Decatur, Alabama Weather
Decatur weather this week
Over the next 7 days in Decatur, daytime highs range from 13°C to 21°C and night-time lows from 1°C to 9°C. The warmest afternoon is likely on Saturday at 21°C, while the coolest night is expected tonight at 1°C. Temperatures trend warmer through the week, rising by about 5°C. Expect a wide gap of around 12°C between afternoon and early-morning temperatures, so mornings will feel noticeably cooler.
No significant rain is expected in Decatur this week. The highest rain chance is just 3%, on Saturday.
Winds stay mostly light this week, peaking at about 22 km/h today. UV levels stay moderate or lower, peaking at 4. Average humidity is a comfortable 49% or so.
| Day | Conditions | High / Low | Rain chance | Rain | Max wind |
|---|---|---|---|---|---|
| Today (Sunday) | Overcast | 13° / 1° | 0% | 0.0 mm | 22 km/h |
| Tomorrow (Monday) | Clear sky | 15° / 4° | 0% | 0.0 mm | 20 km/h |
| Tuesday | Clear sky | 17° / 6° | 0% | 0.0 mm | 13 km/h |
| Wednesday | Overcast | 18° / 6° | 0% | 0.0 mm | 17 km/h |
| Thursday | Overcast | 19° / 8° | 1% | 0.0 mm | 10 km/h |
| Friday | Overcast | 19° / 8° | 0% | 0.0 mm | 6 km/h |
| Saturday | Overcast | 21° / 9° | 3% | 0.0 mm | 12 km/h |
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Today's outlook for Decatur
At 01:00 local time it is 3°C in Decatur under clear skies, feeling like -1°C. Today's forecast high is 13°C and the low is 1°C, and the day overall looks overcast. Rain is unlikely today (0% chance). Winds are blowing at about 11 km/h from the north-east. Humidity is 86%.
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Climate of Decatur: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), August is usually the hottest month in Decatur, with average daytime highs around 32°C. January is the coolest, when nights typically fall to about -1°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 33°C, so the seasons feel very different from each other.
The area receives about 1400 mm of rain in a typical year. Most of it falls from November to August (around 86% of the yearly total), and December is the wettest month at roughly 151 mm.
For outdoor plans and travel, September to October usually offer the most comfortable weather in Decatur, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 9° | -1° | 119 mm | 84% |
| Feb | 12° | 1° | 135 mm | 84% |
| Mar | 17° | 5° | 125 mm | 82% |
| Apr | 22° | 10° | 125 mm | 79% |
| May | 26° | 15° | 117 mm | 78% |
| Jun | 30° | 19° | 103 mm | 75% |
| Jul | 32° | 21° | 121 mm | 73% |
| Aug | 32° | 21° | 104 mm | 70% |
| Sep | 29° | 17° | 99 mm | 70% |
| Oct | 23° | 10° | 93 mm | 71% |
| Nov | 16° | 4° | 105 mm | 76% |
| Dec | 11° | 1° | 151 mm | 84% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Decatur. Values describe typical conditions, not a forecast.
About Decatur weather
Decatur is set in Alabama's humid subtropical climate, about 122 km north of Birmingham. Summers bring hot, humid summers (June–August) with highs often above 33°C. The year winds down with mild, short winters (December–February). This page shows live, auto-refreshing weather for Decatur: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Chicago.
Frequently asked questions
Decatur is about 122 km north of Birmingham, in Alabama.
Decatur sees mild, short winters (December–February).
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Decatur's exact coordinates. No fixed schedule, the page updates whenever you load it.
August is usually the hottest month in Decatur, with average daytime highs of about 32°C and nights around 21°C.
The coldest nights come in January, when the average low is about -1°C and daytime highs reach around 9°C. Frost is possible on clear, calm nights.
Decatur receives about 1400 mm of rain in a typical year. December is the wettest month at roughly 151 mm, and the main rainy period is November to August.
September to October usually offer the most comfortable weather in Decatur, with mild daytime temperatures and little rain.
In November Decatur typically sees daytime highs near 16°C and lows near 4°C, with about 105 mm of rain over the month and average humidity around 76%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Decatur is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Decatur's day-to-day weather follows the broader pattern of Alabama described above. See the hourly weather forecast or the air quality index for more detail.