Observed 4:50 AM PDT at KLVK

Discovery Bay, CA weather

Clear and 45°7°.

Mostly agree

Now 45°7°

Clear

Wind: Calm; Up to 5 mph8 km/h through 5 PM
Dew point: 37°3°; Comfortable · up to 46°8° by 2 PM
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 33Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.03 inHg1017 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Above 60°16° today by 11 AM
High 72°22° today at 3 PM
Below 60°16° tonight after 9 PM

This morningUp to 62°17° by 11 AM · Clear
This afternoonUp to 72°22° by 3 PM · Clear
TonightDown to 49°9° by 5 AM · Clear
Tomorrow morningUp to 63°17° by 11 AM · Partly cloudy
Tomorrow afternoonUp to 75°24° by 3 PM · Mostly cloudy
Tomorrow nightDown to 50°10° by 4 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 5a	Clear	49°9° (likely 49°9° to 53°12°)	48°9°	0%	5 mph8 km/h from WNW, gusts 9 mph14 km/h	56%	0%	0
Sat 6a	Clear	50°10° (likely 49°9° to 52°11°)	48°9°	0%	5 mph8 km/h from WNW, gusts 10 mph15 km/h	56%	0%	0
Sat 7a	Sunny	49°9° (likely 48°9° to 52°11°)	47°8°	0%	5 mph8 km/h from WNW, gusts 9 mph15 km/h	58%	0%	0
Sat 8a	Sunny	49°9° (likely 48°9° to 52°11°)	48°9°	0%	3 mph5 km/h from WNW, gusts 8 mph12 km/h	59%	0%	0
Sat 9a	Sunny	55°13° (likely 53°12° to 56°13°)	55°13°	0%	5 mph8 km/h from NNW, gusts 9 mph14 km/h	51%	0%	0
Sat 10a	Sunny	59°15° (likely 57°14° to 60°16°)	59°15°	0%	5 mph8 km/h from NNW, gusts 13 mph20 km/h	47%	0%	1
Sat 11a	Sunny	62°17° (likely 61°16° to 64°18°)	62°17°	0%	5 mph8 km/h from NNW, gusts 12 mph20 km/h	45%	0%	3
Sat 12p	Sunny	67°19° (likely 64°18° to 69°21°)	67°19°	0%	5 mph8 km/h from NNW, gusts 12 mph19 km/h	43%	0%	4
Sat 1p	Sunny	69°21° (likely 67°19° to 72°22°)	69°21°	0%	5 mph8 km/h from N, gusts 10 mph16 km/h	41%	0%	4
Sat 2p	Sunny	71°22° (likely 69°21° to 74°23°)	71°22°	0%	3 mph5 km/h from N, gusts 9 mph14 km/h	41%	0%	4
Sat 3p	Sunny	72°22° (likely 70°21° to 75°24°)	72°22°	0%	3 mph5 km/h from N, gusts 8 mph13 km/h	39%	0%	3
Sat 4p	Sunny	72°22° (likely 70°21° to 75°24°)	72°22°	0%	2 mph3 km/h from N, gusts 7 mph11 km/h	40%	0%	2
Sat 5p	Sunny	72°22° (likely 70°21° to 73°23°)	72°22°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	39%	0%	2
Sat 6p	Clear	69°21° (likely 66°19° to 69°21°)	69°21°	0%	1 mph2 km/h from S, gusts 4 mph6 km/h	45%	0%	0
Sat 7p	Clear	63°17° (likely 61°16° to 65°18°)	63°17°	0%	0 mph0 km/h, gusts 3 mph4 km/h	53%	0%	0
Sat 8p	Clear	60°16° (likely 58°14° to 61°16°)	60°16°	0%	0 mph0 km/h, gusts 5 mph8 km/h	56%	0%	0
Sat 9p	Clear	59°15° (likely 55°13° to 59°15°)	59°15°	0%	0 mph0 km/h, gusts 4 mph7 km/h	58%	0%	0
Sat 10p	Clear	57°14° (likely 53°12° to 57°14°)	57°14°	0%	0 mph0 km/h, gusts 3 mph5 km/h	59%	0%	0
Sat 11p	Clear	56°13° (likely 51°11° to 56°13°)	56°13°	0%	0 mph0 km/h, gusts 4 mph6 km/h	63%	0%	0
Sun 12a	Clear	54°12° (likely 50°10° to 55°13°)	54°12°	0%	0 mph0 km/h, gusts 4 mph6 km/h	69%	0%	0
Sun 1a	Clear	53°12° (likely 48°9° to 54°12°)	53°12°	0%	0 mph0 km/h, gusts 4 mph6 km/h	71%	0%	0
