Baltimore climate
Baltimore is warmest in July, with average highs of 30 °C, and coldest in January, when nights average -2.4 °C. September is the wettest month (125 mm) and February the driest (81 mm). Figures are 1991–2020 climate normals.
Across a full year Baltimore averages 1,219 mm of rain, 109 days above 25 °C and 74 days below freezing.
United States · 10 m elevation · population 585,708 · 1991–2020 normals
Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month
- Warmest month July 30 °C
- Coldest month January -2.4 °C
- Driest month February 81 mm
- Wettest month September 125 mm
- Least cloud October 49 % cloud
- Hottest on record July 40 °C
- Coldest on record January -25 °C
- Warmest sea August 26 °C
What to expectBaltimore through the year
Baltimore has a clear annual cycle: average daily highs run from 5.1 °C in January to 30 °C in July, a swing of 24 °C in mean temperature across the year.
Counted across a normal year, 109 days a year reach 25 °C, 35 of them reach 30 °C, 74 nights drop below freezing. The warmest reading in the 1991–2020 record is 40 °C, in July.
Rain is spread fairly evenly through the year, from 81 mm in February to 125 mm in September. There is no dry season to aim for.
The sea off Baltimore is warmest in August at 26 °C and coldest in February at 2.3 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 5.1 °C | 90 mm | 58 % |
| February | 6.8 °C | 81 mm | 57 % |
| March | 11.3 °C | 114 mm | 58 % |
| April | 17.7 °C | 97 mm | 58 % |
| May | 22.5 °C | 101 mm | 58 % |
| June | 27.3 °C | 98 mm | 57 % |
| July | 29.8 °C | 109 mm | 53 % |
| August | 28.7 °C | 102 mm | 52 % |
| September | 25.1 °C | 125 mm | 52 % |
| October | 18.9 °C | 104 mm | 49 % |
| November | 12.7 °C | 88 mm | 53 % |
| December | 7.4 °C | 109 mm | 58 % |
Temperature month by month
| Month | Avg high | Avg low | Mean | Record high | Record low | Days above 25 °C | Days above 30 °C | Days below 0 °C |
|---|---|---|---|---|---|---|---|---|
| January | 5.1 °C | -2.4 °C | 0.9 °C | 20.5 °C | -24.6 °C | 0 | 0 | 22 |
| February | 6.8 °C | -2.0 °C | 1.8 °C | 26.0 °C | -23.5 °C | 0 | 0 | 19 |
| March | 11.3 °C | 1.7 °C | 6.0 °C | 26.8 °C | -18.3 °C | 0 | 0 | 12 |
| April | 17.7 °C | 7.4 °C | 12.1 °C | 31.9 °C | -3.5 °C | 2 | 0 | 1 |
| May | 22.5 °C | 12.9 °C | 17.4 °C | 33.5 °C | 0.5 °C | 9 | 2 | 0 |
| June | 27.3 °C | 18.1 °C | 22.5 °C | 38.2 °C | 8.1 °C | 22 | 7 | 0 |
| July | 29.8 °C | 21.0 °C | 25.2 °C | 40.1 °C | 13.3 °C | 29 | 14 | 0 |
| August | 28.7 °C | 20.3 °C | 24.3 °C | 36.1 °C | 12.8 °C | 28 | 9 | 0 |
| September | 25.1 °C | 16.9 °C | 20.7 °C | 34.3 °C | 7.1 °C | 15 | 3 | 0 |
| October | 18.9 °C | 10.6 °C | 14.3 °C | 34.7 °C | 0.0 °C | 3 | 0 | 0 |
| November | 12.7 °C | 4.7 °C | 8.2 °C | 24.9 °C | -5.4 °C | 0 | 0 | 5 |
| December | 7.4 °C | 0.2 °C | 3.3 °C | 23.0 °C | -14.0 °C | 0 | 0 | 16 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind | Sea temp |
|---|---|---|---|---|---|---|---|
| January | 90 mm | 9 | 9.7 h/day | 58 % | 68 % | 22 km/h | 3.2 °C |
| February | 81 mm | 9 | 11 h/day | 57 % | 67 % | 22 km/h | 2.3 °C |
| March | 114 mm | 10 | 12 h/day | 58 % | 67 % | 22 km/h | 4.2 °C |
| April | 97 mm | 10 | 13 h/day | 58 % | 68 % | 21 km/h | 8.5 °C |
| May | 101 mm | 11 | 14 h/day | 58 % | 72 % | 18 km/h | 14.2 °C |
| June | 98 mm | 11 | 15 h/day | 57 % | 72 % | 17 km/h | 20.2 °C |
| July | 109 mm | 12 | 15 h/day | 53 % | 71 % | 16 km/h | 24.7 °C |
| August | 102 mm | 11 | 14 h/day | 52 % | 73 % | 15 km/h | 25.7 °C |
| September | 125 mm | 9 | 12 h/day | 52 % | 73 % | 18 km/h | 23.3 °C |
| October | 104 mm | 8 | 11 h/day | 49 % | 73 % | 19 km/h | 18.2 °C |
| November | 88 mm | 8 | 10 h/day | 53 % | 71 % | 20 km/h | 11.9 °C |
| December | 109 mm | 9 | 9.4 h/day | 58 % | 72 % | 21 km/h | 6.8 °C |
Where Baltimore ranks
| Ranking | Position | Value |
|---|---|---|
| Places with the best weather in North America in May | 45thof 50 | 86/100 |
Planning a trip? See the best time to visit Baltimore.
QuestionsCommon questions about Baltimore’s climate
When is the best time to visit Baltimore?
That depends on what you want, so the honest answer is a comparison rather than a single month. May, June, September sit closest to 20 °C on average, July is the warmest month and February the driest. The month-by-month table above has the full picture.
How hot does Baltimore get?
In July, the warmest month, daily highs average 30 °C. About 35 days a year pass 30 °C. The highest value in the 1991–2020 record is 40 °C.
How cold does it get in winter?
Nights average -2.4 °C in January, the coldest month. A normal year has 74 nights below freezing.
Which month is wettest in Baltimore?
September, averaging 125 mm over 9 days with rain. The driest month is February with 81 mm. The year as a whole averages 1,219 mm.
Are these figures a forecast?
No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Baltimore rather than what any particular week will bring. Individual years can differ substantially from the normal.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.