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Current weather in Waterloo is clear sky.

Where can I find the hourly weather forecast for Waterloo?

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

Is the weather forecast for Waterloo updated regularly?

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

Now · 2:30 PM

Waterloo Weather & Hourly Forecast

United States · California · 95215

84°F

Sunny

Feels like: 80°F

💧 Humidity 23% 🌡 Pressure 29.91 inHg 💨 Wind 6 mph 👁 Visibility 21.4 mi ☁ Clouds 0% ☀️ UV index 6.7 · High 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Waterloo

Today

3:00 PM

Sunny

84° 💧 None 💨 6 mph H 23%29.91 inHg

6:00 PM

Sunny

83° 💧 None 💨 7 mph H 21%29.88 inHg

9:00 PM

Clear night

71° 💧 None 💨 7 mph H 37%29.91 inHg

Tomorrow

12:00 AM

Clear night

64° 💧 None 💨 1 mph H 58%29.94 inHg

3:00 AM

Clear night

61° 💧 None 💨 2 mph H 66%29.94 inHg

6:00 AM

Clear night

59° 💧 None 💨 4 mph H 79%29.94 inHg

9:00 AM

Sunny

65° 💧 None 💨 4 mph H 67%29.97 inHg

12:00 PM

Sunny

81° 💧 None 💨 4 mph H 31%29.94 inHg

3:00 PM

Sunny

90° 💧 None 💨 3 mph H 19%29.88 inHg

6:00 PM

Sunny

90° 💧 None 💨 3 mph H 17%29.85 inHg

9:00 PM

Clear night

80° 💧 None 💨 4 mph H 23%29.88 inHg

Tuesday

12:00 AM

Clear night

71° 💧 None 💨 4 mph H 46%29.88 inHg

3:00 AM

Clear night

67° 💧 None 💨 3 mph H 53%29.91 inHg

6:00 AM

Clear night

64° 💧 None 💨 4 mph H 59%29.91 inHg

9:00 AM

Sunny

71° 💧 None 💨 3 mph H 48%29.97 inHg

12:00 PM

Sunny

89° 💧 None 💨 4 mph H 23%29.97 inHg

Today

3:00 PM

Sunny

84° 💧 None 💨 6 mph H 23%29.91 inHg

4:00 PM

Sunny

85° 💧 None 💨 6 mph H 22%29.88 inHg

5:00 PM

Sunny

85° 💧 None 💨 6 mph H 21%29.88 inHg

6:00 PM

Sunny

83° 💧 None 💨 7 mph H 21%29.88 inHg

7:00 PM

Sunny

80° 💧 None 💨 8 mph H 23%29.88 inHg

8:00 PM

Clear night

75° 💧 None 💨 8 mph H 30%29.91 inHg

9:00 PM

Clear night

71° 💧 None 💨 7 mph H 37%29.91 inHg

10:00 PM

Clear night

68° 💧 None 💨 6 mph H 44%29.94 inHg

11:00 PM

Clear night

66° 💧 None 💨 4 mph H 51%29.94 inHg

Tomorrow

12:00 AM

Clear night

64° 💧 None 💨 1 mph H 58%29.94 inHg

1:00 AM

Clear night

63° 💧 None 💨 1 mph H 61%29.94 inHg

2:00 AM

Clear night

62° 💧 None 💨 2 mph H 64%29.94 inHg

3:00 AM

Clear night

61° 💧 None 💨 2 mph H 66%29.94 inHg

4:00 AM

Clear night

60° 💧 None 💨 3 mph H 69%29.94 inHg

5:00 AM

Clear night

60° 💧 None 💨 3 mph H 74%29.94 inHg

6:00 AM

Clear night

59° 💧 None 💨 4 mph H 79%29.94 inHg

7:00 AM

Sunny

58° 💧 None 💨 4 mph H 83%29.97 inHg

8:00 AM

Sunny

61° 💧 None 💨 4 mph H 77%29.97 inHg

9:00 AM

Sunny

65° 💧 None 💨 4 mph H 67%29.97 inHg

10:00 AM

Sunny

70° 💧 None 💨 3 mph H 54%29.97 inHg

11:00 AM

Sunny

76° 💧 None 💨 3 mph H 41%29.97 inHg

12:00 PM

Sunny

81° 💧 None 💨 4 mph H 31%29.94 inHg

1:00 PM

Sunny

85° 💧 None 💨 4 mph H 25%29.94 inHg

2:00 PM

Sunny

88° 💧 None 💨 3 mph H 21%29.91 inHg

3:00 PM

Sunny

90° 💧 None 💨 3 mph H 19%29.88 inHg

4:00 PM

Sunny

91° 💧 None 💨 3 mph H 18%29.85 inHg

5:00 PM

Sunny

91° 💧 None 💨 3 mph H 17%29.85 inHg

6:00 PM

Sunny

90° 💧 None 💨 3 mph H 17%29.85 inHg

7:00 PM

Sunny

86° 💧 None 💨 3 mph H 20%29.85 inHg

8:00 PM

Clear night

