September is one of the warmer months of the year in Coaldale, with average highs near 20.3°C and lows around 7.2°C (mean 13.8°C). It is about average for rainfall, averaging 39 mm of rainfall and 57% relative humidity across the period.
September is one of the warmer months of the year in Coaldale. Across 45 years of records, the warmest September in Coaldale was 2025 — when the month averaged 18.4°C — while the coldest was 1985 at 7.8°C. Typical September days reach 20.3°C with nights near 7.2°C. The long-term trend is warming, about 0.8°C per decade.
September is about average for rainfall in Coaldale, averaging 39 mm of rainfall. The wettest September on record was 1985 with 110 mm, while the driest was 1990 at 4 mm.
Relative humidity in Coaldale during September averages 57%. The most humid September was 1986 at 72%, and the least humid was 2001 at 45%.
September receives about 4.1 kWh/m²/day of solar energy in Coaldale. The sunniest September was 1990 at 5 kWh/m²/day, and the cloudiest was 1986 at 3.1.
Average wind speed in Coaldale during September is 2.9 m/s. The windiest September was 1992 at 3.5 m/s, while the calmest were 2008 and 2018 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.8°C | 13.9°C | 13.8°C | 13.7°C | 16.5°C | +4.7°C |
| Avg High | 18.1°C | 20.8°C | 20.4°C | 20.0°C | 23.2°C | +5.1°C |
| Avg Low | 5.6°C | 7.1°C | 7.2°C | 7.3°C | 9.9°C | +4.3°C |
| Avg Rain | 54 mm | 32 mm | 43 mm | 36 mm | 28 mm | -26 mm |
September temperatures in Coaldale have risen by about 5.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -10.5°C (2019) to a record high of 34.6°C (1998).
Rainfall in September is about average for rainfall, averaging 39 mm, with a wettest year of 110 mm.
One of the best times to visit Coaldale
September is one of the best times to visit Coaldale. Expect days averaging 20.3°C and nights around 7.2°C (mean 13.8°C) — warmer than Coaldale's yearly average — with moderate rainfall (39 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 🔥 | 25.3°C | 18.4°C | 11.5°C | 31.1°C | 6.0°C | 17 mm | 54% | 2.4 m/s | 4.2 |
| 2024 | 23.1°C | 16.8°C | 10.4°C | 32.3°C | 3.6°C | 46 mm | 58% | 2.8 m/s | 4.2 |
| 2023 | 21.9°C | 15.8°C | 9.8°C | 30.1°C | 4.6°C | 23 mm | 55% | 2.8 m/s | 3.9 |
| 2022 | 24.1°C | 17.3°C | 10.4°C | 34.0°C | 2.0°C | 28 mm | 51% | 2.6 m/s | 4.2 |
| 2021 | 23.0°C | 16.0°C | 9.0°C | 30.5°C | 3.7°C | 14 mm | 48% | 3.2 m/s | 4.4 |
| 2020 | 21.6°C | 14.9°C | 8.3°C | 32.9°C | 1.1°C | 38 mm | 58% | 3 m/s | 3.7 |
| 2019 | 18.6°C | 13.0°C | 7.5°C | 28.4°C | -10.5°C | 66 mm | 64% | 3.1 m/s | 3.6 |
| 2018 | 16.6°C | 10.8°C | 5.0°C | 29.1°C | -2.6°C | 25 mm | 62% | 2.2 m/s | 3.4 |
| 2017 | 20.6°C | 14.1°C | 7.6°C | 32.9°C | 0.3°C | 12 mm | 52% | 2.5 m/s | 3.8 |
| 2016 | 19.0°C | 13.2°C | 7.3°C | 27.5°C | 0.7°C | 35 mm | 60% | 3.2 m/s | 4 |
| 2015 | 19.6°C | 13.1°C | 6.7°C | 29.5°C | 1.5°C | 48 mm | 59% | 2.8 m/s | 4.1 |
| 2014 | 19.3°C | 13.0°C | 6.7°C | 28.7°C | -3.7°C | 46 mm | 64% | 2.8 m/s | 4 |
| 2013 | 21.5°C | 15.5°C | 9.4°C | 31.4°C | 1.6°C | 56 mm | 60% | 3.1 m/s | 4 |
| 2012 | 23.5°C | 16.0°C | 8.4°C | 29.0°C | 3.0°C | 10 mm | 49% | 2.7 m/s | 4.5 |
| 2011 | 23.7°C | 16.3°C | 9.0°C | 31.1°C | 2.5°C | 15 mm | 48% | 3.1 m/s | 4.6 |
| 2010 | 17.3°C | 11.5°C | 5.6°C | 26.1°C | 0.2°C | 44 mm | 70% | 2.9 m/s | 3.4 |
| 2009 | 25.0°C | 17.2°C | 9.4°C | 33.9°C | 2.4°C | 14 mm | 45% | 3.2 m/s | 4.6 |
| 2008 | 19.7°C | 13.0°C | 6.3°C | 29.2°C | 2.4°C | 54 mm | 60% | 2.2 m/s | 4.3 |
