Temperature
Pleasant by day, mild at night.
72°Ftypical September high
Typical range
September climate
September in Fire Island
United States · Northeast US
Warm coastal days and plenty of sun.
One of the best months here
Daytime high
72°F
Lows around 65°F
Rain
Several rainy days
Sun
9.5 h/day
Air feel
Comfortable
Sea temp
72°F
Warm sea
When to visit
Month-by-month fit
Best
Precipitation
Several rainy days. About 9 wet days, the lowest monthly average.
30%wet-day frequency
AmountWet-day chance
Sunshine
Plenty of sun this month.
9.6 hSeptember sunshine
Heat & humidity by month
ComfortableSeptember
Easy airWarm airHumid airVery humid air
Hourly temperature pattern
In September, afternoons feel about 69° and nights feel near 65°.
FreezingVery coldColdCoolComfortableWarmNight hours
Clear sky
Partly cloudy skies this month.
49%September Clear sky
Clear skyCloud
Wind pattern
Breezy conditions are typical in September. More a comfort consideration than a planning concern.
10 mphSeptember Breezy
Sea temperature
72°FSeptember sea temp
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 71°F, and early evening stays near 70°F.
Avg temp Typical range
Morning68°F
Rain15%
Cloud52%
Humid airModerate
Sun intensityLow
Best windowMidday70°F
Rain16%
Cloud55%
Humid airModerate
Sun intensityStrong
Late afternoon71°F
Rain15%
Cloud54%
Humid airModerate
Sun intensityModerate
Early evening70°F
Rain13%
Cloud51%
Humid airModerate
Sun intensityMinimal
Data tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 40 | 31 | 3.9 | 10 | 6.6 | 70 | 42 |
| Feb | 40 | 31 | 3.6 | 10 | 7.5 | 69 | 39 |
| Mar | 46 | 36 | 4.5 | 11 | 8.5 | 69 | 40 |
| Apr | 54 | 45 | 4.0 | 11 | 9.5 | 71 | 45 |
| May | 62 | 54 | 3.7 | 11 | 10.4 | 76 | 54 |
| Jun | 72 | 65 | 3.6 | 10 | 11.5 | 78 | 66 |
| Jul | 78 | 72 | 3.5 | 10 | 12.1 | 78 | 75 |
| Aug | 78 | 71 | 3.7 | 10 | 11.3 | 77 | 76 |
| Sep | 72 | 65 | 3.9 | 9 | 9.6 | 76 | 72 |
| Oct | 63 | 55 | 4.7 | 10 | 8.2 | 73 | 64 |
| Nov | 54 | 46 | 3.4 | 9 | 6.9 | 69 | 56 |
| Dec | 45 | 37 | 4.9 | 11 | 5.9 | 71 | 48 |
Similar climates
Similar
Similar travel styleLong Beach IslandUnited StatesSimilar travel styleMartha's VineyardUnited StatesSimilar travel styleNantucketUnited StatesSimilar travel styleCape MayUnited States
Want a side-by-side climate view? Compare Fire Island with Long Beach Island.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jul 31, 2026
Data & methodology