Simi Valley in Spring
In spring (March, April and May), Simi Valley sees average daytime highs around 70°F and overnight lows near 51°F, with 3.9 in of rain over about 10 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Over the season highs climb from about 65°F in early March to 74°F by late May. The sky is clear or mostly clear about 58% of the time across spring, and the air most often feels dry.
Spring is Simi Valley's 3rd-best season to visit on our travel score. For the whole year in context, see Simi Valley's year-round climate.
- Avg daytime high
- 70°F
- 3rd-warmest season
- Avg overnight low
- 51°F
- Rainfall
- 3.9 in
- 10 wet days
- Avg wind
- 4 mph
- Travel score
- 7.9
- 3rd-best season
- Months
- Mar · Apr · May
Temperature in Simi Valley in Spring
Over the season highs climb from about 65°F in early March to 74°F by late May.
A typical spring day in Simi Valley reaches about 70°F and drops to 51°F overnight. The warmest of the three months is May, the coolest March.
Simi Valley weather by month
How the three spring months (March, April and May) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 63° / 45° | 3.6 | 5.6 | 10 | 6.4 |
| Feb | 64° / 45° | 3.8 | 6.4 | 10.7 | 6.4 |
| Mar | 66° / 47° | 2.6 | 5.6 | 11.7 | 7.0 |
| Apr | 70° / 50° | 0.9 | 2.9 | 12.8 | 8.0 |
| May | 73° / 55° | 0.5 | 1.8 | 13.8 | 8.7 |
| Jun | 78° / 59° | 0.1 | 0.5 | 14.2 | 9.1 |
| Jul | 83° / 64° | 0.1 | 0.5 | 14.1 | 8.1 |
| Aug | 85° / 65° | 0.0 | 0.1 | 13.3 | 7.4 |
| Sep | 83° / 62° | 0.2 | 0.6 | 12.2 | 8.2 |
| Oct | 77° / 56° | 0.8 | 2.1 | 11.1 | 8.8 |
| Nov | 70° / 49° | 0.8 | 2.6 | 10.2 | 8.1 |
| Dec | 63° / 44° | 2.3 | 4.8 | 9.8 | 6.6 |
Cloud cover in Spring
The sky is clear or mostly clear about 58% of the time across spring.
Chance of precipitation in Spring
Simi Valley gets around 3.9 in of rain over 10 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 4 mph across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 12 min in early March to 14 h 06 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 6.6 kWh/m².
Is spring a good time to visit Simi Valley?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is one of the better times to visit Simi Valley for general sightseeing.
What to pack for Simi Valley in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, Simi Valley sees daytime highs around 70°F and nights near 51°F. Pack sun protection. Worth having: light clothes. About 10 days see rain.
Sea temperature near Simi Valley in Spring
The nearest coast averages about 59°F across spring — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 22 mi away) is warmest in August at about 67°F and coldest in March near 58°F.
The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 58 | 58 | 58 | 58 | 60 | 63 | 66 | 67 | 67 | 65 | 62 | 60 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Cool |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 58 | Bracing |
| Feb | 58 | Bracing |
| Mar | 58 | Bracing |
| Apr | 58 | Bracing |
| May | 60 | Cool |
| Jun | 63 | Cool |
| Jul | 66 | Cool |
| Aug | 67 | Cool |
| Sep | 67 | Cool |
| Oct | 65 | Cool |
| Nov | 62 | Cool |
| Dec | 60 | Cool |
UV index in Simi Valley in Spring
Clear-sky midday UV across spring averages around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Simi Valley peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 5 | 5 | 8 | 8 | 11 | 11 | 11 | 8 | 6 | 3 | 3 |
| Level | Moderate | Moderate | Moderate | Very high | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 5 | Moderate |
| Mar | 5 | Moderate |
| Apr | 8 | Very high |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 3 | Moderate |
Air quality in Simi Valley in Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring falls, not just the annual average.
Air quality in Simi Valley is worst in December — around 29 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (May, 12 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 18 | 17 | 17 | 15 | 12 | 14 | 25 | 26 | 24 | 18 | 23 | 29 |
| Level | Moderate | Moderate | Moderate | Moderate | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 18 | Moderate |
| Feb | 17 | Moderate |
| Mar | 17 | Moderate |
| Apr | 15 | Moderate |
| May | 12 | Good |
| Jun | 14 | Moderate |
| Jul | 25 | Moderate |
| Aug | 26 | Moderate |
| Sep | 24 | Moderate |
| Oct | 18 | Moderate |
| Nov | 23 | Moderate |
| Dec | 29 | Moderate |
Where is Simi Valley?
Simi Valley sits at 34.3°N, 118.8°W, 768 ft above sea level, in United States. The nearest listed city is Moorpark, 5.6 mi away.
Topography around Simi Valley
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Simi Valley.
Within 2 miles, the terrain around Simi Valley has only modest variations in elevation — a maximum elevation change of 656 ft around an average of 886 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,028 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 8,816 ft.
The land around Simi Valley is covered by artificial surfaces (56%) within 2 miles, grassland (39%) and shrubs (21%) within 10 miles, and water (30%) and grassland (23%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Simi Valley (34.2694°, -118.7815°, elevation 768 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.