May is close to Chula Vista's year-round average, with average highs near 23°C and lows around 11.9°C (mean 17.5°C). It is one of the drier months, averaging 6 mm of rainfall and 67% relative humidity across the period.
May is close to Chula Vista's year-round average. Across 45 years of records, the warmest May in Chula Vista was 1997 — when the month averaged 21°C — while the coldest was 1998 at 14.7°C. Typical May days reach 23°C with nights near 11.9°C. The long-term trend is cooling, about 0.2°C per decade.
May is one of the drier months in Chula Vista, averaging 6 mm of rainfall. The wettest May on record was 2015 with 45 mm, while the driest were 1984, 2004 and 2010 at 0 mm.
Relative humidity in Chula Vista during May averages 67%. The most humid May was 1998 at 78%, and the least humid was 1984 at 51%.
May receives about 6.1 kWh/m²/day of solar energy in Chula Vista. The sunniest Mays were 1996, 2010 and 2020 at 7.1 kWh/m²/day, and the cloudiest was 2001 at 4.8.
Average wind speed in Chula Vista during May is 2.5 m/s. The windiest May was 1998 at 3 m/s, while the calmest was 2009 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.0°C | 17.0°C | 17.9°C | 17.0°C | 17.2°C | -0.8°C |
| Avg High | 23.9°C | 22.3°C | 23.7°C | 22.3°C | 22.6°C | -1.3°C |
| Avg Low | 12.1°C | 11.7°C | 12.1°C | 11.8°C | 11.8°C | -0.3°C |
| Avg Rain | 3 mm | 6 mm | 3 mm | 12 mm | 3 mm | +0 mm |
May temperatures in Chula Vista have fallen by about 1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 6.5°C (1999) to a record high of 36.5°C (1984).
Rainfall in May is one of the drier months, averaging 6 mm, with a wettest year of 45 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.3°C per decade while lows rose 0°C per decade, narrowing the gap between day and night.
A good time to visit Chula Vista
May is a good time to visit Chula Vista, with days averaging 23°C and nights around 11.9°C (mean 17.5°C, close to Chula Vista's yearly average) and low rainfall. July and September are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 23.3°C | 17.9°C | 12.5°C | 32.5°C | 9.9°C | 7 mm | 69% | 2.4 m/s | 5.7 |
| 2024 | 21.0°C | 16.0°C | 10.9°C | 25.2°C | 9.7°C | 3 mm | 75% | 2.3 m/s | 5.5 |
| 2023 | 20.3°C | 15.8°C | 11.3°C | 26.4°C | 8.7°C | 6 mm | 77% | 2.7 m/s | 5.2 |
| 2022 | 23.3°C | 17.3°C | 11.3°C | 30.8°C | 7.4°C | 0 mm | 65% | 2.4 m/s | 6.1 |
| 2021 | 23.0°C | 17.1°C | 11.1°C | 30.4°C | 9.0°C | 1 mm | 67% | 2.4 m/s | 5.9 |
| 2020 | 24.5°C | 19.0°C | 13.5°C | 30.4°C | 11.5°C | 2 mm | 69% | 2.3 m/s | 7.1 |
| 2019 | 19.7°C | 15.6°C | 11.5°C | 24.9°C | 9.5°C | 30 mm | 78% | 2.9 m/s | 6 |
| 2018 | 22.0°C | 16.9°C | 11.9°C | 31.0°C | 9.3°C | 2 mm | 69% | 2.7 m/s | 5.7 |
| 2017 | 22.6°C | 17.4°C | 12.1°C | 30.6°C | 8.4°C | 18 mm | 69% | 2.5 m/s | 6 |
| 2016 | 21.6°C | 16.7°C | 11.9°C | 27.7°C | 9.9°C | 10 mm | 74% | 2.6 m/s | 5.8 |
| 2015 🌧️ | 21.3°C | 16.6°C | 11.9°C | 31.0°C | 10.1°C | 45 mm | 73% | 2.8 m/s | 5.8 |
| 2014 | 25.4°C | 19.6°C | 13.7°C | 35.3°C | 10.6°C | 0 mm | 56% | 2.7 m/s | 6.9 |
| 2013 | 24.0°C | 18.4°C | 12.8°C | 33.2°C | 10.7°C | 8 mm | 65% | 2.6 m/s | 6.4 |
| 2012 | 23.5°C | 17.3°C | 11.1°C | 30.6°C | 9.1°C | 0 mm | 67% | 2.2 m/s | 6.2 |
| 2011 | 21.2°C | 15.9°C | 10.6°C | 29.7°C | 7.9°C | 10 mm | 68% | 2.8 m/s | 6.7 |
| 2010 | 21.2°C | 15.7°C | 10.2°C | 26.9°C | 7.5°C | 0 mm | 70% | 2.5 m/s | 7.1 |
| 2009 | 24.7°C | 18.4°C | 12.2°C | 30.2°C | 9.2°C | 0 mm | 66% | 1.9 m/s | 5.5 |
| 2008 | 22.5°C | 17.1°C | 11.8°C | 33.5°C | 9.1°C | 3 mm | 63% | 2.6 m/s | 6.5 |
