Annapolis weather in September: Annapolis, Maryland: normal highs, lows, rain and records for September
Annapolis in September has a normal high of 77°F and a normal low of 65°F, a daily mean of 71°F, falling from 81°F on the 1st to 73°F by the 30th. The month brings 5.14 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 18°C, 131 mm of precipitation in September.
- NOAA stationAnnapolis Naf
- Station IDUSW00013752
- Location38.98°N 76.47°W
- Elevation8 ft (2 m)
- Population40,689
- Jan 43° 30°
- Feb 45° 32°
- Mar 53° 38°
- Apr 64° 47°
- May 73° 57°
- Jun 82° 68°
- Jul 86° 72°
- Aug 84° 71°
- Sep 77° 65°
- Oct 67° 52°
- Nov 56° 42°
- Dec 47° 34°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Annapolis in September?
The normal high is 77°F and the normal low 65°F, for a daily mean of 71.1°F. September is 6.0°F cooler than August and 11.4°F warmer than October. September is the 4th warmest month of the year in Annapolis and the wettest. Across the month the normal high falls 8°F, from 81°F on September 1 to 73°F on September 30. From one year to the next September's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 69°F and 74°F.
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 81°F | 69°F | – | – |
| September 8 | 80°F | 68°F | – | – |
| September 15 | 78°F | 65°F | – | – |
| September 22 | 76°F | 63°F | – | – |
| September 30 | 73°F | 59°F | – | – |
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 | 81°F | 69°F | – | – | 13 h |
| September 2 | 81°F | 69°F | – | – | 13 h |
| September 3 | 81°F | 69°F | – | – | 13 h |
| September 4 | 81°F | 68°F | – | – | 13 h |
| September 5 | 80°F | 68°F | – | – | 13 h |
| September 6 | 80°F | 68°F | – | – | 12 h 50 min |
| September 7 | 80°F | 68°F | – | – | 12 h 50 min |
| September 8 | 80°F | 68°F | – | – | 12 h 50 min |
| September 9 | 79°F | 67°F | – | – | 12 h 50 min |
| September 10 | 79°F | 67°F | – | – | 12 h 40 min |
| September 11 | 79°F | 67°F | – | – | 12 h 40 min |
| September 12 | 79°F | 66°F | – | – | 12 h 40 min |
| September 13 | 78°F | 66°F | – | – | 12 h 40 min |
| September 14 | 78°F | 66°F | – | – | 12 h 30 min |
| September 15 | 78°F | 65°F | – | – | 12 h 30 min |
| September 16 | 78°F | 65°F | – | – | 12 h 30 min |
| September 17 | 77°F | 65°F | – | – | 12 h 30 min |
| September 18 | 77°F | 64°F | – | – | 12 h 20 min |
| September 19 | 77°F | 64°F | – | – | 12 h 20 min |
| September 20 | 76°F | 64°F | – | – | 12 h 20 min |
| September 21 | 76°F | 63°F | – | – | 12 h 20 min |
| September 22 | 76°F | 63°F | – | – | 12 h 10 min |
| September 23 | 75°F | 62°F | – | – | 12 h 10 min |
| September 24 | 75°F | 62°F | – | – | 12 h 10 min |
| September 25 | 75°F | 61°F | – | – | 12 h 10 min |
| September 26 | 74°F | 61°F | – | – | 12 h |
| September 27 | 74°F | 61°F | – | – | 12 h |
| September 28 | 74°F | 60°F | – | – | 12 h |
| September 29 | 73°F | 60°F | – | – | 12 h |
| September 30 | 73°F | 59°F | – | – | 11 h 50 min |
- Normal high
- 77°FSeptember average
- Normal low
- 65°FSeptember average
- Precipitation
- 5.14 inmonth total
- Days at 90°F or more
- 2
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 28
- Days at 80°F or more
- 13
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013752; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Annapolis in September?
In a normal September in Annapolis, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013752.
What are the records for September in Annapolis?
The warmest September temperature on Annapolis's official record (since 1894) is 99°F, on September 8, 1939; the coldest is 37°F, on September 28, 1989. The wettest September brought 15.21 in (1999).
The September mean against the 1991-2020 normal of 71.1°F: 2021 72.3°F (+1.2), 2022 71.4°F (+0.3), 2023 71.8°F (+0.8), 2024 70.7°F (−0.4), 2025 71.1°F (at normal), 2026 72.6°F (+1.5). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 72.3°F | +1.2°F | 4.25 in |
| 2022 | 71.4°F | +0.3°F | 2.36 in |
| 2023 | 71.8°F | +0.8°F | 4.28 in |
| 2024 | 70.7°F | −0.4°F | 2.82 in |
| 2025 | 71.1°F | at normal | 2.97 in |
| 2026 | 72.6°F | +1.5°F | 3.50 in |
Source: records: ACIS, NWS threaded record NAKthr; recent months: ACIS, station USW00013752. Records and recent months use complete months only.
How does September in Annapolis 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; Annapolis's is 77°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.