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Current weather in St. Johns is clear sky.

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

Now · 5:08 AM

St. Johns Weather & Hourly Forecast

United States · Arizona · 85936

61°F

Clear night

Feels like: 60°F

💧 Humidity 77% 🌡 Pressure 30.03 inHg 💨 Wind 3 mph 👁 Visibility 28.0 mi ☁ Clouds 1% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for St. Johns

Today

6:00 AM

Sunny

60° 💧 None 💨 2 mph H 78%30.06 inHg

9:00 AM

Sunny

76° 💧 None 💨 2 mph H 39%30.06 inHg

12:00 PM

Sunny

86° 💧 0.002 in 💨 2 mph H 26%30.00 inHg

3:00 PM

Partly cloudy

88° 💧 0.011 in 💨 3 mph H 23%29.91 inHg

6:00 PM

Mostly sunny

82° 💧 0.001 in 💨 11 mph H 32%29.94 inHg

9:00 PM

Clear night

74° 💧 None 💨 7 mph H 52%30.03 inHg

Tomorrow

12:00 AM

Mostly clear night

68° 💧 None 💨 8 mph H 63%30.03 inHg

3:00 AM

Clear night

67° 💧 None 💨 4 mph H 58%30.03 inHg

6:00 AM

Sunny

63° 💧 None 💨 3 mph H 66%30.09 inHg

9:00 AM

Sunny

79° 💧 None 💨 1 mph H 34%30.12 inHg

12:00 PM

Sunny

89° 💧 0.000 in 💨 2 mph H 22%30.03 inHg

3:00 PM

Sunny

92° 💧 0.000 in 💨 6 mph H 18%29.91 inHg

6:00 PM

Mostly cloudy

88° 💧 0.003 in 💨 4 mph H 19%29.91 inHg

9:00 PM

Clear night

76° 💧 None 💨 9 mph H 47%30.03 inHg

Thursday

12:00 AM

Clear night

73° 💧 None 💨 9 mph H 45%30.03 inHg

3:00 AM

Clear night

69° 💧 None 💨 3 mph H 53%30.03 inHg

Today

6:00 AM

Sunny

60° 💧 None 💨 2 mph H 78%30.06 inHg

7:00 AM

Sunny

64° 💧 None 💨 4 mph H 66%30.06 inHg

8:00 AM

Sunny

72° 💧 None 💨 3 mph H 48%30.09 inHg

9:00 AM

Sunny

76° 💧 None 💨 2 mph H 39%30.06 inHg

10:00 AM

Sunny

80° 💧 None 💨 2 mph H 34%30.03 inHg

11:00 AM

Sunny

83° 💧 None 💨 2 mph H 29%30.03 inHg

12:00 PM

Sunny

86° 💧 None 💨 2 mph H 26%30.00 inHg

1:00 PM

Mostly sunny

88° 💧 None 💨 3 mph H 23%29.94 inHg

2:00 PM

Partly cloudy

89° 💧 0.002 in 💨 5 mph H 23%29.91 inHg

3:00 PM

Partly cloudy

88° 💧 0.004 in 💨 3 mph H 23%29.91 inHg

4:00 PM

Partly cloudy

86° 💧 0.004 in 💨 7 mph H 27%29.91 inHg

5:00 PM

Light thunderstorms

84° 💧 0.004 in 💨 12 mph H 30%29.91 inHg

6:00 PM

Mostly sunny

82° 💧 0.001 in 💨 11 mph H 32%29.94 inHg

7:00 PM

Mostly clear night

79° 💧 None 💨 10 mph H 40%29.97 inHg

8:00 PM

Clear night

77° 💧 None 💨 7 mph H 47%30.00 inHg

9:00 PM

Clear night

74° 💧 None 💨 7 mph H 52%30.03 inHg

10:00 PM

Mostly clear night

71° 💧 None 💨 6 mph H 58%30.03 inHg

11:00 PM

Mostly clear night

69° 💧 None 💨 7 mph H 64%30.03 inHg

Tomorrow

12:00 AM

Mostly clear night

68° 💧 None 💨 8 mph H 63%30.03 inHg

1:00 AM

Mostly clear night

68° 💧 None 💨 7 mph H 59%30.03 inHg

2:00 AM

Clear night

68° 💧 None 💨 5 mph H 57%30.03 inHg

3:00 AM

Clear night

67° 💧 None 💨 4 mph H 58%30.03 inHg

4:00 AM

Clear night

66° 💧 None 💨 4 mph H 61%30.06 inHg

5:00 AM

Clear night

64° 💧 None 💨 2 mph H 64%30.09 inHg

6:00 AM

Sunny

63° 💧 None 💨 3 mph H 66%30.09 inHg

7:00 AM

Sunny

67° 💧 None 💨 5 mph H 56%30.12 inHg

8:00 AM

Sunny

74° 💧 None 💨 3 mph H 41%30.12 inHg

9:00 AM

Sunny

79° 💧 None 💨 1 mph H 34%30.12 inHg

10:00 AM

Sunny

83° 💧 None 💨 2 mph H 29%30.09 inHg

11:00 AM

Sunny

86° 💧 None 💨 2 mph H 25%30.09 inHg

