What is the weather in Grand Coulee right now?

Current weather in Grand Coulee is scattered clouds.

Where can I find the hourly weather forecast for Grand Coulee?

This page shows hourly weather forecast for Grand Coulee, including temperature, wind, precipitation, humidity and cloud cover.

Is the weather forecast for Grand Coulee updated regularly?

Weather data for Grand Coulee is updated regularly with the latest available observations and forecasts.

Now · 11:43 AM

Grand Coulee Weather & Hourly Forecast

United States · Washington · 99133

66°F

Partly cloudy

Feels like: 60°F

💧 Humidity 45% 🌡 Pressure 30.00 inHg 💨 Wind 8 mph 👁 Visibility 23.7 mi ☁ Clouds 56% ☀️ UV index 3.3 · Moderate 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Grand Coulee

Today

12:00 PM

Partly cloudy

66° 💧 0.000 in 💨 8 mph H 45%30.00 inHg

3:00 PM

Overcast

69° 💧 0.000 in 💨 8 mph H 35%29.97 inHg

6:00 PM

Overcast

68° 💧 None 💨 6 mph H 37%30.00 inHg

9:00 PM

Overcast night

61° 💧 0.003 in 💨 4 mph H 59%30.09 inHg

Tomorrow

12:00 AM

Overcast night

58° 💧 0.019 in 💨 2 mph H 76%30.09 inHg

3:00 AM

Mostly cloudy night

56° 💧 0.000 in 💨 2 mph H 88%30.12 inHg

6:00 AM

Partly cloudy night

54° 💧 None 💨 1 mph H 90%30.15 inHg

9:00 AM

Sunny

59° 💧 None 💨 2 mph H 77%30.21 inHg

12:00 PM

Sunny

67° 💧 None 💨 3 mph H 49%30.21 inHg

3:00 PM

Sunny

72° 💧 None 💨 6 mph H 37%30.18 inHg

6:00 PM

Sunny

71° 💧 None 💨 7 mph H 37%30.15 inHg

9:00 PM

Clear night

63° 💧 None 💨 4 mph H 58%30.21 inHg

Wednesday

12:00 AM

Clear night

59° 💧 None 💨 2 mph H 69%30.21 inHg

3:00 AM

Clear night

55° 💧 None 💨 2 mph H 87%30.21 inHg

6:00 AM

Mostly clear night

53° 💧 None 💨 1 mph H 86%30.21 inHg

9:00 AM

Mostly sunny

62° 💧 None 💨 3 mph H 69%30.24 inHg

Today

12:00 PM

Partly cloudy

66° 💧 None 💨 8 mph H 45%30.00 inHg

1:00 PM

Overcast

68° 💧 0.000 in 💨 8 mph H 39%29.97 inHg

2:00 PM

Overcast

69° 💧 0.000 in 💨 8 mph H 36%29.97 inHg

3:00 PM

Overcast

69° 💧 0.000 in 💨 8 mph H 35%29.97 inHg

4:00 PM

Overcast

69° 💧 None 💨 8 mph H 35%29.97 inHg

5:00 PM

Overcast

68° 💧 None 💨 8 mph H 36%30.00 inHg

6:00 PM

Overcast

68° 💧 None 💨 6 mph H 37%30.00 inHg

7:00 PM

Overcast

65° 💧 None 💨 2 mph H 50%30.00 inHg

8:00 PM

Overcast night

63° 💧 None 💨 7 mph H 51%30.03 inHg

9:00 PM

Overcast night

61° 💧 0.000 in 💨 4 mph H 59%30.09 inHg

10:00 PM

Overcast night

60° 💧 0.002 in 💨 2 mph H 68%30.09 inHg

11:00 PM

Overcast night

