September is one of the warmer months of the year in Carlisle, with average highs near 15.2°C and lows around 8.5°C (mean 11.9°C). It is about average for rainfall, averaging 90 mm of rainfall and 88% relative humidity across the period.
September is one of the warmer months of the year in Carlisle. Across 45 years of records, the warmest September in Carlisle was 2006 — when the month averaged 14.1°C — while the coldest was 1986 at 9.8°C. Typical September days reach 15.2°C with nights near 8.5°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Carlisle, averaging 90 mm of rainfall. The wettest September on record was 1985 with 158 mm, while the driest was 2014 at 18 mm.
Relative humidity in Carlisle during September averages 88%. The most humid September was 2008 at 91%, and the least humid was 1991 at 83%.
September receives about 2.8 kWh/m²/day of solar energy in Carlisle. The sunniest September was 2015 at 3.3 kWh/m²/day, and the cloudiest were 2000, 2001 and 2008, among others at 2.4.
Average wind speed in Carlisle during September is 3.5 m/s. The windiest Septembers were 1983 and 2004 at 4.4 m/s, while the calmest was 2014 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.3°C | 11.6°C | 12.2°C | 11.8°C | 12.6°C | +1.3°C |
| Avg High | 14.4°C | 15.0°C | 15.4°C | 15.1°C | 16.1°C | +1.7°C |
| Avg Low | 8.1°C | 8.2°C | 8.9°C | 8.5°C | 9.1°C | +1°C |
| Avg Rain | 100 mm | 77 mm | 88 mm | 95 mm | 95 mm | -5 mm |
September temperatures in Carlisle have risen by about 1.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 1°C (1986) to a record high of 23.9°C (2021).
Rainfall in September is about average for rainfall, averaging 90 mm, with a wettest year of 158 mm.
One of the best times to visit Carlisle
September is one of the best times to visit Carlisle. Expect days averaging 15.2°C and nights around 8.5°C (mean 11.9°C) — warmer than Carlisle's yearly average — with higher rainfall (90 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 | 15.2°C | 11.9°C | 8.7°C | 18.2°C | 2.6°C | 148 mm | 88% | 3.4 m/s | 2.7 |
| 2024 | 15.3°C | 11.6°C | 7.9°C | 21.0°C | 2.4°C | 54 mm | 88% | 3.3 m/s | 2.8 |
| 2023 | 17.2°C | 13.9°C | 10.5°C | 23.1°C | 6.0°C | 125 mm | 89% | 3.5 m/s | 2.8 |
| 2022 | 16.3°C | 12.5°C | 8.7°C | 20.6°C | 3.5°C | 89 mm | 88% | 3 m/s | 2.8 |
| 2021 | 17.4°C | 13.9°C | 10.4°C | 23.9°C | 6.0°C | 82 mm | 89% | 2.8 m/s | 2.8 |
| 2020 | 15.0°C | 11.6°C | 8.2°C | 19.9°C | 2.7°C | 68 mm | 89% | 3.6 m/s | 2.8 |
| 2019 | 15.2°C | 12.0°C | 8.7°C | 18.9°C | 5.6°C | 134 mm | 89% | 3.3 m/s | 2.8 |
| 2018 | 14.2°C | 11.0°C | 7.8°C | 18.7°C | 2.9°C | 100 mm | 88% | 4.2 m/s | 2.7 |
| 2017 | 14.5°C | 11.5°C | 8.6°C | 17.4°C | 5.1°C | 137 mm | 91% | 3.3 m/s | 2.5 |
| 2016 | 16.5°C | 13.5°C | 10.4°C | 21.3°C | 7.3°C | 101 mm | 90% | 3.8 m/s | 2.7 |
| 2015 | 15.0°C | 11.0°C | 7.0°C | 18.1°C | 4.4°C | 38 mm | 88% | 2.6 m/s | 3.3 |
| 2014 | 17.0°C | 13.0°C | 9.0°C | 19.8°C | 5.3°C | 18 mm | 87% | 2.1 m/s | 3 |
| 2013 | 14.5°C | 11.3°C | 8.1°C | 18.4°C | 4.9°C | 75 mm | 90% | 3.4 m/s | 2.5 |
| 2012 | 13.6°C | 10.5°C | 7.5°C | 18.7°C | 2.3°C | 110 mm | 90% | 4.2 m/s | 2.7 |
| 2011 | 15.3°C | 12.3°C | 9.4°C | 21.1°C | 5.5°C | 117 mm | 90% | 4.3 m/s | 2.7 |
| 2010 | 15.4°C | 12.1°C | 8.8°C | 19.1°C | 2.6°C | 118 mm | 88% | 3.6 m/s | 2.8 |
| 2009 | 15.0°C | 12.0°C | 9.0°C | 18.3°C | 5.7°C | 72 mm | 90% | 3.6 m/s | 2.7 |
| 2008 | 14.5°C | 11.6°C | 8.6°C | 16.9°C | 4.9°C | 108 mm | 91% | 3.2 m/s | 2.4 |
