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Current weather in El Cajon is thunderstorm.

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

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

Now · 2:47 PM

El Cajon Weather & Hourly Forecast

United States · California · 92020

97°F

Strong thunderstorm

Feels like: 98°F

💧 Humidity 34% 🌡 Pressure 29.83 inHg 💨 Wind 7 mph 👁 Visibility 26.1 mi ☁ Clouds 34% ☀️ UV index 8.1 · Very high 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for El Cajon

Today

3:00 PM

Strong thunderstorm

97° 💧 0.002 in 💨 7 mph H 34%29.83 inHg

6:00 PM

Mostly sunny

92° 💧 None 💨 6 mph H 48%29.83 inHg

9:00 PM

Mostly clear night

84° 💧 None 💨 5 mph H 63%29.88 inHg

Tomorrow

12:00 AM

Mostly cloudy night

82° 💧 None 💨 3 mph H 66%29.88 inHg

3:00 AM

Mostly cloudy night

79° 💧 None 💨 1 mph H 73%29.88 inHg

6:00 AM

Mostly cloudy night

78° 💧 None 💨 2 mph H 73%29.88 inHg

9:00 AM

Sunny

89° 💧 None 💨 3 mph H 41%29.91 inHg

12:00 PM

Sunny

99° 💧 None 💨 7 mph H 28%29.88 inHg

3:00 PM

Sunny

98° 💧 None 💨 10 mph H 26%29.85 inHg

6:00 PM

Sunny

91° 💧 None 💨 8 mph H 33%29.85 inHg

9:00 PM

Mostly clear night

84° 💧 None 💨 2 mph H 42%29.91 inHg

Wednesday

12:00 AM

Clear night

82° 💧 None 💨 1 mph H 47%29.94 inHg

3:00 AM

Clear night

79° 💧 None 💨 1 mph H 51%29.91 inHg

6:00 AM

Clear night

78° 💧 None 💨 0 mph H 56%29.91 inHg

9:00 AM

Sunny

90° 💧 None 💨 1 mph H 41%29.94 inHg

12:00 PM

Sunny

102° 💧 None 💨 7 mph H 27%29.91 inHg

Today

3:00 PM

Strong thunderstorm

97° 💧 0.001 in 💨 7 mph H 34%29.83 inHg

4:00 PM

Sunny

95° 💧 None 💨 8 mph H 39%29.83 inHg

5:00 PM

Strong thunderstorm

93° 💧 0.001 in 💨 7 mph H 45%29.85 inHg

6:00 PM

Mostly sunny

92° 💧 None 💨 6 mph H 48%29.83 inHg

7:00 PM

Partly cloudy

88° 💧 None 💨 7 mph H 57%29.85 inHg

8:00 PM

Mostly clear night

85° 💧 None 💨 6 mph H 63%29.85 inHg

9:00 PM

Mostly clear night

84° 💧 None 💨 5 mph H 63%29.88 inHg

10:00 PM

Mostly cloudy night

84° 💧 None 💨 4 mph H 62%29.88 inHg

11:00 PM

Mostly cloudy night

83° 💧 None 💨 3 mph H 64%29.88 inHg

Tomorrow

12:00 AM

Mostly cloudy night

82° 💧 None 💨 3 mph H 66%29.88 inHg

1:00 AM

Overcast night

81° 💧 None 💨 1 mph H 69%29.88 inHg

2:00 AM

Mostly cloudy night

80° 💧 None 💨 1 mph H 71%29.88 inHg

3:00 AM

Mostly cloudy night

79° 💧 None 💨 1 mph H 73%29.88 inHg

4:00 AM

Mostly cloudy night

79° 💧 None 💨 1 mph H 73%29.88 inHg

5:00 AM

Mostly cloudy night

78° 💧 None 💨 2 mph H 73%29.88 inHg

6:00 AM

Mostly cloudy night

78° 💧 None 💨 2 mph H 73%29.88 inHg

7:00 AM

Sunny

78° 💧 None 💨 3 mph H 69%29.88 inHg

8:00 AM

Sunny

84° 💧 None 💨 2 mph H 56%29.91 inHg

9:00 AM

Sunny

89° 💧 None 💨 3 mph H 41%29.91 inHg

10:00 AM

Sunny

93° 💧 None 💨 5 mph H 34%29.91 inHg

11:00 AM

Sunny

97° 💧 None 💨 6 mph H 30%29.88 inHg

12:00 PM

Sunny

99° 💧 None 💨 7 mph H 28%29.88 inHg

1:00 PM

Sunny

100° 💧 None 💨 10 mph H 27%29.85 inHg

2:00 PM

Sunny

99° 💧 None 💨 11 mph H 27%29.85 inHg

3:00 PM

Sunny

98° 💧 None 💨 10 mph H 26%29.85 inHg

4:00 PM

Sunny

96° 💧 None 💨 9 mph H 27%29.85 inHg

5:00 PM

Sunny

94° 💧 None 💨 9 mph H 30%29.85 inHg

