September is one of the warmer months of the year in Scarborough, with average highs near 15.6°C and lows around 11.2°C (mean 13.4°C). It is about average for rainfall, averaging 68 mm of rainfall and 85% relative humidity across the period.
September is one of the warmer months of the year in Scarborough. Across 45 years of records, the warmest September in Scarborough was 2006 — when the month averaged 15.6°C — while the coldest was 1986 at 11.2°C. Typical September days reach 15.6°C with nights near 11.2°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Scarborough, averaging 68 mm of rainfall. The wettest September on record was 2024 with 135 mm, while the driest was 1989 at 17 mm.
Relative humidity in Scarborough during September averages 85%. The most humid September was 1998 at 90%, and the least humid was 1990 at 82%.
September receives about 2.7 kWh/m²/day of solar energy in Scarborough. The sunniest Septembers were 2003 and 2004 at 3.1 kWh/m²/day, and the cloudiest was 2000 at 2.
Average wind speed in Scarborough during September is 4.6 m/s. The windiest Septembers were 1983 and 2001 at 5.7 m/s, while the calmest was 2014 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.8°C | 13.0°C | 13.9°C | 13.4°C | 14.2°C | +1.4°C |
| Avg High | 15.1°C | 15.1°C | 16.0°C | 15.7°C | 16.4°C | +1.3°C |
| Avg Low | 10.5°C | 11.0°C | 11.7°C | 11.1°C | 12.0°C | +1.5°C |
| Avg Rain | 62 mm | 70 mm | 63 mm | 67 mm | 85 mm | +23 mm |
September temperatures in Scarborough have risen by about 1.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 5.5°C (1988) to a record high of 24.7°C (2023).
Rainfall in September is about average for rainfall, averaging 68 mm, with a wettest year of 135 mm.
One of the best times to visit Scarborough
September is one of the best times to visit Scarborough. Expect days averaging 15.6°C and nights around 11.2°C (mean 13.4°C) — warmer than Scarborough's yearly average — with moderate rainfall (68 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 | 16.2°C | 13.8°C | 11.5°C | 18.9°C | 8.2°C | 107 mm | 84% | 4.7 m/s | 3 |
| 2024 🌧️ | 15.0°C | 13.2°C | 11.3°C | 19.7°C | 7.2°C | 135 mm | 87% | 4.6 m/s | 2.5 |
| 2023 | 17.9°C | 15.5°C | 13.2°C | 24.7°C | 9.9°C | 82 mm | 87% | 4 m/s | 2.8 |
| 2022 | 16.1°C | 14.2°C | 12.3°C | 20.9°C | 7.7°C | 80 mm | 85% | 4.5 m/s | 2.8 |
| 2021 | 17.4°C | 15.1°C | 12.8°C | 22.3°C | 9.2°C | 59 mm | 87% | 3.9 m/s | 2.8 |
| 2020 | 15.7°C | 13.2°C | 10.7°C | 21.3°C | 8.2°C | 49 mm | 84% | 4.8 m/s | 2.9 |
| 2019 | 15.6°C | 13.4°C | 11.1°C | 18.3°C | 8.5°C | 104 mm | 85% | 4.6 m/s | 3 |
| 2018 | 15.7°C | 13.1°C | 10.4°C | 19.6°C | 6.8°C | 56 mm | 84% | 5.2 m/s | 2.9 |
| 2017 | 15.3°C | 13.2°C | 11.1°C | 18.1°C | 8.4°C | 88 mm | 88% | 4.8 m/s | 2.7 |
| 2016 | 17.1°C | 14.8°C | 12.5°C | 21.0°C | 9.3°C | 51 mm | 88% | 4.6 m/s | 2.8 |
| 2015 | 14.7°C | 12.5°C | 10.3°C | 16.2°C | 9.0°C | 61 mm | 86% | 4.1 m/s | 2.9 |
| 2014 | 16.2°C | 14.0°C | 11.7°C | 17.5°C | 8.8°C | 27 mm | 88% | 2.9 m/s | 2.6 |
| 2013 | 15.2°C | 13.1°C | 10.9°C | 19.8°C | 8.2°C | 44 mm | 85% | 4.6 m/s | 2.6 |
| 2012 | 14.9°C | 12.5°C | 10.2°C | 19.3°C | 7.4°C | 95 mm | 85% | 5.2 m/s | 2.9 |
| 2011 | 16.4°C | 13.9°C | 11.4°C | 20.3°C | 9.0°C | 40 mm | 84% | 5.3 m/s | 2.8 |
| 2010 | 15.5°C | 13.5°C | 11.4°C | 19.0°C | 8.5°C | 99 mm | 85% | 5.1 m/s | 2.8 |
| 2009 | 15.7°C | 13.6°C | 11.4°C | 20.1°C | 9.7°C | 37 mm | 85% | 4.6 m/s | 2.8 |
| 2008 | 15.4°C | 13.5°C | 11.5°C | 17.2°C | 9.3°C | 105 mm | 87% | 4.1 m/s | 2.5 |
