July is one of the warmer months of the year in San Bernardino, with average highs near 33.8°C and lows around 17.5°C (mean 25.7°C). It is one of the drier months, averaging 5 mm of rainfall and 41% relative humidity across the period.
July is one of the warmer months of the year in San Bernardino. Across 45 years of records, the warmest July in San Bernardino was 2006 — when the month averaged 29.2°C — while the coldest was 1993 at 21.8°C. Typical July days reach 33.8°C with nights near 17.5°C. The long-term trend is warming, about 0.3°C per decade.
July is one of the drier months in San Bernardino, averaging 5 mm of rainfall. The wettest July on record was 2015 with 32 mm, while the driest were 1994, 2004 and 2020, among others at 0 mm.
Relative humidity in San Bernardino during July averages 41%. The most humid July was 1993 at 58%, and the least humid was 1981 at 29%.
July receives about 7.8 kWh/m²/day of solar energy in San Bernardino. The sunniest July was 2020 at 8.5 kWh/m²/day, and the cloudiest was 1984 at 6.6.
Average wind speed in San Bernardino during July is 1.8 m/s. The windiest Julys were 1986 and 1987 at 2 m/s, while the calmest were 2019, 2023 and 2024, among others at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.6°C | 24.8°C | 26.3°C | 25.7°C | 26.3°C | +0.7°C |
| Avg High | 34.0°C | 32.8°C | 34.6°C | 33.7°C | 34.4°C | +0.4°C |
| Avg Low | 17.1°C | 16.8°C | 18.1°C | 17.7°C | 18.2°C | +1.1°C |
| Avg Rain | 6 mm | 5 mm | 4 mm | 6 mm | 2 mm | -4 mm |
July temperatures in San Bernardino have risen by about 0.5°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 10.2°C (1982) to a record high of 44.5°C (2018).
Rainfall in July is one of the drier months, averaging 5 mm, with a wettest year of 32 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A good time to visit San Bernardino
July is a good time to visit San Bernardino, with days averaging 33.8°C and nights around 17.5°C (mean 25.7°C, warmer than San Bernardino's yearly average) and low rainfall. June 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 | 32.2°C | 23.9°C | 15.5°C | 38.3°C | 11.9°C | 2 mm | 44% | 1.9 m/s | 8.3 |
| 2024 | 35.9°C | 27.9°C | 20.0°C | 41.8°C | 15.2°C | 1 mm | 34% | 1.7 m/s | 7.9 |
| 2023 | 35.2°C | 27.2°C | 19.2°C | 39.1°C | 11.7°C | 0 mm | 39% | 1.7 m/s | 8 |
| 2022 | 34.0°C | 26.2°C | 18.3°C | 38.5°C | 12.7°C | 4 mm | 38% | 1.8 m/s | 7.9 |
| 2021 | 35.2°C | 27.4°C | 19.6°C | 38.6°C | 16.3°C | 7 mm | 35% | 1.8 m/s | 7.5 |
| 2020 | 33.7°C | 25.1°C | 16.5°C | 40.6°C | 12.2°C | 0 mm | 40% | 1.8 m/s | 8.5 |
| 2019 | 33.3°C | 25.3°C | 17.2°C | 39.6°C | 12.1°C | 1 mm | 41% | 1.7 m/s | 8.2 |
| 2018 | 36.6°C | 28.6°C | 20.6°C | 44.5°C | 13.6°C | 4 mm | 39% | 1.8 m/s | 7.6 |
| 2017 | 35.2°C | 27.2°C | 19.1°C | 40.7°C | 14.3°C | 1 mm | 38% | 1.7 m/s | 7.9 |
| 2016 | 35.0°C | 26.4°C | 17.9°C | 42.5°C | 13.0°C | 0 mm | 35% | 1.9 m/s | 8.4 |
| 2015 🌧️ | 31.6°C | 24.1°C | 16.6°C | 34.7°C | 13.5°C | 32 mm | 53% | 1.9 m/s | 7.6 |
| 2014 | 34.3°C | 26.3°C | 18.2°C | 40.3°C | 13.7°C | 3 mm | 40% | 1.9 m/s | 7.6 |
| 2013 | 34.0°C | 26.1°C | 18.3°C | 40.1°C | 14.2°C | 6 mm | 38% | 1.8 m/s | 7.1 |
| 2012 | 32.6°C | 24.7°C | 16.7°C | 39.8°C | 10.4°C | 6 mm | 36% | 1.8 m/s | 7.9 |
| 2011 | 32.3°C | 24.4°C | 16.6°C | 37.6°C | 11.3°C | 9 mm | 46% | 1.7 m/s | 7.9 |
| 2010 | 31.9°C | 24.1°C | 16.2°C | 39.2°C | 11.6°C | 1 mm | 45% | 1.8 m/s | 8.1 |
| 2009 | 35.5°C | 27.0°C | 18.5°C | 40.0°C | 13.5°C | 0 mm | 36% | 1.8 m/s | 8.1 |