6:00 PM

Sunny

91° 💧 None 💨 8 mph H 33%29.85 inHg

7:00 PM

Sunny

88° 💧 None 💨 5 mph H 37%29.88 inHg

8:00 PM

Clear night

85° 💧 None 💨 4 mph H 40%29.88 inHg

9:00 PM

Mostly clear night

84° 💧 None 💨 2 mph H 42%29.91 inHg

10:00 PM

Clear night

84° 💧 None 💨 2 mph H 44%29.94 inHg

11:00 PM

Clear night

83° 💧 None 💨 1 mph H 45%29.94 inHg

Wednesday

12:00 AM

Clear night

82° 💧 None 💨 1 mph H 47%29.94 inHg

1:00 AM

Clear night

80° 💧 None 💨 1 mph H 49%29.94 inHg

2:00 AM

Clear night

80° 💧 None 💨 1 mph H 50%29.91 inHg

3:00 AM

Clear night

79° 💧 None 💨 1 mph H 51%29.91 inHg

4:00 AM

Clear night

79° 💧 None 💨 1 mph H 53%29.91 inHg

5:00 AM

Clear night

79° 💧 None 💨 0 mph H 55%29.91 inHg

6:00 AM

Clear night

78° 💧 None 💨 0 mph H 56%29.91 inHg

7:00 AM

Sunny

79° 💧 None 💨 2 mph H 55%29.91 inHg

8:00 AM

Sunny

85° 💧 None 💨 2 mph H 47%29.94 inHg

9:00 AM

Sunny

90° 💧 None 💨 1 mph H 41%29.94 inHg

10:00 AM

Sunny

95° 💧 None 💨 3 mph H 35%29.94 inHg

11:00 AM

Sunny

99° 💧 None 💨 5 mph H 30%29.94 inHg

12:00 PM

Sunny

102° 💧 None 💨 7 mph H 27%29.91 inHg

1:00 PM

Sunny

103° 💧 None 💨 8 mph H 25%29.91 inHg

2:00 PM

Sunny

102° 💧 None 💨 8 mph H 23%29.88 inHg

3:00 PM

Sunny

102° 💧 None 💨 7 mph H 22%29.88 inHg

4:00 PM

Mostly sunny

101° 💧 None 💨 7 mph H 23%29.85 inHg

5:00 PM

Sunny

98° 💧 None 💨 6 mph H 25%29.85 inHg

6:00 PM

Mostly sunny

95° 💧 None 💨 5 mph H 28%29.88 inHg

7:00 PM

Sunny

91° 💧 None 💨 5 mph H 33%29.88 inHg

8:00 PM

Clear night

88° 💧 None 💨 3 mph H 39%29.91 inHg

9:00 PM

Clear night

86° 💧 None 💨 2 mph H 43%29.94 inHg

10:00 PM

Clear night

85° 💧 None 💨 2 mph H 46%29.94 inHg

11:00 PM

Clear night

84° 💧 None 💨 2 mph H 49%29.94 inHg

Thursday

12:00 AM

Clear night

82° 💧 None 💨 2 mph H 53%29.91 inHg

1:00 AM

Clear night

81° 💧 None 💨 2 mph H 57%29.91 inHg

2:00 AM

Clear night

80° 💧 None 💨 1 mph H 61%29.91 inHg

3:00 AM

Clear night

79° 💧 None 💨 1 mph H 64%29.88 inHg

4:00 AM

Clear night

78° 💧 None 💨 1 mph H 66%29.88 inHg

5:00 AM

Clear night

77° 💧 None 💨 1 mph H 68%29.91 inHg

8:00 AM

Sunny

81° 💧 None 💨 0 mph H 58%29.94 inHg

11:00 AM

Sunny

93° 💧 None 💨 5 mph H 36%29.91 inHg

2:00 PM

Sunny

95° 💧 None 💨 7 mph H 28%29.85 inHg

5:00 PM

Sunny

88° 💧 None 💨 6 mph H 41%29.83 inHg

8:00 PM

Clear night

78° 💧 None 💨 3 mph H 59%29.85 inHg

11:00 PM

Clear night

75° 💧 None 💨 3 mph H 66%29.88 inHg

Friday

2:00 AM

Clear night

71° 💧 None 💨 1 mph H 82%29.88 inHg

5:00 AM

Clear night

70° 💧 None 💨 2 mph H 86%29.85 inHg

8:00 AM

Sunny

74° 💧 None 💨 2 mph H 73%29.85 inHg

11:00 AM

Sunny

85° 💧 None 💨 5 mph H 53%29.85 inHg

2:00 PM

Sunny

86° 💧 None 💨 8 mph H 47%29.80 inHg

5:00 PM

Sunny

81° 💧 None 💨 6 mph H 52%29.80 inHg

8:00 PM

Clear night

74° 💧 None 💨 4 mph H 73%29.80 inHg

11:00 PM

Clear night

72° 💧 None 💨 4 mph H 84%29.85 inHg

Saturday

2:00 AM

Mostly clear night

71° 💧 None 💨 3 mph H 88%29.85 inHg

5:00 AM

Partly cloudy night

70° 💧 None 💨 4 mph H 90%29.85 inHg

8:00 AM

Mostly sunny

71° 💧 None 💨 4 mph H 83%29.88 inHg

11:00 AM

Mostly sunny

80° 💧 None 💨 5 mph H 56%29.88 inHg

2:00 PM

