July is one of the warmer months of the year in Pasadena, with average highs near 31.8°C and lows around 25.9°C (mean 28.9°C). It is about average for rainfall, averaging 122 mm of rainfall and 76% relative humidity across the period.
July is one of the warmer months of the year in Pasadena. Across 45 years of records, the warmest July in Pasadena was 2023 — when the month averaged 31.3°C — while the coldest was 2007 at 27.1°C. Typical July days reach 31.8°C with nights near 25.9°C. The long-term trend is warming, about 0.3°C per decade.
July is about average for rainfall in Pasadena, averaging 122 mm of rainfall. The wettest July on record was 2024 with 369 mm, while the driest was 1993 at 25 mm.
Relative humidity in Pasadena during July averages 76%. The most humid July was 2007 at 85%, and the least humid was 2000 at 65%.
July receives about 6.2 kWh/m²/day of solar energy in Pasadena. The sunniest July was 2015 at 7 kWh/m²/day, and the cloudiest was 2007 at 4.7.
Average wind speed in Pasadena during July is 2.8 m/s. The windiest July was 2020 at 3.3 m/s, while the calmest were 1991, 1997 and 2014 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.2°C | 28.6°C | 28.8°C | 29.1°C | 29.6°C | +1.4°C |
| Avg High | 31.1°C | 31.5°C | 31.7°C | 32.2°C | 32.8°C | +1.7°C |
| Avg Low | 25.3°C | 25.8°C | 25.9°C | 26.0°C | 26.5°C | +1.2°C |
| Avg Rain | 121 mm | 81 mm | 139 mm | 126 mm | 156 mm | +35 mm |
July temperatures in Pasadena have risen by about 1.4°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 19.9°C (1990) to a record high of 38.6°C (2000).
Rainfall in July is about average for rainfall, averaging 122 mm, with a wettest year of 369 mm.
A good time to visit Pasadena
July is a good time to visit Pasadena, with days averaging 31.8°C and nights around 25.9°C (mean 28.9°C, warmer than Pasadena's yearly average) and higher rainfall. April and October are marginally more temperate, but July still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 32.8°C | 29.6°C | 26.4°C | 35.8°C | 24.1°C | 78 mm | 75% | 2.7 m/s | 6 |
| 2024 🌧️ | 31.4°C | 28.9°C | 26.5°C | 35.5°C | 25.1°C | 369 mm | 80% | 2.4 m/s | 5.2 |
| 2023 🔥 | 35.4°C | 31.3°C | 27.1°C | 38.5°C | 26.1°C | 54 mm | 70% | 2.9 m/s | 6.6 |
| 2022 | 34.2°C | 30.6°C | 27.1°C | 36.7°C | 26.1°C | 96 mm | 71% | 3.2 m/s | 6.8 |
| 2021 | 30.7°C | 28.2°C | 25.8°C | 33.0°C | 24.4°C | 191 mm | 80% | 2.5 m/s | 5.7 |
| 2020 | 32.1°C | 29.2°C | 26.3°C | 35.3°C | 24.8°C | 151 mm | 78% | 3.3 m/s | 6.1 |
| 2019 | 32.4°C | 29.1°C | 25.8°C | 34.4°C | 21.6°C | 69 mm | 76% | 3 m/s | 6.5 |
| 2018 | 32.7°C | 29.1°C | 25.5°C | 36.3°C | 24.0°C | 193 mm | 74% | 2.4 m/s | 6.5 |
| 2017 | 32.0°C | 29.0°C | 26.1°C | 35.3°C | 23.6°C | 121 mm | 76% | 2.4 m/s | 6.2 |
| 2016 | 31.7°C | 29.2°C | 26.7°C | 33.7°C | 25.7°C | 100 mm | 79% | 2.9 m/s | 6.6 |
| 2015 | 32.1°C | 29.0°C | 25.8°C | 35.1°C | 23.1°C | 25 mm | 79% | 2.7 m/s | 7 |
| 2014 | 32.4°C | 29.0°C | 25.6°C | 35.6°C | 24.6°C | 108 mm | 75% | 2.3 m/s | 5.8 |
| 2013 | 32.8°C | 29.3°C | 25.7°C | 36.1°C | 23.4°C | 84 mm | 69% | 3.1 m/s | 6.2 |
| 2012 | 30.7°C | 28.2°C | 25.8°C | 33.7°C | 25.0°C | 207 mm | 79% | 2.6 m/s | 5.7 |
| 2011 | 33.7°C | 30.3°C | 26.9°C | 36.3°C | 25.9°C | 94 mm | 69% | 2.9 m/s | 6.4 |
| 2010 | 31.2°C | 28.8°C | 26.4°C | 33.3°C | 24.5°C | 255 mm | 80% | 2.8 m/s | 5.7 |
| 2009 | 34.1°C | 30.4°C | 26.7°C | 36.6°C | 25.2°C | 93 mm | 71% | 3.2 m/s | 6.4 |
| 2008 | 32.5°C | 29.1°C | 25.7°C | 35.2°C | 23.4°C | 91 mm | 72% | 3 m/s | 6.5 |
