September is one of the warmer months of the year in Haverhill, with average highs near 22.8°C and lows around 11.3°C (mean 17.1°C). It is about average for rainfall, averaging 93 mm of rainfall and 76% relative humidity across the period.
September is one of the warmer months of the year in Haverhill. Across 45 years of records, the warmest September in Haverhill was 2015 — when the month averaged 19.9°C — while the coldest was 1991 at 14.7°C. Typical September days reach 22.8°C with nights near 11.3°C. The long-term trend is warming, about 0.6°C per decade.
September is about average for rainfall in Haverhill, averaging 93 mm of rainfall. The wettest September on record was 1999 with 238 mm, while the driest was 1984 at 28 mm.
Relative humidity in Haverhill during September averages 76%. The most humid September was 2011 at 85%, and the least humid were 1995 and 2020 at 68%.
September receives about 4.2 kWh/m²/day of solar energy in Haverhill. The sunniest Septembers were 1984, 2007 and 2015 at 4.7 kWh/m²/day, and the cloudiest were 1993, 1996 and 2018 at 3.5.
Average wind speed in Haverhill during September is 0.2 m/s. The windiest Septembers were 2023, 2024 and 2025, among others at 0.2 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.0°C | 16.2°C | 17.2°C | 18.0°C | 18.1°C | +2.1°C |
| Avg High | 21.8°C | 21.9°C | 23.0°C | 23.7°C | 23.7°C | +1.9°C |
| Avg Low | 10.1°C | 10.6°C | 11.3°C | 12.3°C | 12.4°C | +2.3°C |
| Avg Rain | 81 mm | 112 mm | 93 mm | 90 mm | 87 mm | +6 mm |
September temperatures in Haverhill have risen by about 1.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 0.4°C (1991) to a record high of 36.6°C (2002).
Rainfall in September is about average for rainfall, averaging 93 mm, with a wettest year of 238 mm.
One of the best times to visit Haverhill
September is one of the best times to visit Haverhill. Expect days averaging 22.8°C and nights around 11.3°C (mean 17.1°C) — warmer than Haverhill's yearly average — with higher rainfall (93 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 24.9°C | 18.6°C | 12.2°C | 30.3°C | 6.4°C | 69 mm | 73% | 0.2 m/s | 4.5 |
| 2024 | 23.9°C | 17.9°C | 11.9°C | 29.3°C | 8.3°C | 38 mm | 74% | 0.2 m/s | 4.3 |
| 2023 | 23.1°C | 18.6°C | 14.0°C | 32.2°C | 6.7°C | 125 mm | 83% | 0.2 m/s | 3.8 |
| 2022 | 22.9°C | 17.4°C | 11.9°C | 31.4°C | 4.9°C | 114 mm | 76% | 0.2 m/s | 4.1 |
| 2021 | 23.2°C | 18.1°C | 13.0°C | 27.9°C | 7.8°C | 137 mm | 81% | 0.2 m/s | 4 |
| 2020 | 24.3°C | 17.9°C | 11.4°C | 31.7°C | 3.3°C | 36 mm | 68% | 0.2 m/s | 4.4 |
| 2019 | 23.3°C | 17.3°C | 11.4°C | 29.8°C | 5.3°C | 30 mm | 73% | 0.2 m/s | 4.5 |
| 2018 | 23.5°C | 18.5°C | 13.5°C | 32.5°C | 6.6°C | 147 mm | 80% | 0.2 m/s | 3.5 |
| 2017 | 24.4°C | 18.8°C | 13.2°C | 32.2°C | 6.8°C | 83 mm | 77% | 0.2 m/s | 4.1 |
| 2016 | 24.8°C | 18.8°C | 12.9°C | 30.8°C | 4.2°C | 56 mm | 70% | 0.2 m/s | 4.1 |
| 2015 🔥 | 26.4°C | 19.9°C | 13.4°C | 32.9°C | 4.0°C | 133 mm | 72% | 0.2 m/s | 4.7 |
| 2014 | 23.3°C | 17.3°C | 11.3°C | 31.3°C | 4.1°C | 34 mm | 76% | 0.2 m/s | 4.5 |
| 2013 | 22.0°C | 16.1°C | 10.2°C | 32.7°C | 3.9°C | 121 mm | 78% | 0.2 m/s | 4.6 |
| 2012 | 22.2°C | 16.5°C | 10.8°C | 29.3°C | 5.6°C | 104 mm | 76% | 0.2 m/s | 4.2 |
| 2011 | 22.9°C | 18.0°C | 13.1°C | 29.1°C | 4.6°C | 139 mm | 85% | 0.2 m/s | 4 |
| 2010 | 23.8°C | 18.3°C | 12.9°C | 33.8°C | 6.4°C | 57 mm | 74% | 0.2 m/s | 4.1 |
| 2009 | 20.8°C | 15.4°C | 9.9°C | 26.0°C | 3.5°C | 41 mm | 80% | 0.2 m/s | 4.5 |
| 2008 | 21.8°C | 16.7°C | 11.6°C | 29.8°C | 5.5°C | 220 mm | 83% | 0.2 m/s | 4.1 |
