June is one of the warmer months of the year in Simi Valley, with average highs near 31.4°C and lows around 13.5°C (mean 22.5°C). It is one of the drier months, averaging 2 mm of rainfall and 40% relative humidity across the period.
June is one of the warmer months of the year in Simi Valley. Across 45 years of records, the warmest June in Simi Valley was 2016 — when the month averaged 25.4°C — while the coldest was 1998 at 18.1°C. Typical June days reach 31.4°C with nights near 13.5°C. The long-term trend is warming, about 0.3°C per decade.
June is one of the drier months in Simi Valley, averaging 2 mm of rainfall. The wettest June on record was 1993 with 20 mm, while the driest were 2014, 2024 and 2025, among others at 0 mm.
Relative humidity in Simi Valley during June averages 40%. The most humid June was 2023 at 65%, and the least humid was 1981 at 23%.
June receives about 8 kWh/m²/day of solar energy in Simi Valley. The sunniest Junes were 2008 and 2014 at 8.6 kWh/m²/day, and the cloudiest was 1988 at 6.9.
Average wind speed in Simi Valley during June is 2.1 m/s. The windiest June was 1981 at 3.1 m/s, while the calmest was 2019 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.5°C | 21.4°C | 22.7°C | 22.9°C | 23.0°C | +0.5°C |
| Avg High | 31.5°C | 30.2°C | 31.6°C | 32.1°C | 31.7°C | +0.2°C |
| Avg Low | 13.4°C | 12.6°C | 13.7°C | 13.8°C | 14.3°C | +0.9°C |
| Avg Rain | 1 mm | 4 mm | 1 mm | 1 mm | 1 mm | 0 mm |
June temperatures in Simi Valley have risen by about 0.8°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 4.4°C (1999) to a record high of 42.7°C (2016).
Rainfall in June is one of the drier months, averaging 2 mm, with a wettest year of 20 mm.
One of the best times to visit Simi Valley
June is one of the best times to visit Simi Valley. Expect days averaging 31.4°C and nights around 13.5°C (mean 22.5°C) — warmer than Simi Valley'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 | 33.0°C | 23.9°C | 14.8°C | 38.5°C | 10.3°C | 0 mm | 36% | 2 m/s | 8.2 |
| 2024 | 32.0°C | 23.3°C | 14.7°C | 36.7°C | 10.1°C | 0 mm | 47% | 1.9 m/s | 8.1 |
| 2023 | 26.1°C | 18.8°C | 11.5°C | 36.2°C | 8.3°C | 3 mm | 65% | 1.8 m/s | 7.1 |
| 2022 | 34.0°C | 24.9°C | 15.9°C | 38.9°C | 8.8°C | 2 mm | 31% | 2.1 m/s | 8.4 |
| 2021 | 34.6°C | 25.3°C | 16.0°C | 42.1°C | 8.1°C | 0 mm | 34% | 2.2 m/s | 8.2 |
| 2020 | 30.7°C | 21.9°C | 13.1°C | 36.4°C | 7.6°C | 1 mm | 44% | 2.2 m/s | 8 |
| 2019 | 30.2°C | 21.9°C | 13.5°C | 35.5°C | 9.3°C | 3 mm | 54% | 1.7 m/s | 7.7 |
| 2018 | 32.5°C | 23.0°C | 13.5°C | 38.5°C | 8.0°C | 0 mm | 38% | 2 m/s | 8.3 |
| 2017 | 33.5°C | 24.4°C | 15.2°C | 40.4°C | 5.6°C | 0 mm | 39% | 2 m/s | 8.3 |
| 2016 🔥 | 34.6°C | 25.4°C | 16.2°C | 42.7°C | 9.5°C | 0 mm | 30% | 2.1 m/s | 8 |
| 2015 | 33.7°C | 24.8°C | 15.9°C | 38.8°C | 10.3°C | 3 mm | 34% | 1.9 m/s | 7.7 |
| 2014 | 32.8°C | 23.2°C | 13.6°C | 38.1°C | 10.0°C | 0 mm | 32% | 2.1 m/s | 8.6 |
| 2013 | 32.9°C | 23.4°C | 13.9°C | 42.6°C | 9.1°C | 0 mm | 37% | 2.2 m/s | 8 |
| 2012 | 31.9°C | 22.1°C | 12.4°C | 36.3°C | 7.2°C | 0 mm | 32% | 2.3 m/s | 8.5 |
| 2011 | 28.4°C | 19.7°C | 11.1°C | 34.6°C | 5.3°C | 3 mm | 53% | 1.9 m/s | 8 |
| 2010 | 30.6°C | 21.5°C | 12.5°C | 35.0°C | 8.7°C | 0 mm | 46% | 2.1 m/s | 8.3 |
| 2009 | 28.1°C | 20.4°C | 12.8°C | 37.6°C | 9.4°C | 3 mm | 49% | 1.9 m/s | 7.1 |
| 2008 | 33.8°C | 24.3°C | 14.8°C | 40.9°C | 8.4°C | 0 mm | 27% | 2.4 m/s | 8.6 |
