Observed 10:40 AM PDT at KLVK

Byron, CA weather

Sunny and 66°19°.

Mostly agree

Now 66°19°

Sunny

Wind: 5 mph8 km/hgusts 13 mph21 km/h; From the north-northwest. Up to 5 mph8 km/h through 10 PM
Dew point: 37°3°; Comfortable · up to 46°8° by 2 PM
UV index: 1Low; Moderate 11 AM–4 PM · peak 4
Air quality: 15Good; Main pollutant: Ozone
Pressure: 30.05 inHg1018 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

About the same as this time yesterday (59°15° then, 60°16° now)

Good hours for

High 72°22° today at 3 PM
Below 60°16° tonight after 9 PM
Low 49°9° tomorrow at 6 AM
Above 60°16° tomorrow by 10 AM

This morningNear 61°16° · Clear
This afternoonUp to 72°22° by 3 PM · Clear
TonightDown to 51°11° by 5 AM · Clear
Tomorrow morningUp to 63°17° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 75°24° by 3 PM · Mostly cloudy
Tomorrow nightDown to 51°11° by 5 AM · Partly cloudy
Monday morningUp to 55°13° by 9 AM · Partly 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 10a	Sunny	59°15° (likely 58°14° to 60°16°)	59°15°	0%	5 mph8 km/h from NNW, gusts 13 mph21 km/h	48%	0%	1
Sat 11a	Sunny	62°17° (likely 61°16° to 63°17°)	62°17°	0%	5 mph8 km/h from NNW, gusts 11 mph18 km/h	46%	0%	3
Sat 12p	Sunny	66°19° (likely 64°18° to 67°19°)	66°19°	0%	5 mph8 km/h from NNW, gusts 10 mph16 km/h	44%	0%	4
Sat 1p	Sunny	68°20° (likely 66°19° to 70°21°)	69°21°	0%	3 mph5 km/h from NNW, gusts 9 mph14 km/h	42%	0%	4
Sat 2p	Sunny	70°21° (likely 68°20° to 72°22°)	70°21°	0%	3 mph5 km/h from N, gusts 7 mph12 km/h	42%	0%	4
Sat 3p	Sunny	72°22° (likely 69°21° to 74°23°)	72°22°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	40%	0%	3
Sat 4p	Sunny	71°22° (likely 70°21° to 74°23°)	71°22°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	41%	0%	2
Sat 5p	Sunny	72°22° (likely 69°21° to 73°23°)	72°22°	0%	1 mph2 km/h from N, gusts 3 mph5 km/h	39%	0%	2
Sat 6p	Clear	69°21° (likely 66°19° to 69°21°)	69°21°	0%	1 mph2 km/h from WSW, gusts 2 mph4 km/h	46%	0%	0
Sat 7p	Clear	64°18° (likely 61°16° to 64°18°)	64°18°	0%	1 mph2 km/h from SW, gusts 4 mph7 km/h	52%	0%	0
Sat 8p	Clear	61°16° (likely 58°14° to 61°16°)	61°16°	0%	0 mph0 km/h, gusts 5 mph8 km/h	55%	0%	0
Sat 9p	Clear	59°15° (likely 55°13° to 59°15°)	59°15°	0%	0 mph0 km/h, gusts 5 mph8 km/h	56%	0%	0
Sat 10p	Clear	58°14° (likely 52°11° to 58°14°)	58°14°	0%	0 mph0 km/h, gusts 5 mph9 km/h	58%	0%	0
Sat 11p	Clear	57°14° (likely 51°11° to 57°14°)	57°14°	0%	0 mph0 km/h, gusts 3 mph5 km/h	61%	0%	0
Sun 12a	Clear	56°13° (likely 50°10° to 56°13°)	56°13°	0%	0 mph0 km/h, gusts 3 mph4 km/h	64%	0%	0
Sun 1a	Clear	54°12° (likely 49°9° to 56°13°)	54°12°	0%	0 mph0 km/h, gusts 2 mph4 km/h	67%	0%	0
Sun 2a	Clear	54°12° (likely 48°9° to 55°13°)	54°12°	0%	0 mph0 km/h, gusts 3 mph4 km/h	68%	0%	0
Sun 3a	Clear	52°11° (likely 47°8° to 54°12°)	52°11°	0%	0 mph0 km/h, gusts 3 mph4 km/h	66%	2%	0
Sun 4a	Mostly clear	52°11° (likely 45°7° to 54°12°)	52°11°	0%	0 mph0 km/h, gusts 3 mph5 km/h	66%	46%	0
Sun 5a	Mostly clear	51°11° (likely 45°7° to 53°12°)	51°11°	0%	0 mph0 km/h, gusts 3 mph4 km/h	70%	57%	0
