August is one of the warmer months of the year in Chula Vista, with average highs near 30.4°C and lows around 18°C (mean 24.2°C). It is one of the drier months, averaging 7 mm of rainfall and 56% relative humidity across the period.
August is one of the warmer months of the year in Chula Vista. Across 45 years of records, the warmest August in Chula Vista was 1998 — when the month averaged 26°C — while the coldest was 1989 at 22.1°C. Typical August days reach 30.4°C with nights near 18°C. The long-term August temperature trend is broadly flat.
August is one of the drier months in Chula Vista, averaging 7 mm of rainfall. The wettest August on record was 2023 with 47 mm, while the driest was 2002 at 0 mm.
Relative humidity in Chula Vista during August averages 56%. The most humid August was 1989 at 62%, and the least humid was 1986 at 44%.
August receives about 6.1 kWh/m²/day of solar energy in Chula Vista. The sunniest Augusts were 2006 and 2024 at 6.6 kWh/m²/day, and the cloudiest was 1991 at 5.4.
Average wind speed in Chula Vista during August is 2 m/s. The windiest August was 2023 at 2.3 m/s, while the calmest was 1986 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.2°C | 24.4°C | 23.9°C | 24.0°C | 24.7°C | +0.5°C |
| Avg High | 30.4°C | 30.6°C | 30.1°C | 30.3°C | 31.0°C | +0.6°C |
| Avg Low | 18.0°C | 18.3°C | 17.7°C | 17.7°C | 18.4°C | +0.4°C |
| Avg Rain | 10 mm | 4 mm | 4 mm | 5 mm | 13 mm | +3 mm |
August temperatures in Chula Vista have stayed relatively stable across the record.
August has ranged from a record low of 10.8°C (2010) to a record high of 40°C (1985).
Rainfall in August is one of the drier months, averaging 7 mm, with a wettest year of 47 mm.
A good time to visit Chula Vista
August is a good time to visit Chula Vista, with days averaging 30.4°C and nights around 18°C (mean 24.2°C, warmer than Chula Vista's yearly average) and low rainfall. July and September are marginally more temperate, but August still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 30.7°C | 24.2°C | 17.7°C | 34.4°C | 13.2°C | 12 mm | 53% | 1.9 m/s | 6 |
| 2024 | 31.1°C | 24.6°C | 18.1°C | 35.6°C | 14.3°C | 4 mm | 54% | 2 m/s | 6.6 |
| 2023 🌧️ | 30.5°C | 24.4°C | 18.2°C | 34.7°C | 14.2°C | 47 mm | 57% | 2.3 m/s | 6 |
| 2022 | 32.1°C | 25.8°C | 19.5°C | 37.8°C | 16.7°C | 7 mm | 54% | 2.1 m/s | 6.3 |
| 2021 | 30.6°C | 24.4°C | 18.2°C | 34.4°C | 14.3°C | 5 mm | 56% | 2.1 m/s | 6 |
| 2020 | 31.0°C | 24.8°C | 18.6°C | 37.8°C | 13.5°C | 0 mm | 55% | 2 m/s | 6.2 |
| 2019 | 30.8°C | 24.0°C | 17.2°C | 34.6°C | 13.3°C | 1 mm | 49% | 1.9 m/s | 6.1 |
| 2018 | 31.3°C | 25.1°C | 19.0°C | 36.1°C | 15.1°C | 5 mm | 60% | 2.1 m/s | 6.4 |
| 2017 | 30.7°C | 24.3°C | 17.8°C | 36.4°C | 13.7°C | 8 mm | 56% | 1.9 m/s | 5.6 |
| 2016 | 30.9°C | 24.1°C | 17.3°C | 36.5°C | 13.6°C | 1 mm | 58% | 2.2 m/s | 6.3 |
| 2015 | 30.5°C | 24.4°C | 18.3°C | 35.8°C | 14.3°C | 3 mm | 59% | 2.1 m/s | 6.3 |
| 2014 | 30.1°C | 23.9°C | 17.8°C | 35.1°C | 14.4°C | 11 mm | 61% | 2.1 m/s | 6.4 |
| 2013 | 29.0°C | 23.1°C | 17.1°C | 33.0°C | 12.6°C | 11 mm | 58% | 1.8 m/s | 5.7 |
| 2012 | 31.7°C | 25.7°C | 19.7°C | 35.2°C | 14.4°C | 4 mm | 56% | 1.9 m/s | 6.1 |
| 2011 | 29.7°C | 23.1°C | 16.5°C | 35.2°C | 12.7°C | 2 mm | 52% | 1.9 m/s | 5.6 |
| 2010 | 28.5°C | 22.3°C | 16.0°C | 35.4°C | 10.8°C | 0 mm | 54% | 1.9 m/s | 6.3 |
| 2009 | 30.1°C | 23.7°C | 17.2°C | 36.4°C | 12.8°C | 1 mm | 54% | 1.9 m/s | 6.1 |
| 2008 | 30.5°C | 24.3°C | 18.0°C | 33.7°C | 13.9°C | 4 mm | 57% | 1.9 m/s | 6.1 |
