Lake Ronkonkoma · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Lake Ronkonkoma & neighbors — hit play
Every city on the map carries real forecast data from the same models as its city page, refreshed several times a day. The icon is the day's overall look; the number is the afternoon high.
Next 14 days at a glance
from the model forecast
Hottest day
31°
Thu, Sep 10
Coldest night
16°
Sun, Aug 30
Days with precip
7 / 14
of 14 forecast days
Nicest day
Mon, Sep 7
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
23° 17°
36% precip chance
Sat 12 – Sun 13 Sep
27° 16°
typical range
Sat 19 – Sun 20 Sep
22° 17°
typical range
Sat 26 – Sun 27 Sep
22° 15°
typical range
30 days — Lake Ronkonkoma
14 forecast + 16 climatology
Sun · Today Sunny
26°16°8.3 mm⌄
Wind14 mph SW
Gusts20 mph
UV index7 – High
Precip chance77%
Sunrise06:17
Sunset19:28
Mon · Tomorrow Mostly cloudy
25°21°2.0 mm⌄
Wind8 mph S
Gusts19 mph
UV index6 – Moderate
Precip chance66%
Sunrise06:18
Sunset19:27
Tuesday 1/9 Showers
24°21°3.0 mm⌄
Wind13 mph SE
Gusts19 mph
UV index6 – Moderate
Precip chance78%
Sunrise06:19
Sunset19:25
Wednesday 2/9 Showers
23°21°13.4 mm⌄
Wind15 mph SE
Gusts25 mph
UV index3 – Low
Precip chance92%
Sunrise06:20
Sunset19:23
Thursday 3/9 Showers
27°21°21.0 mm⌄
Wind11 mph SW
Gusts22 mph
UV index5 – Moderate
Precip chance87%
Sunrise06:21
Sunset19:22
Friday 4/9 Sunny
26°21°7%⌄
Wind12 mph NW
Gusts27 mph
UV index7 – High
Precip chance7%
Sunrise06:22
Sunset19:20
Saturday 5/9 Sunny
22°19°0.4 mm⌄
Wind13 mph NW
Gusts26 mph
UV index6 – High
Precip chance36%
Sunrise06:23
Sunset19:19
Sunday 6/9 Sunny
23°17°17%⌄
Wind12 mph NE
Gusts19 mph
UV index6 – High
Precip chance17%
Sunrise06:24
Sunset19:17
Monday 7/9 Mostly cloudy
21°18°10%⌄
Wind10 mph SE
Gusts19 mph
UV index6 – High
Precip chance10%
Sunrise06:25
Sunset19:15
Tuesday 8/9 Mostly cloudy
22°19°4.9 mm⌄
Wind21 mph S
Gusts32 mph
UV index5 – Moderate
Precip chance78%
Sunrise06:26
Sunset19:14
Wednesday 9/9 Sunny
30°21°1.4 mm⌄
Wind22 mph SW
Gusts38 mph
UV index8 – Very high
Precip chance57%
Sunrise06:27
Sunset19:12
Thursday 10/9 Sunny
31°25°6%⌄
Wind7 mph W
Gusts17 mph
UV index8 – Very high
Precip chance6%
Sunrise06:28
Sunset19:10
Friday 11/9 Sunny
28°24°8%⌄
Wind12 mph SW
Gusts24 mph
UV index7 – High
Precip chance8%
Sunrise06:29
Sunset19:09
Saturday 12/9 Sunny
27°24°8%⌄
Wind17 mph SW
Gusts39 mph
UV index7 – High
Precip chance8%
Sunrise06:30
Sunset19:07
Sunday 13/9 Rain (climatological)
20°16°9.9 mm⌄
Day≈17–23°
Night≈13–19°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
23°18°20%⌄
Day≈20–26°
Night≈15–21°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
24°19°20%⌄
Day≈21–27°
Night≈16–22°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
22°17°9.5 mm⌄
Day≈19–25°
Night≈14–20°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
20°16°20%⌄
Day≈17–23°
Night≈13–19°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
20°16°20%⌄
Day≈17–23°
Night≈13–19°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Rain (climatological)
21°17°12.7 mm⌄
Day≈18–24°
Night≈14–20°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
22°17°20%⌄
Day≈19–25°
Night≈14–20°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
22°17°20%⌄
Day≈19–25°
Night≈14–20°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Rain (climatological)
24°19°13.5 mm⌄
Day≈21–27°
Night≈16–22°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
23°18°20%⌄
Day≈20–26°
Night≈15–21°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
20°16°20%⌄
Day≈17–23°
Night≈13–19°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Rain (climatological)
20°16°11.9 mm⌄
Day≈17–23°
Night≈13–19°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
18°15°20%⌄
Day≈15–21°
Night≈12–18°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Partly cloudy (climatological)
22°17°20%⌄
Day≈19–25°
Night≈14–20°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Rain (climatological)
25°19°13.5 mm⌄
Day≈22–28°
Night≈16–22°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
How does a 30-day outlook work?
The first 14 days are a live model forecast. The back half of the month shows the typical range for those dates — useful for planning, not a literal prediction.
First 14 days: a real forecast, blended from NBM, ECMWF and GFS runs. Trust it most inside three days; by the second week treat it as a lean, not a promise.
Rest of the month: past day 14 we stop pretending to forecast and switch to the climate corridor — the range those dates have produced over three decades computed directly for Lake Ronkonkoma, with mild week-to-week wiggle.
Good question for this page: "Is late August usually humid in Chicago?" Bad question: "Do I need an umbrella on the 29th?" — three weeks out no one knows, and that's the honest answer.