Sun 6a	Mostly clear	49°9° (likely 45°7° to 52°11°)	49°9°	0%	0 mph0 km/h, gusts 2 mph3 km/h	70%	56%	0
Sun 7a	Mostly sunny	49°9° (likely 43°6° to 51°11°)	49°9°	0%	0 mph0 km/h, gusts 1 mph2 km/h	72%	62%	0
Sun 8a	Mostly sunny	50°10° (likely 43°6° to 52°11°)	50°10°	0%	1 mph2 km/h from NNE, gusts 1 mph2 km/h	72%	57%	0
Sun 9a	Mostly sunny	54°12° (likely 47°8° to 55°13°)	54°12°	0%	1 mph2 km/h from NNE, gusts 3 mph5 km/h	67%	70%	1
Sun 10a	Cloudy	60°16° (likely 52°11° to 60°16°)	60°16°	0%	1 mph2 km/h from NNE, gusts 4 mph6 km/h	62%	73%	2
Sun 11a	Cloudy	63°17° (likely 57°14° to 65°18°)	63°17°	0%	2 mph3 km/h from NE, gusts 3 mph5 km/h	56%	71%	3
Sun 12p	Cloudy	68°20° (likely 62°17° to 69°21°)	68°20°	0%	2 mph3 km/h from NE, gusts 3 mph4 km/h	51%	70%	4
Sun 1p	Cloudy	71°22° (likely 65°18° to 72°22°)	71°22°	0%	2 mph3 km/h from NE, gusts 3 mph6 km/h	48%	61%	4
Sun 2p	Cloudy	73°23° (likely 68°20° to 74°23°)	73°23°	0%	1 mph2 km/h from NNE, gusts 4 mph6 km/h	45%	74%	4
Sun 3p	Cloudy	75°24° (likely 70°21° to 75°24°)	75°24°	0%	1 mph2 km/h from NNE, gusts 4 mph6 km/h	43%	82%	3
Sun 4p	Mostly sunny	73°23° (likely 70°21° to 75°24°)	73°23°	0%	1 mph2 km/h from NNE, gusts 4 mph6 km/h	44%	81%	2
Sun 5p	Cloudy	75°24° (likely 70°21° to 75°24°)	75°24°	0%	1 mph2 km/h from NW, gusts 6 mph9 km/h	41%	81%	1
Sun 6p	Cloudy	72°22° (likely 67°19° to 72°22°)	72°22°	0%	1 mph2 km/h from NW, gusts 5 mph8 km/h	47%	82%	0
Sun 7p	Cloudy	67°19° (likely 63°17° to 67°19°)	67°19°	0%	1 mph2 km/h from NW, gusts 6 mph9 km/h	53%	83%	0
Sun 8p	Cloudy	63°17° (likely 59°15° to 63°17°)	63°17°	0%	0 mph0 km/h, gusts 7 mph11 km/h	58%	74%	0
Sun 9p	Cloudy	60°16° (likely 56°13° to 60°16°)	60°16°	0%	0 mph0 km/h, gusts 7 mph11 km/h	62%	76%	0
Sun 10p	Mostly clear	59°15° (likely 54°12° to 59°15°)	59°15°	0%	0 mph0 km/h, gusts 8 mph12 km/h	65%	18%	0
Sun 11p	Clear	58°14° (likely 53°12° to 58°14°)	58°14°	0%	1 mph2 km/h from WSW, gusts 8 mph14 km/h	68%	0%	0
Mon 12a	Clear	56°13° (likely 50°10° to 56°13°)	56°13°	0%	1 mph2 km/h from WSW, gusts 8 mph12 km/h	72%	0%	0
Mon 1a	Clear	55°13° (likely 49°9° to 55°13°)	55°13°	0%	1 mph2 km/h from WSW, gusts 6 mph10 km/h	76%	0%	0
Mon 2a	Clear	54°12° (likely 47°8° to 54°12°)	54°12°	0%	2 mph3 km/h from WSW, gusts 4 mph6 km/h	79%	2%	0
Mon 3a	Clear	53°12° (likely 45°7° to 53°12°)	53°12°	0%	2 mph3 km/h from WSW, gusts 4 mph6 km/h	81%	4%	0
Mon 4a	Clear	52°11° (likely 45°7° to 52°11°)	52°11°	0%	2 mph3 km/h from WSW, gusts 5 mph8 km/h	83%	7%	0
Mon 5a	Clear	51°11° (likely 44°7° to 53°12°)	51°11°	0%	2 mph3 km/h from WSW, gusts 5 mph8 km/h	84%	9%	0
Mon 6a	Mostly clear	50°10° (likely 42°6° to 53°12°)	50°10°	0%	2 mph3 km/h from WSW, gusts 5 mph7 km/h	86%	21%	0
Mon 7a	Mostly sunny	50°10° (likely 43°6° to 53°12°)	50°10°	0%	2 mph3 km/h from WSW, gusts 5 mph8 km/h	88%	48%	0
Mon 8a	Mostly sunny	51°11° (likely 44°7° to 53°12°)	50°10°	0%	3 mph5 km/h from SW, gusts 6 mph9 km/h	86%	41%	0
Mon 9a	Mostly sunny	55°13° (likely 50°10° to 58°14°)	55°13°	0%	3 mph5 km/h from SW, gusts 7 mph11 km/h	80%	41%	1

