September is one of the warmer months of the year in White Rock, with average highs near 19.8°C and lows around 10.6°C (mean 15.2°C). It is one of the drier months, averaging 70 mm of rainfall and 79% relative humidity across the period.
September is one of the warmer months of the year in White Rock. Across 45 years of records, the warmest September in White Rock was 1990 — when the month averaged 17.4°C — while the coldest was 1983 at 12.8°C. Typical September days reach 19.8°C with nights near 10.6°C. The long-term September temperature trend is broadly flat.
September is one of the drier months in White Rock, averaging 70 mm of rainfall. The wettest September on record was 2021 with 177 mm, while the driest was 1991 at 8 mm.
Relative humidity in White Rock during September averages 79%. The most humid September was 2025 at 89%, and the least humid was 1989 at 71%.
September receives about 3.7 kWh/m²/day of solar energy in White Rock. The sunniest September was 1993 at 4.6 kWh/m²/day, and the cloudiest was 2019 at 3.
Average wind speed in White Rock during September is 0.5 m/s. The windiest Septembers were 2021, 2023 and 2025, among others at 0.6 m/s, while the calmest was 1998 at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.5°C | 15.8°C | 14.8°C | 15.3°C | 15.6°C | +1.1°C |
| Avg High | 19.4°C | 20.7°C | 19.3°C | 19.7°C | 19.7°C | +0.3°C |
| Avg Low | 9.7°C | 10.9°C | 10.3°C | 11.0°C | 11.5°C | +1.8°C |
| Avg Rain | 64 mm | 49 mm | 62 mm | 90 mm | 91 mm | +27 mm |
September temperatures in White Rock have risen by about 1.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 2.7°C (1983) to a record high of 35.3°C (2013).
Rainfall in September is one of the drier months, averaging 70 mm, with a wettest year of 177 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
One of the best times to visit White Rock
September is one of the best times to visit White Rock. Expect days averaging 19.8°C and nights around 10.6°C (mean 15.2°C) — warmer than White Rock's yearly average — with moderate rainfall (70 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 | 19.1°C | 15.5°C | 11.8°C | 28.8°C | 8.0°C | 111 mm | 89% | 0.6 m/s | 3.7 |
| 2024 | 18.4°C | 14.8°C | 11.3°C | 34.2°C | 4.2°C | 79 mm | 86% | 0.5 m/s | 3.5 |
| 2023 | 19.2°C | 15.1°C | 10.9°C | 25.2°C | 6.2°C | 68 mm | 81% | 0.6 m/s | 3.6 |
| 2022 | 21.9°C | 17.0°C | 12.0°C | 32.3°C | 9.6°C | 10 mm | 77% | 0.5 m/s | 4.2 |
| 2021 🌧️ | 18.4°C | 14.5°C | 10.7°C | 24.0°C | 6.4°C | 177 mm | 84% | 0.6 m/s | 3.1 |
| 2020 | 21.3°C | 16.9°C | 12.4°C | 28.3°C | 9.1°C | 99 mm | 82% | 0.5 m/s | 3.5 |
| 2019 | 18.4°C | 14.8°C | 11.3°C | 28.3°C | 2.8°C | 132 mm | 84% | 0.6 m/s | 3 |
| 2018 | 18.3°C | 14.3°C | 10.3°C | 25.6°C | 7.3°C | 102 mm | 82% | 0.5 m/s | 3.2 |
| 2017 | 20.7°C | 16.3°C | 12.0°C | 32.5°C | 6.5°C | 45 mm | 76% | 0.5 m/s | 3.6 |
| 2016 | 18.2°C | 14.2°C | 10.1°C | 24.1°C | 6.5°C | 69 mm | 82% | 0.6 m/s | 3.6 |
| 2015 | 18.2°C | 13.9°C | 9.7°C | 26.6°C | 6.1°C | 89 mm | 80% | 0.5 m/s | 3.4 |
| 2014 | 21.8°C | 16.8°C | 11.9°C | 31.1°C | 7.2°C | 77 mm | 76% | 0.6 m/s | 3.8 |
| 2013 | 20.3°C | 16.2°C | 12.0°C | 35.3°C | 5.0°C | 148 mm | 84% | 0.6 m/s | 3.3 |
| 2012 | 21.1°C | 16.0°C | 10.9°C | 31.8°C | 6.0°C | 9 mm | 76% | 0.5 m/s | 4.3 |
| 2011 | 20.9°C | 16.3°C | 11.7°C | 30.0°C | 7.3°C | 67 mm | 77% | 0.6 m/s | 3.6 |
| 2010 | 18.6°C | 14.5°C | 10.3°C | 25.7°C | 5.9°C | 161 mm | 86% | 0.5 m/s | 3.2 |
| 2009 | 20.6°C | 15.8°C | 10.9°C | 32.2°C | 5.7°C | 71 mm | 76% | 0.6 m/s | 3.7 |
