July is one of the cooler months of the year in Whanganui, with average highs near 12.1°C and lows around 7.7°C (mean 9.9°C). It is a relatively wet time of year, averaging 98 mm of rainfall and 86% relative humidity across the period.
July is one of the cooler months of the year in Whanganui. Across 45 years of records, the warmest July in Whanganui was 1998 — when the month averaged 11.7°C — while the coldest was 1983 at 8.7°C. Typical July days reach 12.1°C with nights near 7.7°C. The long-term trend is warming, about 0.2°C per decade.
July is a relatively wet time of year in Whanganui, averaging 98 mm of rainfall. The wettest July on record was 2022 with 221 mm, while the driest was 1987 at 30 mm.
Relative humidity in Whanganui during July averages 86%. The most humid July was 1996 at 89%, and the least humid was 2003 at 82%.
July receives about 1.8 kWh/m²/day of solar energy in Whanganui. The sunniest July was 2003 at 2.1 kWh/m²/day, and the cloudiest were 2005, 2007 and 2008, among others at 1.6.
Average wind speed in Whanganui during July is 4.7 m/s. The windiest July was 2016 at 6.2 m/s, while the calmest were 1989 and 1993 at 3.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.7°C | 9.7°C | 9.9°C | 10.1°C | 10.7°C | +1°C |
| Avg High | 11.9°C | 11.8°C | 12.1°C | 12.2°C | 12.9°C | +1°C |
| Avg Low | 7.4°C | 7.6°C | 7.6°C | 7.9°C | 8.5°C | +1.1°C |
| Avg Rain | 85 mm | 120 mm | 82 mm | 92 mm | 119 mm | +34 mm |
July temperatures in Whanganui have risen by about 0.9°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 2.2°C (1986) to a record high of 18.1°C (1999).
Rainfall in July is a relatively wet time of year, averaging 98 mm, with a wettest year of 221 mm.
A quieter season to visit Whanganui
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Whanganui. That said, July — with days averaging 12.1°C and nights around 7.7°C (mean 9.9°C) and higher rainfall (98 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 13.2°C | 10.7°C | 8.1°C | 16.5°C | 4.9°C | 151 mm | 86% | 3.8 m/s | 1.9 |
| 2024 | 12.5°C | 10.2°C | 7.9°C | 14.5°C | 4.5°C | 109 mm | 88% | 3.8 m/s | 1.9 |
| 2023 | 12.9°C | 11.0°C | 9.1°C | 14.6°C | 5.7°C | 85 mm | 86% | 5.2 m/s | 1.7 |
| 2022 🌧️ | 13.3°C | 11.2°C | 9.2°C | 17.0°C | 4.8°C | 221 mm | 86% | 5.2 m/s | 1.8 |
| 2021 | 12.9°C | 10.5°C | 8.1°C | 16.6°C | 4.5°C | 61 mm | 85% | 4.6 m/s | 2 |
| 2020 | 12.7°C | 10.5°C | 8.3°C | 16.8°C | 5.2°C | 88 mm | 85% | 4.5 m/s | 1.8 |
| 2019 | 13.6°C | 11.4°C | 9.1°C | 16.2°C | 5.6°C | 147 mm | 87% | 4.7 m/s | 1.7 |
| 2018 | 12.6°C | 10.7°C | 8.7°C | 14.8°C | 5.7°C | 132 mm | 86% | 5.1 m/s | 1.9 |
| 2017 | 11.8°C | 9.8°C | 7.8°C | 15.0°C | 4.7°C | 146 mm | 87% | 4.8 m/s | 1.7 |
| 2016 | 12.6°C | 10.4°C | 8.2°C | 16.7°C | 5.2°C | 92 mm | 83% | 6.2 m/s | 1.9 |
| 2015 | 11.4°C | 9.2°C | 7.0°C | 14.6°C | 3.0°C | 74 mm | 86% | 4.6 m/s | 1.9 |
| 2014 | 11.9°C | 9.6°C | 7.4°C | 15.5°C | 4.7°C | 41 mm | 84% | 4.7 m/s | 1.9 |
| 2013 | 12.6°C | 10.7°C | 8.8°C | 14.6°C | 5.6°C | 61 mm | 87% | 4.9 m/s | 1.9 |
| 2012 | 12.4°C | 9.8°C | 7.1°C | 15.3°C | 3.8°C | 100 mm | 86% | 4.2 m/s | 1.9 |
| 2011 | 11.8°C | 9.7°C | 7.6°C | 13.6°C | 4.3°C | 84 mm | 83% | 5.5 m/s | 1.8 |
| 2010 | 11.7°C | 9.3°C | 6.8°C | 14.7°C | 3.3°C | 47 mm | 86% | 3.9 m/s | 2 |
| 2009 | 11.3°C | 9.0°C | 6.8°C | 14.6°C | 3.3°C | 87 mm | 86% | 4.6 m/s | 1.8 |
| 2008 | 12.0°C | 10.1°C | 8.2°C | 15.8°C | 3.7°C | 142 mm | 86% | 5.5 m/s | 1.6 |
