September is one of the warmer months of the year in Whitehaven, with average highs near 15.4°C and lows around 11.9°C (mean 13.7°C). It is about average for rainfall, averaging 101 mm of rainfall and 85% relative humidity across the period.
September is one of the warmer months of the year in Whitehaven. Across 45 years of records, the warmest September in Whitehaven was 2023 — when the month averaged 15.6°C — while the coldest was 1986 at 11.6°C. Typical September days reach 15.4°C with nights near 11.9°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Whitehaven, averaging 101 mm of rainfall. The wettest September on record was 2025 with 183 mm, while the driest was 2014 at 17 mm.
Relative humidity in Whitehaven during September averages 85%. The most humid September was 1985 at 89%, and the least humid was 1991 at 79%.
September receives about 2.8 kWh/m²/day of solar energy in Whitehaven. 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 Whitehaven during September is 5.2 m/s. The windiest Septembers were 1983 and 2004 at 6.4 m/s, while the calmest was 2014 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.0°C | 13.4°C | 13.9°C | 13.6°C | 14.4°C | +1.4°C |
| Avg High | 14.6°C | 15.2°C | 15.7°C | 15.3°C | 16.3°C | +1.7°C |
| Avg Low | 11.4°C | 11.6°C | 12.2°C | 11.9°C | 12.6°C | +1.2°C |
| Avg Rain | 106 mm | 88 mm | 94 mm | 110 mm | 115 mm | +9 mm |
September temperatures in Whitehaven have risen by about 1.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 6.6°C (2007) to a record high of 22.3°C (1991).
Rainfall in September is about average for rainfall, averaging 101 mm, with a wettest year of 183 mm.
One of the best times to visit Whitehaven
September is one of the best times to visit Whitehaven. Expect days averaging 15.4°C and nights around 11.9°C (mean 13.7°C) — warmer than Whitehaven's yearly average — with higher rainfall (101 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 🌧️ | 15.6°C | 14.0°C | 12.3°C | 18.0°C | 8.8°C | 183 mm | 83% | 5.4 m/s | 2.7 |
| 2024 | 15.6°C | 13.5°C | 11.4°C | 20.4°C | 8.2°C | 69 mm | 84% | 5 m/s | 2.8 |
| 2023 🔥 | 17.5°C | 15.6°C | 13.7°C | 22.1°C | 11.1°C | 154 mm | 87% | 5.1 m/s | 2.8 |
| 2022 | 16.6°C | 14.7°C | 12.7°C | 19.6°C | 8.9°C | 107 mm | 84% | 4.9 m/s | 2.8 |
| 2021 | 17.3°C | 15.4°C | 13.6°C | 22.3°C | 9.9°C | 89 mm | 86% | 4 m/s | 2.8 |
| 2020 | 15.3°C | 13.5°C | 11.7°C | 18.1°C | 6.8°C | 86 mm | 85% | 5.2 m/s | 2.8 |
| 2019 | 15.5°C | 13.9°C | 12.3°C | 18.7°C | 10.7°C | 157 mm | 85% | 5.2 m/s | 2.8 |
| 2018 | 14.7°C | 13.0°C | 11.4°C | 18.0°C | 7.6°C | 107 mm | 83% | 6.1 m/s | 2.7 |
| 2017 | 14.9°C | 13.4°C | 11.9°C | 17.2°C | 9.7°C | 158 mm | 86% | 5.2 m/s | 2.5 |
| 2016 | 16.5°C | 14.9°C | 13.4°C | 20.6°C | 10.4°C | 113 mm | 86% | 5.5 m/s | 2.7 |
| 2015 | 14.9°C | 12.8°C | 10.8°C | 17.7°C | 9.4°C | 55 mm | 84% | 4.3 m/s | 3.3 |
| 2014 | 16.7°C | 14.6°C | 12.6°C | 18.9°C | 10.4°C | 17 mm | 85% | 3.2 m/s | 3 |
| 2013 | 14.8°C | 13.1°C | 11.3°C | 18.0°C | 8.6°C | 92 mm | 87% | 5.1 m/s | 2.5 |
| 2012 | 14.1°C | 12.6°C | 11.0°C | 17.3°C | 7.5°C | 146 mm | 86% | 6 m/s | 2.7 |
| 2011 | 15.4°C | 13.9°C | 12.4°C | 19.3°C | 10.3°C | 121 mm | 86% | 6.3 m/s | 2.7 |
| 2010 | 15.6°C | 13.9°C | 12.1°C | 18.5°C | 6.7°C | 131 mm | 85% | 5.5 m/s | 2.8 |
| 2009 | 15.2°C | 13.6°C | 12.0°C | 17.3°C | 9.9°C | 70 mm | 86% | 5.2 m/s | 2.7 |
| 2008 | 15.0°C | 13.4°C | 11.8°C | 16.9°C | 9.1°C | 114 mm | 87% | 4.9 m/s | 2.4 |
