Observed 10:00 PM PDT at KCCR

Acalanes Ridge, CA weather

Clear and 55°13°.

Mostly agree

Now 55°13°

Clear

Wind: Calm; Up to 6 mph10 km/h through 10 AM
Dew point: 45°7°; Comfortable · down to 36°2° by 3 AM
UV tomorrow: 5Moderate; Moderate 11 AM–5 PM · peak 5
Air quality: 37Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.04 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

Low 49°9° tonight at 5 AM
Above 60°16° tomorrow by 11 AM
High 73°23° tomorrow at 3 PM
Below 60°16° tomorrow night after 9 PM

TonightDown to 49°9° by 5 AM · Clear
Tomorrow morningUp to 63°17° by 11 AM · Clear
Tomorrow afternoonUp to 73°23° by 3 PM · Clear
Tomorrow nightDown to 48°9° by 5 AM · Clear
Sunday morningUp to 63°17° by 11 AM · Mostly cloudy
Sunday afternoonUp to 75°24° by 4 PM · Mostly cloudy
Sunday nightDown to 60°16° by 9 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
Fri 10p	Clear	56°13° (likely 51°11° to 56°13°)	56°13°	0%	2 mph3 km/h from WSW, gusts 3 mph5 km/h	63%	0%	0
Fri 11p	Clear	55°13° (likely 50°10° to 55°13°)	55°13°	0%	2 mph3 km/h from SW, gusts 4 mph6 km/h	63%	0%	0
Sat 12a	Clear	54°12° (likely 50°10° to 54°12°)	54°12°	0%	2 mph3 km/h from WSW, gusts 5 mph8 km/h	61%	0%	0
Sat 1a	Clear	54°12° (likely 50°10° to 54°12°)	54°12°	0%	1 mph2 km/h from SW, gusts 4 mph7 km/h	58%	0%	0
Sat 2a	Clear	52°11° (likely 50°10° to 54°12°)	52°11°	0%	1 mph2 km/h from S, gusts 5 mph9 km/h	56%	0%	0
Sat 3a	Clear	51°11° (likely 49°9° to 54°12°)	51°11°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	55%	8%	0
Sat 4a	Clear	51°11° (likely 49°9° to 54°12°)	51°11°	0%	2 mph3 km/h from ESE, gusts 4 mph7 km/h	55%	13%	0
Sat 5a	Clear	49°9° (likely 48°9° to 53°12°)	49°9°	0%	2 mph3 km/h from ESE, gusts 5 mph7 km/h	54%	10%	0
Sat 6a	Clear	50°10° (likely 48°9° to 53°12°)	50°10°	0%	2 mph3 km/h from ESE, gusts 5 mph7 km/h	54%	0%	0
Sat 7a	Sunny	49°9° (likely 47°8° to 52°11°)	49°9°	0%	2 mph3 km/h from ENE, gusts 5 mph8 km/h	56%	0%	0
Sat 8a	Sunny	49°9° (likely 48°9° to 52°11°)	48°9°	0%	3 mph5 km/h from ENE, gusts 4 mph7 km/h	56%	0%	0
Sat 9a	Sunny	54°12° (likely 54°12° to 57°14°)	54°12°	0%	5 mph8 km/h from NE, gusts 4 mph6 km/h	53%	0%	1
Sat 10a	Sunny	59°15° (likely 58°14° to 62°17°)	59°15°	0%	6 mph10 km/h from NNE, gusts 6 mph10 km/h	49%	0%	2
Sat 11a	Sunny	63°17° (likely 61°16° to 65°18°)	63°17°	0%	7 mph11 km/h from NNE, gusts 11 mph18 km/h	43%	0%	3
Sat 12p	Sunny	67°19° (likely 64°18° to 67°19°)	67°19°	0%	6 mph10 km/h from NNE, gusts 13 mph21 km/h	41%	0%	4
Sat 1p	Sunny	69°21° (likely 67°19° to 69°21°)	69°21°	0%	6 mph10 km/h from NNE, gusts 12 mph19 km/h	39%	0%	5
Sat 2p	Sunny	71°22° (likely 68°20° to 71°22°)	71°22°	0%	5 mph8 km/h from NNE, gusts 10 mph17 km/h	37%	0%	5
Sat 3p	Sunny	73°23° (likely 69°21° to 73°23°)	73°23°	0%	3 mph5 km/h from NNE, gusts 8 mph14 km/h	35%	0%	4
Sat 4p	Sunny	73°23° (likely 69°21° to 73°23°)	73°23°	0%	2 mph3 km/h from NNE, gusts 8 mph12 km/h	34%	0%	3
Sat 5p	Sunny	73°23° (likely 67°19° to 73°23°)	73°23°	0%	2 mph3 km/h from N, gusts 6 mph9 km/h	34%	0%	2