| 2007 | 15.6°C | 13.4°C | 11.2°C | 18.6°C | 7.9°C | 42 mm | 85% | 5.2 m/s | 2.9 |
| 2006 🔥 | 18.0°C | 15.6°C | 13.2°C | 20.3°C | 10.6°C | 63 mm | 88% | 4.3 m/s | 3 |
| 2005 | 16.7°C | 14.4°C | 12.1°C | 20.9°C | 8.4°C | 61 mm | 86% | 4.8 m/s | 2.9 |
| 2004 | 16.0°C | 13.6°C | 11.3°C | 20.7°C | 8.6°C | 31 mm | 85% | 5.5 m/s | 3.1 |
| 2003 | 16.6°C | 14.0°C | 11.4°C | 20.4°C | 7.5°C | 65 mm | 83% | 3.7 m/s | 3.1 |
| 2002 | 15.8°C | 13.9°C | 11.9°C | 18.1°C | 9.8°C | 28 mm | 85% | 3.6 m/s | 2.8 |
| 2001 | 14.8°C | 13.0°C | 11.1°C | 18.7°C | 9.2°C | 92 mm | 87% | 5.7 m/s | 2.3 |
| 2000 | 15.6°C | 13.5°C | 11.4°C | 18.6°C | 9.1°C | 103 mm | 88% | 4.5 m/s | 2 |
| 1999 | 17.2°C | 14.8°C | 12.4°C | 21.4°C | 9.6°C | 78 mm | 87% | 4.1 m/s | 3 |
| 1998 | 15.3°C | 13.5°C | 11.8°C | 18.4°C | 8.6°C | 76 mm | 90% | 4.5 m/s | 2.4 |
| 1997 | 15.3°C | 13.1°C | 10.9°C | 18.1°C | 8.4°C | 21 mm | 84% | 4.3 m/s | 3 |
| 1996 | 14.6°C | 13.0°C | 11.3°C | 17.4°C | 9.2°C | 37 mm | 84% | 4.9 m/s | 2.6 |
| 1995 | 15.2°C | 13.2°C | 11.1°C | 17.8°C | 5.9°C | 120 mm | 86% | 4.5 m/s | 2.7 |
| 1994 | 14.0°C | 12.1°C | 10.3°C | 17.4°C | 6.9°C | 100 mm | 86% | 5.2 m/s | 2.7 |
| 1993 | 13.7°C | 12.1°C | 10.4°C | 18.7°C | 7.6°C | 88 mm | 86% | 5.1 m/s | 2.4 |
| 1992 | 14.7°C | 12.4°C | 10.0°C | 17.1°C | 7.9°C | 83 mm | 86% | 4.9 m/s | 2.6 |
| 1991 | 16.0°C | 13.5°C | 11.0°C | 19.5°C | 7.9°C | 37 mm | 82% | 4.5 m/s | 3 |
| 1990 | 14.5°C | 12.4°C | 10.3°C | 18.9°C | 7.0°C | 56 mm | 82% | 4.8 m/s | 2.7 |
| 1989 | 15.8°C | 13.6°C | 11.4°C | 19.1°C | 9.3°C | 17 mm | 83% | 4.5 m/s | 2.7 |
| 1988 | 14.7°C | 12.5°C | 10.2°C | 18.9°C | 5.5°C | 48 mm | 85% | 5.4 m/s | 2.5 |
| 1987 | 14.8°C | 12.6°C | 10.3°C | 18.2°C | 7.1°C | 65 mm | 85% | 4.7 m/s | 2.7 |
| 1986 ❄️ | 13.5°C | 11.2°C | 8.8°C | 17.7°C | 6.4°C | 21 mm | 82% | 4.2 m/s | 3 |
| 1985 | 15.3°C | 13.0°C | 10.6°C | 19.3°C | 7.4°C | 57 mm | 87% | 4.2 m/s | 2.7 |
| 1984 | 14.7°C | 12.8°C | 11.0°C | 20.6°C | 8.6°C | 122 mm | 83% | 4.9 m/s | 2.5 |
| 1983 | 14.7°C | 12.5°C | 10.3°C | 18.4°C | 7.7°C | 82 mm | 85% | 5.7 m/s | — |
| 1982 | 15.9°C | 13.3°C | 10.6°C | 20.4°C | 7.0°C | 56 mm | 85% | 4.8 m/s | — |
| 1981 | 16.3°C | 13.9°C | 11.4°C | 19.4°C | 9.6°C | 89 mm | 84% | 4.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 15.6°C with lows near 11.2°C (mean 13.4°C), based on 45 years of NASA POWER data.
September averages 68 mm of rainfall in Scarborough, about average for rainfall. The wettest on record was 135 mm in 2024.
The hottest September reached 24.7°C in 2023. The coldest dipped to 5.5°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.3°C. Daytime highs moved from 15.4°C to 16.5°C and overnight lows from 10.8°C to 12.2°C over the same span.
September is one of the warmer months of the year in Scarborough and about average for rainfall, so plan for around 15.6°C daytime highs and 11.2°C at night.
Not quite — September is the 10th coolest month in Scarborough, averaging 13.4°C.
For September in Scarborough, pack light layers you can adjust through the day, with typical highs of 15.6°C and lows of 11.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 85% — quite humid.
Average wind speed in September is 4.6 m/s. The windiest September on record averaged 5.7 m/s (1983).
The wettest September on record was 2024 with 135 mm. On average, September sees 68 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 Scarborough 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.
