July is one of the cooler months of the year in Blenheim, with average highs near 9.2°C and lows around 2.9°C (mean 6.1°C). It is a relatively wet time of year, averaging 89 mm of rainfall and 90% relative humidity across the period.
July is one of the cooler months of the year in Blenheim. Across 45 years of records, the warmest July in Blenheim was 2000 — when the month averaged 7.8°C — while the coldest was 1995 at 4.5°C. Typical July days reach 9.2°C with nights near 2.9°C. The long-term trend is warming, about 0.3°C per decade.
July is a relatively wet time of year in Blenheim, averaging 89 mm of rainfall. The wettest July on record was 2022 with 254 mm, while the driest was 2003 at 29 mm.
Relative humidity in Blenheim during July averages 90%. The most humid July was 2019 at 93%, and the least humid was 2001 at 87%.
July receives about 1.8 kWh/m²/day of solar energy in Blenheim. The sunniest Julys were 1989 and 2023 at 2.1 kWh/m²/day, and the cloudiest was 1984 at 1.4.
Average wind speed in Blenheim during July is 2.1 m/s. The windiest Julys were 2011 and 2016 at 2.6 m/s, while the calmest were 1991 and 1993 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 5.8°C | 5.7°C | 6.0°C | 6.3°C | 6.8°C | +1°C |
| Avg High | 8.9°C | 8.8°C | 9.1°C | 9.4°C | 9.8°C | +0.9°C |
| Avg Low | 2.6°C | 2.6°C | 2.9°C | 3.1°C | 3.8°C | +1.2°C |
| Avg Rain | 83 mm | 101 mm | 67 mm | 80 mm | 126 mm | +43 mm |
July temperatures in Blenheim have risen by about 0.9°C between 1981–1985 and 2021–2025.
July has ranged from a record low of -2.5°C (2011) to a record high of 14.3°C (1998).
Rainfall in July is a relatively wet time of year, averaging 89 mm, with a wettest year of 254 mm.
A quieter season to visit Blenheim
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Blenheim. That said, July — with days averaging 9.2°C and nights around 2.9°C (mean 6.1°C) and higher rainfall (89 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 | 9.9°C | 7.2°C | 4.6°C | 11.6°C | 1.0°C | 140 mm | 93% | 1.7 m/s | 1.8 |
| 2024 | 10.0°C | 6.8°C | 3.7°C | 13.9°C | -0.1°C | 97 mm | 91% | 1.8 m/s | 1.9 |
| 2023 | 10.1°C | 6.6°C | 3.1°C | 13.6°C | -0.7°C | 108 mm | 91% | 2 m/s | 2.1 |
| 2022 🌧️ | 9.5°C | 6.7°C | 3.9°C | 12.4°C | -0.1°C | 254 mm | 92% | 2.2 m/s | 1.6 |
| 2021 | 10.0°C | 6.9°C | 3.8°C | 13.9°C | 0.1°C | 107 mm | 91% | 2.1 m/s | 1.9 |
| 2020 | 9.3°C | 6.4°C | 3.4°C | 12.1°C | 0.0°C | 52 mm | 91% | 2 m/s | 1.9 |
| 2019 | 10.4°C | 7.7°C | 5.0°C | 13.4°C | 1.1°C | 168 mm | 93% | 2.1 m/s | 1.6 |
| 2018 | 9.8°C | 6.8°C | 3.7°C | 12.0°C | 1.5°C | 81 mm | 93% | 2.2 m/s | 1.8 |
| 2017 | 8.5°C | 5.5°C | 2.5°C | 11.8°C | -1.0°C | 131 mm | 92% | 2.1 m/s | 1.8 |
| 2016 | 9.9°C | 6.5°C | 3.0°C | 13.6°C | -0.2°C | 59 mm | 88% | 2.6 m/s | 2 |
| 2015 | 8.8°C | 5.5°C | 2.2°C | 11.9°C | -1.7°C | 69 mm | 89% | 2.1 m/s | 1.9 |
| 2014 | 8.8°C | 5.7°C | 2.6°C | 13.3°C | -0.9°C | 39 mm | 89% | 2.1 m/s | 1.9 |
| 2013 | 10.1°C | 7.0°C | 3.8°C | 14.0°C | -0.2°C | 71 mm | 91% | 2.3 m/s | 1.9 |
| 2012 | 9.5°C | 6.6°C | 3.8°C | 13.2°C | -0.2°C | 74 mm | 91% | 2 m/s | 1.7 |
| 2011 | 8.9°C | 5.4°C | 2.0°C | 11.9°C | -2.5°C | 49 mm | 88% | 2.6 m/s | 1.9 |
| 2010 | 8.9°C | 5.8°C | 2.6°C | 11.1°C | 0.3°C | 61 mm | 90% | 1.7 m/s | 1.9 |
| 2009 | 8.4°C | 5.2°C | 2.1°C | 11.8°C | -0.6°C | 46 mm | 90% | 2 m/s | 1.8 |
