Manchester weather in September: Manchester, New Hampshire: normal highs, lows, rain and records for September
Manchester in September has a normal high of 75°F and a normal low of 54°F, a daily mean of 64°F, falling from 80°F on the 1st to 69°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 3.72 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 12°C, 94 mm of precipitation in September.
- NOAA stationManchester Airport
- Station IDUSW00014710
- Location42.93°N 71.44°W
- Elevation225 ft (69 m)
- From the center4 miles
- Population116,386
- Jan 34° 17°
- Feb 37° 19°
- Mar 46° 27°
- Apr 59° 38°
- May 70° 48°
- Jun 79° 58°
- Jul 84° 64°
- Aug 82° 62°
- Sep 75° 54°
- Oct 62° 42°
- Nov 50° 33°
- Dec 39° 24°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Manchester in September?
The normal high is 75°F and the normal low 54°F, for a daily mean of 64.3°F. September is 7.9°F cooler than August and 12.1°F warmer than October. September is the 4th warmest month of the year in Manchester and the 3rd wettest. Across the month the normal high falls 11°F, from 80°F on September 1 to 69°F on September 30. From one year to the next September's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 62°F and 66°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 34%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 80°F | 59°F | 30% | 18% |
| September 8 | 78°F | 57°F | 30% | 18% |
| September 15 | 75°F | 55°F | 31% | 18% |
| September 22 | 72°F | 52°F | 32% | 19% |
| September 30 | 69°F | 48°F | 34% | 20% |
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 | 80°F | 59°F | 30% | 18% | 13 h 10 min |
| September 2 | 79°F | 59°F | 30% | 18% | 13 h 10 min |
| September 3 | 79°F | 59°F | 30% | 18% | 13 h 10 min |
| September 4 | 79°F | 58°F | 30% | 18% | 13 h 10 min |
| September 5 | 79°F | 58°F | 30% | 18% | 13 h |
| September 6 | 78°F | 58°F | 30% | 18% | 13 h |
| September 7 | 78°F | 57°F | 30% | 18% | 13 h |
| September 8 | 78°F | 57°F | 30% | 18% | 12 h 50 min |
| September 9 | 77°F | 57°F | 30% | 18% | 12 h 50 min |
| September 10 | 77°F | 56°F | 30% | 18% | 12 h 50 min |
| September 11 | 77°F | 56°F | 30% | 18% | 12 h 50 min |
| September 12 | 76°F | 56°F | 30% | 18% | 12 h 40 min |
| September 13 | 76°F | 55°F | 31% | 18% | 12 h 40 min |
| September 14 | 75°F | 55°F | 31% | 18% | 12 h 40 min |
| September 15 | 75°F | 55°F | 31% | 18% | 12 h 30 min |
| September 16 | 75°F | 54°F | 31% | 18% | 12 h 30 min |
| September 17 | 74°F | 54°F | 31% | 19% | 12 h 30 min |
| September 18 | 74°F | 53°F | 31% | 19% | 12 h 30 min |
| September 19 | 73°F | 53°F | 31% | 19% | 12 h 20 min |
| September 20 | 73°F | 53°F | 31% | 19% | 12 h 20 min |
| September 21 | 73°F | 52°F | 32% | 19% | 12 h 20 min |
| September 22 | 72°F | 52°F | 32% | 19% | 12 h 10 min |
| September 23 | 72°F | 51°F | 32% | 19% | 12 h 10 min |
| September 24 | 71°F | 51°F | 32% | 20% | 12 h 10 min |
| September 25 | 71°F | 50°F | 33% | 20% | 12 h 10 min |
| September 26 | 70°F | 50°F | 33% | 20% | 12 h |
| September 27 | 70°F | 50°F | 33% | 20% | 12 h |
| September 28 | 70°F | 49°F | 33% | 20% | 12 h |
| September 29 | 69°F | 49°F | 34% | 20% | 11 h 50 min |
| September 30 | 69°F | 48°F | 34% | 20% | 11 h 50 min |
- Normal high
- 75°FSeptember average
- Normal low
- 54°FSeptember average
- Precipitation
- 3.72 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
- 8
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014710; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Manchester in September?
On a given September day the chance of 0.01 inch or more is 31% on average, highest around September 30 (34%). In all, 3.72 in falls on 9 days of a normal September, 1 of them with an inch or more.
In a normal September in Manchester, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014710.
How humid and windy is Manchester in September?
At 3 p.m. the normal temperature is 67°F with 50% relative humidity and a dew point of 48°F; at 6 a.m. it is 52°F with 86% humidity. The wind averages 5.6 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. | 52°F | 48°F | 86% | 4.2 mph | – |
| 9 a.m. | 59°F | 49°F | 69% | 6.4 mph | – |
| noon | 65°F | 48°F | 54% | 8.4 mph | – |
| 3 p.m. | 67°F | 48°F | 50% | 8.4 mph | – |
| 6 p.m. | 62°F | 49°F | 63% | 6.3 mph | – |
| 9 p.m. | 57°F | 50°F | 76% | 4.0 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014710. 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 Manchester?
The warmest September temperature on Manchester's official record (since 1885) is 100°F, on September 2, 1953; the coldest is 28°F, on September 24, 1953. The wettest September brought 9.55 in (1888).
The September mean against the 1991-2020 normal of 64.3°F: 2021 67.0°F (+2.8), 2022 63.5°F (−0.8), 2023 66.9°F (+2.6), 2024 65.3°F (+1.0), 2025 64.1°F (−0.2), 2026 62.6°F (−1.7). 3 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 67.0°F | +2.8°F | 5.78 in |
| 2022 | 63.5°F | −0.8°F | 6.02 in |
| 2023 | 66.9°F | +2.6°F | 5.75 in |
| 2024 | 65.3°F | +1.0°F | 1.58 in |
| 2025 | 64.1°F | −0.2°F | 3.22 in |
| 2026 | 62.6°F | −1.7°F | 4.02 in |
Source: records: ACIS, NWS threaded record MHTthr; recent months: ACIS, station USW00014710. Records and recent months use complete months only.
How does September in Manchester 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; Manchester's is 75°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Manchester in August82°F by day, 62°F at night
- Manchester in October62°F by day, 42°F at night
- Manchester through the yearEvery month, frost dates, records and recent years
- New Hampshire in SeptemberThe statewide normal and the warmest and coolest places
- Nashua: New Hampshire's warmest Septembernormal high 75°F