Mostly sunny

82° 💧 None 💨 7 mph H 50%29.85 inHg

5:00 PM

Mostly sunny

78° 💧 None 💨 6 mph H 53%29.83 inHg

8:00 PM

Mostly clear night

71° 💧 None 💨 4 mph H 78%29.85 inHg

11:00 PM

Mostly clear night

70° 💧 None 💨 2 mph H 78%29.88 inHg

Sunday

2:00 AM

Mostly clear night

68° 💧 None 💨 1 mph H 84%29.85 inHg

5:00 AM

Partly cloudy night

68° 💧 None 💨 1 mph H 85%29.85 inHg

11:00 AM

Sunny

79° 💧 None 💨 4 mph H 52%29.85 inHg

5:00 PM

Sunny

78° 💧 None 💨 6 mph H 55%29.77 inHg

11:00 PM

Clear night

68° 💧 None 💨 1 mph H 82%29.85 inHg

Monday

5:00 AM

Clear night

62° 💧 None 💨 1 mph H 97%29.83 inHg

11:00 AM

Sunny

80° 💧 None 💨 5 mph H 53%29.85 inHg

5:00 PM

Sunny

78° 💧 None 💨 6 mph H 58%29.83 inHg

11:00 PM

Clear night

70° 💧 None 💨 2 mph H 82%29.91 inHg

Tuesday

5:00 AM

Clear night

66° 💧 None 💨 1 mph H 91%29.91 inHg

11:00 AM

Sunny

82° 💧 None 💨 5 mph H 54%29.97 inHg

5:00 PM

Sunny

80° 💧 None 💨 6 mph H 57%29.91 inHg

11:00 PM

Clear night

70° 💧 None 💨 2 mph H 83%30.00 inHg

Wednesday

5:00 AM

Clear night

66° 💧 None 💨 1 mph H 95%29.97 inHg

11:00 AM

Sunny

83° 💧 None 💨 3 mph H 50%30.00 inHg

5:00 PM

Overcast

80° 💧 None 💨 6 mph H 53%29.94 inHg

11:00 PM

Mostly cloudy night

71° 💧 None 💨 3 mph H 78%30.00 inHg

Thursday

5:00 AM

Partly cloudy night

68° 💧 None 💨 0 mph H 92%29.97 inHg

11:00 AM

Sunny

81° 💧 None 💨 6 mph H 55%30.00 inHg

5:00 PM

Sunny

78° 💧 None 💨 7 mph H 57%29.94 inHg

11:00 PM

Mostly clear night

70° 💧 None 💨 2 mph H 79%30.00 inHg

Friday

5:00 AM

Mostly clear night

66° 💧 None 💨 0 mph H 91%29.97 inHg

11:00 AM

Sunny

80° 💧 None 💨 4 mph H 56%30.00 inHg

5:00 PM

Sunny

78° 💧 None 💨 7 mph H 58%29.91 inHg

11:00 PM

Clear night

69° 💧 None 💨 3 mph H 81%29.97 inHg

Saturday

5:00 AM

Partly cloudy night

65° 💧 None 💨 2 mph H 92%29.97 inHg

11:00 AM

Sunny

79° 💧 None 💨 4 mph H 55%29.97 inHg

5:00 PM

Sunny

78° 💧 None 💨 7 mph H 57%29.91 inHg

11:00 PM

Clear night

69° 💧 None 💨 2 mph H 79%29.94 inHg

Sunday

5:00 AM

Clear night

65° 💧 None 💨 0 mph H 90%29.94 inHg

11:00 AM

Mostly sunny

78° 💧 None 💨 4 mph H 55%29.97 inHg

5:00 PM

Sunny

76° 💧 None 💨 6 mph H 54%29.94 inHg

11:00 PM

Mostly clear night

68° 💧 None 💨 1 mph H 85%30.00 inHg

Monday

5:00 AM

Partly cloudy night

64° 💧 None 💨 1 mph H 97%29.97 inHg

11:00 AM

Mostly sunny

76° 💧 None 💨 4 mph H 54%30.00 inHg

5:00 PM

Sunny

74° 💧 None 💨 6 mph H 56%29.91 inHg

11:00 PM

Clear night

68° 💧 None 💨 3 mph H 77%29.91 inHg

Tuesday

5:00 AM

Overcast night

66° 💧 None 💨 4 mph H 81%29.88 inHg

In El Cajon and, more broadly, across the state of California: As the afternoon comes to a close, clear skies will persist, and temperatures will remain hot, ranging from the mid-70s to near 90 degrees. Winds will be light, coming from the northwest at around 8 mph, with gusts reaching up to 10 mph. As evening approaches, expect continued dry conditions with clear skies and mild breezes. Temperatures will gradually cool but stay warm through the night, making for a comfortable evening without any rain or significant wind. Overall, it will be a pleasant and dry evening with consistent warm temperatures.

