Rochester, NY weather in September
September in Rochester: mild, with frequent rain. Highs 74°F, lows 54°F, about 11 wet days. A good month for most outdoor plans.
- Normal high
- 74°F
- Normal low
- 54°F
- Wet days
- 11
- 3.2 in total
- Muggy days
- 2
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 78°F | 68°F |
| Normal low | 58°F | 49°F |
| Chance of a wet day | 34% | 40% |
| Sunrise / sunset | 6:34 am / 7:46 pm | 7:06 am / 6:54 pm |
| Daylight | 13.2 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical September day
- 6 am56°Fdew point 53°F
- 9 am63°Fdew point 55°F
- Noon69°Fdew point 55°F
- 3 pm71°Fdew point 54°F
- 6 pm67°Fdew point 54°F
- 9 pm61°Fdew point 55°F
NOAA hourly normals (local standard time) from Rochester Gtr Intl Airport (4 mi away); average wind 8 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F16 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph5 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more2 of 30
- Wet daysat least 0.01 in of rain or melted snow11 of 30
- Notable rainat least 0.10 in7 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 3.2 in; a dry September brings about 2.4 in and a wet one about 4.0 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202002: average high 79°F
- Coolest September1993: average high 68°F
- Wettest September2006: 5.4 in
- Driest September2017: 1.3 in
- Highest reading95°F (September 7, 2007)
- Lowest reading30°F (September 30, 1991)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 81°F | 74°F | 61°F |
| Normal low | 61°F | 54°F | 43°F |
| Wet days | 10 | 11 | 14 |
| Comfortable days | 11 | 16 | 10 |
| Daylight | 13.9 h | 12.5 h | 11.0 h |
Highs change by -7°F from August and -13°F into October.
Nearby alternatives in September
- Cooler: Lake Placid, NY197 mi · high 66°F · 12 wet days
How Rochester ranks in September
- Normal high306th warmest of 378 cities; 5th of 10 in New York
- Wet days338th driest of 378
- Comfortable days58th most of 342
What to pack for Rochester in September
- A rain jacket or umbrella – rain on about 11 days
Heating and cooling
September has 114 heating degree days and 72 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Rochester in September?
The normal high is 74°F and the normal low is 54°F. From 1991 to 2020 the hottest September reading was 95°F (September 7, 2007).
Does it rain a lot in Rochester in September?
About 11 days in September have at least 0.01 in of precipitation, and the normal total is 3.2 in. The wettest September in 1991-2020 was in 2006 (5.4 in); the driest was in 2017 (1.3 in).
Is September a good time to visit Rochester?
September ranks 3rd of 12 months on our comfort score for Rochester (69 out of 100). It has about 16 comfortable days and about 1 day at 90°F or hotter. The best months are May, June and September.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates and humidity and wind by hour: Rochester Gtr Intl Airport (USW00014768), 4.0 mi SW of the city center, 533 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Greater Rochester International Airport (725290-14768), 4.0 mi SW of the city center, 540 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).