind.
Wednesday	Patchy fog before 7am. Otherwise, cloudy, with a high near 63.
Wednesday Night	A 50 percent chance of showers. Cloudy, with a low around 51.
Thursday	Rain likely. Cloudy, with a high near 59.
Thursday Night	Rain likely. Cloudy, with a low around 50.
Friday	A chance of rain. Cloudy, with a high near 61.
Friday Night	A chance of showers. Mostly cloudy, with a low around 51.
Saturday	A chance of showers. Mostly cloudy, with a high near 61.
Saturday Night	Mostly cloudy, with a low around 50.
Sunday	Mostly cloudy, with a high near 60.

Forecast from NOAA-NWS for Petersburg AK.