82° 💧 None 💨 2 mph H 22%29.85 inHg

9:00 PM

Clear night

80° 💧 None 💨 4 mph H 23%29.88 inHg

10:00 PM

Clear night

77° 💧 None 💨 7 mph H 35%29.91 inHg

11:00 PM

Clear night

73° 💧 None 💨 4 mph H 42%29.91 inHg

Tuesday

12:00 AM

Clear night

71° 💧 None 💨 4 mph H 46%29.88 inHg

1:00 AM

Clear night

70° 💧 None 💨 2 mph H 48%29.91 inHg

2:00 AM

Clear night

68° 💧 None 💨 2 mph H 51%29.91 inHg

3:00 AM

Clear night

67° 💧 None 💨 3 mph H 53%29.91 inHg

4:00 AM

Clear night

66° 💧 None 💨 3 mph H 55%29.91 inHg

5:00 AM

Clear night

65° 💧 None 💨 4 mph H 56%29.91 inHg

6:00 AM

Clear night

64° 💧 None 💨 4 mph H 59%29.91 inHg

7:00 AM

Sunny

63° 💧 None 💨 4 mph H 63%29.94 inHg

8:00 AM

Sunny

66° 💧 None 💨 5 mph H 57%29.97 inHg

9:00 AM

Sunny

71° 💧 None 💨 3 mph H 48%29.97 inHg

10:00 AM

Sunny

78° 💧 None 💨 4 mph H 39%29.97 inHg

11:00 AM

Sunny

84° 💧 None 💨 4 mph H 30%29.97 inHg

12:00 PM

Sunny

89° 💧 None 💨 4 mph H 23%29.97 inHg

1:00 PM

Sunny

93° 💧 None 💨 3 mph H 18%29.94 inHg

2:00 PM

Mostly cloudy

96° 💧 None 💨 3 mph H 16%29.94 inHg

3:00 PM

Mostly cloudy

97° 💧 None 💨 3 mph H 14%29.91 inHg

4:00 PM

Mostly cloudy

97° 💧 None 💨 3 mph H 14%29.88 inHg

5:00 PM

Mostly cloudy

97° 💧 None 💨 4 mph H 13%29.88 inHg

6:00 PM

Mostly cloudy

96° 💧 None 💨 5 mph H 14%29.88 inHg

7:00 PM

Mostly cloudy

92° 💧 None 💨 4 mph H 15%29.88 inHg

8:00 PM

Mostly cloudy night

87° 💧 None 💨 3 mph H 19%29.91 inHg

9:00 PM

Overcast night

85° 💧 None 💨 4 mph H 20%29.91 inHg

10:00 PM

Overcast night

82° 💧 None 💨 8 mph H 26%29.94 inHg

11:00 PM

Overcast night

80° 💧 None 💨 6 mph H 32%29.94 inHg

Wednesday

12:00 AM

Overcast night

78° 💧 None 💨 5 mph H 36%29.94 inHg

1:00 AM

Overcast night

76° 💧 None 💨 5 mph H 36%29.94 inHg

2:00 AM

Mostly cloudy night

75° 💧 None 💨 4 mph H 37%29.94 inHg

3:00 AM

Mostly cloudy night

74° 💧 None 💨 4 mph H 39%29.94 inHg

4:00 AM

Partly cloudy night

73° 💧 None 💨 4 mph H 40%29.94 inHg

5:00 AM

Mostly cloudy night

72° 💧 None 💨 4 mph H 42%29.97 inHg

8:00 AM

Overcast

73° 💧 None 💨 5 mph H 42%30.00 inHg

11:00 AM

Overcast

87° 💧 None 💨 5 mph H 23%30.03 inHg

2:00 PM

Partly cloudy

99° 💧 None 💨 7 mph H 12%29.94 inHg

5:00 PM

Partly cloudy

101° 💧 None 💨 7 mph H 9%29.88 inHg

8:00 PM

Mostly cloudy night

91° 💧 None 💨 7 mph H 16%29.88 inHg

11:00 PM

Mostly cloudy night

85° 💧 None 💨 5 mph H 20%29.91 inHg

Thursday

2:00 AM

Mostly cloudy night

80° 💧 None 💨 1 mph H 24%29.91 inHg

5:00 AM

Mostly clear night

76° 💧 None 💨 1 mph H 28%29.91 inHg

8:00 AM

Sunny

76° 💧 None 💨 2 mph H 31%29.94 inHg

11:00 AM

Sunny

92° 💧 None 💨 2 mph H 17%29.91 inHg

2:00 PM

Sunny

102° 💧 None 💨 10 mph H 12%29.85 inHg

5:00 PM

Sunny

100° 💧 None 💨 11 mph H 13%29.83 inHg

8:00 PM

Clear night

88° 💧 None 💨 8 mph H 20%29.83 inHg

11:00 PM

Clear night

80° 💧 None 💨 2 mph H 30%29.88 inHg

Friday

2:00 AM

Clear night

74° 💧 None 💨 3 mph H 41%29.85 inHg

5:00 AM

Partly cloudy night

69° 💧 None 💨 1 mph H 56%29.85 inHg

8:00 AM

Sunny

67° 💧 None 💨 1 mph H 57%29.88 inHg

11:00 AM

Sunny

81° 💧 None 💨 1 mph H 34%29.88 inHg

2:00 PM

Sunny

91° 💧 None 💨 5 mph H 23%29.85 inHg

5:00 PM

Sunny

92° 💧 None 💨 9 mph H 24%29.80 inHg