| 2007 | 23.4°C | 17.3°C | 11.2°C | 30.8°C | 9.2°C | 0 mm | 64% | 2.3 m/s | 5.6 |
| 2006 | 24.0°C | 18.1°C | 12.1°C | 29.9°C | 10.2°C | 10 mm | 69% | 2.2 m/s | 5.3 |
| 2005 | 23.3°C | 18.1°C | 12.8°C | 30.4°C | 10.2°C | 2 mm | 70% | 2.3 m/s | 6.5 |
| 2004 | 24.5°C | 18.9°C | 13.4°C | 34.6°C | 10.6°C | 0 mm | 60% | 2.5 m/s | 6.9 |
| 2003 | 22.2°C | 16.9°C | 11.5°C | 33.0°C | 8.1°C | 9 mm | 71% | 2.3 m/s | 5.8 |
| 2002 | 22.6°C | 16.5°C | 10.4°C | 30.8°C | 8.2°C | 1 mm | 67% | 2.5 m/s | 6.1 |
| 2001 | 25.7°C | 19.3°C | 12.9°C | 31.8°C | 9.2°C | 1 mm | 64% | 2.1 m/s | 4.8 |
| 2000 | 24.4°C | 18.7°C | 13.1°C | 32.2°C | 10.5°C | 1 mm | 65% | 2.3 m/s | 6 |
| 1999 | 21.1°C | 15.5°C | 10.0°C | 27.1°C | 6.5°C | 0 mm | 70% | 2.5 m/s | 6.1 |
| 1998 ❄️ | 18.5°C | 14.7°C | 10.9°C | 23.1°C | 8.9°C | 30 mm | 78% | 3 m/s | 6.9 |
| 1997 🔥 | 27.5°C | 21.0°C | 14.6°C | 31.4°C | 11.4°C | 0 mm | 61% | 2 m/s | 6.4 |
| 1996 | 23.6°C | 18.0°C | 12.5°C | 31.8°C | 10.2°C | 1 mm | 67% | 2.5 m/s | 7.1 |
| 1995 | 19.1°C | 15.0°C | 10.8°C | 27.9°C | 9.0°C | 15 mm | 76% | 2.8 m/s | 5.6 |
| 1994 | 21.9°C | 16.4°C | 10.9°C | 27.3°C | 9.1°C | 3 mm | 72% | 2.5 m/s | 5.4 |
| 1993 | 23.5°C | 18.1°C | 12.7°C | 29.4°C | 9.9°C | 3 mm | 71% | 2.6 m/s | 6.8 |
| 1992 | 24.8°C | 19.0°C | 13.3°C | 28.9°C | 11.8°C | 3 mm | 73% | 2.3 m/s | 5.6 |
| 1991 | 20.8°C | 15.4°C | 9.9°C | 28.4°C | 7.6°C | 1 mm | 69% | 2.8 m/s | 6.5 |
| 1990 | 22.0°C | 16.7°C | 11.4°C | 32.6°C | 9.3°C | 8 mm | 68% | 2.7 m/s | 6.6 |
| 1989 | 23.5°C | 17.8°C | 12.1°C | 30.4°C | 10.4°C | 4 mm | 63% | 2.6 m/s | 6.2 |
| 1988 | 23.9°C | 18.0°C | 12.1°C | 31.8°C | 7.6°C | 4 mm | 60% | 2.5 m/s | 6.9 |
| 1987 | 24.8°C | 19.2°C | 13.7°C | 32.4°C | 10.6°C | 3 mm | 58% | 2.4 m/s | 6 |
| 1986 | 24.0°C | 18.0°C | 11.9°C | 31.6°C | 8.7°C | 1 mm | 61% | 2.3 m/s | 6 |
| 1985 | 22.4°C | 16.7°C | 11.1°C | 28.9°C | 9.0°C | 2 mm | 65% | 2.4 m/s | 5.8 |
| 1984 | 27.9°C | 20.8°C | 13.6°C | 36.5°C | 9.5°C | 0 mm | 51% | 2 m/s | 6.3 |
| 1983 | 23.0°C | 17.4°C | 11.7°C | 30.8°C | 8.5°C | 1 mm | 68% | 2.3 m/s | — |
| 1982 | 22.3°C | 16.6°C | 10.9°C | 28.1°C | 9.0°C | 4 mm | 69% | 2.5 m/s | — |
| 1981 | 23.5°C | 17.5°C | 11.5°C | 31.0°C | 8.9°C | 5 mm | 63% | 2.3 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 23°C with lows near 11.9°C (mean 17.5°C), based on 45 years of NASA POWER data.
May averages 6 mm of rainfall in Chula Vista, one of the drier months. The wettest on record was 45 mm in 2015.
The hottest May reached 36.5°C in 1984. The coldest dipped to 6.5°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have fallen by about 1°C. Daytime highs moved from 23.8°C to 22.2°C and overnight lows from 11.8°C to 11.4°C over the same span.
May is close to Chula Vista's year-round average and one of the drier months, so plan for around 23°C daytime highs and 11.9°C at night.
Not quite — May is the 7th coolest month in Chula Vista, averaging 17.5°C.
For May in Chula Vista, pack light layers you can adjust through the day, with typical highs of 23°C and lows of 11.9°C.
Relative humidity in May averages 67% — moderately humid.
Average wind speed in May is 2.5 m/s. The windiest May on record averaged 3 m/s (1998).
The wettest May on record was 2015 with 45 mm. On average, May 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 Chula Vista behaves each May, 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 May specifically, along with year-by-year records and how the month has changed over the decades.
