Amherst weather in September: Amherst, Massachusetts: normal highs, lows, rain and records for September
Amherst in September has a normal high of 74°F and a normal low of 50°F, a daily mean of 62°F, falling from 79°F on the 1st to 69°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 4.62 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 10°C, 117 mm of precipitation in September.
- NOAA stationAmherst
- Station IDUSC00190120
- Location42.39°N 72.54°W
- Elevation145 ft (44 m)
- Population40,989
- Jan 34° 14°
- Feb 37° 15°
- Mar 45° 24°
- Apr 58° 34°
- May 70° 45°
- Jun 78° 55°
- Jul 83° 60°
- Aug 82° 58°
- Sep 74° 50°
- Oct 62° 39°
- Nov 50° 29°
- Dec 39° 21°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Amherst in September?
The normal high is 74°F and the normal low 50°F, for a daily mean of 62.3°F. September is 7.6°F cooler than August and 12.1°F warmer than October. September is the 4th warmest month of the year in Amherst and the 2nd wettest. Across the month the normal high falls 10°F, from 79°F on September 1 to 69°F on September 30. From one year to the next September's mean temperature typically moves about 2.3°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 60°F and 65°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 79°F | 55°F | 28% | 19% |
| September 8 | 77°F | 53°F | 28% | 19% |
| September 15 | 75°F | 51°F | 29% | 21% |
| September 22 | 72°F | 48°F | 31% | 22% |
| September 30 | 69°F | 45°F | 33% | 23% |
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 | 79°F | 55°F | 28% | 19% | 13 h 10 min |
| September 2 | 79°F | 55°F | 28% | 19% | 13 h 10 min |
| September 3 | 79°F | 55°F | 28% | 19% | 13 h 10 min |
| September 4 | 78°F | 54°F | 28% | 19% | 13 h |
| September 5 | 78°F | 54°F | 28% | 19% | 13 h |
| September 6 | 78°F | 54°F | 28% | 19% | 13 h |
| September 7 | 78°F | 54°F | 28% | 19% | 13 h |
| September 8 | 77°F | 53°F | 28% | 19% | 12 h 50 min |
| September 9 | 77°F | 53°F | 28% | 20% | 12 h 50 min |
| September 10 | 77°F | 53°F | 28% | 20% | 12 h 50 min |
| September 11 | 76°F | 52°F | 28% | 20% | 12 h 40 min |
| September 12 | 76°F | 52°F | 28% | 20% | 12 h 40 min |
| September 13 | 76°F | 51°F | 29% | 20% | 12 h 40 min |
| September 14 | 75°F | 51°F | 29% | 20% | 12 h 40 min |
| September 15 | 75°F | 51°F | 29% | 21% | 12 h 30 min |
| September 16 | 75°F | 50°F | 29% | 21% | 12 h 30 min |
| September 17 | 74°F | 50°F | 29% | 21% | 12 h 30 min |
| September 18 | 74°F | 50°F | 30% | 21% | 12 h 30 min |
| September 19 | 73°F | 49°F | 30% | 21% | 12 h 20 min |
| September 20 | 73°F | 49°F | 30% | 21% | 12 h 20 min |
| September 21 | 73°F | 48°F | 30% | 22% | 12 h 20 min |
| September 22 | 72°F | 48°F | 31% | 22% | 12 h 10 min |
| September 23 | 72°F | 48°F | 31% | 22% | 12 h 10 min |
| September 24 | 71°F | 47°F | 31% | 22% | 12 h 10 min |
| September 25 | 71°F | 47°F | 31% | 22% | 12 h 10 min |
| September 26 | 70°F | 46°F | 32% | 23% | 12 h |
| September 27 | 70°F | 46°F | 32% | 23% | 12 h |
| September 28 | 70°F | 46°F | 32% | 23% | 12 h |
| September 29 | 69°F | 45°F | 33% | 23% | 11 h 50 min |
| September 30 | 69°F | 45°F | 33% | 23% | 11 h 50 min |
- Normal high
- 74°FSeptember average
- Normal low
- 50°FSeptember average
- Precipitation
- 4.62 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 22
- Days at 80°F or more
- 9
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00190120; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Amherst in September?
On a given September day the chance of 0.01 inch or more is 29% on average, highest around September 30 (33%). In all, 4.62 in falls on 9 days of a normal September, 2 of them with an inch or more.
In a normal September in Amherst, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00190120.
What are the records for September in Amherst?
The warmest September temperature on this station's record (since 1893) is 99°F, on September 2, 1953; the coldest is 25°F, on September 29, 1914. The wettest September brought 14.55 in (1938).
The September mean against the 1991-2020 normal of 62.3°F: 2021 64.0°F (+1.7), 2022 62.2°F (−0.1), 2023 64.3°F (+2.0), 2024 63.1°F (+0.8), 2025 63.2°F (+0.9), 2026 62.0°F (−0.3). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 64.0°F | +1.7°F | 6.14 in |
| 2022 | 62.2°F | −0.1°F | 7.82 in |
| 2023 | 64.3°F | +2.0°F | 8.73 in |
| 2024 | 63.1°F | +0.8°F | 0.81 in |
| 2025 | 63.2°F | +0.9°F | 3.50 in |
| 2026 | 62.0°F | −0.3°F | 5.31 in |
Source: records: ACIS, station USC00190120; recent months: ACIS, station USC00190120. Records and recent months use complete months only.
How does September in Amherst compare across Massachusetts?
Across the 35 places PlainClimate covers in Massachusetts, September normal highs run from 70°F in East Sandwich to 78°F in Maynard; Amherst's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Amherst in August82°F by day, 58°F at night
- Amherst in October62°F by day, 39°F at night
- Amherst through the yearEvery month, frost dates, records and recent years
- Massachusetts in SeptemberThe statewide normal and the warmest and coolest places
- Maynard: Massachusetts's warmest Septembernormal high 78°F