8:00 PM

Clear night

76° 💧 None 💨 8 mph H 48%29.80 inHg

11:00 PM

Clear night

70° 💧 None 💨 3 mph H 57%29.85 inHg

Saturday

2:00 AM

Mostly clear night

64° 💧 None 💨 5 mph H 62%29.85 inHg

5:00 AM

Clear night

61° 💧 None 💨 4 mph H 70%29.85 inHg

11:00 AM

Sunny

77° 💧 None 💨 3 mph H 34%29.91 inHg

5:00 PM

Mostly sunny

86° 💧 None 💨 7 mph H 20%29.83 inHg

11:00 PM

Mostly cloudy night

64° 💧 None 💨 3 mph H 59%29.88 inHg

Sunday

5:00 AM

Overcast night

59° 💧 None 💨 2 mph H 74%29.88 inHg

11:00 AM

Sunny

73° 💧 None 💨 6 mph H 46%29.91 inHg

5:00 PM

Sunny

90° 💧 None 💨 6 mph H 17%29.80 inHg

11:00 PM

Clear night

72° 💧 None 💨 6 mph H 34%29.83 inHg

Monday

5:00 AM

Partly cloudy night

64° 💧 None 💨 2 mph H 55%29.83 inHg

11:00 AM

Sunny

80° 💧 None 💨 5 mph H 29%29.85 inHg

5:00 PM

Sunny

93° 💧 None 💨 6 mph H 12%29.77 inHg

11:00 PM

Mostly clear night

68° 💧 None 💨 3 mph H 52%29.83 inHg

Tuesday

5:00 AM

Clear night

60° 💧 None 💨 2 mph H 73%29.83 inHg

11:00 AM

Sunny

74° 💧 None 💨 3 mph H 39%29.91 inHg

5:00 PM

Sunny

81° 💧 None 💨 9 mph H 29%29.85 inHg

11:00 PM

Clear night

61° 💧 None 💨 3 mph H 69%29.94 inHg

Wednesday

5:00 AM

Clear night

56° 💧 None 💨 1 mph H 85%30.00 inHg

11:00 AM

Sunny

70° 💧 None 💨 3 mph H 44%30.06 inHg

5:00 PM

Sunny

83° 💧 None 💨 5 mph H 22%29.97 inHg

11:00 PM

Clear night

66° 💧 None 💨 5 mph H 56%30.06 inHg

Thursday

5:00 AM

Clear night

59° 💧 None 💨 2 mph H 67%30.06 inHg

11:00 AM

Sunny

77° 💧 None 💨 5 mph H 34%30.09 inHg

5:00 PM

Sunny

92° 💧 None 💨 7 mph H 19%30.03 inHg

11:00 PM

Clear night

75° 💧 None 💨 9 mph H 45%30.06 inHg

Friday

5:00 AM

Clear night

68° 💧 None 💨 6 mph H 57%30.06 inHg

11:00 AM

Sunny

84° 💧 None 💨 7 mph H 35%30.09 inHg

5:00 PM

Sunny

92° 💧 None 💨 12 mph H 17%30.00 inHg

11:00 PM

Clear night

74° 💧 None 💨 7 mph H 43%30.00 inHg

Saturday

5:00 AM

Clear night

64° 💧 None 💨 1 mph H 62%30.00 inHg

11:00 AM

Sunny

77° 💧 None 💨 6 mph H 33%30.00 inHg

5:00 PM

Sunny

89° 💧 None 💨 8 mph H 13%29.85 inHg

11:00 PM

Clear night

66° 💧 None 💨 4 mph H 53%29.91 inHg

Sunday

5:00 AM

Clear night

59° 💧 None 💨 5 mph H 75%29.88 inHg

11:00 AM

Sunny

75° 💧 None 💨 6 mph H 37%29.91 inHg

5:00 PM

Sunny

92° 💧 None 💨 6 mph H 12%29.77 inHg

11:00 PM

Clear night

74° 💧 None 💨 6 mph H 38%29.77 inHg

Monday

5:00 AM

Clear night

65° 💧 None 💨 5 mph H 44%29.80 inHg

In Waterloo and, more broadly, across the state of California: The late afternoon continues with clear skies, and temperatures will remain mild to warm, ranging from 69 to 85 degrees Fahrenheit. Winds will be moderate from the northwest, reaching speeds up to 14 mph with gusts approaching 30 mph. As evening progresses, conditions are expected to stay dry with no precipitation. The wind may pick up slightly at times, but overall, the night should be tranquil and comfortable. Temperatures will gradually cool, but it will remain pleasant through the evening hours.

15-Day Weather Outlook for Waterloo

TomorrowTomorrow

Sunny 91°/58° 💧 None 💨 8 mph

Tuesday, Sep 8Tue Sep 8

Mostly cloudy 97°/63° 💧 None 💨 7 mph

Wednesday, Sep 9Wed Sep 9

Mostly cloudy 99°/72° 💧 None 💨 8 mph

