St. Johns, United States experiences average highs of 25°C (77°F) and lows of 19°C (66°F) throughout the year. Rainfall is moderate, averaging about 12 rainy days per month. Sunshine is abundant, averaging about 10 hours per day. Average highs have stayed broadly stable across the available records.
St. Johns, United States Weather & Climate 2026
Monthly climate averages for St. Johns, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: May–Oct At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.6/10
Best: March, April, October, November, December
UV Index
6
High
Temperature 25°C / 19°C
Feels Like 28°C / 20°C
Rainy Days 12
Rainfall 96 mm
Sunshine 10 h
Humidity 77%
Wind Speed 17 km/h
Dew Point 18°C
Hottest Month
31°C
July
Avg Low25°C
Rain21days
Coldest Month
11°C
January
Avg High18°C
Rain7days
Driest Month
6days
November
Avg High22°C
Avg Low16°C
Windiest Month
19 km/h
April (Gusts 39)
Worst Time to Visit
Consider avoiding July, August due to extreme heat, heavy rainfall, oppressive humidity.
Sun Position
Sunrise 06:26
Daylight 14.1h
Sunset 20:30
Live conditions—
St. Johns on the map · live conditions
St. Johns, United States
- Continent
- Americas
- Country
- United States
- City
- St. Johns
- Population
- 40K
- Coordinates
- 30.08°, -81.55°
Seasonal Breakdown
Spring
Mar–May
Avg High 26°C
Avg Low 18°C
Rain 8 days/mo
2/3 best months
Summer
Jun–Aug
Avg High 31°C
Avg Low 25°C
Rain 21 days/mo
Autumn
Sep–Nov
Avg High 26°C
Avg Low 20°C
Rain 11 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 20°C
Avg Low 12°C
Rain 7 days/mo
1/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 18°C / 11°C . Feb: 21°C / 13°C . Mar: 23°C / 15°C . Apr: 25°C / 18°C . May: 29°C / 21°C . Jun: 30°C / 24°C . Jul: 31°C / 25°C . Aug: 31°C / 25°C . Sep: 29°C / 24°C . Oct: 26°C / 21°C . Nov: 22°C / 16°C . Dec: 20°C / 13°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 57 mm. Feb: 58 mm. Mar: 58 mm. Apr: 66 mm. May: 83 mm. Jun: 131 mm. Jul: 151 mm. Aug: 162 mm. Sep: 156 mm. Oct: 115 mm. Nov: 57 mm. Dec: 58 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 73%. Feb: 77%. Mar: 72%. Apr: 71%. May: 73%. Jun: 80%. Jul: 82%. Aug: 84%. Sep: 82%. Oct: 77%. Nov: 77%. Dec: 78%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 18 km/h . Feb: 17 km/h . Mar: 18 km/h . Apr: 19 km/h . May: 17 km/h . Jun: 16 km/h . Jul: 14 km/h . Aug: 15 km/h . Sep: 17 km/h . Oct: 18 km/h . Nov: 17 km/h . Dec: 17 km/h .