| 2008 | 8.9°C | 6.0°C | 3.1°C | 12.0°C | -0.8°C | 147 mm | 90% | 2.4 m/s | 1.6 |
| 2007 | 8.7°C | 6.0°C | 3.3°C | 12.9°C | -1.3°C | 85 mm | 92% | 2.3 m/s | 1.7 |
| 2006 | 9.4°C | 6.1°C | 2.9°C | 11.8°C | -1.0°C | 92 mm | 91% | 2.5 m/s | 1.9 |
| 2005 | 10.3°C | 7.2°C | 4.1°C | 12.9°C | -0.4°C | 82 mm | 91% | 2.1 m/s | 1.7 |
| 2004 | 8.7°C | 5.4°C | 2.1°C | 11.8°C | 0.4°C | 69 mm | 88% | 1.9 m/s | 2 |
| 2003 | 8.7°C | 5.2°C | 1.8°C | 11.0°C | -1.4°C | 29 mm | 89% | 1.9 m/s | 2 |
| 2002 | 9.0°C | 6.1°C | 3.1°C | 13.5°C | -0.3°C | 34 mm | 90% | 2.3 m/s | 1.8 |
| 2001 | 8.6°C | 5.1°C | 1.7°C | 12.4°C | -1.2°C | 54 mm | 87% | 1.7 m/s | 1.9 |
| 2000 🔥 | 10.7°C | 7.8°C | 4.9°C | 13.0°C | -0.2°C | 32 mm | 89% | 2.2 m/s | 1.9 |
| 1999 | 9.6°C | 6.1°C | 2.6°C | 13.5°C | -1.8°C | 69 mm | 90% | 1.9 m/s | 1.8 |
| 1998 | 10.8°C | 7.7°C | 4.7°C | 14.3°C | 1.2°C | 153 mm | 91% | 2.3 m/s | 1.8 |
| 1997 | 8.8°C | 5.4°C | 1.9°C | 11.3°C | -0.6°C | 61 mm | 89% | 2 m/s | 2 |
| 1996 | 7.8°C | 5.3°C | 2.8°C | 11.0°C | -0.9°C | 181 mm | 93% | 2 m/s | 1.7 |
| 1995 ❄️ | 7.5°C | 4.5°C | 1.4°C | 10.1°C | -1.7°C | 86 mm | 90% | 2.1 m/s | 1.8 |
| 1994 | 8.0°C | 5.1°C | 2.2°C | 10.6°C | -1.0°C | 127 mm | 91% | 2.1 m/s | 1.7 |
| 1993 | 9.4°C | 6.2°C | 2.9°C | 12.8°C | -0.7°C | 38 mm | 91% | 1.6 m/s | 2 |
| 1992 | 8.4°C | 5.6°C | 2.9°C | 11.0°C | -0.6°C | 145 mm | 91% | 2.4 m/s | 1.8 |
| 1991 | 8.3°C | 5.1°C | 2.0°C | 10.4°C | -1.0°C | 74 mm | 90% | 1.6 m/s | 1.9 |
| 1990 | 9.4°C | 6.1°C | 2.8°C | 12.3°C | 0.0°C | 80 mm | 91% | 1.8 m/s | 1.8 |
| 1989 | 8.7°C | 5.3°C | 1.8°C | 11.7°C | -0.2°C | 59 mm | 87% | 1.7 m/s | 2.1 |
| 1988 | 9.7°C | 6.4°C | 3.0°C | 12.8°C | -0.6°C | 91 mm | 89% | 2.4 m/s | 1.9 |
| 1987 | 8.8°C | 5.8°C | 2.7°C | 11.4°C | 0.3°C | 51 mm | 90% | 1.7 m/s | 1.9 |
| 1986 | 8.0°C | 4.7°C | 1.4°C | 10.4°C | -1.8°C | 67 mm | 88% | 2 m/s | 1.9 |
| 1985 | 9.5°C | 6.4°C | 3.3°C | 12.6°C | 0.3°C | 97 mm | 91% | 2.2 m/s | 1.8 |
| 1984 | 9.4°C | 6.6°C | 3.8°C | 12.5°C | -0.4°C | 136 mm | 91% | 2.1 m/s | 1.4 |
| 1983 | 8.6°C | 5.3°C | 2.0°C | 13.1°C | -0.5°C | 92 mm | 89% | 2.1 m/s | — |
| 1982 | 8.6°C | 5.5°C | 2.5°C | 11.4°C | -0.9°C | 48 mm | 89% | 2.1 m/s | — |
| 1981 | 8.8°C | 5.9°C | 3.0°C | 12.8°C | 0.0°C | 105 mm | 91% | 2.4 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 9.2°C with lows near 2.9°C (mean 6.1°C), based on 45 years of NASA POWER data.
July averages 89 mm of rainfall in Blenheim, a relatively wet time of year. The wettest on record was 254 mm in 2022.
The hottest July reached 14.3°C in 1998. The coldest dipped to -2.5°C in 2011.
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 9°C to 9.9°C and overnight lows from 2.9°C to 3.8°C over the same span.
July is one of the cooler months of the year in Blenheim and a relatively wet time of year, so plan for around 9.2°C daytime highs and 2.9°C at night.
Yes — July is the coldest month of the year in Blenheim, averaging 6.1°C.
For July in Blenheim, pack warm layers and a jacket for chilly mornings, with typical highs of 9.2°C and lows of 2.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 90% — quite humid.
Average wind speed in July is 2.1 m/s. The windiest July on record averaged 2.6 m/s (2011).
The wettest July on record was 2022 with 254 mm. On average, July sees 89 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 Blenheim 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.
