July is one of the warmer months of the year in Donna, with average highs near 35.5°C and lows around 24.8°C (mean 30.2°C). It is a relatively wet time of year, averaging 62 mm of rainfall and 68% relative humidity across the period.
July is one of the warmer months of the year in Donna. Across 45 years of records, the warmest July in Donna was 2023 — when the month averaged 32.3°C — while the coldest was 2008 at 28.2°C. Typical July days reach 35.5°C with nights near 24.8°C. The long-term trend is warming, about 0.2°C per decade.
July is a relatively wet time of year in Donna, averaging 62 mm of rainfall. The wettest July on record was 2021 with 249 mm, while the driest was 1982 at 1 mm.
Relative humidity in Donna during July averages 68%. The most humid July was 2021 at 80%, and the least humid was 2000 at 58%.
July receives about 6.9 kWh/m²/day of solar energy in Donna. The sunniest Julys were 1993 and 2000 at 7.5 kWh/m²/day, and the cloudiest was 2008 at 5.9.
Average wind speed in Donna during July is 3.8 m/s. The windiest Julys were 1992 and 2009 at 4.6 m/s, while the calmest was 2021 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 29.7°C | 30.2°C | 30.2°C | 30.3°C | 30.4°C | +0.7°C |
| Avg High | 35.1°C | 35.5°C | 35.6°C | 35.7°C | 35.5°C | +0.4°C |
| Avg Low | 24.4°C | 24.8°C | 24.9°C | 24.8°C | 25.3°C | +0.9°C |
| Avg Rain | 48 mm | 30 mm | 96 mm | 42 mm | 112 mm | +65 mm |
July temperatures in Donna have risen by about 0.7°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 20.1°C (2019) to a record high of 42.5°C (2005).
Rainfall in July is a relatively wet time of year, averaging 62 mm, with a wettest year of 249 mm.
A quieter season to visit Donna
If your dates are flexible, the more temperate months of March and November tend to be the most comfortable for visiting Donna. That said, July — with days averaging 35.5°C and nights around 24.8°C (mean 30.2°C) and moderate rainfall (62 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 34.0°C | 29.3°C | 24.6°C | 38.0°C | 22.4°C | 99 mm | 75% | 3.8 m/s | 6.6 |
| 2024 | 35.1°C | 30.2°C | 25.4°C | 38.6°C | 24.2°C | 150 mm | 72% | 3 m/s | 6.3 |
| 2023 🔥 | 38.3°C | 32.3°C | 26.3°C | 40.2°C | 24.2°C | 25 mm | 64% | 4.1 m/s | 7.3 |
| 2022 | 37.4°C | 31.5°C | 25.7°C | 40.9°C | 23.4°C | 12 mm | 64% | 4.3 m/s | 7.4 |
| 2021 🌧️ | 32.4°C | 28.3°C | 24.3°C | 35.8°C | 22.3°C | 249 mm | 80% | 2.9 m/s | 6.4 |
| 2020 | 36.0°C | 30.7°C | 25.4°C | 40.5°C | 23.8°C | 138 mm | 69% | 4 m/s | 6.8 |
| 2019 | 36.4°C | 30.8°C | 25.2°C | 39.7°C | 20.1°C | 32 mm | 65% | 3.9 m/s | 7.2 |
| 2018 | 36.3°C | 30.5°C | 24.7°C | 41.3°C | 23.1°C | 25 mm | 67% | 3.5 m/s | 7.3 |
| 2017 | 35.6°C | 30.2°C | 24.8°C | 40.1°C | 21.9°C | 35 mm | 67% | 3.7 m/s | 6.8 |
| 2016 | 35.9°C | 30.7°C | 25.5°C | 38.4°C | 24.0°C | 7 mm | 68% | 4.3 m/s | 7.3 |
| 2015 | 35.9°C | 30.3°C | 24.7°C | 39.6°C | 21.6°C | 25 mm | 68% | 4.5 m/s | 7.3 |
| 2014 | 36.4°C | 30.4°C | 24.4°C | 39.4°C | 22.5°C | 36 mm | 65% | 4 m/s | 6.8 |
| 2013 | 36.0°C | 30.3°C | 24.6°C | 39.9°C | 23.2°C | 44 mm | 64% | 3.8 m/s | 6.5 |
| 2012 | 36.1°C | 30.5°C | 24.9°C | 39.8°C | 23.5°C | 19 mm | 64% | 4.1 m/s | 6.7 |
| 2011 | 36.1°C | 30.4°C | 24.8°C | 39.1°C | 22.0°C | 28 mm | 67% | 3.8 m/s | 7.2 |
| 2010 | 32.7°C | 28.7°C | 24.7°C | 35.3°C | 22.2°C | 171 mm | 80% | 3.2 m/s | 6.2 |
| 2009 | 38.5°C | 32.0°C | 25.5°C | 41.6°C | 23.8°C | 5 mm | 60% | 4.6 m/s | 7.4 |
| 2008 ❄️ | 32.8°C | 28.2°C | 23.6°C | 37.7°C | 22.3°C | 234 mm | 76% | 3.9 m/s | 5.9 |
