What should you know about Marietta's weather?
- NWS office
- Atlanta/Peachtree City (FFC)
- Climate
- Humid subtropical
- Time zone
- EST/EDT
- Elevation
- 1,127 ft
- Coordinates
- 33.95° N, 84.55° W
- Nearest radar
- KFFC · Atlanta NEXRAD · 41 mi
- County
- Cobb County, GA
- Yearly rain
- 48.1 in
- Warmest month
- July · 80.1°F average
- Coldest month
- January · 43.6°F average
- Severe storm peak
- May to Jul
How much rain does Marietta get each month?
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 53.7 | 58.4 | 65.8 | 73.9 | 81.2 | 87.1 | 90.0 | 89.1 | 83.9 | 74.5 | 64.0 | 55.9 |
| Low °F | 33.5 | 36.6 | 42.9 | 49.5 | 58.4 | 66.6 | 70.2 | 69.4 | 63.0 | 51.3 | 40.7 | 36.0 |
| Rain (in) | 4.25 | 4.34 | 4.53 | 3.61 | 3.64 | 3.84 | 5.01 | 3.98 | 3.36 | 3.59 | 3.77 | 4.21 |
| Month | High °F | Low °F | Rain (in) |
|---|---|---|---|
| Jan | 53.7 | 33.5 | 4.25 |
| Feb | 58.4 | 36.6 | 4.34 |
| Mar | 65.8 | 42.9 | 4.53 |
| Apr | 73.9 | 49.5 | 3.61 |
| May | 81.2 | 58.4 | 3.64 |
| Jun | 87.1 | 66.6 | 3.84 |
| Jul | 90.0 | 70.2 | 5.01 |
| Aug | 89.1 | 69.4 | 3.98 |
| Sep | 83.9 | 63.0 | 3.36 |
| Oct | 74.5 | 51.3 | 3.59 |
| Nov | 64.0 | 40.7 | 3.77 |
| Dec | 55.9 | 36.0 | 4.21 |
ATLANTA FULTON CO AP, GA US · 12 mi away · NOAA NCEI U.S. Climate Normals 1991 to 2020
How bad did Cobb County creeks flood in September 2009?
Several of them went well past the 500-year flood level. USGS found that flood magnitudes on Sweetwater, Butler and Powder Springs Creeks in Cobb County greatly exceeded the estimated 500-year floods for those streams. On Sweetwater Creek near Austell, the peak stage was more than 6 feet higher than the estimated 500-year flood stage. The flooding closed Interstate 20 there for more than a day after that gauge reached 30.82 feet with a peak flow of 31,500 cubic feet per second. Small creek basins like these rise quickly when rain keeps training over the same area, so watch for storms that stall on the loop.
Have tornadoes touched down in Marietta?
Yes, including a weak one in April 2006. On April 8, 2006, two tornadoes hit Cobb County: an F0 that touched down in the western part of the county skipped along and wound up in Marietta, and an F1 struck the northeast corner and continued into Fulton County. On the morning of December 29, 2024, a line of thunderstorms spawned six tornadoes across the region, and the EF-1 in Cobb County was the strongest, with winds reaching 95 mph. Tornadoes inside a fast-moving line can form quickly, so follow warnings even when the loop shows only a solid band of rain.
Can the Marietta weather radar spot tornado debris?
Sometimes, because KFFC has a dual-polarization upgrade. NWS Atlanta/Peachtree City says the upgrade lets the radar detect the nature and orientation of echoes, sometimes including debris from tornadoes. A debris signature only appears once a tornado is already lifting material, so it confirms a tornado rather than giving early warning. KFFC is about 41 miles south of Marietta, so the beam is well above the ground here and a weak, brief tornado may show no debris at all.
How much snow can fall in Marietta?
Rare storms can bring up to a foot, as the storm of December 8 and 9, 2017 did in parts of north Georgia. Its heaviest snow fell in a ribbon from Carroll County into the northwestern Atlanta suburbs, while areas southeast of Atlanta saw little accumulation. Over 10 inches piled up in the Brookstone Subdivision in Acworth. At the height of the storm, over 200,000 customers in north Georgia lost power. Radar shows where precipitation falls but not whether it reaches the ground as rain or snow, so check the hourly temperatures as well.
When should you check the Marietta radar?
Severe storm peak
May to JulyAbout 54% of the county's 1996 to 2025 severe reports fall in these months. Hail and frequent lightning come with the strongest cells, so locals check the loop before events on Marietta Square or hikes on Kennesaw Mountain.
Hurricane season
June 1 to November 30Across the Atlantic basin, most activity comes from mid-August to mid-October. Remnants of Gulf storms can bring long bands of heavy rain, so locals watch the loop and avoid low crossings along creeks such as Sope Creek.
What else do people ask about the Marietta radar?
Which NWS office and radar cover Marietta?
NWS Atlanta/Peachtree City (FFC) issues forecasts and warnings for Marietta. The nearest NEXRAD radar is KFFC, about 41 miles from the city center.
How often does the radar on this page update?
The radar loop on this page updates every 5 minutes.
Is this page an official warning service?
No. It shows radar and forecasts only. For warnings, follow NWS Atlanta/Peachtree City and local emergency alerts.
Quick facts
- Radar: KFFC (Atlanta NEXRAD), a new frame every 5 minutes
- Forecasts and warnings: NWS Atlanta/Peachtree City (FFC)
- Severe storms peak from May to July (NOAA Storm Events, 1996 to 2025)
- Local time: EST/EDT
- Radar: KFFC, a new frame every 5 minutes
- Warnings: NWS Atlanta/Peachtree City (FFC)
- Severe storms: May to July
- Local time: EST/EDT
Where does this data come from?
- NOAA NEXRAD radar via Iowa Environmental Mesonet
- National Weather Service, Atlanta/Peachtree City office
- NOAA NCEI U.S. Climate Normals 1991 to 2020: ATLANTA FULTON CO AP, GA US
- NOAA NCEI Storm Events Database, 1996 to 2025
- USGS Elevation Point Query Service
- GOES-East satellite imagery
- Open-Meteo forecast API
- OpenStreetMap contributors
- USGS: Epic flooding in Georgia, 2009 (Fact Sheet 2010-3107)
- USGS: September 2009 flood measurements (Fact Sheet 2010-3061)
- NWS Atlanta/Peachtree City: Cobb County tornadoes, April 8, 2006
- Georgia EPD: December 2024 climate summary
- NWS Atlanta/Peachtree City: December 22, 2011 tornado event
- NWS Atlanta/Peachtree City: December 8 and 9, 2017 heavy snow