September is close to Salem's year-round average, with average highs near 32.6°C and lows around 22.4°C (mean 27.5°C). It is a relatively wet time of year, averaging 118 mm of rainfall and 72% relative humidity across the period.
September is close to Salem's year-round average. Across 45 years of records, the warmest September in Salem was 2002 — when the month averaged 29.3°C — while the coldest was 1983 at 25.4°C. Typical September days reach 32.6°C with nights near 22.4°C. The long-term trend is warming, about 0.2°C per decade.
September is a relatively wet time of year in Salem, averaging 118 mm of rainfall. The wettest September on record was 1983 with 250 mm, while the driest was 2016 at 14 mm.
Relative humidity in Salem during September averages 72%. The most humid September was 1981 at 83%, and the least humid was 2016 at 60%.
September receives about 5.4 kWh/m²/day of solar energy in Salem. The sunniest Septembers were 2002 and 2003 at 6.1 kWh/m²/day, and the cloudiest were 1996 and 2020 at 4.8.
Average wind speed in Salem during September is 2 m/s. The windiest September was 2016 at 2.5 m/s, while the calmest were 2004 and 2017 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.0°C | 27.6°C | 27.6°C | 27.7°C | 27.5°C | +0.5°C |
| Avg High | 32.0°C | 32.8°C | 32.6°C | 33.0°C | 32.5°C | +0.5°C |
| Avg Low | 22.0°C | 22.4°C | 22.5°C | 22.5°C | 22.5°C | +0.5°C |
| Avg Rain | 146 mm | 115 mm | 103 mm | 120 mm | 105 mm | -41 mm |
September temperatures in Salem have risen by about 1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 18.2°C (1983) to a record high of 38.9°C (1982).
Rainfall in September is a relatively wet time of year, averaging 118 mm, with a wettest year of 250 mm.
A quieter season to visit Salem
If your dates are flexible, the more temperate months of January and December tend to be the most comfortable for visiting Salem. That said, September — with days averaging 32.6°C and nights around 22.4°C (mean 27.5°C) and higher rainfall (118 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 33.8°C | 28.6°C | 23.4°C | 37.7°C | 22.0°C | 115 mm | 70% | 1.9 m/s | 5.3 |
| 2024 | 34.2°C | 28.6°C | 22.9°C | 37.1°C | 21.8°C | 19 mm | 70% | 2.3 m/s | 5.8 |
| 2023 | 33.0°C | 27.8°C | 22.6°C | 35.6°C | 21.0°C | 120 mm | 74% | 2.3 m/s | 5.6 |
| 2022 | 31.3°C | 26.7°C | 22.0°C | 33.6°C | 20.4°C | 86 mm | 78% | 1.7 m/s | 5.4 |
| 2021 | 31.9°C | 27.0°C | 22.2°C | 34.5°C | 20.5°C | 144 mm | 77% | 2 m/s | 5.3 |
| 2020 | 30.7°C | 26.4°C | 22.0°C | 33.6°C | 20.2°C | 144 mm | 80% | 2.1 m/s | 4.8 |
| 2019 | 31.4°C | 26.9°C | 22.4°C | 35.2°C | 21.5°C | 174 mm | 78% | 2 m/s | 5.1 |
| 2018 | 34.9°C | 28.9°C | 23.0°C | 38.9°C | 20.5°C | 122 mm | 66% | 1.8 m/s | 5.6 |
| 2017 | 30.3°C | 26.3°C | 22.3°C | 33.2°C | 19.8°C | 204 mm | 82% | 1.6 m/s | 5.2 |
| 2016 | 35.2°C | 29.0°C | 22.9°C | 38.3°C | 21.3°C | 14 mm | 60% | 2.5 m/s | 5.4 |
| 2015 | 34.6°C | 29.0°C | 23.4°C | 38.3°C | 21.8°C | 84 mm | 65% | 2 m/s | 5.6 |
| 2014 | 34.0°C | 28.4°C | 22.8°C | 37.0°C | 20.8°C | 101 mm | 68% | 2.2 m/s | 5.5 |
| 2013 | 31.0°C | 26.4°C | 21.9°C | 34.0°C | 19.2°C | 161 mm | 78% | 1.9 m/s | 5.6 |
| 2012 | 33.1°C | 27.7°C | 22.3°C | 36.2°C | 20.5°C | 129 mm | 70% | 2 m/s | 5.6 |
| 2011 | 33.6°C | 27.9°C | 22.1°C | 35.8°C | 20.6°C | 125 mm | 70% | 2.2 m/s | 5.9 |
| 2010 | 32.0°C | 26.9°C | 21.8°C | 34.3°C | 20.3°C | 88 mm | 76% | 1.9 m/s | 5.1 |
| 2009 | 33.7°C | 28.2°C | 22.8°C | 37.4°C | 21.0°C | 93 mm | 70% | 2.3 m/s | 5.7 |
| 2008 | 32.0°C | 26.8°C | 21.5°C | 35.4°C | 20.1°C | 41 mm | 75% | 1.9 m/s | 5.6 |
