September is one of the warmer months of the year in Worcester, with average highs near 23.2°C and lows around 11.1°C (mean 17.2°C). It is about average for rainfall, averaging 100 mm of rainfall and 74% relative humidity across the period.
September is one of the warmer months of the year in Worcester. Across 45 years of records, the warmest September in Worcester was 2015 — when the month averaged 20°C — while the coldest was 1991 at 14.7°C. Typical September days reach 23.2°C with nights near 11.1°C. The long-term trend is warming, about 0.6°C per decade.
September is about average for rainfall in Worcester, averaging 100 mm of rainfall. The wettest September on record was 1999 with 229 mm, while the driest was 2024 at 33 mm.
Relative humidity in Worcester during September averages 74%. The most humid September was 2011 at 85%, and the least humid was 1983 at 64%.
September receives about 4.2 kWh/m²/day of solar energy in Worcester. 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 Worcester during September is 0.1 m/s. The windiest Septembers were 2023, 2024 and 2025, among others at 0.1 m/s, while the calmest was 2010 at 0 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.1°C | 16.4°C | 17.4°C | 18.1°C | 18.0°C | +1.9°C |
| Avg High | 22.3°C | 22.3°C | 23.6°C | 24.1°C | 23.9°C | +1.6°C |
| Avg Low | 9.9°C | 10.4°C | 11.2°C | 12.1°C | 12.1°C | +2.2°C |
| Avg Rain | 82 mm | 112 mm | 97 mm | 102 mm | 107 mm | +26 mm |
September temperatures in Worcester have risen by about 1.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -0.5°C (2000) to a record high of 36.7°C (2002).
Rainfall in September is about average for rainfall, averaging 100 mm, with a wettest year of 229 mm.
One of the best times to visit Worcester
September is one of the best times to visit Worcester. Expect days averaging 23.2°C and nights around 11.1°C (mean 17.2°C) — warmer than Worcester's yearly average — with higher rainfall (100 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 | 25.1°C | 18.6°C | 12.1°C | 29.8°C | 7.5°C | 82 mm | 72% | 0.1 m/s | 4.5 |
| 2024 | 24.8°C | 18.2°C | 11.6°C | 30.7°C | 8.5°C | 33 mm | 71% | 0.1 m/s | 4.3 |
| 2023 | 22.8°C | 18.2°C | 13.5°C | 33.0°C | 6.9°C | 173 mm | 83% | 0.1 m/s | 3.8 |
| 2022 | 23.0°C | 17.3°C | 11.7°C | 31.9°C | 4.7°C | 143 mm | 76% | 0.1 m/s | 4.1 |
| 2021 | 23.0°C | 17.8°C | 12.5°C | 27.5°C | 7.1°C | 166 mm | 82% | 0.1 m/s | 4 |
| 2020 | 24.5°C | 17.9°C | 11.3°C | 32.0°C | 3.1°C | 46 mm | 66% | 0.1 m/s | 4.4 |
| 2019 | 24.2°C | 17.6°C | 11.1°C | 31.1°C | 4.0°C | 37 mm | 70% | 0.1 m/s | 4.5 |
| 2018 | 23.6°C | 18.5°C | 13.4°C | 32.6°C | 6.3°C | 188 mm | 81% | 0.1 m/s | 3.5 |
| 2017 | 24.7°C | 18.8°C | 13.0°C | 33.2°C | 6.1°C | 85 mm | 75% | 0.1 m/s | 4.1 |
| 2016 | 25.3°C | 19.0°C | 12.8°C | 33.0°C | 3.7°C | 66 mm | 68% | 0.1 m/s | 4.1 |
| 2015 🔥 | 26.9°C | 20.0°C | 13.1°C | 33.9°C | 5.2°C | 138 mm | 70% | 0.1 m/s | 4.7 |
| 2014 | 23.9°C | 17.4°C | 11.0°C | 31.4°C | 3.7°C | 40 mm | 73% | 0.1 m/s | 4.5 |
| 2013 | 22.2°C | 16.0°C | 9.8°C | 32.8°C | 3.7°C | 96 mm | 75% | 0.1 m/s | 4.6 |
| 2012 | 22.7°C | 16.7°C | 10.7°C | 29.5°C | 5.1°C | 122 mm | 75% | 0.1 m/s | 4.2 |
| 2011 | 23.1°C | 18.1°C | 13.1°C | 28.8°C | 4.0°C | 181 mm | 85% | 0.1 m/s | 4 |
| 2010 | 24.8°C | 18.9°C | 13.1°C | 35.3°C | 6.1°C | 65 mm | 70% | 0 m/s | 4.1 |
| 2009 | 21.2°C | 15.4°C | 9.7°C | 26.3°C | 3.0°C | 45 mm | 77% | 0.1 m/s | 4.5 |
| 2008 | 22.2°C | 16.8°C | 11.5°C | 30.3°C | 4.7°C | 206 mm | 81% | 0.1 m/s | 4.1 |
