Onalaska, United States — Weather in May 2027

Climate Overview

Onalaska, United States in May has warm conditions, with highs averaging 21°C (70°F). Rain falls on about 12 days this month. Temperatures drop noticeably between day and night.

This month falls at the end of Spring.

Daily highs in May gradually rise from around 18°C (65°F) at the start to 24°C (75°F) by month's end.

May sees fairly even rainfall, totalling about 116 mm across the month.

Expect around 9.3h of sunshine at the start of May, increasing to 11.1h by the end.

The warmest days tend to fall around the 31th, averaging 24.4°C (76°F).

Compared to April, this month is about 7°C warmer with 0 fewer rainy days. Temperatures will rise further into June.

Monthly May Averages

Temperature

21°C / 11°C

Feels Like

20°C / 9°C

Rain

12 days · 116 mm

Sunshine

10.2h / day

Humidity

67% — Humid

Wind

18 km/h

Wind Direction

SSE (159°)

Gusts

39 km/h

Daylight

14.8 h

Cloud Cover

60%

Clear Sky Days

3.7

UV Index

6.2 — High

Dew Point

10°C — Dry

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 05:41

Daylight 14.7h

Sunset 20:25

What to Expect

Daytime temperatures around 21°C (70°F) are ideal for full-day outdoor exploration. Keep afternoons flexible as tropical showers are common — they typically clear within an hour.

Rain usually comes in shorter passing showers rather than all-day rain.

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	-2°C / -11°C	-7°C / -16°C	6days (34 mm) Good	5.3h Fair	75% Muggy	2 Low	Poor	View Details
February	0°C / -10°C	-4°C / -15°C	6days (36 mm) Good	7.2h Good	70% Muggy	3.2 Moderate	Poor	View Details
March	8°C / -2°C	4°C / -6°C	9days (72 mm) Wet	7.9h Good	65% Muggy	4.1 Moderate	Poor	View Details
April	14°C / 3°C	11°C / -1°C	12days (88 mm) Wet	8.4h Good	65% Muggy	4.8 Moderate	Fair	View Details
May best	21°C / 11°C	20°C / 9°C	12days (116 mm) Wet	10.2h Excellent	67% Muggy	6.2 High	Good	View Details
June best	27°C / 17°C	28°C / 17°C	13days (130 mm) Wet	11.6h Excellent	68% Muggy	6.6 High	Excellent	View Details
July best	28°C / 19°C	31°C / 20°C	10days (107 mm) Wet	12.2h Excellent	72% Muggy	6.8 High	Excellent	View Details
August best	27°C / 18°C	29°C / 19°C	11days (113 mm) Wet	10.9h Excellent	73% Muggy	6.2 High	Excellent	View Details
September best	24°C / 15°C	24°C / 14°C	9days (97 mm) Wet	9.3h Good	72% Muggy	5.1 High	Excellent	View Details
October	16°C / 8°C	13°C / 5°C	10days (88 mm) Wet	7h Good	69% Muggy	3.6 Moderate	Fair	View Details
November	7°C / 0°C	3°C / -4°C	6days (54 mm) Good	5.8h Fair	70% Muggy	2.2 Moderate	Poor	View Details
December	0°C / -7°C	-4°C / -12°C	8days (44 mm) Wet	4.9h Fair	74% Muggy	1.8 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.

Temperatures drop significantly at night, so pack layers you can add or remove throughout the day.

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

Packing List

Warm evening layerUmbrellaWaterproof jacketSunscreen (SPF 30+)SunglassesComfortable walking shoes

Frequently Asked Questions

Expand all

Is May a good time to visit Onalaska?

May is typically good for visiting Onalaska, with average highs of 21°C (70°F) and around 12 rainy days. Onalaska, United States in May has warm conditions, with highs averaging 21°C (70°F). Rain falls on about 12 days this m

Does it rain a lot in Onalaska in May?

Onalaska typically sees around 12 rainy days in May with 116 mm (4.6 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Onalaska in May?

Nights in Onalaska during May are cool at around 11°C (51°F). Bring a jacket or sweater for evenings.

What should I pack for Onalaska in May?

With highs of 21°C (70°F) and lows of 11°C (51°F) in May, we recommend: Warm evening layer, Umbrella, Waterproof jacket, Sunscreen (SPF 30+), Sunglasses. Comfortable walking shoes are essential.

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

Yes, May offers some of the best weather conditions in Onalaska with comfortable temperatures and lower chances of rain.

What is the UV index in Onalaska in May?

The average UV index in Onalaska 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 Onalaska in May?

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

Does it snow in Onalaska in May?

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

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