| 2008 | 20.0°C | 15.0°C | 10.0°C | 30.3°C | 5.2°C | 26 mm | 77% | 0.5 m/s | 3.9 |
| 2007 | 18.0°C | 13.8°C | 9.7°C | 26.2°C | 5.1°C | 64 mm | 82% | 0.6 m/s | 3.5 |
| 2006 | 20.3°C | 15.8°C | 11.2°C | 31.7°C | 7.1°C | 47 mm | 75% | 0.5 m/s | 4.2 |
| 2005 | 17.7°C | 13.5°C | 9.3°C | 24.7°C | 6.4°C | 80 mm | 81% | 0.5 m/s | 3.6 |
| 2004 | 17.6°C | 13.8°C | 9.9°C | 21.4°C | 6.8°C | 98 mm | 84% | 0.5 m/s | 3.1 |
| 2003 | 20.5°C | 15.7°C | 11.0°C | 29.9°C | 7.1°C | 46 mm | 77% | 0.5 m/s | 4 |
| 2002 | 19.2°C | 14.5°C | 9.9°C | 25.5°C | 5.8°C | 55 mm | 77% | 0.5 m/s | 3.8 |
| 2001 | 19.6°C | 15.0°C | 10.5°C | 30.0°C | 6.7°C | 46 mm | 80% | 0.5 m/s | 3.8 |
| 2000 | 19.1°C | 14.8°C | 10.5°C | 29.6°C | 5.5°C | 87 mm | 80% | 0.6 m/s | 3.6 |
| 1999 | 20.3°C | 15.0°C | 9.7°C | 32.4°C | 4.4°C | 27 mm | 74% | 0.6 m/s | 4.2 |
| 1998 | 20.9°C | 16.4°C | 11.8°C | 27.9°C | 8.2°C | 16 mm | 77% | 0.4 m/s | 4.2 |
| 1997 | 21.4°C | 16.6°C | 11.8°C | 31.9°C | 6.5°C | 125 mm | 80% | 0.6 m/s | 3.6 |
| 1996 | 17.8°C | 13.6°C | 9.4°C | 24.2°C | 4.9°C | 90 mm | 81% | 0.5 m/s | 3.2 |
| 1995 | 22.1°C | 17.0°C | 11.9°C | 27.7°C | 7.5°C | 39 mm | 73% | 0.5 m/s | 4.2 |
| 1994 | 20.9°C | 16.4°C | 11.8°C | 27.9°C | 7.4°C | 60 mm | 76% | 0.5 m/s | 3.7 |
| 1993 | 21.1°C | 16.0°C | 10.9°C | 29.0°C | 3.6°C | 10 mm | 72% | 0.5 m/s | 4.6 |
| 1992 | 17.8°C | 13.2°C | 8.7°C | 26.7°C | 4.0°C | 88 mm | 79% | 0.6 m/s | 3.5 |
| 1991 | 21.8°C | 16.3°C | 10.9°C | 30.4°C | 7.3°C | 8 mm | 77% | 0.5 m/s | 4.3 |
| 1990 🔥 | 22.8°C | 17.4°C | 11.9°C | 29.6°C | 8.6°C | 27 mm | 72% | 0.5 m/s | 4.1 |
| 1989 | 22.3°C | 16.5°C | 10.7°C | 30.2°C | 6.2°C | 11 mm | 71% | 0.5 m/s | 4.4 |
| 1988 | 19.7°C | 14.8°C | 9.8°C | 34.0°C | 5.6°C | 88 mm | 76% | 0.6 m/s | 3.6 |
| 1987 | 20.9°C | 16.2°C | 11.4°C | 27.0°C | 7.4°C | 25 mm | 72% | 0.5 m/s | 3.9 |
| 1986 | 17.8°C | 13.2°C | 8.7°C | 25.7°C | 4.6°C | 74 mm | 80% | 0.5 m/s | 3.6 |
| 1985 | 17.8°C | 13.2°C | 8.7°C | 22.8°C | 4.7°C | 63 mm | 75% | 0.5 m/s | 3.6 |
| 1984 | 18.4°C | 13.6°C | 8.7°C | 24.7°C | 4.6°C | 83 mm | 79% | 0.6 m/s | 3.4 |
| 1983 ❄️ | 17.3°C | 12.8°C | 8.3°C | 23.7°C | 2.7°C | 91 mm | 80% | 0.6 m/s | — |
| 1982 | 20.2°C | 15.4°C | 10.5°C | 27.6°C | 5.1°C | 53 mm | 78% | 0.5 m/s | — |
| 1981 | 20.1°C | 15.2°C | 10.3°C | 33.1°C | 6.0°C | 88 mm | 78% | 0.6 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 19.8°C with lows near 10.6°C (mean 15.2°C), based on 45 years of NASA POWER data.
September averages 70 mm of rainfall in White Rock, one of the drier months. The wettest on record was 177 mm in 2021.
The hottest September reached 35.3°C in 2013. The coldest dipped to 2.7°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.4°C. Daytime highs moved from 18.8°C to 19.4°C and overnight lows from 9.3°C to 11.3°C over the same span.
September is one of the warmer months of the year in White Rock and one of the drier months, so plan for around 19.8°C daytime highs and 10.6°C at night.
Not quite — September is the 10th coolest month in White Rock, averaging 15.2°C.
For September in White Rock, pack light layers you can adjust through the day, with typical highs of 19.8°C and lows of 10.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 79% — quite humid.
Average wind speed in September is 0.5 m/s. The windiest September on record averaged 0.6 m/s (1981).
The wettest September on record was 2021 with 177 mm. On average, September sees 70 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 White Rock 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.