Sat 6p	Clear	70°21° (likely 63°17° to 70°21°)	70°21°	0%	0 mph0 km/h, gusts 5 mph8 km/h	41%	28%	1
Sat 7p	Clear	64°18° (likely 59°15° to 64°18°)	64°18°	0%	0 mph0 km/h, gusts 6 mph10 km/h	48%	38%	0
Sat 8p	Clear	60°16° (likely 56°13° to 60°16°)	60°16°	0%	0 mph0 km/h, gusts 5 mph7 km/h	56%	10%	0
Sat 9p	Clear	58°14° (likely 53°12° to 58°14°)	58°14°	0%	0 mph0 km/h, gusts 4 mph6 km/h	58%	20%	0
Sat 10p	Clear	56°13° (likely 52°11° to 57°14°)	56°13°	0%	0 mph0 km/h, gusts 4 mph6 km/h	61%	10%	0
Sat 11p	Clear	55°13° (likely 50°10° to 55°13°)	55°13°	0%	0 mph0 km/h, gusts 5 mph8 km/h	64%	20%	0
Sun 12a	Clear	54°12° (likely 49°9° to 54°12°)	54°12°	0%	0 mph0 km/h, gusts 6 mph9 km/h	65%	14%	0
Sun 1a	Clear	53°12° (likely 49°9° to 54°12°)	53°12°	0%	0 mph0 km/h, gusts 5 mph8 km/h	67%	17%	0
Sun 2a	Clear	51°11° (likely 48°9° to 53°12°)	51°11°	0%	0 mph0 km/h, gusts 5 mph8 km/h	68%	0%	0
Sun 3a	Mostly clear	51°11° (likely 48°9° to 52°11°)	51°11°	0%	0 mph0 km/h, gusts 4 mph7 km/h	69%	10%	0
Sun 4a	Mostly clear	50°10° (likely 48°9° to 52°11°)	50°10°	0%	0 mph0 km/h, gusts 5 mph7 km/h	70%	34%	0
Sun 5a	Mostly clear	48°9° (likely 47°8° to 51°11°)	48°9°	0%	0 mph0 km/h, gusts 4 mph7 km/h	71%	57%	0
Sun 6a	Mostly clear	49°9° (likely 47°8° to 51°11°)	49°9°	0%	0 mph0 km/h, gusts 5 mph7 km/h	72%	65%	0
Sun 7a	Mostly sunny	48°9° (likely 46°8° to 50°10°)	48°9°	0%	0 mph0 km/h, gusts 5 mph7 km/h	75%	70%	0
Sun 8a	Mostly sunny	48°9° (likely 46°8° to 51°11°)	49°9°	0%	2 mph3 km/h from ENE, gusts 5 mph8 km/h	76%	54%	0
Sun 9a	Mostly sunny	52°11° (likely 50°10° to 55°13°)	52°11°	0%	2 mph3 km/h from ENE, gusts 6 mph9 km/h	72%	54%	1
Sun 10a	Cloudy	58°14° (likely 54°12° to 61°16°)	58°14°	0%	2 mph3 km/h from ENE, gusts 5 mph8 km/h	64%	69%	2
Sun 11a	Mostly sunny	63°17° (likely 58°14° to 65°18°)	63°17°	0%	3 mph5 km/h from ENE, gusts 5 mph8 km/h	56%	69%	3
Sun 12p	Mostly sunny	67°19° (likely 62°17° to 69°21°)	67°19°	0%	3 mph5 km/h from ENE, gusts 5 mph8 km/h	51%	68%	4
Sun 1p	Mostly sunny	70°21° (likely 66°19° to 71°22°)	70°21°	0%	3 mph5 km/h from ENE, gusts 6 mph9 km/h	47%	69%	4
Sun 2p	Partly sunny	72°22° (likely 68°20° to 72°22°)	72°22°	0%	3 mph5 km/h from NNW, gusts 7 mph12 km/h	44%	78%	4
Sun 3p	Cloudy	74°23° (likely 68°20° to 74°23°)	74°23°	0%	3 mph5 km/h from NNW, gusts 9 mph14 km/h	41%	81%	4
Sun 4p	Cloudy	75°24° (likely 66°19° to 75°24°)	75°24°	0%	3 mph5 km/h from NNW, gusts 9 mph15 km/h	39%	82%	3
Sun 5p	Cloudy	74°23° (likely 63°17° to 74°23°)	74°23°	0%	3 mph5 km/h from W, gusts 10 mph16 km/h	40%	84%	1
Sun 6p	Cloudy	71°22° (likely 60°16° to 71°22°)	71°22°	0%	3 mph5 km/h from W, gusts 9 mph14 km/h	46%	78%	0
Sun 7p	Partly cloudy	67°19° (likely 56°13° to 67°19°)	67°19°	0%	3 mph5 km/h from W, gusts 7 mph12 km/h	54%	74%	0
Sun 8p	Partly cloudy	64°18° (likely 54°12° to 64°18°)	64°18°	0%	2 mph3 km/h from WSW, gusts 6 mph10 km/h	61%	67%	0
Sun 9p	Partly cloudy	60°16° (likely 52°11° to 60°16°)	60°16°	0%	2 mph3 km/h from WSW, gusts 6 mph10 km/h	66%	36%	0