12:00 PM

Sunny

89° 💧 None 💨 2 mph H 22%30.03 inHg

1:00 PM

Sunny

90° 💧 None 💨 3 mph H 20%30.00 inHg

2:00 PM

Sunny

92° 💧 0.000 in 💨 5 mph H 19%29.94 inHg

3:00 PM

Sunny

92° 💧 None 💨 6 mph H 18%29.91 inHg

4:00 PM

Mostly sunny

92° 💧 0.000 in 💨 7 mph H 18%29.88 inHg

5:00 PM

Partly cloudy

91° 💧 None 💨 7 mph H 19%29.88 inHg

6:00 PM

Mostly cloudy

88° 💧 None 💨 4 mph H 19%29.91 inHg

7:00 PM

Mostly clear night

79° 💧 0.001 in 💨 18 mph H 39%30.00 inHg

8:00 PM

Clear night

77° 💧 0.002 in 💨 14 mph H 46%30.00 inHg

9:00 PM

Clear night

76° 💧 None 💨 9 mph H 47%30.03 inHg

10:00 PM

Clear night

75° 💧 None 💨 10 mph H 44%30.03 inHg

11:00 PM

Clear night

74° 💧 None 💨 12 mph H 44%30.03 inHg

Thursday

12:00 AM

Clear night

73° 💧 None 💨 9 mph H 45%30.03 inHg

1:00 AM

Clear night

72° 💧 None 💨 5 mph H 46%30.03 inHg

2:00 AM

Clear night

70° 💧 None 💨 4 mph H 49%30.03 inHg

3:00 AM

Clear night

69° 💧 None 💨 3 mph H 53%30.03 inHg

4:00 AM

Clear night

67° 💧 None 💨 1 mph H 56%30.03 inHg

5:00 AM

Clear night

66° 💧 None 💨 3 mph H 59%30.06 inHg

6:00 AM

Sunny

65° 💧 None 💨 5 mph H 62%30.06 inHg

7:00 AM

Sunny

68° 💧 None 💨 5 mph H 54%30.06 inHg

8:00 AM

Sunny

74° 💧 None 💨 2 mph H 42%30.09 inHg

9:00 AM

Sunny

79° 💧 None 💨 2 mph H 34%30.06 inHg

10:00 AM

Sunny

83° 💧 None 💨 2 mph H 28%30.03 inHg

11:00 AM

Sunny

87° 💧 None 💨 3 mph H 22%30.00 inHg

12:00 PM

Sunny

90° 💧 None 💨 5 mph H 15%29.94 inHg

1:00 PM

Sunny

92° 💧 None 💨 6 mph H 12%29.91 inHg

2:00 PM

Sunny

93° 💧 None 💨 8 mph H 12%29.85 inHg

3:00 PM

Sunny

93° 💧 None 💨 9 mph H 12%29.83 inHg

4:00 PM

Sunny

92° 💧 None 💨 8 mph H 12%29.80 inHg

5:00 PM

Sunny

91° 💧 None 💨 8 mph H 13%29.80 inHg

8:00 PM

Mostly clear night

84° 💧 None 💨 6 mph H 17%29.83 inHg

11:00 PM

Partly cloudy night

76° 💧 None 💨 17 mph H 40%29.91 inHg

Friday

2:00 AM

Clear night

73° 💧 None 💨 12 mph H 45%29.91 inHg

5:00 AM

Clear night

71° 💧 None 💨 9 mph H 49%29.94 inHg

8:00 AM

Sunny

78° 💧 None 💨 14 mph H 40%29.97 inHg

11:00 AM

Light rain

82° 💧 None 💨 13 mph H 33%29.94 inHg

2:00 PM

Light rain

86° 💧 None 💨 15 mph H 27%29.85 inHg

5:00 PM

Partly cloudy

83° 💧 None 💨 8 mph H 28%29.83 inHg

8:00 PM

Mostly clear night

75° 💧 None 💨 12 mph H 49%29.88 inHg

11:00 PM

Overcast night

71° 💧 None 💨 8 mph H 59%29.91 inHg

Saturday

2:00 AM

Mostly clear night

69° 💧 None 💨 10 mph H 65%29.94 inHg

5:00 AM

Clear night

66° 💧 None 💨 5 mph H 73%29.97 inHg

8:00 AM

Sunny

72° 💧 None 💨 3 mph H 59%30.00 inHg

11:00 AM

Mostly sunny

81° 💧 None 💨 4 mph H 40%29.94 inHg

2:00 PM

Mostly sunny

88° 💧 None 💨 4 mph H 29%29.83 inHg

5:00 PM

Overcast

79° 💧 None 💨 17 mph H 42%29.85 inHg

8:00 PM

Mostly clear night

74° 💧 None 💨 9 mph H 58%29.91 inHg

11:00 PM

Clear night

71° 💧 None 💨 8 mph H 58%29.94 inHg

Sunday

2:00 AM

Clear night

66° 💧 None 💨 4 mph H 70%29.94 inHg

5:00 AM

Clear night

62° 💧 None 💨 5 mph H 73%29.94 inHg

8:00 AM

Sunny

71° 💧 None 💨 4 mph H 57%30.00 inHg

11:00 AM

Sunny

81° 💧 None 💨 2 mph H 40%29.94 inHg

2:00 PM

Partly cloudy

88° 💧 None 💨 10 mph H 28%29.83 inHg

5:00 PM

Partly cloudy

