Weather on May 31
Simi Valley, CA
55 Years of Data
About This Date
May 31st in Simi Valley, CA typically brings warm spring weather, with average highs around 80°F and lows near 54°F — a 26°F daily swing. Over 31 years of records, the warmest May 31st was in 2025 (80°F average), while the coldest was 2008 (57°F) — a 23°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 May 31st in Simi Valley, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 85° | 60° | 72° | — | — |
| 2025warmest | 100° | 61° | 80° | — | — |
| 2024 | 80° | 52° | 66° | — | — |
| 2023 | 66° | 51° | 59° | — | — |
| 2022 | 83° | 55° | 69° | — | — |
| 2021 | 85° | 53° | 69° | — | — |
| 2020 | 84° | 51° | 68° | — | — |
| 2019 | 80° | 52° | 66° | — | — |
| 2018 | 71° | 55° | 63° | — | — |
| 2017 | 77° | 54° | 65° | — | — |
| 2016 | 83° | 53° | 68° | — | — |
| 2015 | 82° | 55° | 69° | — | — |
| 2014 | 87° | 58° | 72° | — | — |
| 2013 | 82° | 58° | 70° | — | — |
| 2012 | 81° | 54° | 67° | — | — |
| 2011 | 72° | 46° | 59° | — | — |
| 2010 | 78° | 55° | 67° | — | — |
| 2009 | 71° | 56° | 63° | — | — |
| 2008coldest | 68° | 46° | 57° | — | — |
| 2007 | 68° | 48° | 58° | — | — |
| 2006 | 82° | 59° | 71° | — | — |
| 2005 | 73° | 54° | 63° | — | — |
| 2004 | 82° | 61° | 71° | — | — |
| 2003 | 75° | 52° | 63° | — | — |
| 2002 | 84° | 55° | 70° | — | — |
| 2001 | 95° | 57° | 76° | — | — |
| 2000 | 81° | 56° | 68° | — | — |
| 1999 | 77° | 48° | 63° | — | — |
| 1998 | 79° | 51° | 65° | — | — |
| 1997 | 88° | 60° | 74° | — | — |
| 1996 | 83° | 52° | 67° | — | — |
Simi Valley, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Simi Valley, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Simi Valley, CA
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