| 2007 | 15.1°C | 13.3°C | 11.5°C | 17.7°C | 6.6°C | 68 mm | 86% | 5.3 m/s | 2.8 |
| 2006 | 17.2°C | 15.5°C | 13.8°C | 21.1°C | 12.0°C | 113 mm | 87% | 5.1 m/s | 2.9 |
| 2005 | 15.9°C | 14.2°C | 12.5°C | 20.8°C | 8.3°C | 88 mm | 85% | 5.7 m/s | 2.8 |
| 2004 | 15.5°C | 13.8°C | 12.1°C | 19.4°C | 8.8°C | 115 mm | 87% | 6.4 m/s | 2.9 |
| 2003 | 15.8°C | 14.1°C | 12.4°C | 18.5°C | 8.1°C | 83 mm | 84% | 4.1 m/s | 2.9 |
| 2002 | 15.9°C | 14.0°C | 12.2°C | 18.8°C | 9.7°C | 52 mm | 84% | 3.4 m/s | 3 |
| 2001 | 15.0°C | 13.1°C | 11.1°C | 17.3°C | 8.6°C | 79 mm | 86% | 5.5 m/s | 2.4 |
| 2000 | 16.0°C | 14.3°C | 12.5°C | 19.6°C | 10.2°C | 157 mm | 86% | 5 m/s | 2.4 |
| 1999 | 16.3°C | 14.6°C | 12.8°C | 19.9°C | 10.3°C | 129 mm | 86% | 5 m/s | 2.8 |
| 1998 | 15.8°C | 14.0°C | 12.2°C | 19.3°C | 8.9°C | 92 mm | 87% | 4.9 m/s | 2.9 |
| 1997 | 15.4°C | 13.6°C | 11.8°C | 17.1°C | 8.6°C | 85 mm | 84% | 5.4 m/s | 2.9 |
| 1996 | 15.8°C | 13.7°C | 11.6°C | 19.1°C | 8.2°C | 48 mm | 82% | 4.9 m/s | 2.8 |
| 1995 | 15.4°C | 13.6°C | 11.8°C | 18.2°C | 8.3°C | 89 mm | 83% | 4.5 m/s | 2.7 |
| 1994 | 13.8°C | 12.3°C | 10.8°C | 16.9°C | 8.3°C | 88 mm | 85% | 5 m/s | 2.8 |
| 1993 | 14.3°C | 12.4°C | 10.5°C | 18.2°C | 6.9°C | 93 mm | 84% | 5.4 m/s | 2.4 |
| 1992 | 14.3°C | 12.7°C | 11.2°C | 18.2°C | 9.0°C | 118 mm | 86% | 5.8 m/s | 2.9 |
| 1991 | 16.5°C | 14.2°C | 11.9°C | 22.3°C | 7.8°C | 62 mm | 79% | 4.9 m/s | 3.2 |
| 1990 | 14.6°C | 12.8°C | 11.1°C | 17.6°C | 7.7°C | 73 mm | 81% | 5.5 m/s | 2.5 |
| 1989 | 15.2°C | 13.4°C | 11.6°C | 17.6°C | 9.6°C | 42 mm | 84% | 5.1 m/s | 2.6 |
| 1988 | 14.0°C | 12.7°C | 11.3°C | 19.6°C | 6.7°C | 115 mm | 85% | 6 m/s | 2.4 |
| 1987 | 14.3°C | 12.9°C | 11.4°C | 17.6°C | 7.2°C | 116 mm | 84% | 5.6 m/s | 2.8 |
| 1986 ❄️ | 13.4°C | 11.6°C | 9.7°C | 15.3°C | 7.0°C | 18 mm | 81% | 4.3 m/s | 3.2 |
| 1985 | 14.9°C | 13.4°C | 11.9°C | 18.0°C | 8.4°C | 153 mm | 89% | 5.2 m/s | 2.6 |
| 1984 | 14.5°C | 13.0°C | 11.6°C | 17.6°C | 8.5°C | 134 mm | 83% | 5.2 m/s | 2.6 |
| 1983 | 14.4°C | 12.8°C | 11.2°C | 16.9°C | 7.8°C | 118 mm | 84% | 6.4 m/s | — |
| 1982 | 14.8°C | 13.1°C | 11.5°C | 18.8°C | 8.1°C | 103 mm | 85% | 5.4 m/s | — |
| 1981 | 15.5°C | 14.0°C | 12.4°C | 19.0°C | 10.5°C | 159 mm | 84% | 5.7 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 15.4°C with lows near 11.9°C (mean 13.7°C), based on 45 years of NASA POWER data.
September averages 101 mm of rainfall in Whitehaven, about average for rainfall. The wettest on record was 183 mm in 2025.
The hottest September reached 22.3°C in 1991. The coldest dipped to 6.6°C in 2007.
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 14.8°C to 16.5°C and overnight lows from 11.7°C to 12.7°C over the same span.
September is one of the warmer months of the year in Whitehaven and about average for rainfall, so plan for around 15.4°C daytime highs and 11.9°C at night.
Not quite — September is the 10th coolest month in Whitehaven, averaging 13.7°C.
For September in Whitehaven, pack light layers you can adjust through the day, with typical highs of 15.4°C and lows of 11.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 85% — quite humid.
Average wind speed in September is 5.2 m/s. The windiest September on record averaged 6.4 m/s (1983).
The wettest September on record was 2025 with 183 mm. On average, September sees 101 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 Whitehaven 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.
