When Can I Be Outside?

Hour-by-hour windows for outdoor time — heat and air quality read together on the NWS and EPA scales, framed for practices, paseos and summer evenings.

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Town Tools builds free, public tools for Santa Clarita and towns around the world. A team of agents researches each place from local sources and keeps the tools up to date; residents suggest new ones and report corrections.

Today, Monday, October 12

Best windows today: all day.

Air in those windows is Moderate, not Good — acceptable for most people by the EPA’s scale, but anyone unusually sensitive to air pollution may want to take it easier.

As of October 12 at 4:52 AM. Modelled forecast for the area around central Santa Clarita, refreshed about every half hour.

Day

Best windows

Peak feels-like

Peak air

Tuesday, October 13

all day

70°F

59 · Moderate

Wednesday, October 14

all day

76°F

58 · Moderate

How this page decides

Heat uses the National Weather Service’s heat-index categories, applied to the modelled feels-like temperature: Caution 80°F–90°F, Extreme Caution 90°F–103°F, Danger 103°F–124°F, Extreme Danger 125°F and up.

Air uses the US EPA air quality index: Good 0–50, Moderate 51–100, Unhealthy for Sensitive Groups 101–150, Unhealthy 151–200, Very Unhealthy 201–300, Hazardous above that. The number here is that same EPA index, computed by Open-Meteo from the Copernicus CAMS model.

Each hour takes the harder of the two constraints, and the strip says which one. A “best window” means hours where the feels-like temperature stays below 80°F (below the NWS Caution band) and the air is no worse than Moderate — the EPA’s general-population activity cautions start at 101. No thresholds on this page are ours.

Reading it for your plans

Kids' practices and camps

Practice times don't move, but the windows do. In summer the morning hours are usually the easiest ones; by mid-afternoon the feels-like temperature is typically the binding constraint. Hart district and league schedules set the when — this page only says how hard that hour will be.

Paseos and trails

The paseo network and the canyon trails are the valley's most-loved outdoor habit, and the least forgiving at midday. Out on an exposed stretch, treat the area-wide number on this page as a floor, not a ceiling — and read the strip against the whole walk or ride, not just the start. The early window usually wins.

Concerts in the Park and summer evenings

The 2026 Concerts in the Park season runs Saturday evenings, July 11 through August 29, at Central Park. Evenings here shed heat slowly — the feels-like number can hold the Caution band well after sunset — so check the strip for the hours you'll actually be on the lawn.

Worth knowing

The valley's heat record

The Santa Clarita station's all-time high is 118°F, set in July 2024. Typical summer afternoons run in the 90s — so the question most days isn't whether it gets hot, but which hours are easier. On the genuinely extreme days, no hour is good, and this page will say so.

Source: Los Angeles Almanac, record temperatures, checked June 12, 2026

Why the worst heat and the worst air often arrive together

Ground-level ozone forms when pollution reacts in sunlight, and the EPA notes it is most likely to reach unhealthy levels on hot sunny days — so the hottest afternoons often carry the harder air too. One honest limit: the air number here is a regional model, and it may not capture the Chiquita Canyon landfill odors that Castaic and Val Verde report. Air Today, linked below, tells both of the valley's smoke stories properly.

Source: US EPA, ground-level ozone basics, checked June 12, 2026

The official channels

NWS hour-by-hour forecast for Santa ClaritaThe official forecast, including any heat advisories and extreme-heat warnings for the valley.

AirNow — Santa ClaritaThe official US AQI from local monitors — the number quoted on the news.

South Coast AQMD current air qualityThe air district for the Santa Clarita Valley, including its advisories.

LA County heat resourcesCooling centers and the county's heat-emergency guidance.