July is one of the warmer months of the year in Pasadena, with average highs near 29.9°C and lows around 17.6°C (mean 23.8°C). It is one of the drier months, averaging 2 mm of rainfall and 51% 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 2006 — when the month averaged 27.1°C — while the coldest was 1993 at 21°C. Typical July days reach 29.9°C with nights near 17.6°C. The long-term July temperature trend is broadly flat.
July is one of the drier months in Pasadena, averaging 2 mm of rainfall. The wettest July on record was 2015 with 24 mm, while the driest were 2016, 2020 and 2023, among others at 0 mm.
Relative humidity in Pasadena during July averages 51%. The most humid July was 1993 at 65%, and the least humid was 1981 at 38%.
July receives about 7.8 kWh/m²/day of solar energy in Pasadena. The sunniest July was 2020 at 8.5 kWh/m²/day, and the cloudiest was 1988 at 7.
Average wind speed in Pasadena during July is 1.8 m/s. The windiest July was 1985 at 2 m/s, while the calmest were 2023 and 2024 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.0°C | 23.2°C | 24.2°C | 23.6°C | 23.8°C | -0.2°C |
| Avg High | 30.4°C | 29.2°C | 30.4°C | 29.6°C | 29.9°C | -0.5°C |
| Avg Low | 17.5°C | 17.2°C | 18.1°C | 17.6°C | 17.8°C | +0.3°C |
| Avg Rain | 1 mm | 2 mm | 1 mm | 3 mm | 1 mm | -1 mm |
July temperatures in Pasadena have fallen by about 0.5°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 12.3°C (1982) to a record high of 42.3°C (2018).
Rainfall in July is one of the drier months, averaging 2 mm, with a wettest year of 24 mm.
One of the best times to visit Pasadena
July is one of the best times to visit Pasadena. Expect days averaging 29.9°C and nights around 17.6°C (mean 23.8°C) — warmer than Pasadena's yearly average — with low rainfall (2 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 | 28.0°C | 21.9°C | 15.8°C | 32.9°C | 13.5°C | 0 mm | 57% | 1.9 m/s | 8.2 |
| 2024 | 31.0°C | 25.0°C | 19.0°C | 35.2°C | 16.3°C | 0 mm | 46% | 1.6 m/s | 8 |
| 2023 | 30.7°C | 24.7°C | 18.7°C | 33.9°C | 12.8°C | 0 mm | 50% | 1.6 m/s | 8.1 |
| 2022 | 29.8°C | 23.8°C | 17.7°C | 33.7°C | 14.2°C | 1 mm | 50% | 1.8 m/s | 8 |
| 2021 | 30.8°C | 24.8°C | 18.9°C | 34.3°C | 15.9°C | 2 mm | 46% | 1.8 m/s | 7.7 |
| 2020 | 29.2°C | 22.9°C | 16.6°C | 34.6°C | 13.5°C | 0 mm | 52% | 1.7 m/s | 8.5 |
| 2019 | 29.2°C | 23.2°C | 17.2°C | 35.3°C | 13.5°C | 0 mm | 52% | 1.7 m/s | 8.1 |
| 2018 | 32.5°C | 26.3°C | 20.0°C | 42.3°C | 14.5°C | 1 mm | 48% | 1.9 m/s | 7.7 |
| 2017 | 31.2°C | 24.9°C | 18.6°C | 35.8°C | 13.8°C | 0 mm | 48% | 1.8 m/s | 8 |
| 2016 | 30.6°C | 24.3°C | 17.9°C | 37.6°C | 14.1°C | 0 mm | 46% | 1.9 m/s | 8.4 |
| 2015 🌧️ | 28.5°C | 22.8°C | 17.2°C | 31.6°C | 14.0°C | 24 mm | 62% | 1.9 m/s | 7.5 |
| 2014 | 30.2°C | 24.2°C | 18.2°C | 34.8°C | 14.8°C | 1 mm | 52% | 1.9 m/s | 7.7 |
| 2013 | 29.6°C | 23.7°C | 17.9°C | 34.4°C | 13.9°C | 2 mm | 49% | 1.9 m/s | 7.2 |
| 2012 | 28.8°C | 22.5°C | 16.3°C | 33.6°C | 13.1°C | 2 mm | 47% | 1.8 m/s | 8 |
| 2011 | 28.5°C | 22.6°C | 16.7°C | 32.5°C | 13.4°C | 3 mm | 55% | 1.7 m/s | 8 |
| 2010 | 27.3°C | 21.5°C | 15.7°C | 34.5°C | 12.8°C | 1 mm | 57% | 1.7 m/s | 8 |
| 2009 | 30.9°C | 24.5°C | 18.1°C | 35.5°C | 13.8°C | 0 mm | 48% | 1.7 m/s | 8.3 |
| 2008 | 30.5°C | 24.2°C | 17.9°C | 33.4°C | 15.1°C | 2 mm | 52% | 1.9 m/s | 7.9 |
