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Thunderstorm Chances Focus on Sunday, Tuesday in Colby

August 20, 2026 weather, forecast

Colby, Kansas — The next seven days bring highs ranging from 91°F to 100°F, lows from 64°F to 70°F, rain chances focused on Tuesday. Today's forecast is still included below, but the main story is the week ahead.

What Matters Most This Week

Warmest day: Friday, with a high near 100°F.
Coolest morning: Friday, with a low near 64°F.
Rain chances: Best chances on Tuesday; seven-day expected rainfall totals about 0.14 inches.
Storm watch: Thunderstorm chances appear in the forecast on Sunday, Tuesday and Wednesday.
Windiest stretch: Wednesday, with gusts up to 39 mph.
Sun safety: UV runs high on Today, Friday, Saturday and Sunday and other days.

7-Day Forecast

Day	Conditions	High / Low	Rain	Peak Gust
Today 8/20	Patchy Fog then Sunny	93° / 65°	3%	21 mph
Friday 8/21	Sunny	100° / 64°	2%	34 mph
Saturday 8/22	Mostly Sunny	91° / 65°	14%	31 mph
Sunday 8/23	Slight Chance Showers And Thunderstorms then Mostly Sunny	93° / 66°	21% / 0.03"	32 mph
Monday 8/24	Mostly Sunny	97° / 66°	6%	24 mph
Tuesday 8/25	Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms	94° / 64°	26% / 0.07"	22 mph
Wednesday 8/26	Slight Chance Showers And Thunderstorms	91° / 70°	19% / 0.04"	39 mph

Today's Details — Thursday, August 20

Conditions: Patchy Fog then Sunny
High / Low: 93°F / 65°F
Wind: SSE 12 mph, gusts to 21 mph
Precipitation: 3% chance
UV Index: 7.75 — Very High — limit outdoor exposure
Sunrise / Sunset: 07:01 / 20:32
Daylight: 13.5 hours (11.0 hours of sunshine expected)

What Matters Most Today

Sun safety: UV index reaches 7.75; sunscreen still matters even with cloud cover.
Best outdoor window: Midday (lowest average rain risk).

Comfort & Conditions

Humidity: 67%
Dew Point: Up to 68°F — muggy conditions

Hour-by-Hour Breakdown

Morning (6AM–Noon): Overcast, 68°F, 92% humidity
Afternoon (Noon–6PM): Clear sky, 88°F, winds 10 mph, 54% humidity
Evening (6PM–Midnight): Clear sky, 85°F, 50% humidity

Air Quality & Allergens

Air Quality Index: 36 (peak 49) — Good
PM2.5: 7.2 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.