59° 💧 0.000 in 💨 1 mph H 72%30.09 inHg

Tomorrow

12:00 AM

Overcast night

58° 💧 0.004 in 💨 2 mph H 76%30.09 inHg

1:00 AM

Light rain

57° 💧 0.009 in 💨 2 mph H 81%30.12 inHg

2:00 AM

Light rain

56° 💧 0.006 in 💨 2 mph H 85%30.12 inHg

3:00 AM

Mostly cloudy night

56° 💧 0.000 in 💨 2 mph H 88%30.12 inHg

4:00 AM

Mostly cloudy night

55° 💧 None 💨 1 mph H 89%30.15 inHg

5:00 AM

Overcast night

54° 💧 None 💨 1 mph H 89%30.15 inHg

6:00 AM

Partly cloudy night

54° 💧 None 💨 1 mph H 90%30.15 inHg

7:00 AM

Mostly sunny

54° 💧 None 💨 1 mph H 93%30.18 inHg

8:00 AM

Sunny

56° 💧 None 💨 2 mph H 88%30.21 inHg

9:00 AM

Sunny

59° 💧 None 💨 2 mph H 77%30.21 inHg

10:00 AM

Sunny

62° 💧 None 💨 2 mph H 63%30.21 inHg

11:00 AM

Sunny

65° 💧 None 💨 2 mph H 55%30.21 inHg

12:00 PM

Sunny

67° 💧 None 💨 3 mph H 49%30.21 inHg

1:00 PM

Sunny

69° 💧 None 💨 4 mph H 44%30.21 inHg

2:00 PM

Sunny

71° 💧 None 💨 5 mph H 40%30.18 inHg

3:00 PM

Sunny

72° 💧 None 💨 6 mph H 37%30.18 inHg

4:00 PM

Sunny

73° 💧 None 💨 7 mph H 35%30.18 inHg

5:00 PM

Sunny

72° 💧 None 💨 7 mph H 35%30.18 inHg

6:00 PM

Sunny

71° 💧 None 💨 7 mph H 37%30.15 inHg

7:00 PM

Sunny

68° 💧 None 💨 4 mph H 48%30.15 inHg

8:00 PM

Clear night

65° 💧 None 💨 4 mph H 55%30.18 inHg

9:00 PM

Clear night

63° 💧 None 💨 4 mph H 58%30.21 inHg

10:00 PM

Clear night

61° 💧 None 💨 3 mph H 62%30.21 inHg

11:00 PM

Clear night

60° 💧 None 💨 3 mph H 64%30.21 inHg

Wednesday

12:00 AM

Clear night

59° 💧 None 💨 2 mph H 69%30.21 inHg

1:00 AM

Mostly clear night

57° 💧 None 💨 2 mph H 75%30.21 inHg

2:00 AM

Clear night

56° 💧 None 💨 2 mph H 81%30.21 inHg

3:00 AM

Clear night

55° 💧 None 💨 2 mph H 87%30.21 inHg

4:00 AM

Mostly clear night

54° 💧 None 💨 1 mph H 86%30.21 inHg

5:00 AM

Mostly clear night

54° 💧 None 💨 1 mph H 88%30.21 inHg

6:00 AM

Mostly clear night

53° 💧 None 💨 1 mph H 86%30.21 inHg

7:00 AM

Mostly sunny

54° 💧 None 💨 1 mph H 87%30.24 inHg

8:00 AM

Mostly sunny

58° 💧 None 💨 3 mph H 81%30.24 inHg

9:00 AM

Mostly sunny

62° 💧 None 💨 3 mph H 69%30.24 inHg

10:00 AM

Partly cloudy

66° 💧 None 💨 3 mph H 52%30.24 inHg

11:00 AM

Partly cloudy

70° 💧 None 💨 6 mph H 41%30.21 inHg

12:00 PM

Mostly cloudy

73° 💧 None 💨 7 mph H 37%30.21 inHg

1:00 PM

Mostly cloudy

74° 💧 None 💨 8 mph H 34%30.18 inHg

2:00 PM

Mostly cloudy

75° 💧 None 💨 9 mph H 33%30.15 inHg

3:00 PM

Mostly cloudy

76° 💧 None 💨 9 mph H 32%30.12 inHg

4:00 PM