| 2007 | 25.4°C | 18.4°C | 11.4°C | 34.2°C | 4.3°C | 69 mm | 69% | 0.1 m/s | 4.7 |
| 2006 | 21.5°C | 16.0°C | 10.4°C | 27.2°C | 3.2°C | 60 mm | 79% | 0.1 m/s | 4 |
| 2005 | 26.1°C | 19.4°C | 12.7°C | 32.8°C | 6.6°C | 58 mm | 69% | 0.1 m/s | 4.5 |
| 2004 | 23.5°C | 17.3°C | 11.2°C | 29.3°C | 5.7°C | 177 mm | 78% | 0.1 m/s | 4.2 |
| 2003 | 23.2°C | 17.4°C | 11.6°C | 27.9°C | 6.7°C | 121 mm | 79% | 0.1 m/s | 3.9 |
| 2002 | 25.9°C | 19.3°C | 12.7°C | 36.7°C | 5.6°C | 83 mm | 69% | 0.1 m/s | 4.3 |
| 2001 | 24.2°C | 17.6°C | 11.0°C | 32.4°C | 5.8°C | 78 mm | 69% | 0.1 m/s | 4.6 |
| 2000 | 22.6°C | 16.1°C | 9.6°C | 29.9°C | -0.5°C | 78 mm | 73% | 0.1 m/s | 4.2 |
| 1999 🌧️ | 24.0°C | 18.3°C | 12.5°C | 35.1°C | 5.5°C | 229 mm | 77% | 0.1 m/s | 3.9 |
| 1998 | 25.0°C | 18.0°C | 11.0°C | 31.0°C | 3.2°C | 55 mm | 69% | 0.1 m/s | 4.4 |
| 1997 | 22.7°C | 16.5°C | 10.3°C | 28.0°C | 2.7°C | 44 mm | 71% | 0.1 m/s | 4 |
| 1996 | 22.0°C | 16.8°C | 11.7°C | 30.3°C | 3.9°C | 155 mm | 79% | 0.1 m/s | 3.5 |
| 1995 | 22.4°C | 15.8°C | 9.1°C | 29.6°C | 2.5°C | 78 mm | 66% | 0.1 m/s | 4.3 |
| 1994 | 20.9°C | 15.6°C | 10.3°C | 28.6°C | 6.6°C | 121 mm | 76% | 0.1 m/s | 3.9 |
| 1993 | 21.6°C | 16.1°C | 10.5°C | 31.0°C | 1.6°C | 138 mm | 76% | 0.1 m/s | 3.5 |
| 1992 | 22.0°C | 15.9°C | 9.9°C | 29.2°C | 0.7°C | 79 mm | 74% | 0.1 m/s | 4.1 |
| 1991 ❄️ | 20.5°C | 14.7°C | 8.9°C | 29.9°C | -0.4°C | 173 mm | 76% | 0.1 m/s | 4.3 |
| 1990 | 21.7°C | 15.8°C | 9.8°C | 27.8°C | 1.8°C | 46 mm | 76% | 0.1 m/s | 4.2 |
| 1989 | 22.0°C | 16.0°C | 10.1°C | 31.7°C | 1.0°C | 123 mm | 78% | 0.1 m/s | 4.3 |
| 1988 | 21.7°C | 15.2°C | 8.7°C | 26.2°C | 3.0°C | 54 mm | 72% | 0.1 m/s | 4.5 |
| 1987 | 20.9°C | 15.8°C | 10.7°C | 27.5°C | 2.1°C | 160 mm | 79% | 0.1 m/s | 3.9 |
| 1986 | 21.5°C | 15.4°C | 9.2°C | 28.8°C | 3.6°C | 45 mm | 72% | 0.1 m/s | 3.9 |
| 1985 | 22.8°C | 16.6°C | 10.4°C | 29.0°C | 3.8°C | 104 mm | 76% | 0.1 m/s | 4 |
| 1984 | 21.4°C | 15.0°C | 8.5°C | 28.3°C | 4.0°C | 35 mm | 69% | 0.1 m/s | 4.7 |
| 1983 | 25.5°C | 18.3°C | 11.2°C | 33.7°C | 4.1°C | 41 mm | 64% | 0.1 m/s | — |
| 1982 | 23.0°C | 16.8°C | 10.5°C | 30.3°C | 7.0°C | 62 mm | 74% | 0.1 m/s | — |
| 1981 | 21.7°C | 15.7°C | 9.8°C | 28.5°C | 1.9°C | 109 mm | 73% | 0.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 23.2°C with lows near 11.1°C (mean 17.2°C), based on 45 years of NASA POWER data.
September averages 100 mm of rainfall in Worcester, about average for rainfall. The wettest on record was 229 mm in 1999.
The hottest September reached 36.7°C in 2002. The coldest dipped to -0.5°C in 2000.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.5°C. Daytime highs moved from 22.9°C to 23.7°C and overnight lows from 10.1°C to 12.3°C over the same span.
September is one of the warmer months of the year in Worcester and about average for rainfall, so plan for around 23.2°C daytime highs and 11.1°C at night.
Not quite — September is the 9th coolest month in Worcester, averaging 17.2°C.
For September in Worcester, pack light layers you can adjust through the day, with typical highs of 23.2°C and lows of 11.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 74% — moderately humid.
Average wind speed in September is 0.1 m/s. The windiest September on record averaged 0.1 m/s (1981).
The wettest September on record was 1999 with 229 mm. On average, September sees 100 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 Worcester 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.
