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Current weather in St. Johns is clear sky.

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

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

Now · 2:06 AM

St. Johns Weather & Hourly Forecast

United States · Arizona · 85339

86°F

Clear night

Feels like: 86°F

💧 Humidity 36% 🌡 Pressure 29.80 inHg 💨 Wind 4 mph 👁 Visibility 33.8 mi ☁ Clouds 1% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for St. Johns

Today

3:00 AM

Mostly clear night

85° 💧 None 💨 2 mph H 38%29.80 inHg

6:00 AM

Partly cloudy night

81° 💧 None 💨 1 mph H 45%29.83 inHg

9:00 AM

Mostly sunny

92° 💧 None 💨 3 mph H 29%29.85 inHg

12:00 PM

Partly cloudy

102° 💧 None 💨 7 mph H 17%29.80 inHg

3:00 PM

Sunny

105° 💧 None 💨 12 mph H 15%29.71 inHg

6:00 PM

Mostly cloudy

101° 💧 None 💨 14 mph H 20%29.71 inHg

9:00 PM

Mostly clear night

95° 💧 None 💨 7 mph H 25%29.77 inHg

Tomorrow

12:00 AM

Clear night

91° 💧 None 💨 5 mph H 28%29.80 inHg

3:00 AM

Clear night

86° 💧 None 💨 3 mph H 35%29.80 inHg

6:00 AM

Clear night

83° 💧 None 💨 1 mph H 40%29.83 inHg

9:00 AM

Sunny

94° 💧 None 💨 2 mph H 26%29.85 inHg

12:00 PM

Sunny

104° 💧 None 💨 5 mph H 17%29.83 inHg

3:00 PM

Sunny

107° 💧 None 💨 7 mph H 15%29.74 inHg

6:00 PM

Sunny

104° 💧 None 💨 6 mph H 15%29.74 inHg

9:00 PM

Mostly clear night

97° 💧 None 💨 5 mph H 20%29.80 inHg

Wednesday

12:00 AM

Clear night

92° 💧 None 💨 3 mph H 25%29.83 inHg

Today

3:00 AM

Mostly clear night

85° 💧 None 💨 2 mph H 38%29.80 inHg

4:00 AM

Partly cloudy night

83° 💧 None 💨 2 mph H 41%29.80 inHg

5:00 AM

Partly cloudy night

82° 💧 None 💨 2 mph H 43%29.80 inHg

6:00 AM

Partly cloudy night

81° 💧 None 💨 1 mph H 45%29.83 inHg

7:00 AM

Partly cloudy

82° 💧 None 💨 2 mph H 42%29.85 inHg

8:00 AM

Partly cloudy

88° 💧 None 💨 2 mph H 33%29.85 inHg

9:00 AM

Mostly sunny

92° 💧 None 💨 3 mph H 29%29.85 inHg

10:00 AM

Mostly sunny

96° 💧 None 💨 3 mph H 23%29.85 inHg

11:00 AM

Mostly cloudy

100° 💧 None 💨 5 mph H 19%29.83 inHg

12:00 PM

Partly cloudy

102° 💧 None 💨 7 mph H 17%29.80 inHg

1:00 PM

Sunny

105° 💧 None 💨 7 mph H 16%29.77 inHg

2:00 PM

Sunny

106° 💧 None 💨 8 mph H 15%29.74 inHg

3:00 PM

Sunny

105° 💧 None 💨 12 mph H 15%29.71 inHg

4:00 PM

Mostly sunny

104° 💧 None 💨 11 mph H 16%29.68 inHg

5:00 PM

Partly cloudy

103° 💧 None 💨 12 mph H 18%29.68 inHg

6:00 PM

Mostly cloudy

101° 💧 None 💨 14 mph H 20%29.71 inHg

7:00 PM

Partly cloudy night

99° 💧 None 💨 10 mph H 21%29.74 inHg

8:00 PM

Mostly clear night

97° 💧 None 💨 9 mph H 23%29.77 inHg

9:00 PM

Mostly clear night

95° 💧 None 💨 7 mph H 25%29.77 inHg

10:00 PM

Mostly clear night

94° 💧 None 💨 7 mph H 25%29.80 inHg

11:00 PM

Mostly clear night

93° 💧 None 💨 6 mph H 26%29.80 inHg

Tomorrow

12:00 AM

Clear night

91° 💧 None 💨 5 mph H 28%29.80 inHg

1:00 AM

Clear night

89° 💧 None 💨 4 mph H 30%29.80 inHg

2:00 AM

Clear night

87° 💧 None 💨 3 mph H 33%29.77 inHg

3:00 AM

Clear night

86° 💧 None 💨 3 mph H 35%29.80 inHg