Sun 2a	Clear	52°11° (likely 47°8° to 53°12°)	52°11°	0%	0 mph0 km/h, gusts 4 mph6 km/h	73%	0%	0
Sun 3a	Clear	51°11° (likely 46°8° to 53°12°)	51°11°	0%	0 mph0 km/h, gusts 3 mph4 km/h	71%	1%	0
Sun 4a	Clear	50°10° (likely 45°7° to 52°11°)	50°10°	0%	0 mph0 km/h, gusts 2 mph4 km/h	74%	42%	0
Sun 5a	Mostly clear	49°9° (likely 44°7° to 52°11°)	49°9°	0%	0 mph0 km/h, gusts 2 mph3 km/h	78%	49%	0
Sun 6a	Mostly clear	48°9° (likely 43°6° to 51°11°)	48°9°	0%	0 mph0 km/h, gusts 2 mph3 km/h	77%	30%	0
Sun 7a	Sunny	48°9° (likely 42°6° to 50°10°)	48°9°	0%	0 mph0 km/h, gusts 2 mph3 km/h	78%	10%	0
Sun 8a	Mostly sunny	49°9° (likely 41°5° to 51°11°)	49°9°	0%	0 mph0 km/h, gusts 2 mph3 km/h	78%	54%	0
Sun 9a	Mostly sunny	54°12° (likely 47°8° to 54°12°)	54°12°	0%	0 mph0 km/h, gusts 3 mph5 km/h	69%	58%	1
Sun 10a	Mostly sunny	60°16° (likely 52°11° to 60°16°)	60°16°	0%	0 mph0 km/h, gusts 4 mph7 km/h	61%	63%	2
Sun 11a	Mostly sunny	63°17° (likely 57°14° to 65°18°)	63°17°	0%	2 mph3 km/h from NE, gusts 3 mph5 km/h	55%	50%	3
Sun 12p	Mostly sunny	68°20° (likely 62°17° to 69°21°)	68°20°	0%	2 mph3 km/h from NE, gusts 2 mph4 km/h	51%	52%	4
Sun 1p	Mostly sunny	71°22° (likely 65°18° to 73°23°)	71°22°	0%	2 mph3 km/h from NE, gusts 3 mph5 km/h	47%	65%	4
Sun 2p	Cloudy	73°23° (likely 68°20° to 75°24°)	73°23°	0%	2 mph3 km/h from NNE, gusts 5 mph8 km/h	45%	79%	4
Sun 3p	Cloudy	75°24° (likely 70°21° to 76°24°)	75°24°	0%	2 mph3 km/h from NNE, gusts 4 mph6 km/h	43%	83%	3
Sun 4p	Cloudy	74°23° (likely 71°22° to 76°24°)	74°23°	0%	2 mph3 km/h from NNE, gusts 5 mph7 km/h	43%	82%	3
Sun 5p	Cloudy	75°24° (likely 70°21° to 75°24°)	75°24°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	41%	81%	1
Sun 6p	Cloudy	72°22° (likely 67°19° to 72°22°)	72°22°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	47%	79%	0
Sun 7p	Cloudy	67°19° (likely 62°17° to 67°19°)	67°19°	0%	2 mph3 km/h from NW, gusts 9 mph14 km/h	54%	73%	0
Sun 8p	Mostly clear	62°17° (likely 59°15° to 63°17°)	63°17°	0%	0 mph0 km/h, gusts 11 mph18 km/h	60%	48%	0
Sun 9p	Clear	60°16° (likely 56°13° to 60°16°)	60°16°	0%	0 mph0 km/h, gusts 9 mph15 km/h	64%	27%	0
Sun 10p	Clear	58°14° (likely 53°12° to 59°15°)	58°14°	0%	0 mph0 km/h, gusts 9 mph14 km/h	67%	12%	0
Sun 11p	Clear	57°14° (likely 51°11° to 58°14°)	57°14°	0%	1 mph2 km/h from WSW, gusts 7 mph11 km/h	70%	13%	0
Mon 12a	Clear	55°13° (likely 48°9° to 59°15°)	55°13°	0%	1 mph2 km/h from WSW, gusts 4 mph6 km/h	75%	28%	0
Mon 1a	Mostly clear	54°12° (likely 46°8° to 57°14°)	54°12°	0%	1 mph2 km/h from WSW, gusts 3 mph4 km/h	80%	6%	0
Mon 2a	Mostly clear	52°11° (likely 44°7° to 56°13°)	52°11°	0%	2 mph3 km/h from WSW, gusts 2 mph4 km/h	84%	10%	0
Mon 3a	Mostly clear	51°11° (likely 43°6° to 55°13°)	51°11°	0%	2 mph3 km/h from WSW, gusts 3 mph5 km/h	87%	12%	0
Mon 4a	Clear	50°10° (likely 43°6° to 54°12°)	50°10°	0%	2 mph3 km/h from WSW, gusts 4 mph6 km/h	89%	14%	0

