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Current weather in Grand Coulee is clear sky.

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

Now · 1:41 PM

Grand Coulee Weather & Hourly Forecast

United States · Washington · 99133

75°F

Sunny

Feels like: 69°F

💧 Humidity 27% 🌡 Pressure 29.85 inHg 💨 Wind 6 mph 👁 Visibility 29.1 mi ☁ Clouds 0% ☀️ UV index 4.1 · Moderate 🌅 Sunrise 6:41 AM 🌇 Sunset 6:55 PM

Hourly Forecast for Grand Coulee

Today

2:00 PM

Sunny

75° 💧 None 💨 6 mph H 27%29.85 inHg

5:00 PM

Sunny

76° 💧 None 💨 10 mph H 21%29.83 inHg

8:00 PM

Clear night

66° 💧 None 💨 6 mph H 35%29.85 inHg

11:00 PM

Partly cloudy night

59° 💧 None 💨 5 mph H 55%29.91 inHg

Tomorrow

2:00 AM

Mostly cloudy night

55° 💧 None 💨 4 mph H 68%29.94 inHg

5:00 AM

Overcast night

52° 💧 None 💨 4 mph H 78%29.97 inHg

8:00 AM

Mostly cloudy

52° 💧 None 💨 3 mph H 72%30.03 inHg

11:00 AM

Overcast

60° 💧 None 💨 3 mph H 51%30.06 inHg

2:00 PM

Overcast

66° 💧 None 💨 5 mph H 34%30.03 inHg

5:00 PM

Sunny

69° 💧 None 💨 5 mph H 29%30.00 inHg

8:00 PM

Clear night

61° 💧 None 💨 4 mph H 42%30.00 inHg

11:00 PM

Mostly clear night

57° 💧 None 💨 2 mph H 53%30.00 inHg

Thursday

2:00 AM

Mostly cloudy night

54° 💧 None 💨 1 mph H 72%30.00 inHg

5:00 AM

Mostly cloudy night

53° 💧 None 💨 1 mph H 83%29.97 inHg

8:00 AM

Overcast

54° 💧 None 💨 2 mph H 86%29.97 inHg

11:00 AM

Mostly cloudy

63° 💧 None 💨 4 mph H 40%29.94 inHg

Today

2:00 PM

Sunny

75° 💧 None 💨 6 mph H 27%29.85 inHg

3:00 PM

Sunny

76° 💧 None 💨 7 mph H 24%29.83 inHg

4:00 PM

Sunny

76° 💧 None 💨 8 mph H 23%29.83 inHg

5:00 PM

Sunny

76° 💧 None 💨 10 mph H 21%29.83 inHg

6:00 PM

Sunny

74° 💧 None 💨 10 mph H 23%29.83 inHg

7:00 PM

Clear night

69° 💧 None 💨 6 mph H 29%29.83 inHg

8:00 PM

Clear night

66° 💧 None 💨 6 mph H 35%29.85 inHg

9:00 PM

Clear night

63° 💧 None 💨 6 mph H 41%29.88 inHg

10:00 PM

Clear night

60° 💧 None 💨 4 mph H 50%29.91 inHg

11:00 PM

Partly cloudy night

59° 💧 None 💨 5 mph H 55%29.91 inHg

Tomorrow

12:00 AM

Mostly cloudy night

58° 💧 None 💨 5 mph H 59%29.94 inHg

1:00 AM

Mostly cloudy night

56° 💧 None 💨 4 mph H 64%29.94 inHg

2:00 AM

Mostly cloudy night

55° 💧 None 💨 4 mph H 68%29.94 inHg

3:00 AM

Mostly cloudy night

53° 💧 None 💨 4 mph H 72%29.97 inHg

4:00 AM

Mostly cloudy night

52° 💧 None 💨 4 mph H 75%29.97 inHg

5:00 AM

Overcast night

52° 💧 None 💨 4 mph H 78%29.97 inHg

6:00 AM

Mostly cloudy night

51° 💧 None 💨 3 mph H 80%30.00 inHg

7:00 AM

Mostly cloudy

50° 💧 None 💨 3 mph H 82%30.03 inHg

8:00 AM

Mostly cloudy

52° 💧 None 💨 3 mph H 72%30.03 inHg

9:00 AM

Mostly cloudy

54° 💧 None 💨 3 mph H 65%30.06 inHg

10:00 AM

Mostly cloudy

57° 💧 None 💨 3 mph H 58%30.06 inHg

11:00 AM

Overcast

60° 💧 None 💨 3 mph H 51%30.06 inHg

12:00 PM

Overcast

64° 💧 None 💨 3 mph H 42%30.06 inHg

1:00 PM

Overcast

66° 💧 None 💨 4 mph H 35%30.03 inHg

2:00 PM

Overcast

66° 💧 None 💨 5 mph H 34%30.03 inHg

3:00 PM

Mostly sunny

68° 💧 None 💨 5 mph H 31%30.00 inHg

4:00 PM

Sunny

69° 💧 None 💨 5 mph H 29%30.00 inHg

5:00 PM