15-Day Weather Outlook for El Cajon

TomorrowTomorrow

Strong thunderstorm 100°/78° 💧 None 💨 11 mph

Wednesday, Sep 9Wed Sep 9

Mostly sunny 103°/78° 💧 None 💨 9 mph

Thursday, Sep 10Thu Sep 10

Mostly sunny 98°/77° 💧 0.019 in 💨 7 mph

Friday, Sep 11Fri Sep 11

Sunny 88°/70° 💧 None 💨 8 mph

Saturday, Sep 12Sat Sep 12

Partly cloudy 82°/70° 💧 0.000 in 💨 7 mph

Sunday, Sep 13Sun Sep 13

Partly cloudy 79°/68° 💧 0.001 in 💨 6 mph

Monday, Sep 14Mon Sep 14

Sunny 80°/62° 💧 None 💨 6 mph

Tuesday, Sep 15Tue Sep 15

Sunny 82°/66° 💧 None 💨 6 mph

Wednesday, Sep 16Wed Sep 16

Sunny 83°/66° 💧 0.000 in 💨 6 mph

Thursday, Sep 17Thu Sep 17

Overcast 81°/68° 💧 None 💨 6 mph

Friday, Sep 18Fri Sep 18

Mostly sunny 80°/66° 💧 None 💨 7 mph

Saturday, Sep 19Sat Sep 19

Partly cloudy 79°/65° 💧 None 💨 7 mph

Sunday, Sep 20Sun Sep 20

Mostly sunny 78°/65° 💧 None 💨 7 mph

Monday, Sep 21Mon Sep 21

Mostly sunny 76°/64° 💧 0.005 in 💨 6 mph

Tuesday, Sep 22Tue Sep 22

Overcast 74°/66° 💧 0.001 in 💨 6 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in El Cajon

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for El Cajon

Hourly forecast · Updated every 2 hours

Moderate

Nearest forecast value 3:00 PM

PM2.5 Fine particles Fair 16,7µg/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 Fair 21,0µg/m³

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

O₃ Ozone Moderate 123,0µg/m³

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

NO₂ Nitrogen dioxide Good 1,3µg/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 El Cajon

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 8,1Very high 😐Moderate

Tomorrow UV 9,7Very high 😐Moderate

Wednesday UV 9,4Very high 😐Moderate

Thursday UV 9,5Very high 😐Moderate

Friday UV 9,2Very high 😐Moderate

Saturday UV 7,0High —Unavailable

Sunday UV 7,0High —Unavailable

Hourly UV index today

3:00 PMUV 6,6 4:00 PMUV 3,8 5:00 PMUV 1,6 6:00 PMUV 0,4 7:00 PMUV 0,0

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

Very high UV risk

Use SPF 50+ sunscreen, a hat and sunglasses. Seek shade and limit exposure around midday.

Caution for sensitive people

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

High heat

Stay hydrated and avoid intense exercise during the hottest part of the day.

Best in the morning or late in the day

For walking, running or cycling, prefer the early morning or late afternoon.

WIND OUTLOOK

Hourly Wind Forecast for El Cajon

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · EL CAJON, CALIFORNIA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 8:00 PM–9:00 PM.

87/100Best-hour score

BEST TIME TONIGHT 8:00 PM–9:00 PM Astronomical darkness: 8:28 PM–5:03 AM

☁ Cloud cover 18% Real hourly forecast for the best viewing hour.

☾ Moonlight 15% Waning Crescent · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant -5° 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 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 El Cajon were last refreshed today at 2:47 PM. The current forecast period extends through 09/09/2026 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.