Sumter, United States — Weather in May 2027

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

Cfa Humid Subtropical
8.7 /10
Excellent

May is an excellent month in Sumter

Climate Overview

Sumter, United States in May has warm conditions, with highs averaging 27.8°C (82°F). Rain falls on about 10 days this month.

This month falls at the end of Spring.

Temperatures remain fairly steady throughout May, with daily highs around 28°C (82°F).

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

Expect around 11.3h of sunshine at the start of May, decreasing to 9.8h by the end.

The warmest days tend to fall around the 28th, averaging 28.8°C (84°F).

Compared to April, this month is about 4°C warmer with 2 more rainy days. Temperatures will rise further into June.

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Monthly May Averages

Temperature
28°C / 18°C
Feels Like
29°C / 18°C
Rain
10 days · 100 mm
Sunshine
10.4h / day
Humidity
67% — Humid
Wind
18 km/h
Wind Direction
SW (216°)
Gusts
37 km/h
Daylight
13.9 h
Cloud Cover
58%
Clear Sky Days
4.6
UV Index
7.2 — Very High
Dew Point
16°C — Humid
Moon Phase
Waxing Gibbous · 66%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

36°C 32°C 28°C 24°C 20°C 16°C 12°C 8°C 151015202531
HighLow

Daily Precipitation

0 mm 2 mm 4 mm 6 mm 8 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 06:22
Daylight 13.9h
Sunset 20:17

What to Expect

Daytime temperatures around 28°C (82°F) are ideal for full-day outdoor exploration.

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

Recent yearly records for May have stayed close to the long-run average.

Compare Months

January
Fair
Temp
14°C / 4°C
Feels Like
11°C / 1°C
Rain
10days (89 mm) Wet
Sun
6.8h Fair
Humidity
69% Muggy
UV
3.6 Moderate
Snow Days
1days
View Details
February
Fair
Temp
17°C / 7°C
Feels Like
15°C / 4°C
Rain
8days (79 mm) Wet
Sun
7h Good
Humidity
70% Muggy
UV
4.3 Moderate
View Details
March
Good
Temp
20°C / 10°C
Feels Like
19°C / 7°C
Rain
9days (82 mm) Wet
Sun
8.4h Good
Humidity
64% Muggy
UV
5.8 High
View Details
April best
Excellent
Temp
24°C / 13°C
Feels Like
24°C / 12°C
Rain
8days (88 mm) Wet
Sun
10.3h Excellent
Humidity
63% Muggy
UV
7.2 Very High
View Details
May best
Excellent
Temp
28°C / 18°C
Feels Like
29°C / 18°C
Rain
10days (100 mm) Wet
Sun
10.4h Excellent
Humidity
67% Muggy
UV
7.2 Very High
View Details
June
Fair
Temp
31°C / 22°C
Feels Like
34°C / 24°C
Rain
13days (100 mm) Wet
Sun
11.5h Excellent
Humidity
71% Muggy
UV
8 Very High
View Details
July
Poor
Temp
32°C / 24°C
Feels Like
37°C / 28°C
Rain
17days (131 mm) Wet
Sun
11.5h Excellent
Humidity
75% Muggy
UV
8 Very High
View Details
August
Fair
Temp
31°C / 23°C
Feels Like
35°C / 27°C
Rain
16days (133 mm) Wet
Sun
10.3h Excellent
Humidity
77% Humid
UV
7.3 Very High
View Details
September best
Excellent
Temp
29°C / 21°C
Feels Like
32°C / 22°C
Rain
9days (118 mm) Wet
Sun
9.8h Good
Humidity
72% Muggy
UV
6.5 High
View Details
October best
Excellent
Temp
25°C / 15°C
Feels Like
25°C / 15°C
Rain
6days (69 mm) Good
Sun
8.6h Good
Humidity
70% Muggy
UV
5.1 High
View Details
November
Good
Temp
19°C / 10°C
Feels Like
18°C / 7°C
Rain
7days (59 mm) Good
Sun
7.6h Good
Humidity
67% Muggy
UV
3.9 Moderate
View Details
December
Fair
Temp
15°C / 6°C
Feels Like
13°C / 3°C
Rain
10days (110 mm) Wet
Sun
6.3h Fair
Humidity
72% Muggy
UV
3.1 Moderate
View Details
Month Temp Feels Like Rain Sun Humidity UV Status
January 14°C / 4°C 11°C / 1°C 10days (89 mm) Wet 6.8h Fair 69% Muggy 3.6 Moderate Fair View Details
February 17°C / 7°C 15°C / 4°C 8days (79 mm) Wet 7h Good 70% Muggy 4.3 Moderate Fair View Details
March 20°C / 10°C 19°C / 7°C 9days (82 mm) Wet 8.4h Good 64% Muggy 5.8 High Good View Details
April best 24°C / 13°C 24°C / 12°C 8days (88 mm) Wet 10.3h Excellent 63% Muggy 7.2 Very High Excellent View Details
May best 28°C / 18°C 29°C / 18°C 10days (100 mm) Wet 10.4h Excellent 67% Muggy 7.2 Very High Excellent View Details
June 31°C / 22°C 34°C / 24°C 13days (100 mm) Wet 11.5h Excellent 71% Muggy 8 Very High Fair View Details
July 32°C / 24°C 37°C / 28°C 17days (131 mm) Wet 11.5h Excellent 75% Muggy 8 Very High Poor View Details
August 31°C / 23°C 35°C / 27°C 16days (133 mm) Wet 10.3h Excellent 77% Humid 7.3 Very High Fair View Details
September best 29°C / 21°C 32°C / 22°C 9days (118 mm) Wet 9.8h Good 72% Muggy 6.5 High Excellent View Details
October best 25°C / 15°C 25°C / 15°C 6days (69 mm) Good 8.6h Good 70% Muggy 5.1 High Excellent View Details
November 19°C / 10°C 18°C / 7°C 7days (59 mm) Good 7.6h Good 67% Muggy 3.9 Moderate Good View Details
December 15°C / 6°C 13°C / 3°C 10days (110 mm) Wet 6.3h Fair 72% Muggy 3.1 Moderate Fair 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 excellent for visiting Sumter, with average highs of 28°C (82°F) and around 10 rainy days. Sumter, United States in May has warm conditions, with highs averaging 27.8°C (82°F). Rain falls on about 10 days this m
Sumter typically sees around 10 rainy days in May with 100 mm (3.9 in) of total rainfall. An umbrella should suffice.
Evenings in Sumter during May are mild at 18°C (64°F). A light cardigan is usually enough.
With highs of 28°C (82°F) and lows of 18°C (64°F) in May, we recommend: Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. Comfortable walking shoes are essential.
Yes, May offers some of the best weather conditions in Sumter with comfortable temperatures and lower chances of rain.
The average UV index in Sumter during May is 7 (high). Wear sunscreen SPF 30+, a hat, and sunglasses. Limit direct sun exposure between 10 AM and 4 PM.
Sumter gets approximately 14 hours of daylight per day in May, with around 10 hours of sunshine.
Snow is uncommon in Sumter during May based on 10-year climate averages.

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