Riverhead, United States — Weather in May 2027

Climate Overview

Riverhead, United States in May has mild conditions, with highs averaging 18°C (64°F) and noticeably cooler mornings. Rain falls on about 11 days this month. Sea temperature stays cool at 13.5°C (56°F).

This month falls at the end of Spring.

Daily highs in May gradually rise from around 16°C (61°F) at the start to 20°C (69°F) by month's end.

Rainfall is heaviest during the first third of the month, while the middle tends to be drier.

Expect around 8.6h of sunshine at the start of May, increasing to 9.9h by the end.

The warmest days tend to fall around the 28th, averaging 20.6°C (69°F).

Compared to April, this month is about 5°C warmer with 1 fewer rainy days. Temperatures will rise further into June.

Monthly May Averages

Temperature

18°C / 12°C

Feels Like

18°C / 9°C

Rain

11 days · 101 mm

Sunshine

9.9h / day

Humidity

77% — Humid

Wind

23 km/h

Wind Direction

SSW (193°)

Gusts

38 km/h

Daylight

14.5 h

Cloud Cover

64%

Clear Sky Days

3.3

UV Index

6.4 — High

Sea Temperature

14°C

Dew Point

11°C — Comfortable

Moon Phase

Waxing Gibbous · 66%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

HighLow

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 05:35

Daylight 14.5h

Sunset 20:02

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	5°C / 0°C	0°C / -6°C	10days (99 mm) Wet	6.1h Fair	69% Muggy	2.3 Moderate	Poor	View Details
February	6°C / 0°C	2°C / -6°C	10days (96 mm) Wet	6.8h Fair	71% Muggy	3.4 Moderate	Poor	View Details
March	9°C / 2°C	5°C / -3°C	10days (106 mm) Wet	8.4h Good	69% Muggy	4.6 Moderate	Poor	View Details
April	13°C / 7°C	11°C / 3°C	12days (106 mm) Wet	9.1h Good	72% Muggy	5.5 High	Fair	View Details
May	18°C / 12°C	18°C / 9°C	11days (101 mm) Wet	9.9h Good	77% Humid	6.4 High	Good	View Details
June best	24°C / 18°C	25°C / 17°C	8days (66 mm) Wet	11.4h Excellent	77% Humid	7.2 Very High	Excellent	View Details
July best	27°C / 22°C	31°C / 24°C	9days (95 mm) Wet	11.8h Excellent	78% Humid	7.4 Very High	Excellent	View Details
August best	26°C / 22°C	29°C / 23°C	10days (83 mm) Wet	10.9h Excellent	77% Humid	6.6 High	Excellent	View Details
September best	23°C / 18°C	24°C / 18°C	9days (97 mm) Wet	8.9h Good	76% Humid	5.2 High	Excellent	View Details
October	18°C / 13°C	17°C / 11°C	10days (121 mm) Wet	7.6h Good	75% Muggy	4.1 Moderate	Good	View Details
November	12°C / 7°C	9°C / 2°C	8days (85 mm) Wet	6.9h Fair	69% Muggy	2.9 Moderate	Fair	View Details
December	7°C / 2°C	3°C / -3°C	11days (132 mm) Wet	5.7h Fair	71% Muggy	2.1 Moderate	Poor	View Details

What to Wear

Bundle up with a warm coat, scarf, and closed-toe shoes. Thermal layers underneath give flexibility between indoors and outdoors.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

Warm evening layerUmbrellaWaterproof jacketComfortable walking shoes

Frequently Asked Questions

Expand all

Is May a good time to visit Riverhead?

May is typically good for visiting Riverhead, with average highs of 18°C (64°F) and around 11 rainy days. Riverhead, United States in May has mild conditions, with highs averaging 18°C (64°F) and noticeably cooler mornings. Ra

Does it rain a lot in Riverhead in May?

Riverhead typically sees around 11 rainy days in May with 101 mm (4 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Riverhead in May?

Nights in Riverhead during May are cool at around 12°C (53°F). Bring a jacket or sweater for evenings.

What should I pack for Riverhead in May?

With highs of 18°C (64°F) and lows of 12°C (53°F) in May, we recommend: Warm evening layer, Umbrella, Waterproof jacket, Comfortable walking shoes. Comfortable walking shoes are essential.

Is May among the best months weather-wise in Riverhead?

May is not the most favourable month weather-wise in Riverhead. Consider visiting during months with milder temperatures or less rainfall for a better experience.

What is the UV index in Riverhead in May?

The average UV index in Riverhead during May is 6 (high). Wear sunscreen SPF 30+, a hat, and sunglasses. Limit direct sun exposure between 10 AM and 4 PM.

How many hours of daylight are there in Riverhead in May?

Riverhead gets approximately 15 hours of daylight per day in May, with around 10 hours of sunshine.

Does it snow in Riverhead in May?

Snow is uncommon in Riverhead during May based on 10-year climate averages.

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