| 2007 | 12.2°C | 10.1°C | 8.0°C | 15.9°C | 4.1°C | 88 mm | 88% | 5.2 m/s | 1.6 |
| 2006 | 12.1°C | 9.9°C | 7.7°C | 14.6°C | 4.7°C | 136 mm | 87% | 4.9 m/s | 1.9 |
| 2005 | 12.8°C | 10.7°C | 8.5°C | 15.5°C | 4.5°C | 58 mm | 87% | 4.7 m/s | 1.6 |
| 2004 | 11.5°C | 9.2°C | 6.8°C | 13.7°C | 4.1°C | 81 mm | 85% | 4.3 m/s | 2 |
| 2003 | 12.0°C | 9.4°C | 6.8°C | 14.8°C | 4.5°C | 69 mm | 82% | 4.2 m/s | 2.1 |
| 2002 | 12.0°C | 10.3°C | 8.6°C | 14.9°C | 6.0°C | 78 mm | 87% | 5.1 m/s | 1.6 |
| 2001 | 11.4°C | 8.9°C | 6.3°C | 14.1°C | 3.1°C | 52 mm | 86% | 3.9 m/s | 2 |
| 2000 | 14.0°C | 11.2°C | 8.3°C | 16.1°C | 4.1°C | 30 mm | 84% | 4.9 m/s | 2 |
| 1999 | 12.6°C | 10.5°C | 8.3°C | 18.1°C | 4.5°C | 100 mm | 86% | 4.6 m/s | 1.7 |
| 1998 🔥 | 13.9°C | 11.7°C | 9.5°C | 17.6°C | 5.5°C | 129 mm | 86% | 5.1 m/s | 1.6 |
| 1997 | 11.4°C | 9.1°C | 6.7°C | 13.9°C | 3.9°C | 46 mm | 84% | 4.2 m/s | 1.9 |
| 1996 | 11.2°C | 9.2°C | 7.2°C | 13.6°C | 4.0°C | 165 mm | 89% | 4.1 m/s | 1.7 |
| 1995 | 11.0°C | 9.2°C | 7.4°C | 13.7°C | 3.9°C | 155 mm | 84% | 5.6 m/s | 1.7 |
| 1994 | 11.5°C | 9.4°C | 7.3°C | 15.2°C | 2.6°C | 126 mm | 85% | 4.9 m/s | 1.7 |
| 1993 | 11.8°C | 9.4°C | 7.0°C | 14.7°C | 3.5°C | 43 mm | 87% | 3.6 m/s | 1.9 |
| 1992 | 11.8°C | 9.9°C | 8.0°C | 13.9°C | 4.9°C | 191 mm | 88% | 5.6 m/s | 1.6 |
| 1991 | 11.1°C | 8.8°C | 6.4°C | 13.1°C | 3.7°C | 125 mm | 86% | 4.2 m/s | 1.9 |
| 1990 | 12.0°C | 9.9°C | 7.9°C | 14.5°C | 4.2°C | 116 mm | 87% | 4.5 m/s | 1.8 |
| 1989 | 11.6°C | 9.0°C | 6.4°C | 14.4°C | 2.7°C | 74 mm | 83% | 3.6 m/s | 2 |
| 1988 | 12.3°C | 10.4°C | 8.5°C | 14.9°C | 5.0°C | 140 mm | 86% | 5.4 m/s | 1.8 |
| 1987 | 11.8°C | 9.6°C | 7.4°C | 14.0°C | 5.0°C | 30 mm | 85% | 4.1 m/s | 1.8 |
| 1986 | 11.5°C | 9.1°C | 6.7°C | 13.3°C | 2.2°C | 95 mm | 83% | 4.6 m/s | 1.9 |
| 1985 | 12.6°C | 10.7°C | 8.8°C | 16.0°C | 4.5°C | 92 mm | 86% | 5.2 m/s | 1.8 |
| 1984 | 12.6°C | 10.3°C | 8.1°C | 15.6°C | 5.2°C | 123 mm | 88% | 4.4 m/s | 1.6 |
| 1983 ❄️ | 11.0°C | 8.7°C | 6.4°C | 15.0°C | 3.8°C | 32 mm | 87% | 4.1 m/s | — |
| 1982 | 11.5°C | 9.0°C | 6.4°C | 14.1°C | 3.5°C | 68 mm | 84% | 4.6 m/s | — |
| 1981 | 12.0°C | 10.1°C | 8.1°C | 15.4°C | 4.8°C | 111 mm | 87% | 5.3 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 12.1°C with lows near 7.7°C (mean 9.9°C), based on 45 years of NASA POWER data.
July averages 98 mm of rainfall in Whanganui, a relatively wet time of year. The wettest on record was 221 mm in 2022.
The hottest July reached 18.1°C in 1999. The coldest dipped to 2.2°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 0.9°C. Daytime highs moved from 11.9°C to 13°C and overnight lows from 7.6°C to 8.5°C over the same span.
July is one of the cooler months of the year in Whanganui and a relatively wet time of year, so plan for around 12.1°C daytime highs and 7.7°C at night.
Yes — July is the coldest month of the year in Whanganui, averaging 9.9°C.
For July in Whanganui, pack warm layers and a jacket for chilly mornings, with typical highs of 12.1°C and lows of 7.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 86% — quite humid.
Average wind speed in July is 4.7 m/s. The windiest July on record averaged 6.2 m/s (2016).
The wettest July on record was 2022 with 221 mm. On average, July sees 98 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 Whanganui behaves each July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