| 2007 ❄️ | 29.0°C | 27.1°C | 25.2°C | 31.7°C | 23.8°C | 274 mm | 85% | 2.5 m/s | 4.7 |
| 2006 | 30.0°C | 27.8°C | 25.7°C | 32.5°C | 24.6°C | 274 mm | 83% | 2.5 m/s | 5.4 |
| 2005 | 33.1°C | 29.8°C | 26.6°C | 37.2°C | 24.2°C | 172 mm | 73% | 2.6 m/s | 6.2 |
| 2004 | 31.1°C | 28.3°C | 25.5°C | 32.8°C | 23.8°C | 76 mm | 79% | 2.4 m/s | 6.5 |
| 2003 | 30.5°C | 28.1°C | 25.8°C | 32.5°C | 24.5°C | 149 mm | 80% | 2.8 m/s | 5.5 |
| 2002 | 31.1°C | 28.4°C | 25.8°C | 34.5°C | 24.3°C | 133 mm | 79% | 2.7 m/s | 6.2 |
| 2001 | 31.2°C | 28.5°C | 25.8°C | 34.0°C | 24.4°C | 95 mm | 79% | 2.4 m/s | 6.3 |
| 2000 | 34.3°C | 30.2°C | 26.0°C | 38.6°C | 23.8°C | 36 mm | 65% | 3.1 m/s | 6.9 |
| 1999 | 30.9°C | 28.3°C | 25.7°C | 33.7°C | 24.4°C | 127 mm | 79% | 2.6 m/s | 6.2 |
| 1998 | 33.5°C | 30.0°C | 26.6°C | 36.0°C | 25.2°C | 42 mm | 73% | 3.1 m/s | 6.8 |
| 1997 | 32.3°C | 29.1°C | 25.9°C | 33.5°C | 24.1°C | 65 mm | 76% | 2.3 m/s | 6.6 |
| 1996 | 32.8°C | 29.6°C | 26.4°C | 34.8°C | 24.8°C | 40 mm | 71% | 2.9 m/s | 6.7 |
| 1995 | 31.4°C | 28.5°C | 25.7°C | 35.6°C | 23.6°C | 113 mm | 77% | 3 m/s | 6.6 |
| 1994 | 31.5°C | 28.5°C | 25.5°C | 34.4°C | 22.6°C | 54 mm | 75% | 3.1 m/s | 6.6 |
| 1993 | 31.1°C | 28.4°C | 25.8°C | 33.0°C | 24.7°C | 25 mm | 79% | 2.9 m/s | 6.9 |
| 1992 | 30.2°C | 27.9°C | 25.7°C | 31.7°C | 24.0°C | 113 mm | 82% | 3 m/s | 6.1 |
| 1991 | 29.9°C | 27.6°C | 25.3°C | 32.6°C | 23.7°C | 114 mm | 82% | 2.3 m/s | 6.4 |
| 1990 | 31.1°C | 28.1°C | 25.1°C | 34.6°C | 19.9°C | 120 mm | 74% | 2.6 m/s | 5.8 |
| 1989 | 29.8°C | 27.3°C | 24.8°C | 31.4°C | 21.9°C | 138 mm | 81% | 2.7 m/s | 6.2 |
| 1988 | 31.5°C | 28.6°C | 25.6°C | 34.2°C | 24.0°C | 131 mm | 76% | 3.2 m/s | 5.9 |
| 1987 | 30.2°C | 27.8°C | 25.3°C | 31.9°C | 23.5°C | 147 mm | 80% | 2.8 m/s | 6.2 |
| 1986 | 32.5°C | 29.0°C | 25.6°C | 36.9°C | 24.6°C | 27 mm | 73% | 2.9 m/s | 6.8 |
| 1985 | 30.4°C | 27.5°C | 24.5°C | 33.7°C | 22.3°C | 126 mm | 78% | 2.7 m/s | 6.4 |
| 1984 | 32.0°C | 28.6°C | 25.2°C | 34.7°C | 22.6°C | 92 mm | 71% | 2.7 m/s | 6.6 |
| 1983 | 30.4°C | 27.9°C | 25.3°C | 32.0°C | 24.1°C | 215 mm | 80% | 3 m/s | — |
| 1982 | 32.4°C | 29.1°C | 25.9°C | 34.4°C | 24.8°C | 52 mm | 73% | 2.9 m/s | — |
| 1981 | 30.7°C | 28.2°C | 25.7°C | 33.0°C | 24.6°C | 163 mm | 81% | 2.7 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 31.8°C with lows near 25.9°C (mean 28.9°C), based on 45 years of NASA POWER data.
July averages 122 mm of rainfall in Pasadena, about average for rainfall. The wettest on record was 369 mm in 2024.
The hottest July reached 38.6°C in 2000. The coldest dipped to 19.9°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.4°C. Daytime highs moved from 31.2°C to 32.9°C and overnight lows from 25.3°C to 26.6°C over the same span.
July is one of the warmer months of the year in Pasadena and about average for rainfall, so plan for around 31.8°C daytime highs and 25.9°C at night.
Not quite — July is the 11th coolest month in Pasadena, averaging 28.9°C.
For July in Pasadena, pack light, breathable clothing and sun protection, with typical highs of 31.8°C and lows of 25.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 76% — quite humid.
Average wind speed in July is 2.8 m/s. The windiest July on record averaged 3.3 m/s (2020).
The wettest July on record was 2024 with 369 mm. On average, July sees 122 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 Pasadena 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.
