Last updated: April 22, 2025
In January, San Diego, Mexico experiences a delightful blend of warm weather and mild temperatures. With maximum highs reaching 33°C (93°F) and an average temperature of 21°C (70°F), this coastal gem enjoys plentiful sunshine, perfect for outdoor activities. The nights can be cooler, dipping to a minimum of 10°C (50°F), making for comfortable evenings. Rainfall is minimal, with only 8 mm (0.3 in) recorded over a single day, contributing to the 76% humidity that enhances the tropical feel. Visitors can expect a pleasant climate that invites exploration and relaxation alike.
January in San Diego, Mexico, ushers in mild and inviting temperatures, making it an ideal retreat from colder climates. With minimums around 10°C (50°F), averages hovering at 21°C (70°F), and maximizing at 33°C (93°F), this month sets a pleasant tone for the year ahead. As winter transitions to spring, you’ll notice a gradual warming trend; February introduces slightly higher averages and maxima, reflecting a steady shift toward the warmer months. This pattern continues into March and April, where the temperatures climb, peaking at 37°C (99°F) toward the end of April. Notably, the consistent warmth persists through May and June, showcasing San Diego's alluring climate. With temperatures remaining comfortably mild throughout the month and hints of summertime warmth beginning to emerge, January remains a charming gateway into the vibrant seasons ahead.
In January, San Diego, Mexico, experiences a tranquil start to the year with a modest precipitation of just 8 mm (0.3 in), typically spread across a single day of rainfall. As the months progress, a noticeable shift occurs: February and March maintain similar dry spells, each contributing only 5 mm (0.2 in) of rain, but by April, the rainfall nearly doubles to 11 mm (0.4 in), hinting at the impending wet season. The contrast becomes stark in May and June, where precipitation surges to 88 mm (3.5 in) and 183 mm (7.2 in) respectively, showcasing the region's transition into its rainier months. This trend of increasing rainfall peaks around the summer, with August and September also delivering significant totals of 91 mm (3.6 in) and 156 mm (6.2 in). By October, the rains begin to taper off, leading into drier months towards the year's end, with November and December seeing only 31 mm (1.2 in) and 8 mm (0.3 in) of rain, respectively, each accompanied by just a few rainy days. This pattern highlights the stark contrast between the winter months' dry conditions and the summer's lush downpours, marking San Diego's unique climatic rhythm.
In January, San Diego, Mexico, experiences a relatively high humidity level of 76%, setting the stage for a humid winter atmosphere. This level of moisture is notably higher than the following month, February, which sees a decrease to 68%, signaling a gradual drop as the region transitions into spring. As the months progress, humidity continues to decline, reaching its lowest point in April at 57%. However, soon after, the humidity begins to rise again, peaking in the warmer months of August and September at 82%, reminiscent of tropical conditions. Interestingly, this trend persists into the fall, with October reaching an even higher 83%, before dipping back to 76% in December. Overall, January's humidity is part of a broader cyclical pattern that showcases the region's shifting moisture levels throughout the year.
In January, San Diego experiences a UV Index of 10, categorized as very high, which means you're at risk of sunburn in just 15 minutes of sun exposure. This trend of elevated UV levels continues into the next months, with February through July showing extreme levels of UV radiation, peaking at 14-15 and reducing burn time to a brisk 10 minutes. The high UV Index persists into the late summer and early fall, maintaining an extreme category until October, before dropping to very high levels again in November and December. These fluctuations highlight the importance of sun safety measures during the winter months, as the sun's intensity is often underestimated. To learn more, visit San Diego UV Index.
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In January, San Diego welcomes the new year with a generous 252 hours of sunshine, setting a bright tone for the months ahead. As winter transitions into spring, the sunlight steadily increases, reaching 287 hours in February and peaking at an impressive 324 hours in March. This sunny trend continues through April and May, maintaining around 314 hours, making it an ideal time for outdoor adventures. The long summer days kick in during July, where sunshine soars to 329 hours, remaining high through August and September, with 318 and 293 hours respectively. As autumn arrives, the sunshine remains abundant, wrapping up the year with 304 hours in November and 316 hours in December. Overall, the steady rise in sunlight hours, especially in the spring and summer months, portrays San Diego as a year-round sun-soaked paradise.
In January, San Diego, Mexico, welcomes the new year with a 53% chance of sunny weather, setting a promising tone for the month. This likelihood stands in stark contrast to the following months, where sunshine becomes more prevalent, peaking at 79% in February. As spring approaches, the probability remains high at 77% in March, before dipping to 55% in April and continuing its downward trend through the summer months. Interestingly, while January presents a moderate chance of sunshine, it forms a foundation for the more luminous February, emphasizing the region's gradual transition from winter's clouds to the vibrant sun of spring. Even as the likelihood of sun wanes in subsequent months, January's moderate warmth and potential shine remain a delightful start to the year.