Mostly cloudy

76° 💧 None 💨 9 mph H 31%30.09 inHg

5:00 PM

Mostly cloudy

76° 💧 None 💨 8 mph H 31%30.06 inHg

6:00 PM

Mostly cloudy

75° 💧 None 💨 8 mph H 32%30.03 inHg

7:00 PM

Mostly cloudy

72° 💧 None 💨 6 mph H 38%30.00 inHg

8:00 PM

Partly cloudy night

68° 💧 None 💨 6 mph H 40%30.00 inHg

9:00 PM

Partly cloudy night

67° 💧 None 💨 6 mph H 41%30.00 inHg

10:00 PM

Partly cloudy night

65° 💧 None 💨 6 mph H 44%29.97 inHg

11:00 PM

Mostly cloudy night

64° 💧 None 💨 5 mph H 47%29.94 inHg

Thursday

12:00 AM

Mostly cloudy night

63° 💧 None 💨 3 mph H 54%29.94 inHg

1:00 AM

Mostly cloudy night

61° 💧 None 💨 3 mph H 60%29.94 inHg

2:00 AM

Overcast night

61° 💧 None 💨 3 mph H 63%29.91 inHg

3:00 AM

Overcast night

61° 💧 None 💨 2 mph H 65%29.91 inHg

4:00 AM

Mostly cloudy night

60° 💧 None 💨 2 mph H 69%29.91 inHg

5:00 AM

Overcast night

60° 💧 0.000 in 💨 1 mph H 71%29.88 inHg

8:00 AM

Partly cloudy

62° 💧 None 💨 2 mph H 61%29.88 inHg

11:00 AM

Sunny

72° 💧 None 💨 7 mph H 38%29.85 inHg

2:00 PM

Sunny

77° 💧 None 💨 10 mph H 27%29.77 inHg

5:00 PM

Sunny

77° 💧 None 💨 11 mph H 21%29.71 inHg

8:00 PM

Clear night

68° 💧 None 💨 12 mph H 29%29.74 inHg

11:00 PM

Clear night

61° 💧 None 💨 11 mph H 41%29.83 inHg

Friday

2:00 AM

Clear night

56° 💧 None 💨 7 mph H 49%29.88 inHg

5:00 AM

Clear night

52° 💧 None 💨 4 mph H 61%29.94 inHg

8:00 AM

Mostly cloudy

53° 💧 None 💨 2 mph H 64%29.97 inHg

11:00 AM

Mostly cloudy

63° 💧 None 💨 3 mph H 38%29.97 inHg

2:00 PM

Mostly cloudy

69° 💧 None 💨 4 mph H 27%29.94 inHg

5:00 PM

Partly cloudy

69° 💧 None 💨 6 mph H 29%29.88 inHg

8:00 PM

Mostly cloudy night

64° 💧 None 💨 5 mph H 38%29.88 inHg

11:00 PM

Overcast night

59° 💧 None 💨 2 mph H 52%29.88 inHg

Saturday

2:00 AM

Mostly cloudy night

55° 💧 None 💨 2 mph H 67%29.83 inHg

5:00 AM

Mostly cloudy night

52° 💧 None 💨 2 mph H 72%29.80 inHg

8:00 AM

Mostly sunny

55° 💧 None 💨 3 mph H 63%29.80 inHg

11:00 AM

Light rain

64° 💧 None 💨 6 mph H 43%29.80 inHg

2:00 PM

Heavy rain

55° 💧 None 💨 6 mph H 76%29.85 inHg

5:00 PM

Mostly cloudy

56° 💧 None 💨 6 mph H 76%29.85 inHg

8:00 PM

Light rain

52° 💧 None 💨 4 mph H 89%29.91 inHg

11:00 PM

Light rain

50° 💧 None 💨 2 mph H 94%29.97 inHg

Sunday

5:00 AM

Mostly cloudy night

52° 💧 None 💨 3 mph H 88%30.03 inHg

11:00 AM

Partly cloudy

48° 💧 None 💨 0 mph H 93%30.09 inHg

5:00 PM

Partly cloudy

58° 💧 None 💨 1 mph H 64%30.12 inHg

11:00 PM

Clear night