Days ahead

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

Today, Oct 23. Cloudy. High 68°20°, low 48°9°. Typical 70°21° / 50°10°. Dry. Mostly agree.
1. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 49°9°
  Dry
Official NWS forecast
Tonight: Clear, with a low around 48. South southwest wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–69°21°
Low, likely
48°9°–54°12°
Typical high / low
70°21° / 50°10°
Wind
9 mph15 km/h, gusts 20 mph33 km/h
UV peak
5
Tomorrow, Oct 24. Sunny. High 74°23°, low 47°8°. Typical 70°21° / 50°10°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Clear, 60°16°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 48°9°
  Dry
Official NWS forecast
Day: Sunny, with a high near 74. Northeast wind 2 to 7 mph.
Night: Clear, with a low around 47. Wind around 0 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
68°20°–74°23°
Low, likely
47°8°–52°11°
Typical high / low
70°21° / 50°10°
Wind
7 mph11 km/h, gusts 15 mph24 km/h
UV peak
5
Sunday, Oct 25. Mostly sunny. High 75°24°, low 49°9°. Typical 70°21° / 50°10°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 75°24°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 64°18°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  Dry
Official NWS forecast
Day: Sunny, with a high near 75. North northeast wind 0 to 3 mph.
Night: Mostly clear, with a low around 49. West southwest wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
68°20°–75°24°
Low, likely
45°7°–51°11°
Typical high / low
70°21° / 50°10°
Wind
8 mph13 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 70°21°, low 46°8°. Typical 70°21° / 49°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  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 70.
Night: Mostly clear, with a low around 46.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–70°21°
Low, likely
46°8°–51°11°
Typical high / low
70°21° / 49°9°
Wind
11 mph17 km/h, gusts 22 mph35 km/h
UV peak
5
Tuesday, Oct 27. Mostly sunny. High 69°21°, low 47°8°. Typical 70°21° / 49°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 54°12°
  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 69.
Night: Partly cloudy, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–69°21°
Low, likely
45°7°–50°10°
Typical high / low
70°21° / 49°9°
Wind
10 mph16 km/h, gusts 17 mph27 km/h
UV peak
5
Wednesday, Oct 28. Partly sunny. High 69°21°, low 48°9°. Typical 69°21° / 49°9°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 69.
Night: Partly cloudy, with a low around 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–69°21°
Low, likely
45°7°–50°10°
Typical high / low
69°21° / 49°9°
Wind
9 mph14 km/h, gusts 17 mph28 km/h
UV peak
4
Thursday, Oct 29. Cloudy. High 67°19°, low 48°9°. Typical 69°21° / 49°9°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°9°
  20% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 67.
Night: A slight chance of rain showers after 5am. Partly cloudy, with a low around 48.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
60°16°–67°19°
Low, likely
48°9°–50°10°
Typical high / low
69°21° / 49°9°
Wind
8 mph13 km/h, gusts 15 mph23 km/h
UV peak
4
Friday, Oct 30. Showers. High 66°19°, low 46°8°. Typical 69°21° / 49°9°. Rain 0.06 in1.5 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°9°
  20% chance · 0.02 in0.5 mm
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  30% chance · 0.03 in0.8 mm
3. Evening
  6 PM–midnight
  Mostly clear, 51°11°
  30% chance
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  20% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain showers before 7am, then patchy fog and a slight chance of rain showers. Mostly sunny, with a high near 66.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
56°13°–66°19°
Low, likely
43°6°–49°9°
Typical high / low
69°21° / 49°9°
Wind
7 mph11 km/h, gusts 18 mph29 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 63°17°, low 44°7°. Typical 68°20° / 48°9°. Rain 0.02 in0.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 46°8°
  30% chance
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  30% chance
3. Evening
  6 PM–midnight
  Clear, 54°12°
  30% chance
4. Overnight
  midnight–6 AM
  Partly cloudy, 46°8°
  20% chance
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
59°15°–69°21°
Low, likely
38°3°–48°9°
Typical high / low
68°20° / 48°9°
Wind
6 mph9 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 67°19°, low 46°8°. Typical 68°20° / 48°9°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 47°9°
  20% chance
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 59°15°
  20% chance
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°–72°22°
Low, likely
40°4°–50°10°
Typical high / low
68°20° / 48°9°
Wind
8 mph13 km/h, gusts 16 mph26 km/h
UV peak
4