| 2007 | 32.6°C | 28.6°C | 24.7°C | 37.3°C | 23.2°C | 210 mm | 79% | 3.3 m/s | 6.1 |
| 2006 | 35.2°C | 30.1°C | 25.0°C | 38.5°C | 23.4°C | 95 mm | 67% | 3.6 m/s | 6.7 |
| 2005 | 36.5°C | 31.0°C | 25.5°C | 42.5°C | 22.3°C | 215 mm | 66% | 3.6 m/s | 6.7 |
| 2004 | 36.4°C | 30.5°C | 24.6°C | 40.1°C | 22.3°C | 16 mm | 65% | 3.6 m/s | 7.1 |
| 2003 | 35.2°C | 30.2°C | 25.2°C | 38.1°C | 23.5°C | 64 mm | 67% | 3.7 m/s | 6.5 |
| 2002 | 34.7°C | 29.8°C | 25.0°C | 38.6°C | 23.0°C | 65 mm | 70% | 4.1 m/s | 6.6 |
| 2001 | 35.9°C | 30.2°C | 24.6°C | 39.0°C | 22.8°C | 48 mm | 66% | 3.9 m/s | 7.3 |
| 2000 | 38.0°C | 31.4°C | 24.9°C | 41.0°C | 22.9°C | 10 mm | 58% | 4.4 m/s | 7.5 |
| 1999 | 33.7°C | 29.0°C | 24.2°C | 38.8°C | 21.5°C | 91 mm | 71% | 3.5 m/s | 6.5 |
| 1998 | 37.3°C | 31.5°C | 25.6°C | 40.2°C | 23.8°C | 19 mm | 64% | 4.1 m/s | 7.2 |
| 1997 | 36.5°C | 30.7°C | 24.9°C | 39.5°C | 22.5°C | 6 mm | 65% | 3.9 m/s | 7.3 |
| 1996 | 37.7°C | 31.7°C | 25.7°C | 39.9°C | 23.3°C | 7 mm | 59% | 4.1 m/s | 7.3 |
| 1995 | 36.4°C | 30.7°C | 25.0°C | 40.4°C | 23.2°C | 48 mm | 63% | 3.6 m/s | 7 |
| 1994 | 36.8°C | 31.0°C | 25.2°C | 39.9°C | 23.9°C | 25 mm | 63% | 4.4 m/s | 7.1 |
| 1993 | 33.4°C | 28.8°C | 24.1°C | 36.0°C | 23.1°C | 25 mm | 75% | 4.3 m/s | 7.5 |
| 1992 | 34.8°C | 29.9°C | 24.9°C | 40.0°C | 22.9°C | 20 mm | 68% | 4.6 m/s | 6.9 |
| 1991 | 33.7°C | 28.7°C | 23.8°C | 39.6°C | 21.8°C | 31 mm | 71% | 3.4 m/s | 6.7 |
| 1990 | 34.8°C | 29.8°C | 24.8°C | 38.8°C | 23.2°C | 32 mm | 65% | 3.7 m/s | 6.3 |
| 1989 | 36.2°C | 30.3°C | 24.5°C | 40.0°C | 22.4°C | 30 mm | 63% | 3.6 m/s | 6.7 |
| 1988 | 34.9°C | 29.9°C | 24.8°C | 37.6°C | 22.9°C | 52 mm | 68% | 3.5 m/s | 6.5 |
| 1987 | 34.1°C | 29.2°C | 24.3°C | 37.1°C | 22.1°C | 100 mm | 71% | 3.6 m/s | 6.7 |
| 1986 | 36.0°C | 30.2°C | 24.3°C | 38.3°C | 22.3°C | 9 mm | 64% | 4.3 m/s | 7.2 |
| 1985 | 34.1°C | 28.8°C | 23.4°C | 37.0°C | 21.3°C | 40 mm | 70% | 3.5 m/s | 6.9 |
| 1984 | 34.8°C | 29.3°C | 23.8°C | 37.9°C | 22.6°C | 34 mm | 65% | 3.4 m/s | 6.1 |
| 1983 | 34.4°C | 29.4°C | 24.5°C | 37.6°C | 22.5°C | 105 mm | 70% | 3.5 m/s | — |
| 1982 | 36.7°C | 30.8°C | 24.9°C | 38.5°C | 23.3°C | 1 mm | 63% | 4.4 m/s | — |
| 1981 | 34.5°C | 29.6°C | 24.7°C | 37.0°C | 23.2°C | 57 mm | 70% | 3.5 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 35.5°C with lows near 24.8°C (mean 30.2°C), based on 45 years of NASA POWER data.
July averages 62 mm of rainfall in Donna, a relatively wet time of year. The wettest on record was 249 mm in 2021.
The hottest July reached 42.5°C in 2005. The coldest dipped to 20.1°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 0.7°C. Daytime highs moved from 34.9°C to 35.4°C and overnight lows from 24.3°C to 25.3°C over the same span.
July is one of the warmer months of the year in Donna and a relatively wet time of year, so plan for around 35.5°C daytime highs and 24.8°C at night.
Not quite — July is the 10th coolest month in Donna, averaging 30.2°C.
For July in Donna, pack light, breathable clothing and sun protection, with typical highs of 35.5°C and lows of 24.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 68% — moderately humid.
Average wind speed in July is 3.8 m/s. The windiest July on record averaged 4.6 m/s (1992).
The wettest July on record was 2021 with 249 mm. On average, July sees 62 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 Donna 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.
