July is one of the warmer months of the year in San Diego, with average highs near 32.5°C and lows around 17.1°C (mean 24.8°C). It is one of the drier months, averaging 6 mm of rainfall and 47% relative humidity across the period.
July is one of the warmer months of the year in San Diego. Across 45 years of records, the warmest July in San Diego was 2006 — when the month averaged 28.5°C — while the coldest was 1993 at 21°C. Typical July days reach 32.5°C with nights near 17.1°C. The long-term trend is warming, about 0.3°C per decade.
July is one of the drier months in San Diego, averaging 6 mm of rainfall. The wettest July on record was 1984 with 43 mm, while the driest were 1993 and 2020 at 0 mm.
Relative humidity in San Diego during July averages 47%. The most humid July was 1993 at 61%, and the least humid was 1981 at 34%.
July receives about 6.1 kWh/m²/day of solar energy in San Diego. The sunniest July was 2020 at 7 kWh/m²/day, and the cloudiest was 2010 at 5.1.
Average wind speed in San Diego during July is 2.3 m/s. The windiest Julys were 1987, 1993 and 2010 at 2.6 m/s, while the calmest were 2018, 2019 and 2023, among others at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.7°C | 23.9°C | 25.4°C | 24.8°C | 25.4°C | +0.7°C |
| Avg High | 32.5°C | 31.5°C | 33.1°C | 32.3°C | 33.2°C | +0.7°C |
| Avg Low | 16.9°C | 16.2°C | 17.7°C | 17.3°C | 17.6°C | +0.7°C |
| Avg Rain | 10 mm | 6 mm | 5 mm | 7 mm | 2 mm | -7 mm |
July temperatures in San Diego have risen by about 0.5°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 9.8°C (1998) to a record high of 43.8°C (2006).
Rainfall in July is one of the drier months, averaging 6 mm, with a wettest year of 43 mm.
One of the best times to visit San Diego
July is one of the best times to visit San Diego. Expect days averaging 32.5°C and nights around 17.1°C (mean 24.8°C) — warmer than San Diego's yearly average — with low rainfall (6 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 | 30.8°C | 22.8°C | 14.8°C | 35.6°C | 12.2°C | 1 mm | 52% | 2.5 m/s | 6.3 |
| 2024 | 35.3°C | 27.4°C | 19.5°C | 42.0°C | 15.5°C | 3 mm | 39% | 2.1 m/s | 6.1 |
| 2023 | 34.1°C | 26.2°C | 18.4°C | 37.8°C | 11.2°C | 1 mm | 41% | 2 m/s | 6.1 |
| 2022 | 32.8°C | 25.3°C | 17.7°C | 36.4°C | 12.9°C | 1 mm | 45% | 2.3 m/s | 6.2 |
| 2021 | 34.0°C | 26.6°C | 19.2°C | 37.2°C | 16.5°C | 8 mm | 42% | 2.2 m/s | 6.4 |
| 2020 | 32.0°C | 23.9°C | 15.9°C | 38.6°C | 12.4°C | 0 mm | 46% | 2.5 m/s | 7 |
| 2019 | 31.9°C | 24.1°C | 16.3°C | 37.2°C | 11.2°C | 4 mm | 45% | 2 m/s | 5.9 |
| 2018 | 35.2°C | 27.6°C | 20.0°C | 42.6°C | 13.3°C | 5 mm | 44% | 2 m/s | 6.4 |
| 2017 | 34.5°C | 26.7°C | 18.8°C | 40.0°C | 13.2°C | 3 mm | 45% | 2 m/s | 6.1 |
| 2016 | 33.4°C | 25.4°C | 17.5°C | 40.7°C | 12.8°C | 3 mm | 43% | 2.3 m/s | 6.8 |
| 2015 | 30.1°C | 23.2°C | 16.3°C | 34.6°C | 12.8°C | 22 mm | 60% | 2.5 m/s | 6.1 |
| 2014 | 33.0°C | 25.5°C | 18.0°C | 39.2°C | 14.0°C | 4 mm | 48% | 2.4 m/s | 6.6 |
| 2013 | 32.1°C | 24.9°C | 17.8°C | 36.8°C | 12.8°C | 11 mm | 48% | 2.3 m/s | 5.4 |
| 2012 | 31.5°C | 23.9°C | 16.3°C | 37.5°C | 11.8°C | 13 mm | 46% | 2.1 m/s | 6.1 |
| 2011 | 31.3°C | 23.8°C | 16.2°C | 37.4°C | 11.7°C | 6 mm | 51% | 2.3 m/s | 6.4 |
| 2010 | 30.0°C | 22.7°C | 15.4°C | 37.5°C | 10.1°C | 3 mm | 53% | 2.6 m/s | 5.1 |
| 2009 | 33.8°C | 26.0°C | 18.1°C | 39.7°C | 12.2°C | 0 mm | 43% | 2.3 m/s | 6.8 |
| 2008 | 33.3°C | 25.5°C | 17.7°C | 38.5°C | 12.6°C | 2 mm | 46% | 2.1 m/s | 5.9 |
