Observed 5:25 PM EDT at KDAY

Union, OH weather

Mostly sunny and 66°19°, jacket by 9 PM.

Forecasts agree

Now 66°19°

Mostly sunny

Wind: 5 mph7 km/h; From the east-northeast. Up to 5 mph8 km/h through 5 AM
Dew point: 45°7°; Comfortable
UV tomorrow: 4Moderate; Moderate 12–5 PM · peak 4
Air quality: 54Moderate; Main pollutant: Ozone
Pressure: 30.4 inHg1029 hPa; Falling slowly · −0.02 inHg−0.6 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Below 60°16° tonight after 8 PM
Low 42°6° tomorrow at 8 AM
Above 60°16° tomorrow by noon

TonightDown to 44°7° by 5 AM · Clear
Tomorrow morningUp to 58°14° by 11 AM · Clear
Tomorrow afternoonUp to 72°22° by 4 PM · Partly cloudy
Tomorrow nightDown to 46°8° by 4 AM · Partly cloudy
Monday morningUp to 61°16° by 11 AM · Partly cloudy
Monday afternoonUp to 74°23° by 3 PM · Mostly cloudy

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 5p	Mostly sunny	68°20° (likely 66°19° to 69°21°)	68°20°	0%	5 mph8 km/h from E, gusts 8 mph13 km/h	41%	13%	2
Sat 6p	Mostly sunny	67°19° (likely 63°17° to 68°20°)	67°19°	0%	5 mph8 km/h from E, gusts 8 mph13 km/h	43%	25%	1
Sat 7p	Mostly clear	64°18° (likely 58°14° to 64°18°)	64°18°	0%	5 mph8 km/h from E, gusts 8 mph13 km/h	49%	62%	0
Sat 8p	Mostly clear	57°14° (likely 56°13° to 60°16°)	57°14°	0%	5 mph8 km/h from E, gusts 9 mph15 km/h	58%	44%	0
Sat 9p	Mostly clear	54°12° (likely 54°12° to 58°14°)	54°12°	0%	5 mph8 km/h from E, gusts 11 mph18 km/h	69%	45%	0
Sat 10p	Mostly clear	53°12° (likely 52°11° to 57°14°)	53°12°	0%	3 mph5 km/h from E, gusts 11 mph17 km/h	74%	23%	0
Sat 11p	Clear	51°11° (likely 51°11° to 55°13°)	51°11°	0%	3 mph5 km/h from E, gusts 12 mph19 km/h	77%	12%	0
Sun 12a	Clear	50°10° (likely 49°9° to 54°12°)	50°10°	0%	2 mph3 km/h from SE, gusts 10 mph16 km/h	80%	8%	0
Sun 1a	Clear	49°9° (likely 48°9° to 52°11°)	49°9°	0%	2 mph3 km/h from SE, gusts 9 mph15 km/h	83%	3%	0
Sun 2a	Clear	48°9° (likely 47°8° to 51°11°)	48°9°	0%	2 mph3 km/h from SE, gusts 8 mph13 km/h	87%	0%	0
Sun 3a	Clear	46°8° (likely 46°8° to 50°10°)	46°8°	0%	2 mph3 km/h from SE, gusts 7 mph11 km/h	93%	0%	0
Sun 4a	Clear	45°7° (likely 45°7° to 49°9°)	45°7°	0%	2 mph3 km/h from SE, gusts 6 mph9 km/h	92%	0%	0
Sun 5a	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	96%	0%	0
Sun 6a	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	99%	0%	0
Sun 7a	Clear	43°6° (likely 43°6° to 46°8°)	43°6°	0%	2 mph3 km/h from SE, gusts 3 mph6 km/h	97%	0%	0
Sun 8a	Sunny	42°6° (likely 42°6° to 45°7°)	42°6°	0%	2 mph3 km/h from SE, gusts 4 mph7 km/h	100%	0%	0
Sun 9a	Sunny	45°7° (likely 45°7° to 47°8°)	45°7°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	100%	0%	0
Sun 10a	Sunny	53°12° (likely 51°11° to 53°12°)	53°12°	0%	2 mph3 km/h from SE, gusts 6 mph9 km/h	84%	36%	1
Sun 11a	Sunny	58°14° (likely 56°13° to 58°14°)	58°14°	0%	3 mph5 km/h from SE, gusts 5 mph9 km/h	73%	5%	2
Sun 12p	Mostly sunny	63°17° (likely 61°16° to 63°17°)	63°17°	0%	5 mph8 km/h from S, gusts 7 mph11 km/h	61%	43%	3
Sun 1p	Mostly sunny	67°19° (likely 64°18° to 67°19°)	67°19°	0%	3 mph5 km/h from S, gusts 6 mph10 km/h	54%	51%	4