4:00 AM

Clear night

85° 💧 None 💨 3 mph H 37%29.80 inHg

5:00 AM

Clear night

84° 💧 None 💨 2 mph H 39%29.80 inHg

6:00 AM

Clear night

83° 💧 None 💨 1 mph H 40%29.83 inHg

7:00 AM

Sunny

85° 💧 None 💨 2 mph H 38%29.83 inHg

8:00 AM

Sunny

90° 💧 None 💨 2 mph H 31%29.85 inHg

9:00 AM

Sunny

94° 💧 None 💨 2 mph H 26%29.85 inHg

10:00 AM

Sunny

98° 💧 None 💨 2 mph H 23%29.85 inHg

11:00 AM

Sunny

102° 💧 None 💨 2 mph H 19%29.85 inHg

12:00 PM

Sunny

104° 💧 None 💨 5 mph H 17%29.83 inHg

1:00 PM

Sunny

106° 💧 None 💨 6 mph H 16%29.80 inHg

2:00 PM

Sunny

107° 💧 None 💨 7 mph H 15%29.77 inHg

3:00 PM

Sunny

107° 💧 None 💨 7 mph H 15%29.74 inHg

4:00 PM

Sunny

107° 💧 None 💨 7 mph H 15%29.74 inHg

5:00 PM

Sunny

106° 💧 None 💨 7 mph H 15%29.74 inHg

6:00 PM

Sunny

104° 💧 None 💨 6 mph H 15%29.74 inHg

7:00 PM

Clear night

101° 💧 None 💨 4 mph H 17%29.74 inHg

8:00 PM

Clear night

99° 💧 None 💨 3 mph H 19%29.77 inHg

9:00 PM

Mostly clear night

97° 💧 None 💨 5 mph H 20%29.80 inHg

10:00 PM

Clear night

95° 💧 None 💨 4 mph H 22%29.83 inHg

11:00 PM

Clear night

93° 💧 None 💨 3 mph H 24%29.83 inHg

Wednesday

12:00 AM

Clear night

92° 💧 None 💨 3 mph H 25%29.83 inHg

1:00 AM

Clear night

91° 💧 None 💨 3 mph H 25%29.85 inHg

2:00 AM

Clear night

90° 💧 None 💨 4 mph H 26%29.85 inHg

3:00 AM

Mostly clear night

89° 💧 None 💨 5 mph H 30%29.85 inHg

4:00 AM

Clear night

87° 💧 None 💨 4 mph H 40%29.85 inHg

5:00 AM

Clear night

85° 💧 None 💨 3 mph H 49%29.88 inHg

6:00 AM

Clear night

84° 💧 None 💨 3 mph H 55%29.88 inHg

7:00 AM

Mostly sunny

85° 💧 None 💨 3 mph H 53%29.91 inHg

8:00 AM

Mostly sunny

89° 💧 None 💨 3 mph H 48%29.94 inHg

9:00 AM

Mostly sunny

92° 💧 None 💨 4 mph H 42%29.94 inHg

10:00 AM

Mostly sunny

96° 💧 None 💨 4 mph H 36%29.94 inHg

11:00 AM

Mostly cloudy

99° 💧 None 💨 4 mph H 31%29.94 inHg

12:00 PM

Mostly cloudy

102° 💧 None 💨 5 mph H 27%29.91 inHg

1:00 PM

Mostly sunny

105° 💧 None 💨 6 mph H 24%29.88 inHg

2:00 PM

Strong thunderstorm

106° 💧 None 💨 7 mph H 21%29.83 inHg

3:00 PM

Strong thunderstorm

107° 💧 None 💨 8 mph H 19%29.80 inHg

4:00 PM

Strong thunderstorm

107° 💧 None 💨 9 mph H 18%29.77 inHg

5:00 PM

Sunny

106° 💧 None 💨 10 mph H 19%29.77 inHg

8:00 PM

Clear night

97° 💧 None 💨 13 mph H 30%29.83 inHg

11:00 PM

Clear night

93° 💧 None 💨 8 mph H 40%29.88 inHg

Thursday

2:00 AM

Mostly clear night

88° 💧 None 💨 5 mph H 54%29.88 inHg

5:00 AM

Clear night

85° 💧 None 💨 2 mph H 61%29.88 inHg

8:00 AM

Sunny

90° 💧 None 💨 3 mph H 48%29.91 inHg

11:00 AM

Sunny

99° 💧 None 💨 6 mph H 32%29.91 inHg

2:00 PM

Sunny

106° 💧 None 💨 10 mph H 22%29.77 inHg

5:00 PM

Partly cloudy

105° 💧 None 💨 8 mph H 19%29.74 inHg

8:00 PM

Mostly clear night

100° 💧 None 💨 7 mph H 23%29.74 inHg

11:00 PM

Clear night

95° 💧 None 💨 10 mph H 35%29.77 inHg

Friday

2:00 AM

Partly cloudy night

90° 💧 None 💨 6 mph H 44%29.80 inHg

5:00 AM

Clear night

87° 💧 None 💨 2 mph H 50%29.83 inHg

8:00 AM

Sunny

90° 💧 None 💨 2 mph H 46%29.83 inHg