Thursday, Sep 10Thu Sep 10

Partly cloudy 102°/76° 💧 None 💨 10 mph

Friday, Sep 11Fri Sep 11

Partly cloudy 100°/67° 💧 None 💨 11 mph

Saturday, Sep 12Sat Sep 12

Mostly sunny 92°/61° 💧 None 💨 9 mph

Sunday, Sep 13Sun Sep 13

Mostly sunny 86°/59° 💧 None 💨 7 mph

Monday, Sep 14Mon Sep 14

Partly cloudy 90°/64° 💧 None 💨 6 mph

Tuesday, Sep 15Tue Sep 15

Mostly sunny 93°/60° 💧 None 💨 6 mph

Wednesday, Sep 16Wed Sep 16

Sunny 81°/56° 💧 None 💨 9 mph

Thursday, Sep 17Thu Sep 17

Sunny 83°/59° 💧 None 💨 5 mph

Friday, Sep 18Fri Sep 18

Sunny 92°/68° 💧 None 💨 9 mph

Saturday, Sep 19Sat Sep 19

Sunny 92°/64° 💧 None 💨 12 mph

Sunday, Sep 20Sun Sep 20

Sunny 89°/59° 💧 None 💨 8 mph

Monday, Sep 21Mon Sep 21

Sunny 92°/65° 💧 None 💨 6 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Waterloo

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Waterloo

Hourly forecast · Updated every 2 hours

Moderate

Nearest forecast value 3:00 PM

PM2.5 Fine particles Good 3,1µg/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 5,6µg/m³

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

O₃ Ozone Moderate 101,9µg/m³

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

NO₂ Nitrogen dioxide Good 1,1µg/m³

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

Sensitive people should reduce strenuous and prolonged outdoor exertion.

UV & HEALTH

UV, Sun & Health Outlook in Waterloo

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 7,1High 😐Moderate

Tomorrow UV 7,2High 😐Moderate

Tuesday UV 7,5High 😷Poor

Wednesday UV 8,2Very high 😷Poor

Thursday UV 8,3Very high 😐Moderate

Friday UV 9,0Very high —Unavailable

Saturday UV 8,0Very high —Unavailable

Hourly UV index today

3:00 PMUV 5,3 4:00 PMUV 3,5 5:00 PMUV 1,7 6:00 PMUV 0,6 7:00 PMUV 0,0

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

Strong UV exposure

Protect exposed skin with SPF 30+ sunscreen, wear sunglasses, and try to limit direct midday sun.

Caution for sensitive people

People with respiratory or cardiovascular conditions should reduce prolonged outdoor exertion.

Stay hydrated

Drink water regularly, especially during physical activity or prolonged sun exposure. 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 Waterloo

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · WATERLOO, CALIFORNIA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 2:00 AM–3:00 AM.

100/100Best-hour score

BEST TIME TONIGHT 2:00 AM–3:00 AM Astronomical darkness: 8:57 PM–5:09 AM

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

☾ Moonlight 21% Waning Crescent · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 53° high at the best hour.

✦ Estimated visible meteors 1–4/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min74%

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.

DISCOVER WEATHER NEARBY Weather in other cities

Explore current conditions and forecasts for other locations.

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Forecast data for Waterloo were last refreshed today at 2:30 PM. The current forecast period extends through 08/09/2026 at 12:00 PM. 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.