Sun 2p	Mostly sunny	70°21° (likely 66°19° to 70°21°)	70°21°	0%	3 mph5 km/h from S, gusts 6 mph9 km/h	48%	69%	4
Sun 3p	Cloudy	70°21° (likely 67°19° to 70°21°)	70°21°	0%	3 mph5 km/h from S, gusts 5 mph9 km/h	46%	78%	4
Sun 4p	Mostly sunny	72°22° (likely 67°19° to 72°22°)	72°22°	0%	3 mph5 km/h from SE, gusts 4 mph7 km/h	44%	57%	3
Sun 5p	Mostly sunny	70°21° (likely 66°19° to 70°21°)	70°21°	0%	3 mph5 km/h from SE, gusts 5 mph8 km/h	43%	49%	2
Sun 6p	Mostly sunny	69°21° (likely 64°18° to 69°21°)	69°21°	0%	2 mph3 km/h from SE, gusts 4 mph7 km/h	49%	65%	1
Sun 7p	Mostly clear	66°19° (likely 60°16° to 66°19°)	66°19°	0%	2 mph3 km/h from SE, gusts 3 mph4 km/h	51%	53%	0
Sun 8p	Mostly clear	59°15° (likely 57°14° to 60°16°)	59°15°	0%	2 mph3 km/h from SE, gusts 4 mph7 km/h	61%	68%	0
Sun 9p	Mostly clear	56°13° (likely 55°13° to 59°15°)	56°13°	0%	2 mph3 km/h from SE, gusts 6 mph9 km/h	73%	50%	0
Sun 10p	Mostly clear	54°12° (likely 53°12° to 57°14°)	54°12°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	76%	13%	0
Sun 11p	Mostly clear	52°11° (likely 51°11° to 55°13°)	52°11°	0%	2 mph3 km/h from SE, gusts 6 mph9 km/h	80%	16%	0
Mon 12a	Mostly clear	51°11° (likely 50°10° to 54°12°)	51°11°	0%	2 mph3 km/h from SE, gusts 6 mph10 km/h	84%	30%	0
Mon 1a	Clear	50°10° (likely 49°9° to 53°12°)	50°10°	0%	1 mph2 km/h from SE, gusts 7 mph11 km/h	85%	15%	0
Mon 2a	Mostly clear	48°9° (likely 48°9° to 51°11°)	48°9°	0%	1 mph2 km/h from S, gusts 6 mph10 km/h	89%	46%	0
Mon 3a	Mostly clear	47°8° (likely 47°8° to 51°11°)	47°8°	0%	1 mph2 km/h from S, gusts 6 mph10 km/h	90%	49%	0
Mon 4a	Clear	46°8° (likely 46°8° to 51°11°)	46°8°	0%	1 mph2 km/h from S, gusts 5 mph9 km/h	93%	63%	0
Mon 5a	Mostly clear	46°8° (likely 45°7° to 49°9°)	46°8°	0%	1 mph2 km/h from S, gusts 6 mph9 km/h	93%	68%	0
Mon 6a	Mostly clear	45°7° (likely 45°7° to 49°9°)	45°7°	0%	1 mph2 km/h from S, gusts 5 mph9 km/h	93%	43%	0
Mon 7a	Mostly clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	0 mph0 km/h, gusts 5 mph8 km/h	96%	58%	0
Mon 8a	Partly sunny	44°7° (likely 44°7° to 47°8°)	44°7°	0%	0 mph0 km/h, gusts 5 mph8 km/h	96%	45%	0
Mon 9a	Mostly sunny	47°8° (likely 46°8° to 49°9°)	47°8°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	94%	45%	0
Mon 10a	Mostly sunny	54°12° (likely 53°12° to 55°13°)	54°12°	0%	1 mph2 km/h from SW, gusts 6 mph9 km/h	78%	44%	1
Mon 11a	Mostly sunny	61°16° (likely 58°14° to 61°16°)	61°16°	0%	1 mph2 km/h from SW, gusts 6 mph9 km/h	66%	61%	2
Mon 12p	Mostly sunny	66°19° (likely 63°17° to 66°19°)	66°19°	0%	1 mph2 km/h from SW, gusts 6 mph9 km/h	56%	58%	3
Mon 1p	Mostly sunny	70°21° (likely 67°19° to 70°21°)	70°21°	0%	2 mph3 km/h from W, gusts 6 mph10 km/h	49%	52%	4
Mon 2p	Mostly sunny	72°22° (likely 70°21° to 72°22°)	72°22°	0%	2 mph3 km/h from W, gusts 7 mph11 km/h	45%	52%	4
Mon 3p	Cloudy	74°23° (likely 71°22° to 74°23°)	74°23°	0%	2 mph3 km/h from W, gusts 8 mph12 km/h	42%	75%	4
Mon 4p	Cloudy	74°23° (likely 71°22° to 74°23°)	74°23°	0%	2 mph3 km/h from W, gusts 7 mph12 km/h	40%	74%	3

