Boise

Idaho Weather in May

Average temperatures, rainfall, sunshine and the best places to visit in Idaho, the United States of America in May.

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Boise Coeur d'Alene Idaho Falls Ketchum

Planning a trip to Idaho, the United States of America this May? Here's what you need to know about the weather:

What to Expect in Idaho in May

Idaho, the United States of America is a region in the United States of America. May in Idaho generally has temperatures that range from mild to warm, with precipitation levels ranging from low to moderate.

Temperatures

During the day temperatures vary from mild in Stanley at 14°C (57°F) to warm in Hagerman at 23°C (73°F). At night it cools down to 6°C (43°F) in Hagerman and -2°C (28°F) in Stanley.

For a closer look at conditions across Idaho, the United States of America, refer to the map below.

Precipitation

In May, precipitation varies across different areas. From low rainfall in Hagerman with an average of 18 mm (0.7 in) to moderate rainfall in Wallace with 72 mm (2.8 in).

Average sunshine

May brings good sunshine to many areas. Boise sees around 333 hours of sunlight, great for visitors looking for bright days.

Explore Idaho by month

Pick a month to see the average temperature, rainfall and sunshine in Idaho - and find the best time to visit. (based on Boise)

January4°C (39°F) February8°C (46°F) March13°C (55°F) April17°C (63°F) May22°C (72°F) June27°C (81°F) This monthJuly34°C (93°F) August32°C (90°F) September27°C (81°F) October19°C (66°F) November10°C (50°F) December4°C (39°F)
Best Time to Visit Idaho →

Best Places to Visit in Idaho in May

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Idaho.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Idaho

What is the weather like in May for some of the most popular destinations in Idaho, the United States of America?

Temperature range in Idaho (May)

Precipitation variation in Idaho (May)

Boise

In May Boise generally has high temperatures with maximum daytime temperatures around 22°C (72°F), minimum nighttime temperatures around 7°C (45°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

« April
May
June »
April
May
June
Max temperature
17°C (63°F)
22°C (72°F)
27°C (81°F)
Min temperature
3°C (37°F)
7°C (45°F)
11°C (52°F)
Monthly sun hours
283 hours
333 hours
348 hours
Monthly rainfall
34 mm (1.3 in)
33 mm (1.3 in)
21 mm (0.8 in)
Monthly rainy days
10 days
11 days
9 days
Weather conditions
good
excellent
excellent
Climate in Boise →

Coeur d'Alene

In May Coeur d'Alene generally has pleasant temperatures with maximum daytime temperatures around 19°C (66°F), minimum nighttime temperatures around 6°C (43°F) and moderate monthly rainfall. So on average the conditions are very good that month.

« April
May
June »
April
May
June
Max temperature
13°C (55°F)
19°C (66°F)
22°C (72°F)
Min temperature
2°C (36°F)
6°C (43°F)
10°C (50°F)
Monthly sun hours
242 hours
297 hours
322 hours
Monthly rainfall
49 mm (1.9 in)
45 mm (1.8 in)
63 mm (2.5 in)
Monthly rainy days
14 days
12 days
11 days
Weather conditions
mixed
very good
excellent
Climate in Coeur d'Alene →

Idaho Falls

In May Idaho Falls generally has pleasant temperatures with maximum daytime temperatures around 19°C (66°F), minimum nighttime temperatures around 4°C (39°F) and moderate monthly rainfall. So on average the conditions are very good that month.

« April
May
June »
April
May
June
Max temperature
14°C (57°F)
19°C (66°F)
25°C (77°F)
Min temperature
0°C (32°F)
4°C (39°F)
8°C (46°F)
Monthly rainfall
29 mm (1.1 in)
34 mm (1.3 in)
22 mm (0.9 in)
Monthly rainy days
10 days
10 days
7 days
Weather conditions
very good
very good
excellent
Climate in Idaho Falls →

Ketchum

In May Ketchum generally has moderate temperatures with maximum daytime temperatures around 16°C (61°F), minimum nighttime temperatures around 1°C (34°F) and moderate monthly rainfall. So on average the conditions are good that month.

« April
May
June »
April
May
June
Max temperature
11°C (52°F)
16°C (61°F)
21°C (70°F)
Min temperature
-3°C (27°F)
1°C (34°F)
5°C (41°F)
Monthly rainfall
39 mm (1.5 in)
34 mm (1.3 in)
31 mm (1.2 in)
Monthly rainy days
9 days
10 days
8 days
Weather conditions
mixed
good
excellent
Climate in Ketchum →

Pocatello

In May Pocatello generally has pleasant temperatures with maximum daytime temperatures around 20°C (68°F), minimum nighttime temperatures around 5°C (41°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

« April
May
June »
April
May
June
Max temperature
15°C (59°F)
20°C (68°F)
26°C (79°F)
Min temperature
1°C (34°F)
5°C (41°F)
10°C (50°F)
Monthly rainfall
34 mm (1.3 in)
38 mm (1.5 in)
29 mm (1.1 in)
Monthly rainy days
11 days
11 days
8 days
Weather conditions
good
excellent
excellent
Climate in Pocatello →

Is your destination not in the list? Have a look at all destinations in Idaho, in the United States of America.

Popular cities in May

Day & night temperatures, rainfall and average weather in Idaho in May.

City Weather Day temp Night temp Rainfall
Boise 22°C (72°F) 7°C (45°F) 33 mm (1.3 in)
Coeur d'Alene 19°C (66°F) 6°C (43°F) 45 mm (1.8 in)
Idaho Falls 19°C (66°F) 4°C (39°F) 34 mm (1.3 in)
Ketchum 16°C (61°F) 1°C (34°F) 34 mm (1.3 in)
Pocatello 20°C (68°F) 5°C (41°F) 38 mm (1.5 in)
Island Park 15°C (59°F) 0°C (32°F) 64 mm (2.5 in)

Idaho weather in May: frequently asked questions

What is the weather like in Idaho, the United States of America in May?

Idaho, the United States of America typically experiences excellent weather in May, part of the season. Daytime highs in Boise average around 22°C (72°F), and temperatures drop to about 7°C (45°F) at night.

What is the average temperature in Idaho, the United States of America in May?

Boise averages a daytime maximum of 22°C (72°F) in May, with overnight lows close to 7°C (45°F).

Does Idaho, the United States of America get a lot of rain in May?

Not particularly. Boise averages just 33 mm (1.3 in) of rain in May, making it a mostly dry month for Idaho, the United States of America.

Is May a Good Time to Visit Idaho, the United States of America?

We believe that May is one of the best times to visit Idaho, the United States of America with overall excellent weather in Boise. It's worth noting that weather conditions might differ depending on the location you visit.

On average, the best time to visit Idaho, the United States of America is in May, June, September and October with generally excellent weather in Boise. On the other hand, the weather in January, July, November and December tend to be less favorable.

Interested in more climate information?

We have much more information about the climate in Idaho.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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