Baltimore weather in September: Baltimore, Maryland: normal highs, lows, rain and records for September
Baltimore in September has a normal high of 80°F and a normal low of 59°F, a daily mean of 69°F, falling from 84°F on the 1st to 74°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 4.44 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 15°C, 113 mm of precipitation in September.
- NOAA stationBaltimore Wash International Airport
- Station IDUSW00093721
- Location39.17°N 76.68°W
- Elevation156 ft (48 m)
- From the center10 miles
- Population568,271
- Jan 43° 25°
- Feb 46° 27°
- Mar 55° 34°
- Apr 67° 44°
- May 76° 53°
- Jun 84° 63°
- Jul 89° 68°
- Aug 87° 66°
- Sep 80° 59°
- Oct 68° 47°
- Nov 57° 37°
- Dec 48° 30°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Baltimore in September?
The normal high is 80°F and the normal low 59°F, for a daily mean of 69.2°F. September is 7.0°F cooler than August and 11.8°F warmer than October. September is the 4th warmest month of the year in Baltimore and the 2nd wettest. Across the month the normal high falls 10°F, from 84°F on September 1 to 74°F on September 30. From one year to the next September's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 67°F and 71°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 30%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 84°F | 63°F | 28% | 18% |
| September 8 | 82°F | 62°F | 28% | 18% |
| September 15 | 80°F | 59°F | 29% | 18% |
| September 22 | 78°F | 57°F | 30% | 18% |
| September 30 | 74°F | 53°F | 30% | 18% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 84°F | 63°F | 28% | 18% | 13 h 10 min |
| September 2 | 84°F | 63°F | 28% | 18% | 13 h |
| September 3 | 84°F | 63°F | 28% | 18% | 13 h |
| September 4 | 84°F | 63°F | 28% | 18% | 13 h |
| September 5 | 83°F | 62°F | 28% | 18% | 13 h |
| September 6 | 83°F | 62°F | 28% | 18% | 12 h 50 min |
| September 7 | 83°F | 62°F | 28% | 18% | 12 h 50 min |
| September 8 | 82°F | 62°F | 28% | 18% | 12 h 50 min |
| September 9 | 82°F | 61°F | 28% | 18% | 12 h 50 min |
| September 10 | 82°F | 61°F | 28% | 18% | 12 h 40 min |
| September 11 | 82°F | 61°F | 29% | 18% | 12 h 40 min |
| September 12 | 81°F | 60°F | 29% | 18% | 12 h 40 min |
| September 13 | 81°F | 60°F | 29% | 18% | 12 h 40 min |
| September 14 | 81°F | 60°F | 29% | 18% | 12 h 30 min |
| September 15 | 80°F | 59°F | 29% | 18% | 12 h 30 min |
| September 16 | 80°F | 59°F | 29% | 18% | 12 h 30 min |
| September 17 | 79°F | 59°F | 29% | 18% | 12 h 30 min |
| September 18 | 79°F | 58°F | 29% | 18% | 12 h 20 min |
| September 19 | 79°F | 58°F | 29% | 18% | 12 h 20 min |
| September 20 | 78°F | 57°F | 30% | 18% | 12 h 20 min |
| September 21 | 78°F | 57°F | 30% | 18% | 12 h 20 min |
| September 22 | 78°F | 57°F | 30% | 18% | 12 h 10 min |
| September 23 | 77°F | 56°F | 30% | 18% | 12 h 10 min |
| September 24 | 77°F | 56°F | 30% | 18% | 12 h 10 min |
| September 25 | 76°F | 55°F | 30% | 18% | 12 h 10 min |
| September 26 | 76°F | 55°F | 30% | 18% | 12 h |
| September 27 | 76°F | 55°F | 30% | 18% | 12 h |
| September 28 | 75°F | 54°F | 30% | 18% | 12 h |
| September 29 | 75°F | 54°F | 30% | 18% | 11 h 50 min |
| September 30 | 74°F | 53°F | 30% | 18% | 11 h 50 min |
- Normal high
- 80°FSeptember average
- Normal low
- 59°FSeptember average
- Precipitation
- 4.44 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 3
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 27
- Days at 80°F or more
- 14
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093721; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Baltimore in September?
On a given September day the chance of 0.01 inch or more is 29% on average, highest around September 26 (30%). In all, 4.44 in falls on 9 days of a normal September, 1 of them with an inch or more.
In a normal September in Baltimore, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093721.
How humid and windy is Baltimore in September?
At 3 p.m. the normal temperature is 72°F with 52% relative humidity and a dew point of 54°F; at 6 a.m. it is 57°F with 88% humidity. The wind averages 6.0 mph, most often from the west-northwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 57°F | 54°F | 88% | 4.3 mph | 32% |
| 9 a.m. | 65°F | 55°F | 71% | 7.3 mph | 35% |
| noon | 71°F | 54°F | 56% | 8.8 mph | 29% |
| 3 p.m. | 72°F | 54°F | 52% | 8.6 mph | 26% |
| 6 p.m. | 67°F | 55°F | 65% | 5.6 mph | 34% |
| 9 p.m. | 62°F | 55°F | 79% | 4.7 mph | 48% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00093721. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Baltimore?
The warmest September temperature on Baltimore's official record (since 1872) is 101°F, on September 7, 1881; the coldest is 35°F, on September 25, 1963. The wettest September brought 13.32 in (2011).
The September mean against the 1991-2020 normal of 69.2°F: 2021 71.5°F (+2.3), 2022 70.6°F (+1.4), 2023 71.9°F (+2.7), 2024 69.4°F (+0.2), 2025 70.0°F (+0.8), 2026 71.5°F (+2.3). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 71.5°F | +2.3°F | 6.04 in |
| 2022 | 70.6°F | +1.4°F | 3.35 in |
| 2023 | 71.9°F | +2.7°F | 6.27 in |
| 2024 | 69.4°F | +0.2°F | 2.03 in |
| 2025 | 70.0°F | +0.8°F | 3.15 in |
| 2026 | 71.5°F | +2.3°F | 3.25 in |
Source: records: ACIS, NWS threaded record BWIthr; recent months: ACIS, station USW00093721. Records and recent months use complete months only.
How does September in Baltimore compare across Maryland?
Across the 26 places PlainClimate covers in Maryland, September normal highs run from 72°F in Frostburg to 82°F in Snow Hill; Baltimore's is 80°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.