When to go · United States

When to go to Boise

Twelve months of averages for Boise, and what they say about when to go.

Photo: Erin Cave, Boise Chamber of Commerce · CC BY 2.0 · Wikimedia Commons

When to go

What the averages say

Mean daily highs and lows and the month's rain, averaged over 2001 to 2020.

On these averages, Boise has a mean high between 18°C and 32°C and under 150 mm of rain in May, June and September.

Hot months (a mean high of 32°C or more): July and August.
Cold months (a mean high under 10°C): November to February.
The warmest month is July (34°C) and the coolest January (2°C). The wettest is December (65 mm) and the driest July (7 mm); about 390 mm of rain falls in a year.

How these sentences are worded

Each sentence is written from the figures by fixed rules, and says no more than they do. Mild to warm: a mean daily high from 18°C up to 32°C. Hot: 32°C or more. Cool: 10°C up to 18°C. Cold: under 10°C. Dry: under 50 mm of rain in the month; wet: 150 mm or more. Humid: a high of 25°C or more with relative humidity of 70% or more. A month is described as good for going when it is mild to warm and not wet.

Boise: highs, lows and rainHighLowRain

The year at a glance

Mild to warm and dry
Mild to warm, humid or showery
Hot
Cool
Wet
Cold

JanCold
FebCold
MarCool
AprCool
MayMild–warm, dry
JunMild–warm, dry
JulHot
AugHot
SeptMild–warm, dry
OctCool
NovCold
DecCold

Month by month

Every month in Boise

The whole year, with humidity, cloud and the sunlight reaching the ground.

Climate in Boise by month: mean daily high and low, rain, and what the month is like
Month	High	Low	Rain	Humidity	Cloud	Sunlight (kWh/m²/day)	High in Dubai	What it is like
January	2°C	-6°C	51 mm	81%	72%	1.7	23°C	Cold
February	5°C	-4°C	36 mm	73%	67%	2.7	24°C	Cold
March	11°C	0°C	47 mm	65%	66%	4	27°C	Cool
April	15°C	2°C	35 mm	58%	57%	5.5	31°C	Cool
May	21°C	7°C	38 mm	52%	53%	6.7	35°C	Mild to warm and dry
June	27°C	12°C	23 mm	44%	41%	7.5	37°C	Mild to warm and dry
July	34°C	18°C	7 mm	32%	26%	7.7	39°C	Hot
August	32°C	17°C	7 mm	29%	29%	6.7	39°C	Hot
September	26°C	12°C	14 mm	34%	33%	5.2	37°C	Mild to warm and dry
October	17°C	5°C	27 mm	49%	47%	3.5	34°C	Cool
November	8°C	-1°C	40 mm	64%	63%	2.1	29°C	Cold
December	2°C	-5°C	65 mm	78%	73%	1.4	25°C	Cold

The Dubai column is Dubai's mean daily high, for comparison.

Modelled averages for an area about 50 km across, not a weather station's record: NASA POWER climatology, 2001–2020. These data were obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program.

When to go nearby

Plan it

Plan a trip to Boise

Tell us when and who is travelling, and a person puts the flights, the stays and the rest into one quote.

Plan a trip to Boise More about Boise When to go

Month

High

Low

Rain

Humidity

Cloud

Sunlight (kWh/m²/day)

High in Dubai

What it is like

January

2°C

-6°C

51 mm

81%

72%

1.7

23°C

Cold

February

5°C

-4°C

36 mm

73%

67%

2.7

24°C

Cold

March

11°C

0°C

47 mm

65%

66%

27°C

Cool

April

15°C

2°C

35 mm

58%

57%

5.5

31°C

Cool

May

21°C

7°C

38 mm

52%

53%

6.7

35°C

Mild to warm and dry

June

27°C

12°C

23 mm

44%

41%

7.5

37°C

Mild to warm and dry

July

34°C

18°C

7 mm

32%

26%

7.7

39°C

Hot

August

32°C

17°C

7 mm

29%

6.7

39°C

Hot

September

26°C

12°C

14 mm

34%

33%

5.2

37°C

Mild to warm and dry

October

17°C

5°C

27 mm

49%

47%

3.5

34°C

Cool

November

8°C

-1°C

40 mm

64%

63%

2.1

29°C

Cold

December

2°C

-5°C

65 mm

78%

73%

1.4

25°C

Cold