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Mostly sunny. High 70°21°, low 42°6°. Typical 63°17° / 43°6°. Dry. Forecasts agree.
1. Evening
  6 PM–midnight
  Mostly clear, 57°14°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 44°7°
  Dry
Official NWS forecast
Today: Sunny, with a high near 70. East wind around 5 mph.
Tonight: Mostly clear, with a low around 42. East wind 1 to 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–70°21°
Low, likely
41°5°–44°7°
Typical high / low
63°17° / 43°6°
Wind
9 mph14 km/h, gusts 18 mph28 km/h
UV peak
4
Tomorrow, Oct 25. Cloudy. High 72°22°, low 44°7°. Typical 62°17° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 72°22°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 46°8°
  Dry
Official NWS forecast
Day: Sunny, with a high near 72. Southeast wind 1 to 5 mph.
Night: Mostly clear, with a low around 44. Southeast wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–72°22°
Low, likely
42°6°–45°7°
Typical high / low
62°17° / 43°6°
Wind
8 mph13 km/h, gusts 16 mph26 km/h
UV peak
4
Monday, Oct 26. Cloudy. High 74°23°, low 46°8°. Typical 62°17° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 74°23°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 49°9°
  Dry
Official NWS forecast
Day: Sunny, with a high near 74. Southwest wind around 2 mph.
Night: Partly cloudy, with a low around 46.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
71°22°–74°23°
Low, likely
43°6°–47°8°
Typical high / low
62°17° / 42°6°
Wind
7 mph11 km/h
UV peak
4
Tuesday, Oct 27. Cloudy. High 71°22°, low 49°9°. Typical 61°16° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 71.
Night: Mostly cloudy, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
68°20°–72°22°
Low, likely
44°7°–49°9°
Typical high / low
61°16° / 42°6°
Wind
7 mph12 km/h, gusts 15 mph25 km/h
UV peak
3
Wednesday, Oct 28. Cloudy. High 73°23°, low 49°9°. Typical 61°16° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 72°22°
  Dry
3. Evening
  6 PM–midnight
  Clear, 62°16°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 73.
Night: Partly cloudy, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
70°21°–73°23°
Low, likely
49°9°–52°11°
Typical high / low
61°16° / 42°6°
Wind
10 mph15 km/h, gusts 15 mph24 km/h
UV peak
4
Thursday, Oct 29. Mostly sunny. High 77°25°, low 48°9°. Typical 60°16° / 41°5°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 74°23°
  Dry
3. Evening
  6 PM–midnight
  Clear, 62°17°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 77.
Night: Mostly clear, with a low around 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
73°23°–77°25°
Low, likely
47°8°–52°11°
Typical high / low
60°16° / 41°5°
Wind
12 mph19 km/h, gusts 22 mph35 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 76°24°, low 52°11°. Typical 60°16° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 51°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 63°17°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 53°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 76.
Night: Partly cloudy, with a low around 52.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
68°20°–76°24°
Low, likely
46°8°–54°12°
Typical high / low
60°16° / 41°5°
Wind
9 mph14 km/h, gusts 20 mph32 km/h
UV peak
3
Saturday, Oct 31. Cloudy. High 73°23°, low 52°11°. Typical 60°16° / 41°5°. Rain 0.02 in0.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 74°23°
  20% chance
3. Evening
  6 PM–midnight
  Cloudy, 67°19°
  30% chance
4. Overnight
  midnight–6 AM
  Cloudy, 62°17°
  50% chance · 0.11 in2.9 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
66°19°–78°26°
Low, likely
47°8°–59°15°
Typical high / low
60°16° / 41°5°
Wind
12 mph19 km/h, gusts 22 mph36 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 68°20°, low 60°16°. Typical 59°15° / 40°4°. Rain 0.47 in12 mm, 50% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 62°16°
  50% chance · 0.28 in7.2 mm
2. Afternoon
  noon–6 PM
  Mostly sunny, 67°19°
  50% chance · 0.11 in2.7 mm
3. Evening
  6 PM–midnight
  Drizzle, 66°19°
  40% chance · 0.03 in0.7 mm
4. Overnight
  midnight–6 AM
  Showers, 61°16°
  40% chance · 0.39 in9.8 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–70°21°
Low, likely
57°14°–63°17°
Typical high / low
59°15° / 40°4°
Wind
19 mph31 km/h, gusts 32 mph52 km/h
UV peak
3
Monday, Nov 2. Showers. High 67°19°, low 51°11°. Typical 59°15° / 40°4°. Rain 0.66 in17 mm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Showers, 59°15°
  40% chance · 0.3 in7.5 mm
2. Afternoon
  noon–6 PM
  Drizzle, 56°14°
  40% chance · 0.07 in1.8 mm
3. Evening
  6 PM–midnight
  Partly cloudy, 51°10°
  40% chance · 0.04 in1 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–69°21°
Low, likely
40°4°–60°16°
Typical high / low
59°15° / 40°4°
Wind
18 mph29 km/h, gusts 38 mph62 km/h

