Decatur, United States experiences average highs of 22°C (72°F) and lows of 13°C (55°F) throughout the year. Rainfall is moderate, averaging about 11 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have stayed broadly stable across the available records.
Decatur, United States Weather & Climate 2026
Monthly climate averages for Decatur, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Feb–Aug At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.2/10
Best: April, May, September, October
UV Index
6
High
Temperature 22°C / 13°C
Feels Like 23°C / 13°C
Rainy Days 11
Rainfall 113 mm
Sunshine 9 h
Humidity 72%
Wind Speed 15 km/h
Dew Point 13°C
Frost Days 6 days
Hottest Month
32°C
July
Avg Low23°C
Rain14days
Coldest Month
2°C
January
Avg High11°C
Rain10days
Driest Month
6days
October
Avg High24°C
Avg Low14°C
Windiest Month
18 km/h
March (Gusts 42)
Worst Time to Visit
Consider avoiding January, February, July, August due to frequent rain.
Sun Position
Sunrise 05:36
Daylight 14.5h
Sunset 20:04
Live conditions—
Decatur on the map · live conditions
Decatur, United States
- Continent
- Americas
- Country
- United States
- City
- Decatur
- Population
- 55.4K
- Elevation
- 171 m
- Coordinates
- 34.61°, -86.98°
Seasonal Breakdown
Spring
Mar–May
Avg High 22°C
Avg Low 12°C
Rain 12 days/mo
2/3 best months
Summer
Jun–Aug
Avg High 31°C
Avg Low 22°C
Rain 13 days/mo
Autumn
Sep–Nov
Avg High 23°C
Avg Low 14°C
Rain 7 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 13°C
Avg Low 4°C
Rain 11 days/mo
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: 11°C / 2°C . Feb: 15°C / 5°C . Mar: 18°C / 8°C . Apr: 22°C / 12°C . May: 26°C / 17°C . Jun: 30°C / 21°C . Jul: 32°C / 23°C . Aug: 31°C / 22°C . Sep: 29°C / 20°C . Oct: 24°C / 14°C . Nov: 17°C / 8°C . Dec: 13°C / 5°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 125 mm. Feb: 161 mm. Mar: 161 mm. Apr: 132 mm. May: 110 mm. Jun: 115 mm. Jul: 94 mm. Aug: 97 mm. Sep: 78 mm. Oct: 80 mm. Nov: 77 mm. Dec: 127 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 71%. Feb: 73%. Mar: 69%. Apr: 69%. May: 72%. Jun: 73%. Jul: 75%. Aug: 73%. Sep: 70%. Oct: 68%. Nov: 71%. Dec: 75%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 17 km/h . Feb: 18 km/h . Mar: 18 km/h . Apr: 17 km/h . May: 15 km/h . Jun: 13 km/h . Jul: 11 km/h . Aug: 11 km/h . Sep: 12 km/h . Oct: 14 km/h . Nov: 15 km/h . Dec: 16 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 6h. Mar: 8h. Apr: 10h. May: 10h. Jun: 11h. Jul: 12h. Aug: 11h. Sep: 10h. Oct: 9h. Nov: 7h. Dec: 6h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 4. Feb: UV 4. Mar: UV 6. Apr: UV 8. May: UV 9. Jun: UV 9. Jul: UV 9. Aug: UV 8. Sep: UV 7. Oct: UV 6. Nov: UV 4. Dec: UV 3.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Month-by-Month Weather Table
January
Poor 
February
Poor March
Good April best
Excellent May best
Excellent June
Fair July
Fair August
Fair September best
Excellent October best
Excellent November
Good December
Fair | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 11°C / 2°C | 8°C / -2°C | 10days (125 mm) Wet | 6.3h Fair | 71% Muggy | 3.7 Moderate | Poor | View Details |
| February | 15°C / 5°C | 13°C / 2°C | 12days (161 mm) Wet | 6.3h Fair | 73% Muggy | 4.4 Moderate | Poor | View Details |
| March | 18°C / 8°C | 17°C / 6°C | 13days (161 mm) Wet | 8h Good | 69% Muggy | 6.2 High | Good | View Details |
| April best | 22°C / 12°C | 22°C / 10°C | 10days (132 mm) Wet | 9.7h Good | 69% Muggy | 8.1 Very High | Excellent | View Details |
| May best | 26°C / 17°C | 28°C / 17°C | 12days (110 mm) Wet | 10.4h Excellent | 72% Muggy | 8.6 Very High | Excellent | View Details |
| June | 30°C / 21°C | 34°C / 23°C | 14days (115 mm) Wet | 11.4h Excellent | 73% Muggy | 9 Very High | Fair | View Details |
| July | 32°C / 23°C | 37°C / 27°C | 14days (94 mm) Wet | 11.7h Excellent | 75% Muggy | 8.8 Very High | Fair | View Details |
| August | 31°C / 22°C | 35°C / 26°C | 12days (97 mm) Wet | 10.8h Excellent | 73% Muggy | 8.1 Very High | Fair | View Details |
| September best | 29°C / 20°C | 31°C / 21°C | 8days (78 mm) Wet | 9.9h Good | 70% Muggy | 7.1 Very High | Excellent | View Details |
| October best | 24°C / 14°C | 24°C / 13°C | 6days (80 mm) Good | 8.8h Good | 68% Muggy | 5.8 High | Excellent | View Details |
| November | 17°C / 8°C | 16°C / 5°C | 8days (77 mm) Wet | 7.2h Good | 71% Muggy | 4.2 Moderate | Good | View Details |
| December | 13°C / 5°C | 11°C / 1°C | 10days (127 mm) Wet | 5.7h Fair | 75% Muggy | 3.2 Moderate | Fair | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Decatur are April, May, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Decatur, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Decatur is July, with average daytime highs of 32°C (89°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Decatur is January, with average overnight lows of 2°C (36°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Decatur is February, averaging 161mm of precipitation across 12 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Decatur runs through June, July, March, February, with the heaviest rainfall in June. Based on 10-year averages for Decatur.
Decatur receives approximately 106 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Decatur.
The least favorable months to visit Decatur are January, February, July, August, primarily due to frequent rain. For the best conditions, consider April, May, September, October instead.
The annual average UV index in Decatur is 6, classified as high. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Decatur is 72%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Decatur rarely sees significant snowfall but does experience frost, averaging 6 frost days during the colder months.
Average wind speeds in Decatur are 15 km/h (9 mph). The windiest month is March with peak winds reaching 18 km/h (11 mph) (gusts up to 42 km/h / 26 mph).
Decatur averages 6 clear-sky days per month with overall cloud cover around 56%. The clearest skies occur in October.
The annual average dew point in Decatur is 13°C (55°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Decatur 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 Decatur ranges from 13°C (55°F) to 23°C (73°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
June is not the best time to visit Decatur, with a climate score of 6.1/10. Consider visiting during April, May, September, October instead for better conditions.
For June in Decatur, pack Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). With average highs of 30°C (86°F) and 14 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.
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