Weather on June 18
Simi Valley, CA
55 Years of Data
Avg High
83°F
Avg Low
58°F
Warmest
2017
82°F avg
Coldest
2003
62°F avg
About This Date
June 18th in Simi Valley, CA typically brings warm summer weather, with average highs around 83°F and lows near 58°F — a 25°F daily swing. Over 30 years of records, the warmest June 18th was in 2017 (82°F average), while the coldest was 2003 (62°F) — a 20°F range across recorded history. This date has historically been dry, with little recorded precipitation. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for June 18th in Simi Valley, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 97° | 64° | 80° | — | — |
| 2024 | 81° | 55° | 68° | — | — |
| 2023 | 77° | 56° | 66° | — | — |
| 2022 | 77° | 53° | 65° | — | — |
| 2021 | 95° | 63° | 79° | — | — |
| 2020 | 77° | 56° | 66° | — | — |
| 2019 | 81° | 56° | 68° | — | — |
| 2018 | 76° | 52° | 64° | — | — |
| 2017warmest | 99° | 66° | 82° | — | — |
| 2016 | 91° | 67° | 79° | — | — |
| 2015 | 96° | 62° | 79° | — | — |
| 2014 | 83° | 52° | 67° | — | — |
| 2013 | 82° | 59° | 71° | — | — |
| 2012 | 70° | 55° | 62° | — | — |
| 2011 | 70° | 54° | 62° | — | — |
| 2010 | 72° | 54° | 63° | — | — |
| 2009 | 77° | 57° | 67° | — | — |
| 2008 | 97° | 63° | 80° | — | — |
| 2007 | 77° | 52° | 64° | — | — |
| 2006 | 79° | 57° | 68° | — | — |
| 2005 | 72° | 52° | 62° | — | — |
| 2004 | 73° | 57° | 65° | — | — |
| 2003coldest | 70° | 55° | 62° | — | — |
| 2002 | 81° | 59° | 70° | — | — |
| 2001 | 97° | 64° | 80° | — | — |
| 2000 | 82° | 57° | 70° | — | — |
| 1999 | 89° | 57° | 73° | — | — |
| 1998 | 87° | 56° | 71° | — | — |
| 1997 | 92° | 61° | 76° | — | — |
| 1996 | 93° | 64° | 79° | — | — |
30 years of data from SIMI VALLEY CALIFORNIA