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7-Day Outlook: Heat Advisory for Hillsboro Area
July 18, 2026
weather, forecast
Hillsboro, Missouri — The next seven days bring highs ranging from 81°F to 95°F, lows from 62°F to 75°F, rain chances focused on Sunday and 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 18 at 3:04AM 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: Tuesday, with a high near 95°F.
- Coolest morning: Friday, with a low near 62°F.
- Rain chances: Best chances on Sunday and Friday; seven-day expected rainfall totals about 0.23 inches.
- Storm watch: Thunderstorm chances appear in the forecast on Today and Sunday.
- Windiest stretch: Tuesday, with gusts up to 33 mph.
- Sun safety: UV runs high on Today, Sunday, Monday and Tuesday and other days.
7-Day Forecast
| Day | Conditions | High / Low | Rain | Peak Gust |
|---|---|---|---|---|
| Today 7/18 | Mostly Sunny then Slight Chance Showers And Thunderstorms | 91° / 73° | 24% | 22 mph |
| Sunday 7/19 | Mostly Sunny then Chance Showers And Thunderstorms | 90° / 71° | 47% | 14 mph |
| Monday 7/20 | Sunny | 93° / 75° | 12% | 15 mph |
| Tuesday 7/21 | Sunny | 95° / 67° | 7% / 0.02" | 33 mph |
| Wednesday 7/22 | Sunny | 85° / 63° | 2% | 21 mph |
| Thursday 7/23 | Mostly Sunny | 81° / 64° | 5% | 7 mph |
| Friday 7/24 | Slight Chance Rain Showers | 85° / 62° | 20% / 0.21" | 28 mph |
Today's Details — Saturday, July 18
- Conditions: Mostly Sunny then Slight Chance Showers And Thunderstorms
- High / Low: 91°F / 73°F
- Wind: W 12 mph, gusts to 22 mph
- Precipitation: 24% chance
- UV Index: 7.85 — Very High — limit outdoor exposure
- Sunrise / Sunset: 05:53 / 20:23
- Daylight: 14.5 hours (12.3 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: Morning (lowest average rain risk).
Comfort & Conditions
- Humidity: 51%
- Dew Point: Up to 70°F — muggy conditions
Hour-by-Hour Breakdown
- Morning (6AM–Noon): Clear sky, 80°F, winds 10 mph, 65% humidity
- Afternoon (Noon–6PM): Mainly clear, 90°F, winds 11 mph, 42% humidity
- Evening (6PM–Midnight): Clear sky, 83°F, 11% chance of precipitation, 47% humidity
Air Quality & Allergens
- Air Quality Index: 61 (peak 63) — Moderate
- Acceptable air quality; some pollutants may be a concern for sensitive individuals.
- PM2.5: 15.9 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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