Juneau, AK weather in September
September in Juneau: cool, with rain on most days. Highs 56°F, lows 44°F, about 22 wet days. Keep rain gear handy.
- Normal high
- 56°F
- Normal low
- 44°F
- Wet days
- 22
- 9.2 in total
- Muggy days
- 0
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 60°F | 53°F |
| Normal low | 47°F | 42°F |
| Chance of a wet day | 72% | 76% |
| Sunrise / sunset | 5:57 am / 7:58 pm | 7:00 am / 6:35 pm |
| Daylight | 14.0 h | 11.6 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Alaska Time).
A typical September day
- 6 am47°Fdew point 45°F
- 9 am50°Fdew point 47°F
- Noon54°Fdew point 47°F
- 3 pm54°Fdew point 47°F
- 6 pm52°Fdew point 47°F
- 9 pm49°Fdew point 46°F
NOAA hourly normals (local standard time) from Juneau Intl Airport (7 mi away); average wind 8 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F2 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph0 of 30
- Hot dayshigh 90°F or more0 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow22 of 30
- Notable rainat least 0.10 in17 of 30
- Freezing nightslow 32°F or below1 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 9.2 in; a dry September brings about 7.7 in and a wet one about 11.0 in (25th and 75th percentiles). About 7 days bring half an inch or more, and about 2 an inch or more. Snow is very rare.
How September varies from year to year
- Warmest September, 1991-20202018: average high 61°F
- Coolest September1992: average high 52°F
- Wettest September1991: 15.1 in
- Driest September2018: 2.3 in
- Highest reading73°F (September 3, 1996)
- Lowest reading27°F (September 29, 2009)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 63°F | 56°F | 47°F |
| Normal low | 49°F | 44°F | 37°F |
| Wet days | 19 | 22 | 23 |
| Comfortable days | 11 | 2 | 0 |
| Daylight | 15.3 h | 12.8 h | 10.3 h |
Highs change by -7°F from August and -9°F into October.
Nearby alternatives in September
- Drier: Skagway, AK86 mi · high 57°F · 17 wet days
How Juneau ranks in September
- Normal high374th warmest of 378 cities; 4th of 8 in Alaska
- Wet days376th driest of 378
- Comfortable days254th most of 342
What to pack for Juneau in September
- A rain jacket or umbrella – rain on about 22 days
Heating and cooling
September has 447 heating degree days and 0 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How cold is Juneau in September?
The normal high is 56°F and the normal low is 44°F. From 1991 to 2020 the coldest September reading was 27°F (September 29, 2009).
Does it rain a lot in Juneau in September?
About 22 days in September have at least 0.01 in of precipitation, and the normal total is 9.2 in. The wettest September in 1991-2020 was in 1991 (15.1 in); the driest was in 2018 (2.3 in).
Is September a good time to visit Juneau?
September ranks 6th of 12 months on our comfort score for Juneau (43 out of 100). It has about 2 comfortable days. The best months are June, July and August.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates and humidity and wind by hour: Juneau Intl Airport (USW00025309), 6.5 mi NW of the city center, 16 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Juneau International (703810-25309), 6.1 mi NW of the city center, 19 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).