Bar Harbor, ME weather in September
Expect mild weather with frequent rain in Bar Harbor in September, with highs near 71°F and lows near 53°F. Rain falls on about 11 days. Great for outdoor plans.
- Normal high
- 71°F
- Normal low
- 53°F
- Wet days
- 11
- 4.2 in total
- Daylight
- 12.5 h
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 76°F | 65°F |
| Normal low | 57°F | 48°F |
| Chance of a wet day | 32% | 38% |
| Sunrise / sunset | 5:55 am / 7:09 pm | 6:29 am / 6:16 pm |
| Daylight | 13.2 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
What kind of days to expect
- Comfortable dayshigh 65-80°F (temperature only: no humidity station nearby)22 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain (temperature and rain only)2 of 30
- Hot dayshigh 90°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow11 of 30
- Notable rainat least 0.10 in7 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 4.2 in; a dry September brings about 2.3 in and a wet one about 5.8 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20201999: average high 75°F
- Coolest September1996: average high 67°F
- Wettest September2008: 11.1 in
- Driest September1998: 1.1 in
- Highest reading95°F (September 10, 2002)
- Lowest reading32°F (September 30, 1992)
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 | 78°F | 71°F | 59°F |
| Normal low | 60°F | 53°F | 43°F |
| Wet days | 9 | 11 | 12 |
| Comfortable days | 20 | 22 | 6 |
| Daylight | 14.0 h | 12.5 h | 11.0 h |
Highs change by -7°F from August and -12°F into October.
How Bar Harbor ranks in September
- Normal high340th warmest of 378 cities; 3rd of 5 in Maine
- Wet days328th driest of 378
What to pack for Bar Harbor in September
- A rain jacket or umbrella – rain on about 11 days
Heating and cooling
September has 133 heating degree days and 39 cooling degree days (base 65°F), 2% of the year's total heating and cooling demand.
Questions
How hot is Bar Harbor in September?
The normal high is 71°F and the normal low is 53°F. From 1991 to 2020 the hottest September reading was 95°F (most recently on September 10, 2002).
Does it rain a lot in Bar Harbor in September?
About 11 days in September have at least 0.01 in of precipitation, and the normal total is 4.2 in. The wettest September in 1991-2020 was in 2008 (11.1 in); the driest was in 1998 (1.1 in).
Is September a good time to visit Bar Harbor?
September ranks 4th of 12 months on our comfort score for Bar Harbor (78 out of 100). It has about 22 comfortable days (judged by temperature only). The best months are June, August and September.
Where the numbers come from
- Temperature, rain and frost dates: Acadia NP (USC00170100), 2.9 mi WSW of the city center, 470 ft (416 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Not available for this location: snowfall, snow depth, humidity and wind by hour, cloud cover and daily humidity and wind (no station close enough or similar enough in elevation).