8.1 /10
Good

May is a good month in Keystone

Climate Overview

Keystone, United States in May has hot conditions, with highs reaching 29°C (84°F) and afternoons the warmest part of the day. Rain falls on about 10 days this month. Sea temperature reaches 28°C (82°F).

This month falls at the end of Spring.

Temperatures remain fairly steady throughout May, with daily highs around 29°C (84°F).

May sees fairly even rainfall, totalling about 90 mm across the month.

The warmest days tend to fall around the 31th, averaging 30.3°C (87°F).

Compared to April, this month is about 2°C warmer with 3 more rainy days.

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Monthly May Averages

Temperature
29°C / 22°C
Feels Like
33°C / 24°C
Rain
10 days · 89 mm
Sunshine
11.4h / day
Humidity
71% — Muggy
Wind
16 km/h
Wind Direction
W (278°)
Gusts
37 km/h
Daylight
13.6 h
Cloud Cover
47%
Clear Sky Days
6.8
UV Index
8.5 — Very High
Sea Temperature
28°C
Dew Point
20°C — Humid
Moon Phase
Waxing Gibbous · 66%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

36°C 33°C 30°C 27°C 24°C 21°C 18°C 151015202531
HighLow

Daily Precipitation

0 mm 2 mm 4 mm 6 mm 151015202531
Rainfall

Daily Sunshine

0h 3h 6h 9h 12h 151015202531
Sunshine

Daily Wind Speed

0 5 10 15 20 25 151015202531
Wind Speed
Sun Position
Sunrise 06:42
Daylight 13.5h
Sunset 20:14

What to Expect

Daytime temperatures around 29°C (84°F) are ideal for full-day outdoor exploration.

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

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

Compare Months

January
Good
Temp
19°C / 12°C
Feels Like
19°C / 10°C
Rain
6days (62 mm) Good
Sun
8h Good
Humidity
73% Muggy
UV
4.6 Moderate
February best
Excellent
Temp
22°C / 15°C
Feels Like
23°C / 15°C
Rain
6days (62 mm) Good
Sun
8.9h Good
Humidity
78% Humid
UV
5.8 High
March best
Excellent
Temp
24°C / 17°C
Feels Like
25°C / 16°C
Rain
6days (38 mm) Good
Sun
9.7h Good
Humidity
72% Muggy
UV
7.2 Very High
April best
Excellent
Temp
27°C / 19°C
Feels Like
29°C / 20°C
Rain
7days (58 mm) Good
Sun
10.8h Excellent
Humidity
69% Muggy
UV
8.2 Very High
May
Good
Temp
29°C / 22°C
Feels Like
33°C / 24°C
Rain
10days (89 mm) Wet
Sun
11.4h Excellent
Humidity
71% Muggy
UV
8.5 Very High
June
Wet
Temp
30°C / 25°C
Feels Like
35°C / 29°C
Rain
20days (162 mm) Wet
Sun
10.9h Excellent
Humidity
79% Humid
UV
8.4 Very High
July
Wet
Temp
31°C / 25°C
Feels Like
37°C / 30°C
Rain
24days (199 mm) Wet
Sun
10.5h Excellent
Humidity
81% Humid
UV
8.3 Very High
August
Wet
Temp
30°C / 26°C
Feels Like
37°C / 30°C
Rain
23days (190 mm) Wet
Sun
9.8h Good
Humidity
82% Humid
UV
8 Very High
September
Wet
Temp
30°C / 24°C
Feels Like
35°C / 28°C
Rain
18days (170 mm) Wet
Sun
9.6h Good
Humidity
81% Humid
UV
7.4 Very High
October
Excellent
Temp
27°C / 22°C
Feels Like
30°C / 23°C
Rain
8days (73 mm) Wet
Sun
9.5h Good
Humidity
76% Humid
UV
6.1 High
November best
Excellent
Temp
24°C / 17°C
Feels Like
25°C / 17°C
Rain
5days (36 mm) Good
Sun
8.4h Good
Humidity
74% Muggy
UV
5 Moderate
December best
Excellent
Temp
22°C / 15°C
Feels Like
22°C / 14°C
Rain
6days (53 mm) Good
Sun
7.9h Good
Humidity
77% Humid
UV
4.3 Moderate
Month Temp Feels Like Rain Sun Humidity UV Status Details
January 19°C / 12°C 19°C / 10°C 6days (62 mm) Good 8h Good 73% Muggy 4.6 Moderate Good View Details
February best 22°C / 15°C 23°C / 15°C 6days (62 mm) Good 8.9h Good 78% Humid 5.8 High Excellent View Details
March best 24°C / 17°C 25°C / 16°C 6days (38 mm) Good 9.7h Good 72% Muggy 7.2 Very High Excellent View Details
April best 27°C / 19°C 29°C / 20°C 7days (58 mm) Good 10.8h Excellent 69% Muggy 8.2 Very High Excellent View Details
May 29°C / 22°C 33°C / 24°C 10days (89 mm) Wet 11.4h Excellent 71% Muggy 8.5 Very High Good View Details
June 30°C / 25°C 35°C / 29°C 20days (162 mm) Wet 10.9h Excellent 79% Humid 8.4 Very High Wet View Details
July 31°C / 25°C 37°C / 30°C 24days (199 mm) Wet 10.5h Excellent 81% Humid 8.3 Very High Wet View Details
August 30°C / 26°C 37°C / 30°C 23days (190 mm) Wet 9.8h Good 82% Humid 8 Very High Wet View Details
September 30°C / 24°C 35°C / 28°C 18days (170 mm) Wet 9.6h Good 81% Humid 7.4 Very High Wet View Details
October 27°C / 22°C 30°C / 23°C 8days (73 mm) Wet 9.5h Good 76% Humid 6.1 High Excellent View Details
November best 24°C / 17°C 25°C / 17°C 5days (36 mm) Good 8.4h Good 74% Muggy 5 Moderate Excellent View Details
December best 22°C / 15°C 22°C / 14°C 6days (53 mm) Good 7.9h Good 77% Humid 4.3 Moderate Excellent View Details

What to Wear

Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.

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

Packing List

UmbrellaWaterproof jacketBreathable clothingSunscreen (SPF 30+)Sun hatSunglassesComfortable walking shoes

Frequently Asked Questions

May is typically good for visiting Keystone, with average highs of 29°C (84°F) and around 10 rainy days. Keystone, United States in May has hot conditions, with highs reaching 29°C (84°F) and afternoons the warmest part of th
Keystone typically sees around 10 rainy days in May with 89 mm (3.5 in) of total rainfall. An umbrella should suffice.
Nights stay pleasantly warm in Keystone during May, around 22°C (72°F). Light evening wear is sufficient.
With highs of 29°C (84°F) and lows of 22°C (72°F) in May, we recommend: Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. Comfortable walking shoes are essential.
May is not the most favourable month weather-wise in Keystone. Consider visiting during months with milder temperatures or less rainfall for a better experience.
The average UV index in Keystone during May is 9 (very high). Strong sun protection is essential — SPF 50+, protective clothing, and avoid prolonged outdoor exposure during peak hours.
Keystone gets approximately 14 hours of daylight per day in May, with around 11 hours of sunshine.
Snow is uncommon in Keystone during May based on 10-year climate averages.

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