Sunny

69° 💧 None 💨 5 mph H 29%30.00 inHg

6:00 PM

Mostly sunny

67° 💧 None 💨 6 mph H 30%29.97 inHg

7:00 PM

Mostly clear night

63° 💧 None 💨 4 mph H 37%29.97 inHg

8:00 PM

Clear night

61° 💧 None 💨 4 mph H 42%30.00 inHg

9:00 PM

Clear night

59° 💧 None 💨 3 mph H 46%30.00 inHg

10:00 PM

Partly cloudy night

58° 💧 None 💨 2 mph H 50%30.00 inHg

11:00 PM

Mostly clear night

57° 💧 None 💨 2 mph H 53%30.00 inHg

Thursday

12:00 AM

Mostly clear night

56° 💧 None 💨 1 mph H 57%30.00 inHg

1:00 AM

Partly cloudy night

55° 💧 None 💨 1 mph H 64%30.00 inHg

2:00 AM

Mostly cloudy night

54° 💧 None 💨 1 mph H 72%30.00 inHg

3:00 AM

Overcast night

53° 💧 None 💨 1 mph H 79%30.00 inHg

4:00 AM

Overcast night

53° 💧 None 💨 1 mph H 81%29.97 inHg

5:00 AM

Mostly cloudy night

53° 💧 None 💨 1 mph H 83%29.97 inHg

6:00 AM

Overcast night

52° 💧 None 💨 1 mph H 88%29.97 inHg

7:00 AM

Mostly cloudy

52° 💧 None 💨 2 mph H 92%29.97 inHg

8:00 AM

Overcast

54° 💧 None 💨 2 mph H 86%29.97 inHg

9:00 AM

Overcast

56° 💧 None 💨 2 mph H 75%29.97 inHg

10:00 AM

Overcast

60° 💧 None 💨 3 mph H 51%29.97 inHg

11:00 AM

Mostly cloudy

63° 💧 None 💨 4 mph H 40%29.94 inHg

12:00 PM

Overcast

67° 💧 None 💨 4 mph H 32%29.91 inHg

1:00 PM

Overcast

70° 💧 None 💨 4 mph H 29%29.88 inHg

2:00 PM

Overcast

71° 💧 None 💨 3 mph H 27%29.85 inHg

3:00 PM

Overcast

72° 💧 None 💨 3 mph H 26%29.80 inHg

4:00 PM

Overcast

74° 💧 None 💨 2 mph H 26%29.80 inHg

5:00 PM

Overcast

73° 💧 None 💨 2 mph H 27%29.77 inHg

6:00 PM

Mostly cloudy

72° 💧 None 💨 4 mph H 28%29.74 inHg

7:00 PM

Mostly cloudy night

68° 💧 None 💨 2 mph H 36%29.74 inHg

8:00 PM

Mostly cloudy night

66° 💧 None 💨 1 mph H 41%29.74 inHg

9:00 PM

Mostly cloudy night

65° 💧 None 💨 1 mph H 46%29.74 inHg

10:00 PM

Overcast night

64° 💧 None 💨 0 mph H 45%29.74 inHg

11:00 PM

Overcast night

63° 💧 None 💨 2 mph H 53%29.74 inHg

Friday

12:00 AM

Overcast night

62° 💧 None 💨 2 mph H 61%29.71 inHg

1:00 AM

Overcast night

61° 💧 0.001 in 💨 3 mph H 68%29.71 inHg

2:00 AM

Overcast night

60° 💧 0.001 in 💨 2 mph H 71%29.74 inHg

3:00 AM

Overcast night

59° 💧 None 💨 1 mph H 72%29.74 inHg

4:00 AM

Overcast night

60° 💧 None 💨 1 mph H 71%29.74 inHg

5:00 AM

Light rain

59° 💧 0.020 in 💨 3 mph H 73%29.74 inHg

8:00 AM

Moderate rain

56° 💧 None 💨 4 mph H 85%29.77 inHg

11:00 AM

Overcast

58° 💧 None 💨 9 mph H 76%29.77 inHg

2:00 PM

Light rain

60° 💧 None 💨 14 mph H 67%29.74 inHg

5:00 PM

Light rain

54° 💧 None 💨 10 mph H 84%29.74 inHg

8:00 PM

Moderate rain

50° 💧 None 💨 14 mph H 86%29.85 inHg

11:00 PM

Light rain

49° 💧 None 💨 12 mph H 84%29.91 inHg

Saturday

2:00 AM

Mostly clear night

48° 💧 None 💨 7 mph H 80%29.97 inHg

5:00 AM

Mostly clear night

46° 💧 None 💨 3 mph H 83%30.03 inHg

8:00 AM

Mostly sunny

48° 💧 None 💨 2 mph H 77%30.06 inHg

11:00 AM

Mostly sunny

55° 💧 None 💨 3 mph H 64%30.09 inHg

2:00 PM

Mostly sunny

59° 💧 None 💨 6 mph H 50%30.06 inHg

5:00 PM

Mostly cloudy

60° 💧 None 💨 6 mph H 44%30.03 inHg

8:00 PM

Clear night

54° 💧 None 💨 1 mph H 63%30.03 inHg

11:00 PM