66° 💧 None 💨 3 mph H 37%30.06 inHg

Monday

5:00 AM

Clear night

55° 💧 None 💨 3 mph H 76%30.15 inHg

11:00 AM

Sunny

49° 💧 None 💨 1 mph H 95%30.18 inHg

5:00 PM

Sunny

61° 💧 None 💨 5 mph H 58%30.21 inHg

11:00 PM

Clear night

70° 💧 None 💨 2 mph H 33%30.09 inHg

Tuesday

5:00 AM

Clear night

58° 💧 None 💨 1 mph H 67%30.12 inHg

11:00 AM

Sunny

48° 💧 None 💨 1 mph H 89%30.12 inHg

5:00 PM

Sunny

67° 💧 None 💨 2 mph H 44%30.12 inHg

11:00 PM

Clear night

74° 💧 None 💨 7 mph H 27%30.00 inHg

Wednesday

5:00 AM

Clear night

57° 💧 None 💨 2 mph H 66%30.00 inHg

11:00 AM

Partly cloudy

49° 💧 None 💨 2 mph H 86%30.00 inHg

5:00 PM

Sunny

69° 💧 None 💨 5 mph H 37%30.06 inHg

11:00 PM

Mostly cloudy night

76° 💧 None 💨 10 mph H 28%29.97 inHg

Thursday

5:00 AM

Partly cloudy night

59° 💧 None 💨 3 mph H 58%30.06 inHg

11:00 AM

Mostly sunny

51° 💧 None 💨 3 mph H 71%30.12 inHg

5:00 PM

Sunny

69° 💧 None 💨 2 mph H 33%30.18 inHg

11:00 PM

Clear night

79° 💧 None 💨 6 mph H 24%30.06 inHg

Friday

5:00 AM

Clear night

67° 💧 None 💨 0 mph H 46%30.12 inHg

11:00 AM

Mostly sunny

53° 💧 None 💨 1 mph H 80%30.12 inHg

5:00 PM

Overcast

73° 💧 None 💨 2 mph H 33%30.12 inHg

11:00 PM

Mostly cloudy night

84° 💧 None 💨 1 mph H 24%30.00 inHg

Saturday

5:00 AM

Clear night

67° 💧 None 💨 2 mph H 68%30.03 inHg

11:00 AM

Sunny

58° 💧 None 💨 1 mph H 91%30.03 inHg

5:00 PM

Sunny

76° 💧 None 💨 2 mph H 40%30.03 inHg

11:00 PM

Clear night

85° 💧 None 💨 4 mph H 25%29.91 inHg

Sunday

5:00 AM

Clear night

71° 💧 None 💨 1 mph H 45%29.94 inHg

11:00 AM

Sunny

58° 💧 None 💨 2 mph H 74%29.97 inHg

5:00 PM

Mostly sunny

77° 💧 None 💨 1 mph H 31%30.00 inHg

11:00 PM

Partly cloudy night

87° 💧 None 💨 3 mph H 23%29.85 inHg

Monday

5:00 AM

Mostly cloudy night

73° 💧 None 💨 1 mph H 38%29.85 inHg

11:00 AM

Mostly cloudy

63° 💧 None 💨 1 mph H 63%29.85 inHg

5:00 PM

Mostly cloudy

76° 💧 None 💨 6 mph H 26%29.85 inHg

11:00 PM

Partly cloudy night

83° 💧 None 💨 11 mph H 17%29.77 inHg

In Grand Coulee and, more broadly, across the state of Washington: The rest of the day will feature mostly cloudy skies, with temperatures ranging from 48 to 58 degrees Fahrenheit. Conditions will remain cool but dry, with no significant rainfall expected. Winds will be light, coming from the northwest at around 7 mph, with gusts reaching up to 10 mph. Overall, it should be a relatively calm and cool afternoon under mostly cloudy conditions.