11:00 AM

Sunny

99° 💧 None 💨 4 mph H 31%29.80 inHg

2:00 PM

Mostly sunny

105° 💧 None 💨 7 mph H 24%29.71 inHg

5:00 PM

Mostly cloudy

103° 💧 None 💨 10 mph H 25%29.65 inHg

8:00 PM

Partly cloudy night

96° 💧 None 💨 9 mph H 32%29.71 inHg

11:00 PM

Mostly clear night

92° 💧 None 💨 1 mph H 42%29.77 inHg

Saturday

2:00 AM

Clear night

87° 💧 None 💨 2 mph H 52%29.80 inHg

5:00 AM

Clear night

85° 💧 None 💨 3 mph H 58%29.80 inHg

8:00 AM

Sunny

88° 💧 None 💨 2 mph H 51%29.85 inHg

11:00 AM

Sunny

96° 💧 None 💨 2 mph H 38%29.83 inHg

2:00 PM

Mostly sunny

102° 💧 None 💨 5 mph H 29%29.77 inHg

5:00 PM

Partly cloudy

101° 💧 None 💨 8 mph H 26%29.71 inHg

11:00 PM

Partly cloudy night

92° 💧 None 💨 10 mph H 45%29.80 inHg

Sunday

5:00 AM

Clear night

85° 💧 None 💨 3 mph H 62%29.83 inHg

11:00 AM

Mostly sunny

96° 💧 None 💨 1 mph H 40%29.83 inHg

5:00 PM

Mostly cloudy

96° 💧 None 💨 5 mph H 36%29.71 inHg

11:00 PM

Partly cloudy night

89° 💧 None 💨 1 mph H 51%29.80 inHg

Monday

5:00 AM

Clear night

84° 💧 None 💨 3 mph H 65%29.83 inHg

11:00 AM

Overcast

86° 💧 None 💨 4 mph H 66%29.91 inHg

5:00 PM

Overcast

87° 💧 None 💨 3 mph H 62%29.80 inHg

11:00 PM

Overcast night

83° 💧 None 💨 2 mph H 75%29.88 inHg

Tuesday

5:00 AM

Moderate rain

75° 💧 None 💨 5 mph H 96%29.94 inHg

11:00 AM

Overcast

82° 💧 None 💨 6 mph H 72%30.00 inHg

5:00 PM

Light rain

77° 💧 None 💨 2 mph H 85%29.91 inHg

11:00 PM

Mostly cloudy night

78° 💧 None 💨 1 mph H 91%29.97 inHg

Wednesday

5:00 AM

Clear night

76° 💧 None 💨 3 mph H 95%29.94 inHg

11:00 AM

Mostly sunny

88° 💧 None 💨 3 mph H 60%30.00 inHg

5:00 PM

Mostly sunny

91° 💧 None 💨 5 mph H 50%29.88 inHg

11:00 PM

Overcast night

83° 💧 None 💨 2 mph H 68%29.94 inHg

Thursday

5:00 AM

Clear night

77° 💧 None 💨 2 mph H 87%29.94 inHg

11:00 AM

Sunny

90° 💧 None 💨 6 mph H 47%30.00 inHg

5:00 PM

Sunny

94° 💧 None 💨 4 mph H 43%29.88 inHg

11:00 PM

Clear night

85° 💧 None 💨 1 mph H 60%29.94 inHg

Friday

5:00 AM

Clear night

79° 💧 None 💨 4 mph H 71%29.94 inHg

11:00 AM

Sunny

91° 💧 None 💨 8 mph H 46%29.97 inHg

5:00 PM

Mostly sunny

95° 💧 None 💨 3 mph H 37%29.83 inHg

11:00 PM

Partly cloudy night

85° 💧 None 💨 3 mph H 60%29.88 inHg

Saturday

5:00 AM

Clear night

79° 💧 None 💨 5 mph H 69%29.88 inHg

11:00 AM

Sunny

92° 💧 None 💨 7 mph H 43%29.91 inHg

5:00 PM

Mostly sunny

93° 💧 None 💨 7 mph H 36%29.80 inHg

11:00 PM

Clear night

83° 💧 None 💨 4 mph H 57%29.85 inHg

Sunday

5:00 AM

Clear night

76° 💧 None 💨 4 mph H 74%29.85 inHg

11:00 AM

Sunny

91° 💧 None 💨 1 mph H 43%29.88 inHg

5:00 PM

Mostly sunny

96° 💧 None 💨 7 mph H 29%29.77 inHg

11:00 PM

Clear night

86° 💧 None 💨 1 mph H 45%29.83 inHg

Monday

5:00 AM

Clear night

82° 💧 None 💨 2 mph H 49%29.85 inHg

11:00 AM

Sunny

97° 💧 None 💨 4 mph H 26%29.91 inHg

5:00 PM

Mostly sunny

100° 💧 None 💨 7 mph H 16%29.77 inHg