| 2007 | 31.8°C | 27.0°C | 22.1°C | 34.4°C | 20.2°C | 70 mm | 76% | 2.2 m/s | 5.3 |
| 2006 | 32.3°C | 27.3°C | 22.3°C | 35.4°C | 20.8°C | 73 mm | 74% | 2.3 m/s | 5.4 |
| 2005 | 32.8°C | 27.8°C | 22.7°C | 36.4°C | 21.0°C | 99 mm | 73% | 2.2 m/s | 5.5 |
| 2004 | 30.6°C | 26.4°C | 22.3°C | 36.4°C | 20.9°C | 245 mm | 78% | 1.6 m/s | 4.9 |
| 2003 | 34.3°C | 28.5°C | 22.6°C | 37.4°C | 21.3°C | 83 mm | 67% | 2.1 m/s | 6.1 |
| 2002 🔥 | 35.5°C | 29.3°C | 23.2°C | 38.9°C | 20.9°C | 57 mm | 61% | 2.2 m/s | 6.1 |
| 2001 | 31.5°C | 27.1°C | 22.7°C | 36.6°C | 21.4°C | 125 mm | 74% | 1.7 m/s | 5.5 |
| 2000 | 31.9°C | 27.2°C | 22.6°C | 35.8°C | 21.4°C | 139 mm | 75% | 1.7 m/s | 5.4 |
| 1999 | 35.0°C | 29.1°C | 23.2°C | 37.7°C | 21.1°C | 66 mm | 61% | 2.2 m/s | 5.9 |
| 1998 | 31.3°C | 26.7°C | 22.1°C | 34.9°C | 20.5°C | 131 mm | 78% | 2.1 m/s | 5.3 |
| 1997 | 32.7°C | 27.7°C | 22.7°C | 37.6°C | 20.6°C | 104 mm | 72% | 1.9 m/s | 5.4 |
| 1996 | 30.5°C | 26.1°C | 21.8°C | 33.3°C | 20.2°C | 139 mm | 80% | 2 m/s | 4.8 |
| 1995 | 33.3°C | 27.9°C | 22.4°C | 36.2°C | 20.8°C | 83 mm | 70% | 2.3 m/s | 5.3 |
| 1994 | 34.7°C | 28.6°C | 22.5°C | 38.3°C | 19.1°C | 79 mm | 63% | 2.3 m/s | 5.6 |
| 1993 | 33.0°C | 27.5°C | 22.1°C | 35.7°C | 20.8°C | 75 mm | 70% | 1.8 m/s | 5.3 |
| 1992 | 32.0°C | 27.2°C | 22.3°C | 36.3°C | 21.3°C | 178 mm | 72% | 2 m/s | 5.1 |
| 1991 | 32.1°C | 27.2°C | 22.4°C | 35.5°C | 20.2°C | 153 mm | 73% | 1.7 m/s | 5.6 |
| 1990 | 33.0°C | 27.8°C | 22.6°C | 37.6°C | 21.0°C | 137 mm | 69% | 1.9 m/s | 5.2 |
| 1989 | 32.4°C | 27.3°C | 22.2°C | 37.2°C | 20.0°C | 115 mm | 71% | 1.9 m/s | 5 |
| 1988 | 30.4°C | 26.1°C | 21.8°C | 33.7°C | 19.4°C | 171 mm | 81% | 2 m/s | 5.2 |
| 1987 | 33.5°C | 28.3°C | 23.1°C | 38.1°C | 21.7°C | 85 mm | 69% | 1.7 m/s | 5.5 |
| 1986 | 32.8°C | 27.5°C | 22.3°C | 36.8°C | 21.0°C | 147 mm | 70% | 1.9 m/s | 5.7 |
| 1985 | 32.1°C | 27.0°C | 21.9°C | 36.8°C | 20.3°C | 138 mm | 71% | 1.8 m/s | 5.3 |
| 1984 | 33.0°C | 27.6°C | 22.2°C | 36.1°C | 19.5°C | 123 mm | 69% | 1.8 m/s | 5.4 |
| 1983 ❄️ 🌧️ | 29.8°C | 25.4°C | 20.9°C | 32.2°C | 18.2°C | 250 mm | 82% | 2.2 m/s | — |
| 1982 | 34.1°C | 28.1°C | 22.1°C | 38.9°C | 20.5°C | 74 mm | 64% | 2.3 m/s | — |
| 1981 | 29.5°C | 25.6°C | 21.7°C | 32.6°C | 20.0°C | 212 mm | 83% | 1.7 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 32.6°C with lows near 22.4°C (mean 27.5°C), based on 45 years of NASA POWER data.
September averages 118 mm of rainfall in Salem, a relatively wet time of year. The wettest on record was 250 mm in 1983.
The hottest September reached 38.9°C in 1982. The coldest dipped to 18.2°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1°C. Daytime highs moved from 31.7°C to 32.8°C and overnight lows from 21.8°C to 22.6°C over the same span.
September is close to Salem's year-round average and a relatively wet time of year, so plan for around 32.6°C daytime highs and 22.4°C at night.
Not quite — September is the 6th coolest month in Salem, averaging 27.5°C.
For September in Salem, pack light, breathable clothing and sun protection, with typical highs of 32.6°C and lows of 22.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 72% — moderately humid.
Average wind speed in September is 2 m/s. The windiest September on record averaged 2.5 m/s (2016).
The wettest September on record was 1983 with 250 mm. On average, September sees 118 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 Salem 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.