| 2007 | 33.4°C | 25.6°C | 17.9°C | 39.4°C | 13.3°C | 0 mm | 45% | 2 m/s | 5.8 |
| 2006 🔥 | 35.7°C | 28.5°C | 21.3°C | 43.8°C | 18.0°C | 10 mm | 46% | 2.2 m/s | 6.6 |
| 2005 | 33.7°C | 26.0°C | 18.3°C | 38.6°C | 12.8°C | 13 mm | 50% | 2.1 m/s | 5.7 |
| 2004 | 32.8°C | 24.8°C | 16.9°C | 37.3°C | 11.6°C | 1 mm | 47% | 2.4 m/s | 6.6 |
| 2003 | 33.6°C | 26.1°C | 18.6°C | 39.0°C | 13.3°C | 11 mm | 46% | 2.2 m/s | 5.7 |
| 2002 | 32.4°C | 24.6°C | 16.7°C | 38.3°C | 12.5°C | 1 mm | 49% | 2.4 m/s | 5.7 |
| 2001 | 31.0°C | 23.3°C | 15.5°C | 37.6°C | 11.7°C | 6 mm | 50% | 2.3 m/s | 6.2 |
| 2000 | 31.5°C | 23.7°C | 15.9°C | 38.0°C | 10.9°C | 5 mm | 48% | 2.5 m/s | 6.4 |
| 1999 | 30.6°C | 23.5°C | 16.4°C | 35.1°C | 11.4°C | 16 mm | 52% | 2.3 m/s | 6.5 |
| 1998 | 31.1°C | 23.8°C | 16.4°C | 38.1°C | 9.8°C | 4 mm | 56% | 2.1 m/s | 6 |
| 1997 | 31.0°C | 22.8°C | 14.7°C | 36.9°C | 12.1°C | 5 mm | 52% | 2.4 m/s | 6.4 |
| 1996 | 33.6°C | 26.1°C | 18.6°C | 38.0°C | 14.2°C | 3 mm | 45% | 2.3 m/s | 6.7 |
| 1995 | 32.5°C | 24.5°C | 16.6°C | 42.3°C | 12.0°C | 2 mm | 48% | 2.1 m/s | 6.2 |
| 1994 | 31.7°C | 24.1°C | 16.5°C | 36.2°C | 12.0°C | 1 mm | 49% | 2.4 m/s | 5.3 |
| 1993 ❄️ | 28.4°C | 21.0°C | 13.5°C | 35.5°C | 11.8°C | 0 mm | 61% | 2.6 m/s | 5.5 |
| 1992 | 31.9°C | 24.4°C | 16.9°C | 37.8°C | 10.8°C | 4 mm | 53% | 2.5 m/s | 5.8 |
| 1991 | 30.3°C | 22.6°C | 14.9°C | 37.2°C | 11.3°C | 19 mm | 55% | 2.5 m/s | 5.3 |
| 1990 | 33.4°C | 25.7°C | 17.9°C | 37.0°C | 13.3°C | 5 mm | 42% | 2.2 m/s | 6.7 |
| 1989 | 33.8°C | 25.5°C | 17.2°C | 40.1°C | 12.8°C | 3 mm | 42% | 2.2 m/s | 6.3 |
| 1988 | 33.4°C | 25.5°C | 17.5°C | 37.6°C | 12.6°C | 2 mm | 47% | 2.2 m/s | 5.2 |
| 1987 | 29.6°C | 21.6°C | 13.6°C | 37.2°C | 10.8°C | 2 mm | 52% | 2.6 m/s | 5.8 |
| 1986 | 31.1°C | 23.5°C | 15.8°C | 37.1°C | 11.7°C | 15 mm | 44% | 2.4 m/s | 6.4 |
| 1985 | 34.3°C | 26.3°C | 18.4°C | 39.7°C | 13.3°C | 17 mm | 40% | 2.2 m/s | 6.1 |
| 1984 🌧️ | 33.5°C | 26.6°C | 19.6°C | 37.9°C | 15.5°C | 43 mm | 51% | 2 m/s | 6.4 |
| 1983 | 31.0°C | 23.3°C | 15.6°C | 39.3°C | 11.4°C | 1 mm | 46% | 2.2 m/s | — |
| 1982 | 31.9°C | 24.0°C | 16.1°C | 37.5°C | 10.0°C | 4 mm | 42% | 2.2 m/s | — |
| 1981 | 34.0°C | 26.0°C | 18.1°C | 38.0°C | 14.4°C | 0 mm | 34% | 2.3 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 32.5°C with lows near 17.1°C (mean 24.8°C), based on 45 years of NASA POWER data.
July averages 6 mm of rainfall in San Diego, one of the drier months. The wettest on record was 43 mm in 1984.
The hottest July reached 43.8°C in 2006. The coldest dipped to 9.8°C in 1998.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 0.5°C. Daytime highs moved from 32.9°C to 33.4°C and overnight lows from 17.6°C to 17.9°C over the same span.
July is one of the warmer months of the year in San Diego and one of the drier months, so plan for around 32.5°C daytime highs and 17.1°C at night.
Not quite — July is the 11th coolest month in San Diego, averaging 24.8°C.
For July in San Diego, pack light, breathable clothing and sun protection, with typical highs of 32.5°C and lows of 17.1°C.
Relative humidity in July averages 47% — relatively dry.
Average wind speed in July is 2.3 m/s. The windiest July on record averaged 2.6 m/s (1987).
The wettest July on record was 1984 with 43 mm. On average, July sees 6 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 San Diego 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.
