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Severe Thunderstorm Watch SEVERE THUNDERSTORM WATCH - Suffolk  - Nassau

Regional Radar Regional IR Satellite
Radar/Satellite images courtesy of Weather Underground.
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METRIC | IMPERIAL
Updated: 05/20/2026 @ 3:40 pm   (0 sec ago)
Temperature Current Conditions Forecast / Storm Prediction
Currently Outside: Colder 1.6°F than last hour.

86.0°F

Heat Index:  87.9°F
---
High Today
91.8°F
1:45 PM 		Low Today
64.2°F
5:43 AM
Yest High
82.4°F
1:54 PM 		Yest Low
62.6°F
5:42 AM
Rec* High
66.0°F
1991 		Rec* Low
9.0°F
2015
* Records from Weather Underground
Clear Clear

Wind from SSE Wind:  SSE
0.0
Gusting to:
 1.1 mph
Current Rain Rain:
0.00 in
Chandler Burning Index: LOW Current CBI
Fire Danger:
21.0 of 100
This
afternoon
Thunder storm
Thunder storm 		Tonight

Thunder storm
Thunder storm 		Thursday

Rain likely
Rain likely
High: 92°F Low: 57°F High: 64°F

Click here for full Forecast
SPC Activity Map
Dew Point Liquid Precipitation Wind Speed Sun/Moon
Current: Decreased 2°F since last hour. 65.2°F
Last Hour: Decreased 2°F since last hour. 2°F
High 12:37 PM: 69.3°F
Low 12:59 AM: 57.5°F
Record High: 82.2°F on
Jul-25-2025
Record Low: -14.8°F on
Jan-24-2026
Wetbulb: 72.5°F
Rain Today
rain graph
Today: 0.00 in
Yesterday: 0.00 in
Last 7 Days: 0.00 in
May Rain: 0.37 in
May Avg: 3.48 in
Diff from Avg: Under 3.11 in for the month 3.11 in
Season:1 9.540 in
Last YTD:1 16.14 in
Last Rain
Time/Date: 		May-7-2026
at 6:43 AM
46 rain days in 2026
3 days in May
12 days since last rain
Current: SSE  0.0 mph
1Hr Average: 1.7 mph
Wind Run: 11.29 miles
Wind Gust
Current: 1.1 mph
Today: 9.2 mph 2:16 PM
Month: 18.4 mph May-5
Year: 25.3 mph Mar-17
Record Gust: 38.0 mph
Mar-23-2024
Sunlight:
14 h 38 m 44 s
of Sunlight Yesterday
14 h 40 m 30 s
of Sunlight Today Which is
1 min 46 sec longer than
yesterday
14 h 42 m 12 s
of Sunlight Tomorrow
 (Noon) graph (Midnight)
 Legend

Waxing Crescent
Waxing Crescent, 3 days, 23 hours, 44 minutes in cycle
21%
Illuminated
Humidity Barometer
Current: Decreased 1% since last hour. 50%
Last Hour: Decreased 1% since last hour. 1%
High 5:52 AM: 80%
Low 1:30 PM: 45%
Record High: 99%
Jan-9-2024
Record Low: 6%
May-11-2025
Current: No Change 29.900 inHg
Last Hour: Steady
High 12:03 AM: 30.000
Low 3:02 PM: 29.900
Record High: 30.939 inHg
Dec-14-2024
Record Low: 28.981 inHg
Feb-16-2025
Cooling Degree Days Snow3 Heat Index Air
Today: 2.6
May: 18.4
2026 to Date: 24.9
Heating Degree Days
2026 to Date: 3450.4
Today: 0.00 in
Yesterday: 0.00 in
May Snow: No Change 0.00 in
May Avg: 0.00 in
Diff from Avg: 0.00 in
Season Total:2 53.60 in
Snow Depth: 4.00 in
0 snow days in May
9 snow days this season.2
First Snow of Season:
Dec-14-2025
Average 1st Snow:
19 of Dec
Current: 87.9°F
High 1:45 pm: 96.1°F
Yesterday: 84.8°F
Record: 111.7°F
Jul-25-2025
Quality
Index6:
108

Unhealthy for Sensitive Groups
Density:
1.15 kg/m3
Current UV Index Current Solar Energy9
5.0
Sunburn in
22 Minutes 		Highest:
10:05 AM
7.0
562 W/m2
74%
W/m2 ⇒ SI 		High Today:
10:33 AM
 813  W/m2
Record:
1000 W/m2
Almanac Irrigation Index5 Station All Time Records Cloud Level
Currently: Afternoon
YTD Avg Temp: 40.4°F
Sunrise: 5:30 am
Sunset: 8:06 pm
Moonrise: 8:59 am
Moonset: 11:46 pm
Full Moon: May-31-2026
New Moon: 02:55 UTC
Jun-14-2026
Updated at Midnight
Current ET: 0.26 in
7-Days Rain: 0.00 in
7-Days ET: 0.83 in
7-Day: 0.827 in water in deficit of what evaporated in last 7 days. 0.827 in
May: 1.41 in water in deficit of what evaporated this month. 1.41 in
HIGHS: LOWS:
101.5°F
Jun-24-2025 		-2.4°F
Jan-31-2026
Daytime Records
  97.7°F°F
Jun-24-2025 		  11.8°F°F
Feb-07-2026
Nitetime Records
  82.6°F°F
Jun-26-2025 		  6.3°F°F
Feb-08-2026
ICN:0 | S3C2:6 | Ajax 3.xx
ISS:Ok |
1 Rain season: Jan 1st to Dec 31st.   2 Snow season July 1st to June 30th.   3 Updated at 7:00 AM Daily..   5 Estimated amount of water needed to replace the water used by plants and evaporation from the past week. (Negative numbers mean amount of water needed, positive numbers mean excess water is present).   6 Source: New York State Department of Environmental Conservation.   9 Solar Index represents either an absolute scale of solar energy (W/m²) using the station’s recorded maximum or a percentage of computed theoretical solar maximum using the station’s location and time of day. These indices differ most when the sun is low on the horizon. The current scale is shown, and will toggle if it or the icon is clicked.  
 WXSIM Weather Forecast  -   Outlook This afternoon & Tonight
This
afternoon
Thunder storm
Thunder storm
High: 92°F 		WXSIM forecast: Partly cloudy. A slight chance of rain. Scattered thundershowers possible. Near record warmth. High 92°. UV index up to 8. Wind west-southwest around 8 mph, gusting to 17 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
 Tonight

Thunder storm
Thunder storm
Low: 57°F 		WXSIM forecast: Cloudy in the evening, becoming dense overcast after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Low 57°. Wind west around 7 mph in the evening, becoming north after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
 WXSIM Short Term Weather Forecast
Thursday

Rain likely
Rain likely 		Thursday
night
Mostly Cloudy
Mostly Cloudy 		Friday

Partly Cloudy
Partly Cloudy 		Friday
night
Mostly Cloudy
Mostly Cloudy 		Saturday

Chance rain
Chance rain 		Saturday
night
Rain likely
Rain likely 		Sunday

Rain likely
Rain likely
High: 64°F Low: 51°F High: 70°F Low: 53°F High: 63°F Low: 50°F High: 61°F