| 2007 | 30.6°C | 24.3°C | 17.9°C | 34.5°C | 14.8°C | 0 mm | 50% | 1.9 m/s | 8 |
| 2006 🔥 | 33.0°C | 27.1°C | 21.2°C | 38.6°C | 17.2°C | 2 mm | 49% | 1.9 m/s | 7.7 |
| 2005 | 30.4°C | 24.4°C | 18.5°C | 34.3°C | 13.9°C | 2 mm | 56% | 1.7 m/s | 8 |
| 2004 | 29.8°C | 23.5°C | 17.3°C | 33.4°C | 14.1°C | 0 mm | 52% | 1.8 m/s | 8.2 |
| 2003 | 31.2°C | 25.0°C | 18.8°C | 35.6°C | 15.2°C | 3 mm | 50% | 1.8 m/s | 7.6 |
| 2002 | 29.6°C | 23.5°C | 17.3°C | 35.3°C | 14.5°C | 0 mm | 53% | 1.8 m/s | 8 |
| 2001 | 28.4°C | 22.5°C | 16.6°C | 33.7°C | 13.4°C | 1 mm | 56% | 1.8 m/s | 7.9 |
| 2000 | 29.2°C | 23.0°C | 16.9°C | 34.9°C | 12.8°C | 1 mm | 52% | 1.9 m/s | 8.1 |
| 1999 | 28.6°C | 22.9°C | 17.2°C | 33.4°C | 13.2°C | 5 mm | 52% | 1.8 m/s | 7.9 |
| 1998 | 29.4°C | 23.6°C | 17.9°C | 35.7°C | 12.9°C | 0 mm | 57% | 1.7 m/s | 8.3 |
| 1997 | 28.9°C | 22.7°C | 16.6°C | 34.7°C | 14.1°C | 1 mm | 55% | 1.9 m/s | 7.9 |
| 1996 | 30.8°C | 24.8°C | 18.8°C | 34.9°C | 15.6°C | 1 mm | 50% | 1.8 m/s | 8.1 |
| 1995 | 29.8°C | 23.6°C | 17.3°C | 37.5°C | 13.3°C | 1 mm | 52% | 1.7 m/s | 7.8 |
| 1994 | 29.3°C | 23.1°C | 16.9°C | 33.3°C | 13.4°C | 0 mm | 55% | 1.8 m/s | 7.8 |
| 1993 ❄️ | 26.8°C | 21.0°C | 15.2°C | 32.8°C | 13.8°C | 0 mm | 65% | 1.9 m/s | 7.6 |
| 1992 | 29.5°C | 23.6°C | 17.7°C | 37.3°C | 13.1°C | 7 mm | 58% | 1.9 m/s | 7.2 |
| 1991 | 27.9°C | 21.7°C | 15.6°C | 32.0°C | 13.3°C | 3 mm | 59% | 1.7 m/s | 7.3 |
| 1990 | 30.9°C | 24.7°C | 18.5°C | 35.0°C | 14.5°C | 0 mm | 48% | 1.9 m/s | 8.1 |
| 1989 | 31.5°C | 24.8°C | 18.1°C | 37.1°C | 14.9°C | 0 mm | 45% | 1.9 m/s | 8.1 |
| 1988 | 30.9°C | 24.4°C | 17.9°C | 34.2°C | 13.7°C | 0 mm | 52% | 1.8 m/s | 7 |
| 1987 | 27.7°C | 21.3°C | 14.9°C | 33.6°C | 12.5°C | 2 mm | 53% | 1.9 m/s | 7.5 |
| 1986 | 29.0°C | 22.8°C | 16.5°C | 33.6°C | 13.9°C | 2 mm | 49% | 1.9 m/s | 7.7 |
| 1985 | 32.4°C | 25.8°C | 19.2°C | 38.5°C | 15.6°C | 1 mm | 41% | 2 m/s | 7.4 |
| 1984 | 31.9°C | 26.0°C | 20.0°C | 34.0°C | 16.8°C | 6 mm | 46% | 1.8 m/s | 7.1 |
| 1983 | 29.3°C | 22.7°C | 16.1°C | 35.0°C | 13.2°C | 0 mm | 49% | 1.8 m/s | — |
| 1982 | 29.6°C | 23.2°C | 16.7°C | 34.3°C | 12.3°C | 1 mm | 47% | 1.8 m/s | — |
| 1981 | 31.2°C | 24.8°C | 18.4°C | 34.1°C | 14.7°C | 0 mm | 38% | 1.8 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 29.9°C with lows near 17.6°C (mean 23.8°C), based on 45 years of NASA POWER data.
July averages 2 mm of rainfall in Pasadena, one of the drier months. The wettest on record was 24 mm in 2015.
The hottest July reached 42.3°C in 2018. The coldest dipped to 12.3°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have fallen by about 0.5°C. Daytime highs moved from 30.9°C to 30.1°C and overnight lows from 18.1°C to 18°C over the same span.
July is one of the warmer months of the year in Pasadena and one of the drier months, so plan for around 29.9°C daytime highs and 17.6°C at night.
Not quite — July is the 11th coolest month in Pasadena, averaging 23.8°C.
For July in Pasadena, pack light layers you can adjust through the day, with typical highs of 29.9°C and lows of 17.6°C.
Relative humidity in July averages 51% — relatively dry.
Average wind speed in July is 1.8 m/s. The windiest July on record averaged 2 m/s (1985).
The wettest July on record was 2015 with 24 mm. On average, July sees 2 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.