Days ahead

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

Today, Oct 24. Sunny. High 73°23°, low 49°9°. Typical 76°24° / 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 72°22°
  Dry
3. Evening
  6 PM–midnight
  Clear, 60°16°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°9°
  Dry
Official NWS forecast
Today: Sunny, with a high near 73. North northwest wind around 5 mph.
Tonight: Clear, with a low around 49. West northwest wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
70°21°–75°24°
Low, likely
48°9°–51°11°
Typical high / low
76°24° / 52°11°
Wind
10 mph15 km/h, gusts 16 mph26 km/h
UV peak
5
Tomorrow, Oct 25. Cloudy. High 76°24°, low 48°9°. Typical 75°24° / 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 75°24°
  Dry
3. Evening
  6 PM–midnight
  Clear, 62°17°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 50°10°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 76. North northeast wind around 2 mph.
Night: Mostly clear, with a low around 48. West northwest wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
71°22°–76°24°
Low, likely
41°5°–50°10°
Typical high / low
75°24° / 52°11°
Wind
8 mph13 km/h, gusts 18 mph29 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 74°23°, low 46°8°. Typical 75°24° / 52°11°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Partly sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°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 74.
Night: Patchy fog between 3am and 5am. Mostly clear, with a low around 46.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
69°21°–74°23°
Low, likely
45°7°–53°12°
Typical high / low
75°24° / 52°11°
Wind
14 mph23 km/h, gusts 20 mph32 km/h
UV peak
5
Tuesday, Oct 27. Mostly sunny. High 71°22°, low 47°8°. Typical 74°23° / 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  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 71.
Night: Partly cloudy, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–71°22°
Low, likely
45°7°–50°10°
Typical high / low
74°23° / 52°11°
Wind
10 mph16 km/h, gusts 16 mph26 km/h
UV peak
5
Wednesday, Oct 28. Cloudy. High 70°21°, low 48°9°. Typical 74°23° / 51°11°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  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, 54°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 70.
Night: Mostly cloudy, with a low around 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–70°21°
Low, likely
42°6°–50°10°
Typical high / low
74°23° / 51°11°
Wind
10 mph16 km/h
UV peak
4
Thursday, Oct 29. Cloudy. High 68°20°, low 48°9°. Typical 74°23° / 51°11°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 66°19°
  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: Patchy fog between 7am and 9am, then a slight chance of rain. Partly sunny, with a high near 68.
Night: A chance of rain. Partly cloudy, with a low around 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
65°18°–68°20°
Low, likely
48°9°–53°12°
Typical high / low
74°23° / 51°11°
Wind
12 mph19 km/h
UV peak
4
Friday, Oct 30. Rain. High 67°19°, low 47°8°. Typical 73°23° / 51°11°. Rain 0.01 in0.3 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain and patchy fog. Partly sunny, with a high near 67.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–67°19°
Low, likely
44°7°–49°9°
Typical high / low
73°23° / 51°11°
Wind
8 mph13 km/h, gusts 16 mph25 km/h
UV peak
4
Saturday, Oct 31. Sunny. High 65°18°, low 44°7°. Typical 73°23° / 50°10°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
62°17°–70°21°
Low, likely
36°2°–48°9°
Typical high / low
73°23° / 50°10°
Wind
10 mph16 km/h, gusts 16 mph26 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 66°19°, low 44°7°. Typical 72°22° / 50°10°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 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°–71°22°
Low, likely
38°3°–46°8°
Typical high / low
72°22° / 50°10°
Wind
9 mph14 km/h, gusts 17 mph27 km/h
UV peak
4
Monday, Nov 2. Cloudy. High 67°19°, low 50°10°. Typical 72°22° / 50°10°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 61°16°
  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
63°17°–73°23°
Low, likely
45°7°–58°14°
Typical high / low
72°22° / 50°10°
Wind
6 mph10 km/h, gusts 16 mph25 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 73°, low 49°.
Tomorrow
Dry, high 76°, low 48°, warming up.
Monday
Dry, high 74°, low 46°.
Rest of week
Mostly dry, highs 65–71°.

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

7.1 mi

Action stage

Level: 169 ft

Reading from Sat 3:15 AM · NWS gauge page

Discovery Bay at Indian Slough

0.9 mi

Level: 5.3 ft

Reading from Sat 3:15 AM · NWS gauge page

Discovery Bay at Discovery Bay Island Bay Blvd

1.1 mi

Level: 5.2 ft

Reading from Sat 3:15 AM · NWS gauge page

Old River near Byron Ca (Old River at Hwy 4)

1.9 mi

Level: 4.6 ft

Reading from Sat 2 AM · NWS gauge page

For your home

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

Heating this week

About 1% less heating than a typical week.

This week 14Typical 14

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?

Tracy Pumping Plant · official normals 1991–2020 · records 1955–2026

Oct 24, today vs a typical year

Today’s expected high is 3°2° colder than typical.

Last 7 days vs normal

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

+6°+3°SunOct 18
+6°+3°MonOct 19
−5°−3°TueOct 20
—WedOct 21
−3°−2°ThuOct 22
−1°FriOct 23
—SatOct 24

Discovery Bay 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 21 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

Clear 5:09–6:57 AM, but the moon is 96% lit and up.

Moon

Waxing gibbous

96% lit · growing

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

Looking northeast from Discovery Bay. The highest point on the skyline is about 9,200 ft, 93 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Discovery Bay, CA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Marsh Creek Reservoir

Discovery Bay at Indian Slough

Discovery Bay at Discovery Bay Island Bay Blvd

Old River near Byron Ca (Old River at Hwy 4)

For your home

Heating this week

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