Sunshine
Sunshine
Sunshine: Jan: 8h. Feb: 9h. Mar: 10h. Apr: 11h. May: 12h. Jun: 11h. Jul: 12h. Aug: 11h. Sep: 10h. Oct: 9h. Nov: 8h. Dec: 8h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 4. Feb: UV 5. Mar: UV 7. Apr: UV 8. May: UV 8. Jun: UV 8. Jul: UV 8. Aug: UV 8. Sep: UV 7. Oct: UV 6. Nov: UV 5. Dec: UV 4.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 32°C | Jul · 31°C |
| Coldest month | Jan 2025 · 7°C | Jan · 11°C |
| Wettest month | Aug 2025 · 287 mm | Aug · 162 mm |
| Windiest month | Mar 2025 · 20 km/h | Apr · 19 km/h |
Month-by-Month Weather Table
January
Good 
February
Good March best
Excellent April best
Excellent May
Good June
Wet July
Wet August
Wet September
Fair October best
Excellent November best
Excellent December best
Excellent | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 18°C / 11°C | 17°C / 8°C | 7days (57 mm) Good | 7.7h Good | 73% Muggy | 4.1 Moderate | Good | View Details |
| February | 21°C / 13°C | 21°C / 12°C | 7days (58 mm) Good | 8.5h Good | 77% Humid | 5.3 High | Good | View Details |
| March best | 23°C / 15°C | 23°C / 14°C | 7days (58 mm) Good | 9.5h Good | 72% Muggy | 6.6 High | Excellent | View Details |
| April best | 25°C / 18°C | 27°C / 18°C | 8days (66 mm) Wet | 10.8h Excellent | 71% Muggy | 7.9 Very High | Excellent | View Details |
| May | 29°C / 21°C | 31°C / 23°C | 10days (83 mm) Wet | 11.6h Excellent | 73% Muggy | 7.9 Very High | Good | View Details |
| June | 30°C / 24°C | 35°C / 28°C | 18days (131 mm) Wet | 11.4h Excellent | 80% Humid | 8.2 Very High | Wet | View Details |
| July | 31°C / 25°C | 37°C / 30°C | 21days (151 mm) Wet | 11.6h Excellent | 82% Humid | 8.2 Very High | Wet | View Details |
| August | 31°C / 25°C | 37°C / 30°C | 23days (162 mm) Wet | 10.8h Excellent | 84% Humid | 7.9 Very High | Wet | View Details |
| September | 29°C / 24°C | 33°C / 27°C | 17days (156 mm) Wet | 9.7h Good | 82% Humid | 6.8 High | Fair | View Details |
| October best | 26°C / 21°C | 28°C / 22°C | 11days (115 mm) Wet | 9.3h Good | 77% Humid | 5.6 High | Excellent | View Details |
| November best | 22°C / 16°C | 23°C / 16°C | 6days (57 mm) Good | 8.2h Good | 77% Humid | 4.6 Moderate | Excellent | View Details |
| December best | 20°C / 13°C | 20°C / 12°C | 6days (58 mm) Good | 7.5h Good | 78% Humid | 3.8 Moderate | Excellent | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit St. Johns are March, April, October, November, December, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for St. Johns, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in St. Johns is July, with average daytime highs of 31°C (88°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in St. Johns is January, with average overnight lows of 11°C (51°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in St. Johns is August, averaging 162mm of precipitation across 23 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in St. Johns runs through August, July, June, September, with the heaviest rainfall in August. Based on 10-year averages for St. Johns.
St. Johns receives approximately 117 sunshine hours per year. The sunniest month is May with around 12 hours. Based on climate data for St. Johns.
The least favorable months to visit St. Johns are July, August, primarily due to extreme heat, heavy rainfall, oppressive humidity. For the best conditions, consider March, April, October, November, December instead.
The annual average UV index in St. Johns is 6, classified as high. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in St. Johns is 77%, classified as humid. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Average wind speeds in St. Johns are 17 km/h (11 mph). The windiest month is April with peak winds reaching 19 km/h (12 mph) (gusts up to 39 km/h / 24 mph).
St. Johns averages 5 clear-sky days per month with overall cloud cover around 56%. The clearest skies occur in March.
The annual average dew point in St. Johns is 18°C (64°F), which feels noticeably humid. Summer months may feel slightly sticky, but conditions remain manageable for most people.
St. Johns has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in St. Johns ranges from 20°C (68°F) to 28°C (82°F) on average. Humidity and radiant heat mean it often feels warmer than the thermometer reads, especially in summer months.
June is not the best time to visit St. Johns, with a climate score of 4.3/10. Consider visiting during March, April, October, November, December instead for better conditions.
For June in St. Johns, pack Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). With average highs of 30°C (86°F) and 18 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
Last updated: