Keene weather in September: Keene, New Hampshire: normal highs, lows, rain and records for September
Keene in September has a normal high of 73°F and a normal low of 47°F, a daily mean of 60°F, falling from 78°F on the 1st to 67°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 4.26 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 8°C, 108 mm of precipitation in September.
- NOAA stationKeene
- Station IDUSC00274399
- Location42.94°N 72.32°W
- Elevation511 ft (156 m)
- From the center1 miles
- Population23,036
- Jan 30° 10°
- Feb 34° 11°
- Mar 43° 20°
- Apr 57° 30°
- May 69° 41°
- Jun 77° 51°
- Jul 82° 56°
- Aug 81° 54°
- Sep 73° 47°
- Oct 60° 36°
- Nov 47° 27°
- Dec 36° 18°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Keene in September?
The normal high is 73°F and the normal low 47°F, for a daily mean of 60.1°F. September is 7.4°F cooler than August and 12.3°F warmer than October. September is the 4th warmest month of the year in Keene and the 5th wettest. Across the month the normal high falls 11°F, from 78°F on September 1 to 67°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 58°F and 62°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 | 78°F | 52°F | 31% | 20% |
| September 8 | 76°F | 50°F | 31% | 20% |
| September 15 | 74°F | 47°F | 32% | 21% |
| September 22 | 71°F | 45°F | 34% | 22% |
| September 30 | 67°F | 42°F | 36% | 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 | 78°F | 52°F | 31% | 20% | 13 h 10 min |
| September 2 | 78°F | 51°F | 31% | 20% | 13 h 10 min |
| September 3 | 78°F | 51°F | 31% | 20% | 13 h 10 min |
| September 4 | 77°F | 51°F | 31% | 20% | 13 h 10 min |
| September 5 | 77°F | 51°F | 31% | 20% | 13 h |
| September 6 | 77°F | 50°F | 31% | 20% | 13 h |
| September 7 | 76°F | 50°F | 31% | 20% | 13 h |
| September 8 | 76°F | 50°F | 31% | 20% | 12 h 50 min |
| September 9 | 76°F | 49°F | 31% | 20% | 12 h 50 min |
| September 10 | 76°F | 49°F | 32% | 20% | 12 h 50 min |
| September 11 | 75°F | 49°F | 32% | 21% | 12 h 50 min |
| September 12 | 75°F | 49°F | 32% | 21% | 12 h 40 min |
| September 13 | 74°F | 48°F | 32% | 21% | 12 h 40 min |
| September 14 | 74°F | 48°F | 32% | 21% | 12 h 40 min |
| September 15 | 74°F | 47°F | 32% | 21% | 12 h 30 min |
| September 16 | 73°F | 47°F | 33% | 21% | 12 h 30 min |
| September 17 | 73°F | 47°F | 33% | 21% | 12 h 30 min |
| September 18 | 73°F | 46°F | 33% | 21% | 12 h 30 min |
| September 19 | 72°F | 46°F | 33% | 21% | 12 h 20 min |
| September 20 | 72°F | 46°F | 33% | 21% | 12 h 20 min |
| September 21 | 71°F | 45°F | 34% | 22% | 12 h 20 min |
| September 22 | 71°F | 45°F | 34% | 22% | 12 h 10 min |
| September 23 | 70°F | 44°F | 34% | 22% | 12 h 10 min |
| September 24 | 70°F | 44°F | 35% | 22% | 12 h 10 min |
| September 25 | 70°F | 44°F | 35% | 22% | 12 h 10 min |
| September 26 | 69°F | 43°F | 35% | 22% | 12 h |
| September 27 | 69°F | 43°F | 35% | 23% | 12 h |
| September 28 | 68°F | 42°F | 36% | 23% | 12 h |
| September 29 | 68°F | 42°F | 36% | 23% | 11 h 50 min |
| September 30 | 67°F | 42°F | 36% | 23% | 11 h 50 min |
- Normal high
- 73°FSeptember average
- Normal low
- 47°FSeptember average
- Precipitation
- 4.26 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 1
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 21
- Days at 80°F or more
- 8
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00274399; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Keene in September?
On a given September day the chance of 0.01 inch or more is 33% on average, highest around September 30 (36%). In all, 4.26 in falls on 10 days of a normal September, 1 of them with an inch or more.
In a normal September in Keene, 1 days reach 90°F and 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00274399.
What are the records for September in Keene?
The warmest September temperature on this station's record (since 1893) is 101°F, on September 2, 1953; the coldest is 19°F, on September 29, 1914. The wettest September brought 9.64 in (2011).
The September mean against the 1991-2020 normal of 60.1°F: 2021 61.6°F (+1.5), 2022 59.8°F (−0.3), 2023 62.2°F (+2.1), 2024 60.6°F (+0.5), 2025 61.2°F (+1.1), 2026 59.5°F (−0.6). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 61.6°F | +1.5°F | 5.83 in |
| 2022 | 59.8°F | −0.3°F | 7.25 in |
| 2023 | 62.2°F | +2.1°F | 3.28 in |
| 2024 | 60.6°F | +0.5°F | 1.47 in |
| 2025 | 61.2°F | +1.1°F | 3.21 in |
| 2026 | 59.5°F | −0.6°F | 3.18 in |
Source: records: ACIS, station USC00274399; recent months: ACIS, station USC00274399. Records and recent months use complete months only.
How does September in Keene compare across New Hampshire?
Across the 28 places PlainClimate covers in New Hampshire, September normal highs run from 68°F in Colebrook to 75°F in Nashua; Keene's is 73°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.