Augusta weather in September: Augusta, Maine: normal highs, lows, rain and records for September
Augusta in September has a normal high of 71°F and a normal low of 51°F, a daily mean of 61°F, falling from 76°F on the 1st to 65°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 3.90 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 11°C, 99 mm of precipitation in September.
- NOAA stationAugusta State Airport
- Station IDUSW00014605
- Location44.32°N 69.80°W
- Elevation350 ft (107 m)
- From the center3 miles
- Population19,168
- Jan 29° 12°
- Feb 32° 14°
- Mar 41° 23°
- Apr 54° 34°
- May 66° 45°
- Jun 74° 54°
- Jul 80° 60°
- Aug 79° 59°
- Sep 71° 51°
- Oct 58° 40°
- Nov 46° 30°
- Dec 35° 20°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Augusta in September?
The normal high is 71°F and the normal low 51°F, for a daily mean of 61.0°F. September is 7.9°F cooler than August and 11.8°F warmer than October. September is the 4th warmest month of the year in Augusta and the 4th wettest. Across the month the normal high falls 11°F, from 76°F on September 1 to 65°F on September 30. From one year to the next September's mean temperature typically moves about 2.2°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 59°F and 63°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 36%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 76°F | 56°F | 34% | 19% |
| September 8 | 74°F | 54°F | 34% | 20% |
| September 15 | 71°F | 51°F | 34% | 20% |
| September 22 | 68°F | 49°F | 35% | 21% |
| September 30 | 65°F | 46°F | 36% | 22% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 76°F | 56°F | 34% | 19% | 13 h 20 min |
| September 2 | 76°F | 56°F | 34% | 19% | 13 h 10 min |
| September 3 | 76°F | 55°F | 34% | 19% | 13 h 10 min |
| September 4 | 75°F | 55°F | 34% | 19% | 13 h 10 min |
| September 5 | 75°F | 55°F | 34% | 19% | 13 h 10 min |
| September 6 | 75°F | 54°F | 34% | 20% | 13 h |
| September 7 | 74°F | 54°F | 34% | 20% | 13 h |
| September 8 | 74°F | 54°F | 34% | 20% | 13 h |
| September 9 | 74°F | 53°F | 34% | 20% | 12 h 50 min |
| September 10 | 73°F | 53°F | 34% | 20% | 12 h 50 min |
| September 11 | 73°F | 53°F | 34% | 20% | 12 h 50 min |
| September 12 | 73°F | 52°F | 34% | 20% | 12 h 40 min |
| September 13 | 72°F | 52°F | 34% | 20% | 12 h 40 min |
| September 14 | 72°F | 52°F | 34% | 20% | 12 h 40 min |
| September 15 | 71°F | 51°F | 34% | 20% | 12 h 40 min |
| September 16 | 71°F | 51°F | 34% | 20% | 12 h 30 min |
| September 17 | 71°F | 51°F | 34% | 20% | 12 h 30 min |
| September 18 | 70°F | 50°F | 34% | 20% | 12 h 30 min |
| September 19 | 70°F | 50°F | 34% | 21% | 12 h 20 min |
| September 20 | 69°F | 50°F | 35% | 21% | 12 h 20 min |
| September 21 | 69°F | 49°F | 35% | 21% | 12 h 20 min |
| September 22 | 68°F | 49°F | 35% | 21% | 12 h 10 min |
| September 23 | 68°F | 48°F | 35% | 21% | 12 h 10 min |
| September 24 | 67°F | 48°F | 35% | 21% | 12 h 10 min |
| September 25 | 67°F | 48°F | 35% | 21% | 12 h 10 min |
| September 26 | 67°F | 47°F | 36% | 21% | 12 h |
| September 27 | 66°F | 47°F | 36% | 21% | 12 h |
| September 28 | 66°F | 47°F | 36% | 22% | 12 h |
| September 29 | 65°F | 46°F | 36% | 22% | 11 h 50 min |
| September 30 | 65°F | 46°F | 36% | 22% | 11 h 50 min |
- Normal high
- 71°FSeptember average
- Normal low
- 51°FSeptember average
- Precipitation
- 3.90 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 16
- Days at 80°F or more
- 4
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014605; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Augusta in September?
On a given September day the chance of 0.01 inch or more is 34% on average, highest around September 30 (36%). In all, 3.90 in falls on 10 days of a normal September, 1 of them with an inch or more.
In a normal September in Augusta, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014605.
How humid and windy is Augusta in September?
At 3 p.m. the normal temperature is 63°F with 55% relative humidity and a dew point of 46°F; at 6 a.m. it is 49°F with 89% humidity. The wind averages 6.8 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 49°F | 46°F | 89% | 5.5 mph | – |
| 9 a.m. | 56°F | 47°F | 73% | 7.6 mph | – |
| noon | 61°F | 47°F | 58% | 8.4 mph | 49% |
| 3 p.m. | 63°F | 46°F | 55% | 8.6 mph | 54% |
| 6 p.m. | 57°F | 47°F | 70% | 6.8 mph | 60% |
| 9 p.m. | 53°F | 47°F | 81% | 5.8 mph | 59% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014605. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Augusta?
The warmest September temperature on this station's record (since 1948) is 96°F, on September 9, 2002; the coldest is 28°F, on September 28, 1965. The wettest September brought 11.29 in (1999).
The September mean against the 1991-2020 normal of 61.0°F: 2021 64.2°F (+3.2), 2022 61.7°F (+0.7), 2023 65.6°F (+4.6), 2024 63.8°F (+2.8), 2025 64.0°F (+3.0), 2026 60.5°F (−0.5). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 64.2°F | +3.2°F | 6.14 in |
| 2022 | 61.7°F | +0.7°F | 3.88 in |
| 2023 | 65.6°F | +4.6°F | 2.96 in |
| 2024 | 63.8°F | +2.8°F | 1.57 in |
| 2025 | 64.0°F | +3.0°F | – |
| 2026 | 60.5°F | −0.5°F | 3.32 in |
Source: records: ACIS, station USW00014605; recent months: ACIS, station USW00014605. Records and recent months use complete months only.
How does September in Augusta compare across Maine?
Across the 42 places PlainClimate covers in Maine, September normal highs run from 66°F in Limestone to 73°F in Sanford; Augusta's is 71°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.