| 2008 | 34.8°C | 26.5°C | 18.2°C | 38.9°C | 14.0°C | 5 mm | 41% | 1.8 m/s | 7.8 |
| 2007 | 34.9°C | 26.6°C | 18.2°C | 41.1°C | 14.5°C | 1 mm | 37% | 1.7 m/s | 7.9 |
| 2006 🔥 | 36.8°C | 29.2°C | 21.6°C | 43.7°C | 17.3°C | 9 mm | 41% | 1.9 m/s | 7.4 |
| 2005 | 34.8°C | 26.9°C | 19.1°C | 39.4°C | 13.7°C | 10 mm | 47% | 1.7 m/s | 7.9 |
| 2004 | 34.3°C | 25.6°C | 17.0°C | 39.5°C | 11.9°C | 0 mm | 40% | 1.9 m/s | 8.2 |
| 2003 | 35.1°C | 27.1°C | 19.1°C | 40.1°C | 14.2°C | 4 mm | 40% | 1.7 m/s | 7.5 |
| 2002 | 34.0°C | 25.7°C | 17.5°C | 39.8°C | 12.9°C | 1 mm | 41% | 1.8 m/s | 8 |
| 2001 | 32.2°C | 24.1°C | 16.1°C | 37.9°C | 11.5°C | 3 mm | 46% | 1.9 m/s | 8 |
| 2000 | 33.2°C | 24.7°C | 16.1°C | 39.7°C | 10.9°C | 2 mm | 43% | 1.9 m/s | 8.3 |
| 1999 | 32.3°C | 24.5°C | 16.8°C | 36.4°C | 12.1°C | 17 mm | 44% | 1.8 m/s | 7.9 |
| 1998 | 32.6°C | 25.0°C | 17.3°C | 41.1°C | 11.6°C | 2 mm | 50% | 1.7 m/s | 8.4 |
| 1997 | 32.4°C | 24.1°C | 15.7°C | 39.0°C | 11.5°C | 4 mm | 46% | 1.9 m/s | 8.2 |
| 1996 | 35.0°C | 27.0°C | 19.0°C | 39.6°C | 13.8°C | 2 mm | 40% | 1.9 m/s | 8 |
| 1995 | 33.7°C | 25.5°C | 17.3°C | 43.0°C | 12.0°C | 3 mm | 43% | 1.7 m/s | 7.4 |
| 1994 | 33.1°C | 25.0°C | 16.9°C | 37.9°C | 12.8°C | 0 mm | 45% | 1.8 m/s | 7.3 |
| 1993 ❄️ | 29.8°C | 21.8°C | 13.8°C | 37.3°C | 11.9°C | 0 mm | 58% | 1.8 m/s | 7.8 |
| 1992 | 32.8°C | 25.0°C | 17.3°C | 40.1°C | 11.4°C | 10 mm | 50% | 1.9 m/s | 7.1 |
| 1991 | 31.6°C | 23.5°C | 15.4°C | 37.4°C | 11.5°C | 9 mm | 50% | 1.7 m/s | 7.4 |
| 1990 | 34.8°C | 26.4°C | 18.1°C | 38.1°C | 12.4°C | 4 mm | 39% | 1.9 m/s | 7.4 |
| 1989 | 35.6°C | 26.8°C | 18.0°C | 43.0°C | 14.3°C | 1 mm | 35% | 1.9 m/s | 7.9 |
| 1988 | 34.8°C | 26.3°C | 17.7°C | 39.3°C | 12.5°C | 1 mm | 43% | 1.9 m/s | 6.7 |
| 1987 | 31.4°C | 22.8°C | 14.1°C | 38.0°C | 10.7°C | 3 mm | 44% | 2 m/s | 7.4 |
| 1986 | 32.5°C | 24.1°C | 15.8°C | 37.3°C | 12.1°C | 5 mm | 39% | 2 m/s | 7.7 |
| 1985 | 36.1°C | 27.5°C | 19.0°C | 42.6°C | 13.6°C | 9 mm | 33% | 1.9 m/s | 7.3 |
| 1984 | 35.2°C | 27.6°C | 20.0°C | 38.7°C | 15.3°C | 27 mm | 41% | 1.7 m/s | 6.6 |
| 1983 | 32.3°C | 23.8°C | 15.2°C | 39.4°C | 10.8°C | 0 mm | 40% | 1.8 m/s | — |
| 1982 | 32.9°C | 24.6°C | 16.3°C | 38.0°C | 10.2°C | 6 mm | 39% | 1.7 m/s | — |
| 1981 | 35.3°C | 26.7°C | 18.1°C | 38.5°C | 14.5°C | 1 mm | 29% | 1.9 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 33.8°C with lows near 17.5°C (mean 25.7°C), based on 45 years of NASA POWER data.
July averages 5 mm of rainfall in San Bernardino, one of the drier months. The wettest on record was 32 mm in 2015.
The hottest July reached 44.5°C in 2018. The coldest dipped to 10.2°C in 1982.
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 34.4°C to 34.5°C and overnight lows from 17.7°C to 18.5°C over the same span.
July is one of the warmer months of the year in San Bernardino and one of the drier months, so plan for around 33.8°C daytime highs and 17.5°C at night.
Not quite — July is the 11th coolest month in San Bernardino, averaging 25.7°C.
For July in San Bernardino, pack light, breathable clothing and sun protection, with typical highs of 33.8°C and lows of 17.5°C.
Relative humidity in July averages 41% — relatively dry.
Average wind speed in July is 1.8 m/s. The windiest July on record averaged 2 m/s (1986).
The wettest July on record was 2015 with 32 mm. On average, July sees 5 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 Bernardino 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.