15-Day Weather Outlook for Grand Coulee

TomorrowTomorrow

Overcast 72°/52° 💧 None 💨 6 mph

Wednesday, Sep 9Wed Sep 9

Mostly sunny 76°/54° 💧 None 💨 8 mph

Thursday, Sep 10Thu Sep 10

Partly cloudy 77°/60° 💧 0.001 in 💨 10 mph

Friday, Sep 11Fri Sep 11

Mostly cloudy 77°/52° 💧 None 💨 12 mph

Saturday, Sep 12Sat Sep 12

Heavy rain 69°/52° 💧 0.150 in 💨 6 mph

Sunday, Sep 13Sun Sep 13

Light rain 56°/48° 💧 0.456 in 💨 6 mph

Monday, Sep 14Mon Sep 14

Partly cloudy 66°/49° 💧 0.003 in 💨 3 mph

Tuesday, Sep 15Tue Sep 15

Sunny 70°/48° 💧 None 💨 5 mph

Wednesday, Sep 16Wed Sep 16

Partly cloudy 74°/49° 💧 None 💨 7 mph

Thursday, Sep 17Thu Sep 17

Mostly cloudy 76°/51° 💧 None 💨 10 mph

Friday, Sep 18Fri Sep 18

Mostly sunny 79°/53° 💧 None 💨 6 mph

Saturday, Sep 19Sat Sep 19

Overcast 84°/58° 💧 0.019 in 💨 2 mph

Sunday, Sep 20Sun Sep 20

Sunny 85°/58° 💧 None 💨 4 mph

Monday, Sep 21Mon Sep 21

Mostly sunny 87°/63° 💧 None 💨 3 mph

Tuesday, Sep 22Tue Sep 22

Mostly cloudy 83°/76° 💧 None 💨 11 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Grand Coulee

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Grand Coulee

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 12:00 PM

PM2.5 Fine particles Good 1,4µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 2,0µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Fair 89,3µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 0,6µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is acceptable for most people.

UV & HEALTH

UV, Sun & Health Outlook in Grand Coulee

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 4,9Moderate 🙂Fair

Tomorrow UV 5,2Moderate 🙂Fair

Wednesday UV 5,6Moderate 😐Moderate

Thursday UV 4,9Moderate 🙂Fair

Friday UV 4,0Moderate 🙂Fair

Saturday UV 4,0Moderate —Unavailable

Sunday UV 5,0Moderate —Unavailable

Hourly UV index today

12:00 PMUV 4,4 1:00 PMUV 4,9 2:00 PMUV 4,5 3:00 PMUV 3,3 4:00 PMUV 1,9 5:00 PMUV 1,0 6:00 PMUV 0,3 7:00 PMUV 0,0

Today's weather health advice Open today's recommendations.

Moderate UV risk

Sunglasses and sun protection are recommended for prolonged exposure.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged exertion.

Comfortable temperature conditions

Temperatures should feel comfortable for most people, with no particular heat or cold precautions needed.

Good conditions for outdoor activities

Outdoor activities can generally be enjoyed normally, with sun protection adjusted to the UV level.

WIND OUTLOOK

Hourly Wind Forecast for Grand Coulee

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · GRAND COULEE, WASHINGTON

Tonight's Stargazing & Shooting Stars

Fair observing conditions. Best local viewing window: 3:00 AM–4:00 AM.

50/100Best-hour score

BEST TIME TONIGHT 3:00 AM–4:00 AM Astronomical darkness: 9:14 PM–4:34 AM

☁ Cloud cover 67% Real hourly forecast for the best viewing hour.

☾ Moonlight 13% Waning Crescent · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 67° high at the best hour.

✦ Estimated visible meteors 1–3/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min54%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 5–SEP 21

September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak

ACTIVE NOW

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

UPCOMING

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

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Forecast data for Grand Coulee were last refreshed today at 11:43 AM. The current forecast period extends through 09/09/2026 at 9:00 AM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.