Mostly clear night

49° 💧 None 💨 1 mph H 81%30.06 inHg

Sunday

2:00 AM

Mostly clear night

45° 💧 None 💨 1 mph H 96%30.09 inHg

5:00 AM

Overcast night

42° 💧 None 💨 1 mph H 98%30.09 inHg

8:00 AM

Mostly cloudy

43° 💧 None 💨 2 mph H 92%30.09 inHg

11:00 AM

Overcast

53° 💧 None 💨 3 mph H 70%30.09 inHg

2:00 PM

Overcast

59° 💧 None 💨 4 mph H 48%30.03 inHg

5:00 PM

Mostly sunny

60° 💧 None 💨 4 mph H 43%29.97 inHg

8:00 PM

Clear night

54° 💧 None 💨 0 mph H 60%29.97 inHg

11:00 PM

Clear night

49° 💧 None 💨 0 mph H 70%30.00 inHg

Monday

2:00 AM

Clear night

43° 💧 None 💨 1 mph H 88%30.00 inHg

5:00 AM

Clear night

40° 💧 None 💨 1 mph H 86%30.00 inHg

11:00 AM

Overcast

54° 💧 None 💨 1 mph H 53%30.03 inHg

5:00 PM

Mostly cloudy

61° 💧 None 💨 5 mph H 37%29.88 inHg

11:00 PM

Partly cloudy night

54° 💧 None 💨 1 mph H 66%29.88 inHg

Tuesday

5:00 AM

Mostly cloudy night

49° 💧 None 💨 2 mph H 83%29.83 inHg

11:00 AM

Overcast

58° 💧 None 💨 7 mph H 54%29.83 inHg

5:00 PM

Overcast

60° 💧 None 💨 8 mph H 43%29.71 inHg

11:00 PM

Overcast night

52° 💧 None 💨 1 mph H 65%29.71 inHg

Wednesday

5:00 AM

Clear night

47° 💧 None 💨 5 mph H 89%29.77 inHg

11:00 AM

Sunny

55° 💧 None 💨 9 mph H 59%29.85 inHg

5:00 PM

Sunny

59° 💧 None 💨 12 mph H 33%29.88 inHg

11:00 PM

Clear night

46° 💧 None 💨 5 mph H 58%30.03 inHg

Thursday

5:00 AM

Clear night

41° 💧 None 💨 1 mph H 76%30.18 inHg

11:00 AM

Mostly sunny

51° 💧 None 💨 2 mph H 60%30.27 inHg

5:00 PM

Partly cloudy

59° 💧 None 💨 2 mph H 38%30.21 inHg

11:00 PM

Mostly cloudy night

49° 💧 None 💨 1 mph H 70%30.24 inHg

Friday

5:00 AM

Clear night

39° 💧 None 💨 1 mph H 97%30.24 inHg

11:00 AM

Mostly cloudy

54° 💧 None 💨 1 mph H 54%30.24 inHg

5:00 PM

Mostly sunny

62° 💧 None 💨 1 mph H 33%30.09 inHg

11:00 PM

Mostly clear night

50° 💧 None 💨 1 mph H 72%30.06 inHg

Saturday

5:00 AM

Mostly cloudy night

42° 💧 None 💨 1 mph H 94%30.00 inHg

11:00 AM

Partly cloudy

58° 💧 None 💨 4 mph H 51%29.97 inHg

5:00 PM

Sunny

64° 💧 None 💨 10 mph H 36%29.85 inHg

11:00 PM

Clear night

48° 💧 None 💨 4 mph H 60%29.97 inHg

Sunday

5:00 AM

Clear night

39° 💧 None 💨 1 mph H 83%30.00 inHg

11:00 AM

Sunny

53° 💧 None 💨 4 mph H 51%30.03 inHg

5:00 PM

Sunny

59° 💧 None 💨 10 mph H 37%29.91 inHg

11:00 PM

Clear night

45° 💧 None 💨 3 mph H 72%29.97 inHg

Monday

5:00 AM

Clear night

38° 💧 None 💨 2 mph H 84%30.03 inHg

11:00 AM

Sunny

54° 💧 None 💨 7 mph H 50%30.06 inHg

5:00 PM

Mostly sunny

61° 💧 None 💨 8 mph H 27%30.03 inHg

11:00 PM

Clear night

45° 💧 None 💨 3 mph H 69%30.15 inHg

Tuesday

5:00 AM

Clear night

41° 💧 None 💨 1 mph H 74%30.21 inHg

11:00 AM

Sunny

55° 💧 None 💨 3 mph H 45%30.24 inHg

5:00 PM

Sunny

59° 💧 None 💨 6 mph H 35%30.15 inHg

11:00 PM

Mostly clear night

49° 💧 None 💨 1 mph H 64%30.18 inHg

Wednesday

5:00 AM

Clear night

39° 💧 None 💨 1 mph H 95%30.24 inHg