In St. Johns and, more broadly, across the state of Arizona: Tonight will be mostly cloudy, with temperatures remaining quite warm, ranging from 89 to 94 degrees Fahrenheit. A small chance of light rain exists, with an expected accumulation of around 0.01 inches, and the probability of rain reaching about 20%. Winds will be gentle, coming from the west at up to 3 mph, with gusts reaching 4 mph. Overall, it should be a warm evening with minimal chances of rain and light breezes.

15-Day Weather Outlook for St. Johns

TomorrowTomorrow

Partly cloudy 107°/83° 💧 None 💨 14 mph

Wednesday, Sep 9Wed Sep 9

Strong thunderstorm 107°/84° 💧 None 💨 9 mph

Thursday, Sep 10Thu Sep 10

Mostly sunny 106°/85° 💧 None 💨 13 mph

Friday, Sep 11Fri Sep 11

Mostly sunny 105°/87° 💧 0.002 in 💨 10 mph

Saturday, Sep 12Sat Sep 12

Mostly cloudy 103°/85° 💧 0.002 in 💨 10 mph

Sunday, Sep 13Sun Sep 13

Mostly sunny 101°/85° 💧 0.002 in 💨 10 mph

Monday, Sep 14Mon Sep 14

Overcast 96°/84° 💧 0.139 in 💨 5 mph

Tuesday, Sep 15Tue Sep 15

Moderate rain 87°/75° 💧 0.662 in 💨 6 mph

Wednesday, Sep 16Wed Sep 16

Light rain 88°/76° 💧 0.179 in 💨 3 mph

Thursday, Sep 17Thu Sep 17

Mostly sunny 91°/77° 💧 None 💨 6 mph

Friday, Sep 18Fri Sep 18

Sunny 94°/79° 💧 None 💨 8 mph

Saturday, Sep 19Sat Sep 19

Mostly sunny 95°/79° 💧 None 💨 7 mph

Sunday, Sep 20Sun Sep 20

Mostly sunny 93°/76° 💧 0.006 in 💨 7 mph

Monday, Sep 21Mon Sep 21

Mostly sunny 97°/82° 💧 0.001 in 💨 7 mph

Tuesday, Sep 22Tue Sep 22

Mostly sunny 100°/100° 💧 0.001 in 💨 7 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

Fair

Nearest forecast value 3:00 AM

PM2.5 Fine particles Good 3,8µg/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 23,6µg/m³

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

O₃ Ozone Good 25,6µg/m³

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

NO₂ Nitrogen dioxide Good 0,5µg/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 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 9,7Very high 🙂Fair

Tomorrow UV 8,9Very high 😐Moderate

Wednesday UV 9,4Very high 🙂Fair

Thursday UV 9,4Very high 🙂Fair

Friday UV 9,0Very high 🙂Fair

Saturday UV 9,0Very high —Unavailable

Sunday UV 9,0Very high —Unavailable

Hourly UV index today

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

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.

Acceptable air quality

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

Stay hydrated

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

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

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

74/100Best-hour score

BEST TIME TONIGHT 3:00 AM–4:00 AM Astronomical darkness: 8:12 PM–4:42 AM

☁ Cloud cover 35% Real hourly forecast for the best viewing hour.

☾ Moonlight 21% Waning Crescent · Moon about 8° above the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 70° 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 min64%

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 2:06 AM. The current forecast period extends through 09/09/2026 at 12:00 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.