| 2007 | 32.4°C | 23.2°C | 14.0°C | 37.3°C | 7.9°C | 0 mm | 31% | 2 m/s | 8.4 |
| 2006 | 32.8°C | 24.2°C | 15.6°C | 38.9°C | 9.1°C | 0 mm | 44% | 2.1 m/s | 7.9 |
| 2005 | 27.9°C | 19.4°C | 10.9°C | 34.5°C | 5.9°C | 0 mm | 52% | 2 m/s | 8.2 |
| 2004 | 32.1°C | 22.8°C | 13.5°C | 36.8°C | 7.7°C | 0 mm | 37% | 2.1 m/s | 8.1 |
| 2003 | 31.3°C | 22.1°C | 12.9°C | 36.8°C | 9.3°C | 3 mm | 48% | 1.9 m/s | 7.4 |
| 2002 | 32.8°C | 23.1°C | 13.4°C | 39.1°C | 9.1°C | 0 mm | 35% | 2 m/s | 8.4 |
| 2001 | 32.7°C | 23.8°C | 14.9°C | 36.4°C | 8.7°C | 0 mm | 34% | 2.1 m/s | 8.5 |
| 2000 | 32.4°C | 23.5°C | 14.6°C | 39.4°C | 8.4°C | 7 mm | 41% | 2 m/s | 8.1 |
| 1999 | 30.6°C | 21.4°C | 12.2°C | 38.2°C | 4.4°C | 7 mm | 37% | 2 m/s | 8.2 |
| 1998 ❄️ | 25.6°C | 18.1°C | 10.5°C | 33.1°C | 6.2°C | 3 mm | 65% | 1.9 m/s | 7.4 |
| 1997 | 31.0°C | 22.3°C | 13.7°C | 37.0°C | 9.4°C | 1 mm | 41% | 2.2 m/s | 7.9 |
| 1996 | 32.8°C | 23.6°C | 14.3°C | 37.6°C | 7.8°C | 0 mm | 32% | 1.9 m/s | 8.5 |
| 1995 | 27.7°C | 19.4°C | 11.0°C | 35.3°C | 5.1°C | 10 mm | 54% | 2.2 m/s | 7.4 |
| 1994 | 34.1°C | 24.5°C | 14.8°C | 40.9°C | 7.7°C | 0 mm | 29% | 2.1 m/s | 8.2 |
| 1993 🌧️ | 30.3°C | 21.3°C | 12.3°C | 36.9°C | 4.8°C | 20 mm | 45% | 2.3 m/s | 8 |
| 1992 | 28.7°C | 20.4°C | 12.2°C | 33.2°C | 6.9°C | 0 mm | 50% | 2.3 m/s | 7.6 |
| 1991 | 28.4°C | 19.7°C | 10.9°C | 34.5°C | 7.9°C | 1 mm | 46% | 1.9 m/s | 7.7 |
| 1990 | 32.7°C | 23.2°C | 13.8°C | 38.8°C | 6.8°C | 0 mm | 32% | 2.7 m/s | 8.1 |
| 1989 | 31.8°C | 22.5°C | 13.1°C | 38.8°C | 8.1°C | 0 mm | 35% | 2.4 m/s | 7.8 |
| 1988 | 30.1°C | 21.0°C | 11.9°C | 36.7°C | 5.0°C | 2 mm | 39% | 2.3 m/s | 6.9 |
| 1987 | 32.5°C | 23.7°C | 14.9°C | 35.5°C | 9.7°C | 3 mm | 29% | 2.1 m/s | 8 |
| 1986 | 32.4°C | 23.3°C | 14.1°C | 37.2°C | 9.8°C | 0 mm | 33% | 2.1 m/s | 7.9 |
| 1985 | 33.9°C | 24.4°C | 14.9°C | 39.9°C | 6.7°C | 2 mm | 28% | 2.2 m/s | 8 |
| 1984 | 31.7°C | 22.6°C | 13.5°C | 38.3°C | 8.1°C | 2 mm | 28% | 2.4 m/s | 7.1 |
| 1983 | 28.6°C | 20.0°C | 11.3°C | 33.0°C | 7.1°C | 0 mm | 51% | 2 m/s | — |
| 1982 | 28.4°C | 19.7°C | 11.1°C | 32.7°C | 6.0°C | 1 mm | 45% | 2.3 m/s | — |
| 1981 | 34.5°C | 25.2°C | 15.9°C | 38.9°C | 8.9°C | 0 mm | 23% | 3.1 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 31.4°C with lows near 13.5°C (mean 22.5°C), based on 45 years of NASA POWER data.
June averages 2 mm of rainfall in Simi Valley, one of the drier months. The wettest on record was 20 mm in 1993.
The hottest June reached 42.7°C in 2016. The coldest dipped to 4.4°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 0.8°C. Daytime highs moved from 31.4°C to 31.9°C and overnight lows from 13.3°C to 14.6°C over the same span.
June is one of the warmer months of the year in Simi Valley and one of the drier months, so plan for around 31.4°C daytime highs and 13.5°C at night.
Not quite — June is the 9th coolest month in Simi Valley, averaging 22.5°C.
For June in Simi Valley, pack light, breathable clothing and sun protection, with typical highs of 31.4°C and lows of 13.5°C.
Relative humidity in June averages 40% — relatively dry.
Average wind speed in June is 2.1 m/s. The windiest June on record averaged 3.1 m/s (1981).
The wettest June on record was 1993 with 20 mm. On average, June 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 Simi Valley behaves each June, 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 June specifically, along with year-by-year records and how the month has changed over the decades.