| 2007 | 30.9°C | 24.7°C | 18.5°C | 35.6°C | 14.8°C | 1 mm | 57% | 2 m/s | 6.4 |
| 2006 | 29.5°C | 23.4°C | 17.3°C | 33.6°C | 13.9°C | 0 mm | 58% | 2.1 m/s | 6.6 |
| 2005 | 30.0°C | 24.1°C | 18.1°C | 35.8°C | 14.4°C | 12 mm | 60% | 1.9 m/s | 5.9 |
| 2004 | 29.3°C | 23.2°C | 17.0°C | 33.9°C | 13.5°C | 1 mm | 60% | 2 m/s | 6.1 |
| 2003 | 30.8°C | 24.8°C | 18.7°C | 33.9°C | 15.9°C | 11 mm | 56% | 2 m/s | 6.5 |
| 2002 | 29.0°C | 22.5°C | 16.1°C | 36.9°C | 13.3°C | 0 mm | 58% | 2.1 m/s | 5.5 |
| 2001 | 30.2°C | 23.8°C | 17.4°C | 34.3°C | 14.0°C | 1 mm | 56% | 2 m/s | 5.5 |
| 2000 | 30.3°C | 24.5°C | 18.7°C | 34.2°C | 14.7°C | 7 mm | 56% | 2 m/s | 6.3 |
| 1999 | 29.5°C | 23.4°C | 17.3°C | 34.8°C | 12.6°C | 2 mm | 52% | 2.1 m/s | 6.1 |
| 1998 🔥 | 32.0°C | 26.0°C | 20.0°C | 37.0°C | 15.8°C | 6 mm | 53% | 1.9 m/s | 6.2 |
| 1997 | 30.7°C | 24.6°C | 18.4°C | 37.6°C | 15.0°C | 1 mm | 60% | 2.2 m/s | 6.4 |
| 1996 | 31.9°C | 25.4°C | 18.9°C | 36.9°C | 12.7°C | 1 mm | 53% | 2 m/s | 6.2 |
| 1995 | 32.2°C | 25.7°C | 19.3°C | 35.9°C | 15.7°C | 2 mm | 50% | 2 m/s | 6.4 |
| 1994 | 31.6°C | 25.5°C | 19.4°C | 36.8°C | 14.2°C | 7 mm | 54% | 1.9 m/s | 6.1 |
| 1993 | 28.9°C | 23.0°C | 17.1°C | 34.9°C | 13.3°C | 4 mm | 57% | 1.9 m/s | 5.5 |
| 1992 | 31.1°C | 25.3°C | 19.6°C | 34.8°C | 14.2°C | 13 mm | 58% | 1.9 m/s | 6.4 |
| 1991 | 28.3°C | 22.3°C | 16.3°C | 33.3°C | 12.4°C | 4 mm | 61% | 2 m/s | 5.4 |
| 1990 | 29.4°C | 23.1°C | 16.7°C | 34.8°C | 13.4°C | 4 mm | 60% | 2 m/s | 5.6 |
| 1989 ❄️ | 28.2°C | 22.1°C | 16.0°C | 32.1°C | 13.0°C | 2 mm | 62% | 2.1 m/s | 6.2 |
| 1988 | 29.3°C | 23.0°C | 16.6°C | 33.0°C | 13.0°C | 10 mm | 62% | 2.1 m/s | 6 |
| 1987 | 29.2°C | 22.8°C | 16.4°C | 33.9°C | 11.7°C | 6 mm | 59% | 2.1 m/s | 6 |
| 1986 | 31.9°C | 25.7°C | 19.4°C | 35.0°C | 15.5°C | 4 mm | 44% | 1.7 m/s | 6.1 |
| 1985 | 30.4°C | 23.8°C | 17.2°C | 40.0°C | 13.0°C | 1 mm | 50% | 1.9 m/s | 6.1 |
| 1984 | 31.1°C | 25.0°C | 18.8°C | 34.6°C | 15.9°C | 19 mm | 60% | 1.9 m/s | 5.7 |
| 1983 | 30.6°C | 25.0°C | 19.4°C | 35.1°C | 14.2°C | 36 mm | 60% | 1.8 m/s | — |
| 1982 | 31.0°C | 25.0°C | 19.0°C | 35.0°C | 14.4°C | 10 mm | 50% | 1.8 m/s | — |
| 1981 | 32.2°C | 25.6°C | 19.0°C | 37.8°C | 13.7°C | 3 mm | 45% | 2 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 30.4°C with lows near 18°C (mean 24.2°C), based on 45 years of NASA POWER data.
August averages 7 mm of rainfall in Chula Vista, one of the drier months. The wettest on record was 47 mm in 2023.
The hottest August reached 40°C in 1985. The coldest dipped to 10.8°C in 2010.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have fallen by about 0.2°C. Daytime highs moved from 31.1°C to 31°C and overnight lows from 18.7°C to 18.3°C over the same span.
August is one of the warmer months of the year in Chula Vista and one of the drier months, so plan for around 30.4°C daytime highs and 18°C at night.
Not quite — August is the 12th coolest month in Chula Vista, averaging 24.2°C.
For August in Chula Vista, pack light, breathable clothing and sun protection, with typical highs of 30.4°C and lows of 18°C.
Relative humidity in August averages 56% — moderately humid.
Average wind speed in August is 2 m/s. The windiest August on record averaged 2.3 m/s (2023).
The wettest August on record was 2023 with 47 mm. On average, August sees 7 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 Chula Vista behaves each August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