81° 💧 None 💨 16 mph H 37%29.83 inHg

11:00 PM

Clear night

71° 💧 None 💨 10 mph H 62%29.94 inHg

Monday

5:00 AM

Mostly clear night

63° 💧 None 💨 4 mph H 77%29.97 inHg

11:00 AM

Light rain

79° 💧 None 💨 4 mph H 45%29.97 inHg

5:00 PM

Light thunderstorms

69° 💧 None 💨 17 mph H 78%29.94 inHg

11:00 PM

Mostly clear night

66° 💧 None 💨 5 mph H 89%29.97 inHg

Tuesday

5:00 AM

Clear night

61° 💧 None 💨 3 mph H 87%30.03 inHg

11:00 AM

Mostly sunny

77° 💧 None 💨 1 mph H 54%30.06 inHg

5:00 PM

Mostly cloudy

77° 💧 None 💨 4 mph H 53%29.94 inHg

11:00 PM

Clear night

66° 💧 None 💨 7 mph H 74%30.06 inHg

Wednesday

5:00 AM

Clear night

60° 💧 None 💨 5 mph H 89%30.12 inHg

11:00 AM

Mostly sunny

77° 💧 None 💨 2 mph H 52%30.12 inHg

5:00 PM

Overcast

75° 💧 None 💨 6 mph H 58%30.06 inHg

11:00 PM

Mostly cloudy night

65° 💧 None 💨 3 mph H 85%30.12 inHg

Thursday

5:00 AM

Clear night

62° 💧 None 💨 2 mph H 82%30.15 inHg

11:00 AM

Sunny

80° 💧 None 💨 4 mph H 43%30.12 inHg

5:00 PM

Light rain

76° 💧 None 💨 7 mph H 54%30.09 inHg

11:00 PM

Mostly cloudy night

66° 💧 None 💨 4 mph H 82%30.18 inHg

Friday

5:00 AM

Mostly clear night

61° 💧 None 💨 6 mph H 83%30.18 inHg

11:00 AM

Mostly sunny

82° 💧 None 💨 9 mph H 31%30.15 inHg

5:00 PM

Mostly cloudy

80° 💧 None 💨 11 mph H 34%30.03 inHg

11:00 PM

Mostly clear night

65° 💧 None 💨 6 mph H 70%30.18 inHg

Saturday

5:00 AM

Clear night

59° 💧 None 💨 2 mph H 85%30.15 inHg

11:00 AM

Mostly sunny

79° 💧 None 💨 6 mph H 39%30.09 inHg

5:00 PM

Mostly sunny

82° 💧 None 💨 2 mph H 30%29.88 inHg

11:00 PM

Mostly clear night

64° 💧 None 💨 7 mph H 78%30.00 inHg

Sunday

5:00 AM

Mostly clear night

61° 💧 None 💨 3 mph H 75%30.00 inHg

11:00 AM

Mostly cloudy

77° 💧 None 💨 2 mph H 46%29.97 inHg

5:00 PM

Mostly cloudy

76° 💧 None 💨 7 mph H 44%29.88 inHg

11:00 PM

Partly cloudy night

62° 💧 None 💨 4 mph H 91%30.03 inHg

Monday

5:00 AM

Overcast night

58° 💧 None 💨 1 mph H 97%30.03 inHg

11:00 AM

Partly cloudy

71° 💧 None 💨 5 mph H 67%30.09 inHg

5:00 PM

Heavy rain

68° 💧 None 💨 3 mph H 70%30.03 inHg

11:00 PM

Mostly clear night

60° 💧 None 💨 3 mph H 95%30.12 inHg

Tuesday

5:00 AM

Clear night

58° 💧 None 💨 1 mph H 90%30.15 inHg

11:00 AM

Sunny

71° 💧 None 💨 5 mph H 59%30.15 inHg

5:00 PM

Mostly sunny

74° 💧 None 💨 4 mph H 50%30.00 inHg

In St. Johns and, more broadly, across the state of Arizona: The evening will feature mostly cloudy skies with very hot conditions, with temperatures holding between 93 and 96 degrees Fahrenheit. Light westward winds will prevail, generally blowing at around 8 mph, with occasional gusts reaching up to 14 mph. No precipitation is anticipated during the coming hours, providing a dry night. Temperatures are expected to stay elevated through the evening, so it remains quite warm. Residents should remain cautious of the heat, especially if spending extended time outdoors, and stay hydrated. The wind may offer some relief, but it will remain fairly gentle throughout the evening. Overall, expect a warm, dry night with mostly cloudy skies and mild breezes.

15-Day Weather Outlook for St. Johns

TomorrowTomorrow