| 2007 | 14.7°C | 11.2°C | 7.7°C | 19.2°C | 2.2°C | 65 mm | 89% | 3.6 m/s | 2.8 |
| 2006 🔥 | 17.5°C | 14.1°C | 10.7°C | 22.2°C | 6.9°C | 122 mm | 89% | 3.3 m/s | 2.9 |
| 2005 | 15.8°C | 12.6°C | 9.4°C | 22.1°C | 4.6°C | 80 mm | 88% | 4 m/s | 2.8 |
| 2004 | 15.2°C | 12.1°C | 9.0°C | 20.5°C | 4.4°C | 96 mm | 90% | 4.4 m/s | 2.9 |
| 2003 | 15.7°C | 12.1°C | 8.6°C | 19.3°C | 3.9°C | 71 mm | 88% | 2.7 m/s | 2.9 |
| 2002 | 15.8°C | 12.3°C | 8.7°C | 19.3°C | 5.4°C | 39 mm | 88% | 2.2 m/s | 3 |
| 2001 | 14.6°C | 11.4°C | 8.1°C | 17.6°C | 5.6°C | 83 mm | 89% | 3.7 m/s | 2.4 |
| 2000 | 15.6°C | 12.3°C | 9.1°C | 21.0°C | 5.2°C | 141 mm | 90% | 3.2 m/s | 2.4 |
| 1999 | 16.6°C | 13.3°C | 10.0°C | 22.4°C | 6.1°C | 99 mm | 89% | 3.4 m/s | 2.8 |
| 1998 | 15.9°C | 12.7°C | 9.4°C | 20.7°C | 5.6°C | 91 mm | 90% | 3.2 m/s | 2.9 |
| 1997 | 14.9°C | 11.5°C | 8.1°C | 17.4°C | 4.7°C | 66 mm | 88% | 3.5 m/s | 2.9 |
| 1996 | 15.6°C | 12.0°C | 8.4°C | 21.7°C | 4.6°C | 45 mm | 84% | 3.5 m/s | 2.8 |
| 1995 | 15.3°C | 11.6°C | 7.8°C | 18.3°C | 2.6°C | 90 mm | 87% | 2.9 m/s | 2.7 |
| 1994 | 13.5°C | 10.4°C | 7.3°C | 17.5°C | 3.9°C | 68 mm | 88% | 3.3 m/s | 2.8 |
| 1993 | 13.9°C | 10.5°C | 7.0°C | 20.4°C | 2.0°C | 60 mm | 88% | 3.5 m/s | 2.4 |
| 1992 | 14.0°C | 11.0°C | 8.1°C | 20.3°C | 5.1°C | 121 mm | 90% | 3.9 m/s | 2.9 |
| 1991 | 16.3°C | 12.2°C | 8.2°C | 22.3°C | 3.0°C | 61 mm | 83% | 3.5 m/s | 3.2 |
| 1990 | 14.2°C | 10.9°C | 7.5°C | 18.5°C | 3.7°C | 65 mm | 85% | 3.6 m/s | 2.5 |
| 1989 | 15.1°C | 11.7°C | 8.3°C | 19.2°C | 5.4°C | 45 mm | 87% | 3.5 m/s | 2.6 |
| 1988 | 13.9°C | 11.1°C | 8.3°C | 21.2°C | 1.3°C | 100 mm | 89% | 4 m/s | 2.4 |
| 1987 | 14.0°C | 11.0°C | 8.1°C | 18.1°C | 2.1°C | 100 mm | 88% | 3.8 m/s | 2.8 |
| 1986 ❄️ | 13.6°C | 9.8°C | 6.1°C | 17.2°C | 1.0°C | 23 mm | 85% | 3 m/s | 3.2 |
| 1985 🌧️ | 14.8°C | 11.8°C | 8.8°C | 19.0°C | 4.2°C | 158 mm | 91% | 3.5 m/s | 2.6 |
| 1984 | 14.3°C | 11.3°C | 8.3°C | 19.2°C | 3.9°C | 122 mm | 85% | 3.3 m/s | 2.6 |
| 1983 | 13.9°C | 10.9°C | 7.8°C | 17.4°C | 3.3°C | 110 mm | 88% | 4.4 m/s | — |
| 1982 | 14.9°C | 11.6°C | 8.4°C | 20.9°C | 3.3°C | 99 mm | 88% | 4 m/s | — |
| 1981 | 15.3°C | 12.1°C | 8.8°C | 19.5°C | 5.2°C | 143 mm | 88% | 3.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 15.2°C with lows near 8.5°C (mean 11.9°C), based on 45 years of NASA POWER data.
September averages 90 mm of rainfall in Carlisle, about average for rainfall. The wettest on record was 158 mm in 1985.
The hottest September reached 23.9°C in 2021. The coldest dipped to 1°C in 1986.
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 14.6°C to 16.3°C and overnight lows from 8.4°C to 9.2°C over the same span.
September is one of the warmer months of the year in Carlisle and about average for rainfall, so plan for around 15.2°C daytime highs and 8.5°C at night.
Not quite — September is the 9th coolest month in Carlisle, averaging 11.9°C.
For September in Carlisle, pack light layers you can adjust through the day, with typical highs of 15.2°C and lows of 8.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 88% — quite humid.
Average wind speed in September is 3.5 m/s. The windiest September on record averaged 4.4 m/s (1983).
The wettest September on record was 1985 with 158 mm. On average, September sees 90 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 Carlisle 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.
