Caldwell, ID weather and climate in 2025
Day
19 °C
Night
3 °C
Sea
0 °C
Precipitation
18 mm
in month
Rainy days
5 days
in month
Daylight
11 hours
average
Sunshine
8 hours
average
Humidity
54 %
Day
19 °C
Night
3 °C
Sea
0 °C
Precipitation
18 mm
in month
Rainy days
5 days
in month
Daylight
11 hours
average
Sunshine
8 hours
average
Humidity
54 %
Overview: Caldwell, ID
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Weather overview for Caldwell, ID
Weather overview
Caldwell, Idaho boasts a semi-arid climate with four distinct seasons. The warmest months are July and August, with temperatures often soaring to around 33 °C (92 °F). January and December bring colder days, with highs around 3 °C (38 °F) and 4 °C (38 °F) respectively. Despite being semi-arid, Caldwell receives a fair amount of precipitation, especially in the winter months with January's rainfall reaching 37 mm (1.44 in). Cold nights are typical throughout the year, dipping to -5 °C (22 °F) in January.
January weather
January in Caldwell greets you with chilly winter airs, as daytime highs hover around 3 °C (38 °F), and night temperatures often plunge to -5 °C (22 °F). With an average of 10 days of rain or snow, it's essential to keep warm layers handy.
February weather
February starts to hint at the approaching spring with a slight uptick in daily temperatures to 8 °C (46 °F) and the nights still crisp at -4 °C (25 °F). Caldwell typically sees around 8 days of rainfall, so keeping an umbrella would be prudent.
March weather
March in Caldwell welcomes the spring season, with daytime temperatures reaching up to 14 °C (57 °F). The nights remain cool at an average of 0 °C (32 °F). Expect the gentle touch of the spring breeze, as winds average 3 m/s, and consider a light jacket with 9 days of intermittent rain.
April weather
April sees further warming in Caldwell, with average highs reaching a comfortable 18 °C (65 °F). Nighttimes call for a medium-weight blanket, with lows averaging 3 °C (37 °F). As the last of the spring rains tally up to 8 days, the landscapes turn green, and outdoor lovers rejoice.
May weather
May's spring fervor continues as Caldwell enjoys daytime highs averaging at 23 °C (73 °F). The increased sunshine leads to longer days perfect for outdoor activities, though the nights cool down to an average of 7 °C (44 °F). A mild 7 days of rainfall means mostly clear skies.
June weather
June marks the beginning of the hot summer season in Caldwell, with temperatures peaking around 28 °C (82 °F). The sun beats down for 12 hours a day, and the rain becomes a rare event with only 5 days of rain this month.
July weather
July in Caldwell is the highlight of summer, with the mercury climbing to an average of 33 °C (92 °F) during the day. Evening respite comes with cooler temperatures at 14 °C (58 °F). The region enjoys a minimal 2 days of rainfall, making for predominantly sunny and dry conditions.
August weather
August maintains the sizzling summer vibe with day temperatures very similar to July, averaging 32 °C (90 °F). The nights offer only a slight cooldown to 13 °C (56 °F). With almost identical minimal rainfall of 2 days, the dry, sunny days continue to be the main theme.
September weather
As summer begins to wane in September, Caldwell experiences a pleasant dip in heat to 27 °C (80 °F) during the day, while nights become more comfortable at 8 °C (46 °F). You can still expect plenty of sunshine and only a slight increase in precipitation with 3 days of rain.
October weather
October introduces the fall chill with average daytime highs dropping to 19 °C (66 °F). As the leaves change color, the air crisps to an average low of 3 °C (37 °F). Latter-day rain chances increase to about 5 days but are mostly short and not too cold.
November weather
November sees a significant turn towards the colder temperatures of the impending winter, with highs now only reaching an average of 10 °C (50 °F) and nights cooling down significantly to -2 °C (29 °F). Caldwell's skies are often overcast, and with 9 days of rain, waterproof gear is suggested.
December weather
December in Caldwell marks the arrival of true winter conditions. With daytime highs just a little above freezing around 4 °C (38 °F), and night temperatures averaging -5 °C (22 °F), it's time to don the down jackets and thermal wear.
FAQs
How cold does it get at night in Caldwell in January?
January nights in Caldwell can be quite cold with average lows of -5 °C (22 °F), making it important to have a good heating system and warm pajamas.
Is February much warmer than January in Caldwell?
February slightly turns up the dial with average highs of 8 °C (46 °F), which is warmer than January, but still requires a cozy jacket when stepping outside.
What is the average high temperature in Caldwell during March?
With spring's arrival, Caldwell sees a pleasant increase in warmth to an average high of 14 °C (57 °F). It's time to enjoy the outdoors as winter releases its grip.
What kind of clothes are suitable for April weather in Caldwell?
April's milder climate means you can swap heavy winter coats for a lighter jacket or a sweater. With temperatures reaching highs up to 18 °C (65 °F), spring outfits can blossom fully.
Is May considered a warm month in Caldwell?
Absolutely, May introduces warmer weather with an average high of 23 °C (73 °F), making it an ideal time for picnics and outdoor sports in Caldwell's beautiful natural settings.
How high do temperatures get in Caldwell in June?
June truly heats up the scene, with daily highs soaring to approx. 28 °C (82 °F), signaling the need for sunscreen and a hat when venturing outside.
What are the typical daytime temperatures in Caldwell during July?
July is the hottest month in Caldwell, with typical daytime highs around a scorching 33 °C (92 °F), so light clothing and staying hydrated is a must.
Are August temperatures in Caldwell comparable to those of July?
Yes, August temperatures in Caldwell are quite comparable to July, with the thermostat often reading an average high of 32 °C (90 °F) during the day.
What is the average daily high temperature in Caldwell in September?
September in Caldwell, with daily highs of 27 °C (80 °F), is pleasantly warm – a perfect balance between the sweltering summer and the upcoming cooler fall.
What should visitors wear during October in Caldwell?
In October, dressing in layers is key in Caldwell as the weather transitions. You'll want a warm jacket for the cool mornings and evenings, with the possibility to peel off layers as the day reaches a high of 19 °C (66 °F).
What temperatures can one expect in Caldwell in November?
November in Caldwell ushers in a cooler atmosphere with temperatures averaging a high of 10 °C (50 °F) during the day and night temperatures dropping below freezing.
Are December days in Caldwell very cold?
Yes, December days in Caldwell are cold with average highs creeping just above the freezing mark at 4 °C (38 °F), making for a frosty prelude to winter wonderlands.
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