In Grand Coulee and, more broadly, across the state of Washington: Clear skies will persist into the evening, with temperatures remaining mild between 58 and 67 degrees Fahrenheit. Light eastward winds are expected, averaging around 2 mph, with occasional gusts reaching up to 9 mph. No precipitation is anticipated during the next few hours, providing a calm and dry evening. Temperatures will gradually cool as the night progresses, but conditions should remain comfortable and clear through the late evening and into the early morning hours.

15-Day Weather Outlook for Grand Coulee

TomorrowTomorrow

Mostly cloudy 69°/50° 💧 None 💨 6 mph

Thursday, Sep 24Thu Sep 24

Mostly sunny 74°/52° 💧 None 💨 4 mph

Friday, Sep 25Fri Sep 25

Moderate rain 62°/51° 💧 0.675 in 💨 10 mph

Saturday, Sep 26Sat Sep 26

Mostly sunny 60°/46° 💧 0.004 in 💨 6 mph

Sunday, Sep 27Sun Sep 27

Overcast 59°/44° 💧 None 💨 5 mph

Monday, Sep 28Mon Sep 28

Partly cloudy 64°/41° 💧 None 💨 5 mph

Tuesday, Sep 29Tue Sep 29

Mostly cloudy 63°/48° 💧 None 💨 6 mph

Wednesday, Sep 30Wed Sep 30

Light rain 64°/52° 💧 0.048 in 💨 5 mph

Thursday, Oct 1Thu Oct 1

Overcast 63°/50° 💧 None 💨 6 mph

Friday, Oct 2Fri Oct 2

Mostly cloudy 63°/44° 💧 None 💨 6 mph

Saturday, Oct 3Sat Oct 3

Mostly sunny 64°/44° 💧 None 💨 1 mph

Sunday, Oct 4Sun Oct 4

Partly cloudy 67°/46° 💧 None 💨 4 mph

Monday, Oct 5Mon Oct 5

Mostly cloudy 71°/47° 💧 None 💨 5 mph

Tuesday, Oct 6Tue Oct 6

Mostly cloudy 77°/49° 💧 None 💨 4 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 2:00 PM

PM2.5 Fine particles Good 5,5µg/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 7,0µg/m³

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

O₃ Ozone Fair 96,4µg/m³

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

NO₂ Nitrogen dioxide Good 0,7µg/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 4,1Moderate 🙂Fair

Tomorrow UV 2,9Low 🙂Fair

Thursday UV 3,1Moderate 😐Moderate

Friday UV 3,1Moderate 🙂Fair

Saturday UV 3,7Moderate 🙂Fair

Sunday UV 3,0Moderate —Unavailable

Monday UV 5,0Moderate —Unavailable

Hourly UV index today

2:00 PMUV 3,8 3:00 PMUV 2,9 4:00 PMUV 1,8 5:00 PMUV 0,8 6:00 PMUV 0,2 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. Dry air can increase hydration needs.

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

Excellent observing conditions. Best local viewing window: 9:00 PM–10:00 PM.

94/100Best-hour score

BEST TIME TONIGHT 9:00 PM–10:00 PM Astronomical darkness: 8:38 PM–4:59 AM

☁ Cloud cover 0% Real hourly forecast for the best viewing hour.

☾ Moonlight 87% Waxing Gibbous · Moon about 24° above the horizon at the best viewing hour.

☄ Meteor activity Southern Taurids Reference ZHR 7 · Radiant -1° high at the best hour.

✦ Estimated visible meteors 0–1/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min5%

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

SEP 20–NOV 20

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

ACTIVE NOW

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

NOV 6–NOV 30

LeonidsStart NOV 6 · Peak NOV 17 · End NOV 30 · ZHR 15 · 52% 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 1:41 PM. The current forecast period extends through 24/09/2026 at 11:00 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.