Light thunderstorms 92°/63° 💧 None 💨 12 mph

Thursday, Sep 10Thu Sep 10

Partly cloudy 93°/65° 💧 None 💨 18 mph

Friday, Sep 11Fri Sep 11

Light rain 91°/71° 💧 0.034 in 💨 17 mph

Saturday, Sep 12Sat Sep 12

Mostly sunny 88°/66° 💧 0.020 in 💨 12 mph

Sunday, Sep 13Sun Sep 13

Overcast 88°/62° 💧 0.023 in 💨 17 mph

Monday, Sep 14Mon Sep 14

Light rain 81°/63° 💧 0.024 in 💨 16 mph

Tuesday, Sep 15Tue Sep 15

Light thunderstorms 77°/61° 💧 0.278 in 💨 17 mph

Wednesday, Sep 16Wed Sep 16

Mostly cloudy 77°/60° 💧 0.056 in 💨 7 mph

Thursday, Sep 17Thu Sep 17

Overcast 80°/62° 💧 0.037 in 💨 6 mph

Friday, Sep 18Fri Sep 18

Light rain 82°/61° 💧 0.028 in 💨 9 mph

Saturday, Sep 19Sat Sep 19

Mostly cloudy 80°/59° 💧 0.009 in 💨 11 mph

Sunday, Sep 20Sun Sep 20

Mostly cloudy 82°/61° 💧 0.180 in 💨 7 mph

Monday, Sep 21Mon Sep 21

Partly cloudy 76°/58° 💧 0.374 in 💨 7 mph

Tuesday, Sep 22Tue Sep 22

Heavy rain 71°/58° 💧 0.294 in 💨 5 mph

Wednesday, Sep 23Wed Sep 23

Mostly sunny 74°/74° 💧 0.002 in 💨 4 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in St. Johns

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for St. Johns

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 6:00 AM

PM2.5 Fine particles Good 1,3µg/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 2,2µg/m³

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

O₃ Ozone Good 27,1µg/m³

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

NO₂ Nitrogen dioxide Good 1,6µg/m³

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

Air quality is favorable for outdoor activities.

UV & HEALTH

UV, Sun & Health Outlook in St. Johns

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 9,5Very high 😊Good

Tomorrow UV 10,0Very high 🙂Fair

Thursday UV 10,0Very high 🙂Fair

Friday UV 9,7Very high 🙂Fair

Saturday UV 7,0High 😊Good

Sunday UV 7,0High —Unavailable

Monday UV 7,0High —Unavailable

Hourly UV index today

7:00 AMUV 0,3 8:00 AMUV 1,4 9:00 AMUV 3,5 10:00 AMUV 5,7 11:00 AMUV 8,2 12:00 PMUV 9,5 1:00 PMUV 9,4 2:00 PMUV 7,7 3:00 PMUV 4,7 4:00 PMUV 1,0 5:00 PMUV 0,2 6:00 PMUV 0,1

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.

Good air quality

Air quality is good and outdoor activities can be enjoyed normally.

Comfortable temperature conditions

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

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 St. Johns

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · ST. JOHNS, ARIZONA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 5:00 AM–6:00 AM.

100/100Best-hour score

BEST TIME TONIGHT 5:00 AM–6:00 AM Astronomical darkness: 8:00 PM–4:30 AM

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

☾ Moonlight 6% Waning Crescent · Moon about 7° above the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 80° high at the best hour.

✦ Estimated visible meteors 2–5/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min80%

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 St. Johns were last refreshed today at 5:08 AM. The current forecast period extends through 10/09/2026 at 3:00 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.