Which is the hottest month in Idaho?

The hottest time of year in Boise, Idaho is normally July. Expect maximum daytime temperatures to reach 32°C with moderate heat and humidity.

Best time to visit Idaho

Q: When is the best time to visit Idaho?

The best time to visit Idaho (Boise) is May, June and September based on the following average weather conditions. Maximum daytime temperature = 22 - 30°C. Daily hours of sunshine = 10 hours or more.

Q: Which month has the most rain in Idaho?

In terms of rainfall, November is usually the wettest month in Boise, Idaho with 38mm on average. There are normally 10 days in November with some rain.

Q: When is it sunniest in Idaho?

The sunniest time of year in Boise, Idaho is normally July with bright sunshine on average for 86% of daylight hours; that's 13 hours of sunshine per day.

Find the best time to visit Idaho and plan your perfect trip in 2025/2026. Get holiday inspiration, weather guides, travel advice and find great deals.

Idaho by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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Top Idaho destinations

Below are the temperatures expected today at popular countries, regions and places in Idaho. Select a destination to compare today's forecast with average weather conditions.

All Idaho destinations

When is the best time to visit Idaho?

The best time to visit Idaho (Boise) is May, June and September based on the following average weather conditions.

Maximum daytime temperature = 22 - 30°C [remove]
Daily hours of sunshine = 10 hours or more [remove]

Change the criteria to reflect your weather preferences.

0.5
Jan
1
Feb
2
Mar
2.5
Apr
5
May
5
Jun
3.5
Jul
4
Aug
5
Sep
3
Oct
0.5
Nov
0
Dec

Change criteria

Max Day Temperature (°C)

2
Jan
7
Feb
12
Mar
16
Apr
22
May
27
Jun
32
Jul
31
Aug
25
Sep
18
Oct
9
Nov
3
Dec

Hours of Sunshine (daily)

4
Jan
5
Feb
8
Mar
9
Apr
11
May
12
Jun
13
Jul
12
Aug
10
Sep
8
Oct
4
Nov
3
Dec

Best time to visit

Destination

Daytime temperature

Sunshine hours

Sea temperature

Monthly rainfall

Days with some rain

Heat & humidity

The weather guide for Idaho (Boise) shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by meteoblue. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)

More about Idaho

Explore our complete guide to Idaho with the latest travel advice for travellers and holidaymakers including official updates and local travel tips for Idaho.

Essential travel guide
Travel guidance
Travel health
Travel features
Top travel deals
FAQs

Idaho travel guide - essential info

Below is a beginner's guide to Idaho with essential travel facts such as dominant language spoken, typical flight time from the UK and the local currency. You can also check whether visas are required and what plug adapter you need to pack.

Idaho - quick facts
Flight time^✝	13 hours
Time difference	UK -7 to -8 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes

Why visit Idaho?

Considering a holiday to the Idaho? Here are some of the very good reasons it makes such a wonderful holiday destination such as for its nature to ensure you get the most out of your 2025/2026 escape.

Nature

Idaho tourist information

Idaho Tourism Development

✝ = Typical flight time from the UK and visa requirements for UK travellers.

Travelling to Idaho?
Hotels Flights eSIMs Travel insurance

Idaho travel guidance

Check the latest travel guidance and advice on visiting Idaho from official government sources (in english) from around the world including entry requirements and travel restrictions.

UK traveller advice for the Idaho - UK FCDO
Irish traveller advice for the Idaho - Department of Foreign Affairs, Ireland
Canadian travel advice for the Idaho - Government of Canada
Safe travel advisories for the Idaho - Ministry of Foreign Affairs, New Zealand
Smarter traveller advice for the Idaho - Department of Foreign Affairs, Australia

Learn more about the current safety and security risks from terrorism, natural disasters and more. Read about the local laws and customs to consider when travelling around Idaho.

Note: UK FCDO - UK Foreign, Commonwealth & Development Office

Idaho travel health

Find out more about staying safe when travelling to Idaho with the latest guidance on required vaccinations and recommended medication to take with you.

Vaccines & medicines for the Idaho - CDC
Health & vaccinations for the Idaho - TravelHealthPro, NaTHNac
How to stay safe & healthy in the Idaho - Fit for Travel, Public Health Scotland

Check out the general travel tips for staying safe and healthy in Idaho, risks of preventable diseases and what to pack.

Note: CDC - Centers for Disease Control and Prevention

Idaho travel features

Do you want to learn more about Idaho? Read our latest features covering travel tips and insider destination guides on where to go and what to do in Idaho.

We don't currently have any travel features on Idaho. Discover more about holiday destinations around the world with this selection of general travel articles.

Idaho FAQs

Read our frequently asked questions about travelling to Idaho including the current entry restrictions, driving side, electrical plugs used and much more.

Which month has the most rain in Idaho?

In terms of rainfall, January is usually the wettest month in Boise, Idaho with 0mm on average. There are normally no days in January with some rain.

When is it sunniest in Idaho?

The sunniest time of year in Boise, Idaho is normally January with bright sunshine on average for 0% of daylight hours; that's 0 hours of sunshine per day.

When is the sea warmest in Idaho?

The sea is usually at its warmest in Boise, Idaho in January when the water temperature reaches 0°C.

What is the flight time to Idaho from the UK?

The flight time to Idaho from the UK is typically 13 hours.

What is the time difference between Idaho and the UK?

The time difference between Idaho and the UK is UK time-7 to UK time-8 hours.

What is the main language spoken in Idaho?

The main language spoken in Idaho is English.

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What is the currency in Idaho?

The currency in Idaho is the US Dollar (USD).

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Which plugs are used in Idaho?

Idaho uses electrical plug type A + B (120 Volts).

Which side of the road do they drive on in Idaho?

They drive on the right side of the road in Idaho.

Find out more about driving in USA with International Drivers Association^*.

Do you need a visa for Idaho?

Yes, UK passport holders do need a visa to enter Idaho.

Check USA visa requirements for all passport holders with VisaHQ^*.

Idaho travel deals

Holidays to Idaho

Check out the latest deals, discount codes and special offers on holidays to Idaho in 2025/2026. Pay low deposits and save with last minute holiday availability and free kids places.