10 days15 days30 days

The outlook

Today
Dry, high 68°, low 48°.
Tomorrow
Dry, high 74°, low 47°, warming up.
Sunday
Dry, high 75°, low 49°.
Rest of week
Mostly dry, highs 63–70°.

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

Walnut Creek at Ygnacio Valley Road

1.2 mi

Level: 0.3 ft

Reading from Fri 8:15 PM · NWS gauge page

Tice Creek at Rossmoor Basin

2.0 mi

Level: 0.3 ft

Reading from Fri 8:15 PM · NWS gauge page

Grayson Creek at Taylor Blvd (City Yard)

4.1 mi

Level: 0.1 ft

Reading from Fri 8:30 PM · NWS gauge page

Walnut Creek at Diamond Blvd Bridge

4.7 mi

Level: 2.1 ft

Reading from Fri 8:15 PM · 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 15Typical 38

Heating degree days, base 65°F

Comfort

Dry air outside (dew point 45°F).

Open the windows?

Sat, 11:00 AM–8:00 PM

Good stretch to open the windows.

Is this typical?

OAKLAND INTERNATIONAL AIRPORT · official normals 1991–2020 · records 1948–2026

Oct 23, today vs a typical year

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

Last 7 days vs normal

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

+7°+4°SatOct 17
−2°−1°SunOct 18
±0°MonOct 19
±0°TueOct 20
+1°±0°WedOct 21
±0°ThuOct 22
—FriOct 23

Acalanes Ridge weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 55 min; Losing 2 min 21 s a day; shortest Dec 21, 1 h 23 min less
Golden hour: 5:43–6:36 PM; Morning 7:08–8:01 AM
Blue hour: 6:36–6:46 PM; Morning 6:58–7:08 AM; first light 6:58 AM

Stars tonight? Good

Clear 10:19 PM–6:59 AM; moon 96% lit, sets 5:47 AM.

Moon

Waxing gibbous

95% lit · growing

Today: sets 4:40 AM · rises 4:52 PM
Full moon: Oct 25
New moon: Nov 8

Looking southeast from Acalanes Ridge. The highest point on the skyline is about 4,000 ft, 41 mi away.Skyline from USGS elevation data, heights drawn up to 5.5× taller. Sky, sun and moon as they are now.

Acalanes Ridge, CA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Sunday

Rest of week

What changed since yesterday

Radar

Rivers

Walnut Creek at Ygnacio Valley Road

Tice Creek at Rossmoor Basin

Grayson Creek at Taylor Blvd (City Yard)

Walnut Creek at Diamond Blvd Bridge

For your home

Heating this week

Comfort

Open the windows?

Is this typical?

Oct 23, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Good

Moon