Olean, United States — Weather in May 2027

Climate Overview

Olean, United States in May has mild conditions, with highs averaging 19°C (66°F) and noticeably cooler mornings. Rain falls on about 15 days this month, totalling around 112 mm.

This month falls at the end of Spring.

Daily highs in May gradually rise from around 17°C (62°F) at the start to 22°C (71°F) by month's end.

May sees fairly even rainfall, totalling about 113 mm across the month.

Expect around 6.9h of sunshine at the start of May, increasing to 9.9h by the end.

The warmest days tend to fall around the 27th, averaging 22.3°C (72°F).

Compared to April, this month is about 6°C warmer with 0 fewer rainy days. Temperatures will rise further into June.

Monthly May Averages

Temperature

19°C / 10°C

Feels Like

18°C / 8°C

Rain

15 days · 112 mm

Sunshine

9.6h / day

Humidity

75% — Humid

Wind

16 km/h

Wind Direction

SW (233°)

Gusts

41 km/h

Daylight

14.6 h

Cloud Cover

68%

Clear Sky Days

2.4

UV Index

5.8 — High

Dew Point

10°C — Dry

Moon Phase

Waxing Gibbous · 66%

Snow Days

1 days · 1.3 cm

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 05:55

Daylight 14.6h

Sunset 20:28

What to Expect

Keep afternoons flexible as tropical showers are common — they typically clear within an hour.

Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.

2 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	0°C / -7°C	-4°C / -12°C	15days (87 mm) Wet	4.5h Fair	78% Humid	1.9 Low	Poor	View Details
February	3°C / -6°C	-2°C / -11°C	13days (87 mm) Wet	5.8h Fair	75% Muggy	3 Moderate	Poor	View Details
March	7°C / -2°C	4°C / -7°C	13days (90 mm) Wet	7.3h Good	70% Muggy	4.2 Moderate	Poor	View Details
April	13°C / 3°C	11°C / 0°C	15days (114 mm) Wet	8.4h Good	70% Muggy	4.8 Moderate	Poor	View Details
May	19°C / 10°C	18°C / 8°C	15days (112 mm) Wet	9.6h Good	75% Muggy	5.8 High	Good	View Details
June best	24°C / 14°C	24°C / 14°C	13days (103 mm) Wet	11.1h Excellent	75% Muggy	6.7 High	Excellent	View Details
July best	26°C / 17°C	28°C / 18°C	14days (91 mm) Wet	11.3h Excellent	76% Humid	6.9 High	Excellent	View Details
August best	25°C / 17°C	26°C / 17°C	13days (101 mm) Wet	10.4h Excellent	77% Humid	5.9 High	Excellent	View Details
September best	22°C / 13°C	22°C / 13°C	9days (84 mm) Wet	8.8h Good	78% Humid	5 Moderate	Excellent	View Details
October	16°C / 8°C	14°C / 5°C	12days (104 mm) Wet	6.9h Fair	78% Humid	3.4 Moderate	Fair	View Details
November	8°C / 1°C	4°C / -3°C	13days (81 mm) Wet	5.3h Fair	77% Humid	2.2 Moderate	Poor	View Details
December	2°C / -4°C	-2°C / -9°C	15days (85 mm) Wet	3.9h Poor	79% Humid	1.6 Low	Poor	View Details

What to Wear

Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.

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

Packing List

Warm evening layerUmbrellaWaterproof jacketWaterproof shoes

Frequently Asked Questions

Expand all

Is May a good time to visit Olean?

May is typically good for visiting Olean, with average highs of 19°C (66°F) and around 15 rainy days. Olean, United States in May has mild conditions, with highs averaging 19°C (66°F) and noticeably cooler mornings. Rain f

Does it rain a lot in Olean in May?

Olean typically sees around 15 rainy days in May with 112 mm (4.4 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Olean in May?

Nights in Olean during May are cool at around 10°C (49°F). Bring a jacket or sweater for evenings.

What should I pack for Olean in May?

With highs of 19°C (66°F) and lows of 10°C (49°F) in May, we recommend: Warm evening layer, Umbrella, Waterproof jacket, Waterproof shoes. Comfortable walking shoes are essential.

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

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

What is the UV index in Olean in May?

The average UV index in Olean 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 Olean in May?

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

Does it snow in Olean in May?

Yes, Olean typically sees around 1 snow days in May with roughly 1 cm (1 in) of snowfall.

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