Days ahead

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

Today, Oct 24. Sunny. High 72°22°, low 48°9°. Typical 74°23° / 48°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 62°17°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 72°22°
  Dry
3. Evening
  6 PM–midnight
  Clear, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°11°
  Dry
Official NWS forecast
Today: Sunny, with a high near 72. North northwest wind 1 to 5 mph.
Tonight: Clear. Low around 48, with temperatures rising to around 51 overnight. West wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
70°21°–74°23°
Low, likely
48°9°–52°11°
Typical high / low
74°23° / 48°9°
Wind
11 mph17 km/h, gusts 17 mph28 km/h
UV peak
5
Tomorrow, Oct 25. Cloudy. High 76°24°, low 50°10°. Typical 74°23° / 48°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 75°24°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 63°17°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°11°
  Dry
Official NWS forecast
Day: Sunny, with a high near 76. North northeast wind around 2 mph.
Night: Partly cloudy, with a low around 50. West wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
70°21°–76°24°
Low, likely
43°6°–51°11°
Typical high / low
74°23° / 48°9°
Wind
7 mph11 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 73°23°, low 47°8°. Typical 74°23° / 47°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Mostly sunny, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 73. West southwest wind 2 to 9 mph, with gusts as high as 18 mph.
Night: Mostly clear, with a low around 47.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
69°21°–73°23°
Low, likely
45°7°–53°12°
Typical high / low
74°23° / 47°8°
Wind
12 mph20 km/h, gusts 23 mph37 km/h
UV peak
5
Tuesday, Oct 27. Mostly sunny. High 71°22°, low 48°9°. Typical 73°23° / 47°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 71.
Night: Partly cloudy, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–71°22°
Low, likely
44°7°–50°10°
Typical high / low
73°23° / 47°8°
Wind
9 mph14 km/h, gusts 15 mph24 km/h
UV peak
5
Wednesday, Oct 28. Cloudy. High 69°21°, low 49°9°. Typical 73°23° / 47°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 53°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 69.
Night: Mostly cloudy, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–69°21°
Low, likely
42°6°–51°11°
Typical high / low
73°23° / 47°8°
Wind
8 mph13 km/h
UV peak
4
Thursday, Oct 29. Cloudy. High 68°20°, low 48°9°. Typical 72°22° / 47°8°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain after 5pm. Partly sunny, with a high near 68.
Night: A chance of rain. Partly cloudy, with a low around 48.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
64°18°–70°21°
Low, likely
48°9°–55°13°
Typical high / low
72°22° / 47°8°
Wind
9 mph15 km/h, gusts 20 mph33 km/h
UV peak
4
Friday, Oct 30. Rain. High 66°19°, low 48°9°. Typical 72°22° / 46°8°. Rain, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain. Partly sunny, with a high near 66.
Night: A chance of rain. Partly cloudy, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–68°20°
Low, likely
40°4°–49°9°
Typical high / low
72°22° / 46°8°
Wind
11 mph18 km/h, gusts 21 mph34 km/h
UV peak
4
Saturday, Oct 31. Sunny. High 65°18°, low 45°7°. Typical 71°22° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 44°7°
  Dry
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
63°17°–68°20°
Low, likely
38°3°–49°9°
Typical high / low
71°22° / 46°8°
Wind
7 mph12 km/h, gusts 18 mph28 km/h
UV peak
4
Sunday, Nov 1. Sunny. High 65°18°, low 43°6°. Typical 71°22° / 46°8°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Drizzle, 46°8°
  Dry
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
61°16°–70°21°
Low, likely
35°2°–46°8°
Typical high / low
71°22° / 46°8°
Wind
8 mph13 km/h, gusts 16 mph26 km/h
UV peak
4
Monday, Nov 2. Drizzle. High 60°16°, low 46°8°. Typical 70°21° / 46°8°. Rain 0.1 in2.5 mm, 10% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 49°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 58°14°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 53°11°
  Dry
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
54°12°–66°19°
Low, likely
37°3°–52°11°
Typical high / low
70°21° / 46°8°
Wind
8 mph12 km/h, gusts 18 mph29 km/h
UV peak
1

