Westerly weather in September: Westerly, Rhode Island: normal highs, lows, rain and records for September
Westerly in September has a normal high of 74°F and a normal low of 57°F, a daily mean of 66°F, falling from 78°F on the 1st to 70°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 3.81 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 14°C, 97 mm of precipitation in September.
- NOAA stationWesterly State Airport
- Station IDUSW00014794
- Location41.35°N 71.80°W
- Elevation81 ft (25 m)
- From the center2 miles
- Population (town)23,288
- Census place18,528
- Jan 40° 25°
- Feb 41° 26°
- Mar 47° 32°
- Apr 57° 41°
- May 67° 50°
- Jun 75° 59°
- Jul 82° 66°
- Aug 81° 64°
- Sep 74° 57°
- Oct 64° 47°
- Nov 54° 38°
- Dec 45° 30°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Westerly in September?
The normal high is 74°F and the normal low 57°F, for a daily mean of 65.7°F. September is 6.7°F cooler than August and 10.5°F warmer than October. September is the 4th warmest month of the year in Westerly and the 4th wettest. Across the month the normal high falls 8°F, from 78°F on September 1 to 70°F on September 30. From one year to the next September's mean temperature typically moves about 1.9°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 64°F and 68°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 35%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 78°F | 61°F | 30% | 17% |
| September 8 | 77°F | 60°F | 31% | 17% |
| September 15 | 75°F | 58°F | 32% | 17% |
| September 22 | 73°F | 55°F | 33% | 18% |
| September 30 | 70°F | 52°F | 35% | 19% |
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 | 78°F | 61°F | 30% | 17% | 13 h 10 min |
| September 2 | 78°F | 61°F | 30% | 17% | 13 h 10 min |
| September 3 | 78°F | 61°F | 30% | 17% | 13 h |
| September 4 | 78°F | 61°F | 30% | 17% | 13 h |
| September 5 | 78°F | 60°F | 31% | 17% | 13 h |
| September 6 | 77°F | 60°F | 31% | 17% | 13 h |
| September 7 | 77°F | 60°F | 31% | 17% | 12 h 50 min |
| September 8 | 77°F | 60°F | 31% | 17% | 12 h 50 min |
| September 9 | 77°F | 59°F | 31% | 17% | 12 h 50 min |
| September 10 | 76°F | 59°F | 31% | 17% | 12 h 50 min |
| September 11 | 76°F | 59°F | 31% | 17% | 12 h 40 min |
| September 12 | 76°F | 58°F | 31% | 17% | 12 h 40 min |
| September 13 | 75°F | 58°F | 32% | 17% | 12 h 40 min |
| September 14 | 75°F | 58°F | 32% | 17% | 12 h 40 min |
| September 15 | 75°F | 58°F | 32% | 17% | 12 h 30 min |
| September 16 | 75°F | 57°F | 32% | 17% | 12 h 30 min |
| September 17 | 74°F | 57°F | 32% | 17% | 12 h 30 min |
| September 18 | 74°F | 57°F | 32% | 18% | 12 h 20 min |
| September 19 | 74°F | 56°F | 32% | 18% | 12 h 20 min |
| September 20 | 73°F | 56°F | 33% | 18% | 12 h 20 min |
| September 21 | 73°F | 55°F | 33% | 18% | 12 h 20 min |
| September 22 | 73°F | 55°F | 33% | 18% | 12 h 10 min |
| September 23 | 72°F | 55°F | 33% | 18% | 12 h 10 min |
| September 24 | 72°F | 54°F | 33% | 18% | 12 h 10 min |
| September 25 | 71°F | 54°F | 34% | 18% | 12 h 10 min |
| September 26 | 71°F | 54°F | 34% | 18% | 12 h |
| September 27 | 71°F | 53°F | 34% | 19% | 12 h |
| September 28 | 70°F | 53°F | 34% | 19% | 12 h |
| September 29 | 70°F | 53°F | 34% | 19% | 11 h 50 min |
| September 30 | 70°F | 52°F | 35% | 19% | 11 h 50 min |
- Normal high
- 74°FSeptember average
- Normal low
- 57°FSeptember average
- Precipitation
- 3.81 inmonth total
- Days with precipitation
- 100.01 inch or more
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 23
- Days at 80°F or more
- 5
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014794; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Westerly in September?
On a given September day the chance of 0.01 inch or more is 32% on average, highest around September 30 (35%). In all, 3.81 in falls on 10 days of a normal September, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014794.
What are the records for September in Westerly?
The warmest September temperature on this station's record (since 1999) is 92°F, on September 4, 2018; the coldest is 34°F, on September 21, 2020. The wettest September brought 8.65 in (2008).
The September mean against the 1991-2020 normal of 65.7°F: 2021 64.8°F (−0.9), 2022 64.6°F (−1.1), 2023 66.5°F (+0.8), 2024 64.3°F (−1.4), 2025 64.9°F (−0.8), 2026 64.1°F (−1.6). 1 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 64.8°F | −0.9°F | 6.61 in |
| 2022 | 64.6°F | −1.1°F | 5.17 in |
| 2023 | 66.5°F | +0.8°F | 5.19 in |
| 2024 | 64.3°F | −1.4°F | 0.87 in |
| 2025 | 64.9°F | −0.8°F | – |
| 2026 | 64.1°F | −1.6°F | 5.36 in |
Source: records: ACIS, station USW00014794; recent months: ACIS, station USW00014794. Records and recent months use complete months only.
How does September in Westerly compare across Rhode Island?
Across the 6 places PlainClimate covers in Rhode Island, September normal highs run from 72°F in Newport to 77°F in Tiverton; Westerly's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Westerly in August81°F by day, 64°F at night
- Westerly in October64°F by day, 47°F at night
- Westerly through the yearEvery month, frost dates, records and recent years
- Rhode Island in SeptemberThe statewide normal and the warmest and coolest places
- Tiverton: Rhode Island's warmest Septembernormal high 77°F