10 days15 days30 days

The outlook

Today
Dry, high 70°, low 42°.
Tomorrow
Dry, high 72°, low 44°.
Monday
Dry, high 74°, low 46°.
Rest of week
Mostly dry, highs 67–77°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (ILN) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Stillwater River above Englewood

2.5 mi

Below flood stage

Level: 2.8 ft
Flow: 123 cfs

Forecast peak 2.8 ft Sat 8 PM

Reading from Sat 4:30 PM · NWS gauge page

Great Miami River near Taylorsville

7.3 mi

Below flood stage

Level: 2.9 ft
Flow: 765 cfs

Forecast peak 2.9 ft Sat 8 PM

Reading from Sat 4:30 PM · NWS gauge page

Great Miami River at Troy

10 mi

Below flood stage

Level: 2.5 ft
Flow: 238 cfs

Forecast peak 2.5 ft Sat 8 PM

Reading from Sat 4 PM · NWS gauge page

Great Miami River at Dayton

11 mi

Below flood stage

Level: 24.3 ft
Flow: 907 cfs

Forecast peak 24.3 ft Sat 8 PM

Reading from Sat 4:30 PM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 78% less heating than a typical week.

This week 21Typical 94

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 14
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 1 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 45°F).

Open the windows?

Today, 6:00 PM–7:00 PM

Good stretch to open the windows.

Is this typical?

Dayton International Airport · official normals 1991–2020 · records 1893–2026

Oct 24, today vs a typical year

Today’s expected high is 7°4° warmer than typical.

Last 7 days vs normal

On average 1°0° colder than normal (daily mean temperature).

−5°−3°SunOct 18
−2°−1°MonOct 19
+1°±0°TueOct 20
±0°WedOct 21
+2°+1°ThuOct 22
+2°+1°FriOct 23
—SatOct 24

Union weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 48 min; Losing 2 min 30 s a day; shortest Dec 21, 1 h 27 min less
Golden hour: 6:07–7:01 PM; Morning 7:40–8:34 AM
Blue hour: 7:01–7:12 PM; Morning 7:29–7:40 AM; first light 7:29 AM

Stars tonight? Fair

Mostly clear 10 PM–7:30 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 6:10 AM · rises 5:42 PM
Full moon: Oct 26
New moon: Nov 9

Looking west from Union. A level horizon.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Union, OH weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Stillwater River above Englewood

Great Miami River near Taylorsville

Great Miami River at Troy

Great Miami River at Dayton

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon