Roy, United States — Weather in May 2027

Monthly climate averages for Roy, United States. Based on 10-year ERA5 reanalysis data.

Dsa Hot-Summer Continental (dry)
7.5 /10
Good

May is a good month in Roy

Climate Overview

Roy, United States in May has warm conditions, with highs averaging 20.3°C (69°F). Temperatures drop noticeably between day and night.

This month falls at the end of Spring.

Daily highs in May gradually rise from around 19°C (65°F) at the start to 23°C (74°F) by month's end.

May sees fairly even rainfall, totalling about 49 mm across the month.

Expect around 12.3h of sunshine at the start of May, increasing to 12.9h by the end.

The warmest days tend to fall around the 31th, averaging 24°C (75°F).

Compared to April, this month is about 6°C warmer with 2 fewer rainy days. Temperatures will rise further into June.

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Monthly May Averages

Temperature
20°C / 7°C
Feels Like
19°C / 5°C
Rain
8 days · 48 mm
Sunshine
12.4h / day
Humidity
55% — Moderate
Wind
12 km/h
Wind Direction
E (93°)
Gusts
40 km/h
Daylight
14.5 h
Cloud Cover
47%
Clear Sky Days
6.5
UV Index
7.6 — Very High
Dew Point
5°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

28°C 24°C 20°C 16°C 12°C 8°C 4°C 0°C 151015202531
HighLow

Daily Precipitation

0 mm 2 mm 4 mm 6 mm 151015202531
Rainfall

Daily Sunshine

0h 4h 8h 12h 16h 151015202531
Sunshine

Daily Wind Speed

0 4 8 12 16 20 151015202531
Wind Speed
Sun Position
Sunrise 06:11
Daylight 14.5h
Sunset 20:40

What to Expect

Daytime temperatures around 20°C (69°F) are ideal for full-day outdoor exploration.

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

January
Poor
Temp
1°C / -8°C
Feels Like
-2°C / -12°C
Rain
10days (66 mm) Wet
Sun
6.7h Fair
Humidity
78% Humid
UV
2.7 Moderate
Snow Days
14days
View Details
February
Poor
Temp
3°C / -6°C
Feels Like
0°C / -10°C
Rain
9days (57 mm) Wet
Sun
7.9h Good
Humidity
72% Muggy
UV
3.4 Moderate
Snow Days
11days
View Details
March
Poor
Temp
8°C / -2°C
Feels Like
6°C / -6°C
Rain
11days (62 mm) Wet
Sun
9.4h Good
Humidity
70% Muggy
UV
5.2 High
Snow Days
11days
View Details
April
Fair
Temp
14°C / 2°C
Feels Like
12°C / -1°C
Rain
10days (57 mm) Wet
Sun
11h Excellent
Humidity
61% Muggy
UV
6.6 High
Snow Days
4days
View Details
May
Good
Temp
20°C / 7°C
Feels Like
19°C / 5°C
Rain
8days (48 mm) Wet
Sun
12.4h Excellent
Humidity
55% Moderate
UV
7.6 Very High
Snow Days
1days
View Details
June best
Excellent
Temp
28°C / 13°C
Feels Like
27°C / 12°C
Rain
3days (17 mm) Excellent
Sun
13.6h Excellent
Humidity
42% Moderate
UV
8.1 Very High
View Details
July best
Excellent
Temp
33°C / 18°C
Feels Like
32°C / 17°C
Rain
2days (6 mm) Excellent
Sun
13.4h Excellent
Humidity
35% Comfortable
UV
8.3 Very High
View Details
August best
Excellent
Temp
31°C / 16°C
Feels Like
30°C / 16°C
Rain
4days (22 mm) Good
Sun
12.5h Excellent
Humidity
40% Comfortable
UV
7.6 Very High
View Details
September best
Excellent
Temp
26°C / 12°C
Feels Like
24°C / 10°C
Rain
4days (36 mm) Good
Sun
11.1h Excellent
Humidity
46% Moderate
UV
6.2 High
View Details
October
Fair
Temp
17°C / 5°C
Feels Like
14°C / 2°C
Rain
6days (45 mm) Good
Sun
9.4h Good
Humidity
57% Moderate
UV
4.6 Moderate
Snow Days
2days
View Details
November
Poor
Temp
9°C / -1°C
Feels Like
6°C / -5°C
Rain
7days (42 mm) Good
Sun
7.6h Good
Humidity
66% Muggy
UV
3.1 Moderate
Snow Days
6days
View Details
December
Poor
Temp
3°C / -7°C
Feels Like
0°C / -11°C
Rain
10days (58 mm) Wet
Sun
6.5h Fair
Humidity
74% Muggy
UV
2.4 Moderate
Snow Days
13days
View Details
Month Temp Feels Like Rain Sun Humidity UV Status
January 1°C / -8°C -2°C / -12°C 10days (66 mm) Wet 6.7h Fair 78% Humid 2.7 Moderate Poor View Details
February 3°C / -6°C 0°C / -10°C 9days (57 mm) Wet 7.9h Good 72% Muggy 3.4 Moderate Poor View Details
March 8°C / -2°C 6°C / -6°C 11days (62 mm) Wet 9.4h Good 70% Muggy 5.2 High Poor View Details
April 14°C / 2°C 12°C / -1°C 10days (57 mm) Wet 11h Excellent 61% Muggy 6.6 High Fair View Details
May 20°C / 7°C 19°C / 5°C 8days (48 mm) Wet 12.4h Excellent 55% Moderate 7.6 Very High Good View Details
June best 28°C / 13°C 27°C / 12°C 3days (17 mm) Excellent 13.6h Excellent 42% Moderate 8.1 Very High Excellent View Details
July best 33°C / 18°C 32°C / 17°C 2days (6 mm) Excellent 13.4h Excellent 35% Comfortable 8.3 Very High Excellent View Details
August best 31°C / 16°C 30°C / 16°C 4days (22 mm) Good 12.5h Excellent 40% Comfortable 7.6 Very High Excellent View Details
September best 26°C / 12°C 24°C / 10°C 4days (36 mm) Good 11.1h Excellent 46% Moderate 6.2 High Excellent View Details
October 17°C / 5°C 14°C / 2°C 6days (45 mm) Good 9.4h Good 57% Moderate 4.6 Moderate Fair View Details
November 9°C / -1°C 6°C / -5°C 7days (42 mm) Good 7.6h Good 66% Muggy 3.1 Moderate Poor View Details
December 3°C / -7°C 0°C / -11°C 10days (58 mm) Wet 6.5h Fair 74% Muggy 2.4 Moderate 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 layerUmbrellaSunscreen (SPF 30+)SunglassesComfortable walking shoes

Frequently Asked Questions

May is typically good for visiting Roy, with average highs of 20°C (69°F) and around 8 rainy days. Roy, United States in May has warm conditions, with highs averaging 20.3°C (69°F). Temperatures drop noticeably between
Roy typically sees around 8 rainy days in May with 48 mm (1.9 in) of total rainfall. An umbrella should suffice.
Nights in Roy during May are cool at around 7°C (45°F). Bring a jacket or sweater for evenings.
With highs of 20°C (69°F) and lows of 7°C (45°F) in May, we recommend: Warm evening layer, Umbrella, Sunscreen (SPF 30+), Sunglasses, Comfortable walking shoes. Comfortable walking shoes are essential.
May is not the most favourable month weather-wise in Roy. Consider visiting during months with milder temperatures or less rainfall for a better experience.
The average UV index in Roy during May is 8 (very high). Strong sun protection is essential — SPF 50+, protective clothing, and avoid prolonged outdoor exposure during peak hours.
Roy gets approximately 15 hours of daylight per day in May, with around 12 hours of sunshine.
Yes, Roy typically sees around 1 snow days in May with roughly 1 cm (1 in) of snowfall.

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