10 days15 days30 days

The outlook

Today
Dry, high 72°, low 48°.
Tomorrow
Dry, high 76°, low 50°, warming up.
Monday
Dry, high 73°, low 47°, cooling off.
Rest of week
Mostly dry, highs 60–71°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (MTR) (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

Marsh Creek Reservoir

4.7 mi

Action stage

Level: 169 ft

Reading from Sat 10 AM · NWS gauge page

Discovery Bay at Discovery Bay Island Bay Blvd

2.5 mi

Level: 4.8 ft

Reading from Sat 9:15 AM · NWS gauge page

Italian Slough Headwater near Byron

3.3 mi

Level: 4.3 ft

Reading from Sat 9:30 AM · NWS gauge page

Old River at Byron

4.1 mi

Level: 3.9 ft

Reading from Sat 10 AM · NWS gauge page

For your home

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

Heating this week

About 62% less heating than a typical week.

This week 13Typical 34

Heating degree days, base 65°F

Comfort

Dry air outside (dew point 37°F).

Open the windows?

Today, 11:00 AM–8:00 PM

Good stretch to open the windows.

Is this typical?

LIVERMORE · official normals 1991–2020 · records 1903–2026

Oct 24, today vs a typical year

Today’s expected high is 2°1° colder than typical.

Last 7 days vs normal

On average 2°1° colder than normal (daily mean temperature).

+2°+1°SunOct 18
−1°MonOct 19
−4°−2°TueOct 20
−3°−2°WedOct 21
−4°−2°ThuOct 22
±0°FriOct 23
—SatOct 24

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

Sun & moon

Sun

Daylight: 10 h 53 min; Losing 2 min 16 s a day; shortest Dec 21, 1 h 20 min less
Golden hour: 5:40–6:33 PM; Morning 7:07–8:00 AM
Blue hour: 6:33–6:43 PM; Morning 6:57–7:07 AM; first light 6:57 AM

Stars tonight? Fair

Mostly clear 6:43 PM–4 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

97% lit · growing

Today: sets 5:45 AM · rises 5:16 PM
Full moon: Oct 25
New moon: Nov 8

Looking northeast from Byron. The highest point on the skyline is about 8,000 ft, 91 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.