Alaska · county records since 1925, through September 2026.
Weather › Alaska › Juneau City and Borough
September 2026 averaged 42.9° in Juneau City and Borough, right at the usual for September (37th warmest of 102). The warmest September on record there was 1995, at 46.5°.
That is the 1991 to 2020 average for these dates in Juneau City and Borough. The Weather Service forecast fills in below.
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Each bar is a month's average temperature against the usual for that month (1991 to 2020). Ranks compare the same month in every year since 1925.
Rain and melted snow against the usual for each month. The drought reading is NOAA's Palmer index for the county.
| Month | Usual high / low | Usual rain | Warmest | Coldest |
|---|---|---|---|---|
| January | 25° / 15° | 17.9 in | 28.7° 1981 | 2.7° 1969 |
| February | 28° / 16° | 12.5 in | 30.2° 1977 | 1.8° 1936 |
| March | 31° / 19° | 12.3 in | 31.9° 2016 | 17.3° 2026 |
| April | 40° / 26° | 9.6 in | 36.6° 1993 | 26.6° 1954 |
| May | 48° / 35° | 9.2 in | 46.0° 2005 | 35.4° 1955 |
| June | 53° / 41° | 7.7 in | 52.5° 1936 | 42.5° 1949 |
| July | 55° / 43° | 10.5 in | 51.7° 1951 | 44.3° 2008 |
| August | 54° / 43° | 17.4 in | 52.2° 2004 | 44.6° 1969 |
| September | 48° / 38° | 27.4 in | 46.5° 1995 | 38.8° 1992 |
| October | 39° / 30° | 21.9 in | 39.0° 1936 | 30.6° 1956 |
| November | 30° / 21° | 18.4 in | 32.2° 2002 | 12.4° 2006 |
| December | 27° / 18° | 17.8 in | 29.0° 1930 | 2.3° 1933 |
Warmest and coldest are the month's whole-month average temperature, with the year it happened.