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7-Day Outlook: Heat Advisory for Hillsboro Area
July 21, 2026
weather, forecast
Hillsboro, Missouri — The next seven days bring highs ranging from 79°F to 96°F, lows from 61°F to 78°F, rain chances focused on Friday. Today's forecast is still included below, but the main story is the week ahead.
⚠️ Active Weather Alerts
- 🟡 Heat Advisory: Heat Advisory issued July 21 at 2:48AM CDT until July 21 at 7:00PM CDT by NWS St Louis MO
- Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors. Young children and
pets should never be left unattended in vehicles under any
circumstances. Take extra precautions if you work or spend time
outside. When possible reschedule stren
What Matters Most This Week
- Warmest day: Today, with a high near 96°F.
- Coolest morning: Wednesday, with a low near 61°F.
- Rain chances: Best chances on Friday; seven-day expected rainfall totals about 0.46 inches.
- Storm watch: Thunderstorm chances appear in the forecast on Friday and Saturday.
- Windiest stretch: Monday, with gusts up to 35 mph.
- Sun safety: UV runs high on Today, Wednesday, Saturday and Sunday and other days.
7-Day Forecast
| Day | Conditions | High / Low | Rain | Peak Gust |
|---|---|---|---|---|
| Today 7/21 | Slight Chance Rain Showers then Mostly Sunny | 96° / 67° | 17% | 24 mph |
| Wednesday 7/22 | Mostly Sunny | 83° / 61° | 0% | 22 mph |
| Thursday 7/23 | Mostly Sunny | 80° / 61° | 1% | 16 mph |
| Friday 7/24 | Chance Rain Showers then Chance Showers And Thunderstorms | 79° / 62° | 41% / 0.36" | 19 mph |
| Saturday 7/25 | Chance Showers And Thunderstorms | 87° / 67° | 25% / 0.04" | 16 mph |
| Sunday 7/26 | Sunny | 94° / 72° | 1% / 0.05" | 32 mph |
| Monday 7/27 | Mostly Sunny | 95° / 78° | 7% / 0.01" | 35 mph |
Today's Details — Tuesday, July 21
- Conditions: Slight Chance Rain Showers then Mostly Sunny
- High / Low: 96°F / 67°F
- Wind: WNW 15 mph, gusts to 24 mph
- Precipitation: 17% chance
- UV Index: 7.85 — Very High — limit outdoor exposure
- Sunrise / Sunset: 05:55 / 20:21
- Daylight: 14.4 hours (10.6 hours of sunshine expected)
What Matters Most Today
- Sun safety: UV index reaches 7.85; sunscreen still matters even with cloud cover.
- Best outdoor window: Evening (lowest average rain risk).
Comfort & Conditions
- Humidity: 49%
- Dew Point: Up to 75°F — muggy conditions
Hour-by-Hour Breakdown
- Morning (6AM–Noon): Overcast, 84°F, winds 11 mph, 68% humidity
- Afternoon (Noon–6PM): Clear sky, 94°F, winds 14 mph, 39% humidity
- Evening (6PM–Midnight): Clear sky, 84°F, winds 11 mph, 40% humidity
Air Quality & Allergens
- Air Quality Index: 68 (peak 87) — Moderate
- Acceptable air quality; some pollutants may be a concern for sensitive individuals.
- PM2.5: 15.7 µg/m³
Forecast data provided by Open-Meteo. Air quality data from Open-Meteo Air Quality API. For severe weather alerts, visit your local National Weather Service office.
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