| 2007 | 19.3°C | 12.9°C | 6.4°C | 29.8°C | 0.6°C | 55 mm | 56% | 3 m/s | 3.9 |
| 2006 | 21.0°C | 14.1°C | 7.3°C | 30.6°C | -0.7°C | 29 mm | 56% | 2.7 m/s | 4 |
| 2005 | 18.0°C | 11.9°C | 5.9°C | 27.7°C | -1.2°C | 101 mm | 66% | 2.8 m/s | 4.1 |
| 2004 | 19.0°C | 13.0°C | 7.0°C | 29.3°C | -0.8°C | 35 mm | 64% | 3 m/s | 3.9 |
| 2003 | 20.2°C | 13.7°C | 7.3°C | 33.7°C | -0.4°C | 36 mm | 54% | 2.9 m/s | 3.8 |
| 2002 | 18.7°C | 12.9°C | 7.0°C | 28.2°C | 0.2°C | 54 mm | 61% | 2.9 m/s | 3.8 |
| 2001 | 23.5°C | 16.0°C | 8.6°C | 32.3°C | 4.3°C | 9 mm | 45% | 2.7 m/s | 4.4 |
| 2000 | 19.5°C | 13.0°C | 6.5°C | 29.5°C | -5.4°C | 44 mm | 56% | 3.2 m/s | 3.9 |
| 1999 | 19.5°C | 12.9°C | 6.3°C | 28.6°C | -2.3°C | 21 mm | 51% | 2.7 m/s | 4.4 |
| 1998 | 23.6°C | 16.4°C | 9.3°C | 34.6°C | 3.3°C | 19 mm | 50% | 2.5 m/s | 4.4 |
| 1997 | 22.5°C | 15.6°C | 8.7°C | 30.7°C | 0.3°C | 15 mm | 52% | 3.3 m/s | 4.6 |
| 1996 | 17.1°C | 11.5°C | 5.8°C | 28.9°C | -1.9°C | 74 mm | 64% | 2.9 m/s | 3.3 |
| 1995 | 19.7°C | 13.0°C | 6.3°C | 29.6°C | -3.2°C | 51 mm | 59% | 2.5 m/s | 4.2 |
| 1994 | 24.1°C | 16.3°C | 8.6°C | 29.9°C | 2.0°C | 8 mm | 45% | 2.7 m/s | 4.4 |
| 1993 | 17.1°C | 10.8°C | 4.6°C | 27.0°C | -1.4°C | 72 mm | 68% | 2.7 m/s | 4.4 |
| 1992 | 18.4°C | 12.0°C | 5.5°C | 29.2°C | -0.4°C | 29 mm | 56% | 3.5 m/s | 4 |
| 1991 | 21.0°C | 13.8°C | 6.6°C | 29.2°C | -0.7°C | 26 mm | 55% | 2.6 m/s | 4.2 |
| 1990 | 25.0°C | 16.9°C | 8.9°C | 31.8°C | 2.6°C | 4 mm | 45% | 2.7 m/s | 5 |
| 1989 | 19.4°C | 12.7°C | 6.0°C | 26.1°C | -1.2°C | 45 mm | 60% | 2.8 m/s | 4.6 |
| 1988 | 20.6°C | 13.8°C | 7.1°C | 32.3°C | -0.1°C | 40 mm | 51% | 3.1 m/s | 3.9 |
| 1987 | 22.5°C | 15.3°C | 8.2°C | 30.8°C | 3.6°C | 23 mm | 52% | 2.4 m/s | 4.3 |
| 1986 | 14.2°C | 8.9°C | 3.7°C | 25.9°C | -0.7°C | 94 mm | 72% | 2.9 m/s | 3.1 |
| 1985 ❄️ 🌧️ | 13.3°C | 7.8°C | 2.4°C | 22.5°C | -6.4°C | 110 mm | 70% | 3.3 m/s | 3.3 |
| 1984 | 15.5°C | 9.7°C | 3.8°C | 29.7°C | -4.2°C | 70 mm | 62% | 2.8 m/s | 3.8 |
| 1983 | 17.6°C | 11.4°C | 5.2°C | 30.7°C | -3.8°C | 26 mm | 56% | 3.2 m/s | — |
| 1982 | 18.8°C | 12.6°C | 6.4°C | 29.3°C | -2.8°C | 65 mm | 59% | 3.1 m/s | — |
| 1981 | 21.0°C | 14.4°C | 7.7°C | 32.7°C | -0.3°C | 10 mm | 51% | 2.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 20.3°C with lows near 7.2°C (mean 13.8°C), based on 45 years of NASA POWER data.
September averages 39 mm of rainfall in Coaldale, about average for rainfall. The wettest on record was 110 mm in 1985.
The hottest September reached 34.6°C in 1998. The coldest dipped to -10.5°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 5.7°C. Daytime highs moved from 17.2°C to 23.5°C and overnight lows from 5.1°C to 10.2°C over the same span.
September is one of the warmer months of the year in Coaldale and about average for rainfall, so plan for around 20.3°C daytime highs and 7.2°C at night.
Not quite — September is the 9th coolest month in Coaldale, averaging 13.8°C.
For September in Coaldale, pack warm layers and a jacket for chilly mornings, with typical highs of 20.3°C and lows of 7.2°C.
Relative humidity in September averages 57% — moderately humid.
Average wind speed in September is 2.9 m/s. The windiest September on record averaged 3.5 m/s (1992).
The wettest September on record was 1985 with 110 mm. On average, September sees 39 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 Coaldale 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.