| 2007 | 23.9°C | 17.6°C | 11.3°C | 33.1°C | 5.1°C | 75 mm | 74% | 0.2 m/s | 4.7 |
| 2006 | 21.0°C | 15.9°C | 10.8°C | 26.4°C | 4.0°C | 65 mm | 82% | 0.2 m/s | 4 |
| 2005 | 25.0°C | 18.8°C | 12.7°C | 31.2°C | 6.0°C | 56 mm | 73% | 0.2 m/s | 4.5 |
| 2004 | 22.4°C | 16.8°C | 11.1°C | 27.3°C | 5.9°C | 136 mm | 80% | 0.2 m/s | 4.2 |
| 2003 | 22.8°C | 17.3°C | 11.8°C | 27.8°C | 6.5°C | 105 mm | 80% | 0.2 m/s | 3.9 |
| 2002 | 25.8°C | 19.3°C | 12.8°C | 36.6°C | 5.8°C | 87 mm | 70% | 0.2 m/s | 4.3 |
| 2001 | 24.1°C | 17.7°C | 11.3°C | 32.9°C | 6.4°C | 75 mm | 70% | 0.2 m/s | 4.6 |
| 2000 | 22.2°C | 16.0°C | 9.9°C | 30.7°C | 0.5°C | 71 mm | 74% | 0.2 m/s | 4.2 |
| 1999 🌧️ | 23.9°C | 18.4°C | 12.8°C | 34.6°C | 6.3°C | 238 mm | 79% | 0.2 m/s | 3.9 |
| 1998 | 23.8°C | 17.3°C | 10.9°C | 28.9°C | 3.5°C | 58 mm | 75% | 0.2 m/s | 4.4 |
| 1997 | 22.0°C | 16.2°C | 10.4°C | 27.1°C | 2.9°C | 52 mm | 74% | 0.2 m/s | 4 |
| 1996 | 21.3°C | 16.6°C | 12.0°C | 29.0°C | 4.4°C | 131 mm | 81% | 0.2 m/s | 3.5 |
| 1995 | 21.9°C | 15.5°C | 9.1°C | 29.3°C | 2.8°C | 71 mm | 68% | 0.2 m/s | 4.3 |
| 1994 | 20.7°C | 15.6°C | 10.5°C | 28.7°C | 7.5°C | 149 mm | 78% | 0.2 m/s | 3.9 |
| 1993 | 21.7°C | 16.2°C | 10.7°C | 31.4°C | 2.0°C | 124 mm | 75% | 0.2 m/s | 3.5 |
| 1992 | 21.8°C | 15.9°C | 10.1°C | 29.3°C | 1.2°C | 80 mm | 74% | 0.2 m/s | 4.1 |
| 1991 ❄️ | 20.2°C | 14.7°C | 9.2°C | 29.2°C | 0.4°C | 164 mm | 77% | 0.2 m/s | 4.3 |
| 1990 | 21.6°C | 15.9°C | 10.1°C | 27.9°C | 2.5°C | 54 mm | 76% | 0.2 m/s | 4.2 |
| 1989 | 22.1°C | 16.2°C | 10.3°C | 32.3°C | 1.6°C | 111 mm | 76% | 0.2 m/s | 4.3 |
| 1988 | 21.4°C | 15.3°C | 9.1°C | 26.3°C | 3.3°C | 53 mm | 73% | 0.2 m/s | 4.5 |
| 1987 | 20.6°C | 15.7°C | 10.8°C | 28.1°C | 2.9°C | 163 mm | 79% | 0.2 m/s | 3.9 |
| 1986 | 21.0°C | 15.1°C | 9.3°C | 28.6°C | 4.5°C | 61 mm | 74% | 0.2 m/s | 3.9 |
| 1985 | 22.1°C | 16.3°C | 10.5°C | 28.9°C | 4.7°C | 117 mm | 77% | 0.2 m/s | 4 |
| 1984 | 20.8°C | 14.9°C | 8.9°C | 26.8°C | 4.3°C | 28 mm | 72% | 0.2 m/s | 4.7 |
| 1983 | 24.7°C | 18.0°C | 11.3°C | 32.6°C | 5.1°C | 34 mm | 68% | 0.2 m/s | — |
| 1982 | 22.0°C | 16.3°C | 10.5°C | 29.7°C | 7.4°C | 56 mm | 77% | 0.2 m/s | — |
| 1981 | 21.5°C | 15.9°C | 10.2°C | 28.1°C | 3.2°C | 106 mm | 74% | 0.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 22.8°C with lows near 11.3°C (mean 17.1°C), based on 45 years of NASA POWER data.
September averages 93 mm of rainfall in Haverhill, about average for rainfall. The wettest on record was 238 mm in 1999.
The hottest September reached 36.6°C in 2002. The coldest dipped to 0.4°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.8°C. Daytime highs moved from 22.2°C to 23.6°C and overnight lows from 10.3°C to 12.6°C over the same span.
September is one of the warmer months of the year in Haverhill and about average for rainfall, so plan for around 22.8°C daytime highs and 11.3°C at night.
Not quite — September is the 9th coolest month in Haverhill, averaging 17.1°C.
For September in Haverhill, pack light layers you can adjust through the day, with typical highs of 22.8°C and lows of 11.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 76% — quite humid.
Average wind speed in September is 0.2 m/s. The windiest September on record averaged 0.2 m/s (1981).
The wettest September on record was 1999 with 238 mm. On average, September sees 93 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Haverhill behaves each September, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for September specifically, along with year-by-year records and how the month has changed over the decades.