In San Diego, Mexico, January ushers in 11 hours of daylight, a duration that remains steady through February as the days begin to subtly lengthen. March marks a shift as daylight increases to 12 hours, a trend that continues through the subsequent months of April and May. This increased exposure to sunlight reaches its peak in June, offering an invigorating 13 hours of daylight. As summer wanes, daylight diminishes, gently tapering back to 12 hours from July to September. By October, the cycle begins anew, returning to 11 hours as the daylight hours stabilize through the winter months, enveloping the region in a comforting rhythm of light and dark throughout the year.
In January, the winds in San Diego typically whisper along the coast at an average speed of 2.3 m/s (5 mph), setting a gentle tone for the month. This consistent breeze continues into February before picking up slightly in March to 2.6 m/s (6 mph), hinting at the changing seasons. As spring approaches, winds moderate again, dipping to 2.2 m/s (5 mph) in April and reaching their lowest point of the year in June with a soft breeze of 1.2 m/s (3 mph). However, the summer months bring a revival, with July and November reflecting the earlier January speeds at 2.3 m/s (5 mph), while December gently settles back to 2.2 m/s (5 mph). Overall, the wind patterns reveal a soft oscillation, with peaks in early spring and late fall, creating a pleasant and mild atmosphere year-round.
The weather in San Diego changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of January's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in San Diego and find detailed weather information for every month.
In January, the weather features a comfortable range with minimum temperatures around 10°C (50°F) and maximums peaking at 33°C (93°F), while February sees a slight increase in warmth, with average temperatures rising to 22°C (72°F) and maximums reaching 35°C (96°F). Precipitation levels are low in both months, with January receiving 8 mm (0.3 in) and February slightly less at 5 mm (0.2 in), each having only one day of precipitation. Additionally, January’s humidity remains higher at 76%, compared to February's 68%, suggesting a drier feel as the month progresses. For more detailed insights, you can check San Diego weather in February.
In January, temperatures range from a minimum of 10°C (50°F) to a maximum of 33°C (93°F), while the average temperature hovers around 21°C (70°F). The month experiences minimal precipitation, totaling just 8 mm (0.3 in) over a single day, and humidity is relatively high at 76%. In contrast, March sees slightly warmer temperatures, with a minimum of 11°C (53°F), an average of 23°C (74°F), and a peak of 36°C (96°F). Precipitation in March is even lower at 5 mm (0.2 in) over one day, and humidity drops to 59%. For more details on the weather in this month, you can check San Diego weather in March.
In January, the weather is relatively mild, with temperatures ranging from a minimum of 10°C (50°F) to a maximum of 33°C (93°F) and an average temperature of 21°C (70°F). The month experiences minimal precipitation of just 8 mm (0.3 in) over 1 day, accompanied by a higher humidity level of 76%. In contrast, April sees warmer temperatures with a minimum of 14°C (57°F) and a peak of 37°C (99°F), averaging 25°C (78°F). Although April has slightly more precipitation at 11 mm (0.4 in) over 2 days, the humidity drops to 57%, making the overall climate feel more comfortable. For more details on weather in April, visit San Diego weather in April.
In January, the weather features milder temperatures, with a minimum of 10°C (50°F) and a maximum of 33°C (93°F), averaging around 21°C (70°F). Precipitation is minimal, with only 8 mm (0.3 in) falling over just one day, and humidity averaging 76%. In contrast, May brings warmer conditions, as temperatures range from a minimum of 17°C (62°F) to a maximum of 37°C (99°F), with an average temperature of 26°C (79°F). However, May is significantly wetter, experiencing 88 mm (3.5 in) of rain spread over 14 days, and humidity levels drop to 65%. For more details on this month, you can refer to San Diego weather in May.
In January, San Diego experiences mild temperatures, with a minimum of 10°C (50°F), an average of 21°C (70°F), and a maximum of 33°C (93°F). The weather is relatively dry, with only 8 mm (0.3 in) of precipitation over just one day, and humidity levels are around 76%. In contrast, June brings warmer weather, with minimum temperatures of 17°C (63°F), an average of 24°C (76°F), and a maximum of 35°C (95°F). However, this month sees significantly more rainfall, totaling 183 mm (7.2 in) over approximately 20 rainy days, and the humidity decreases to 66%. For more detailed information, you can check San Diego weather in June.
In January, the weather is generally mild with temperatures ranging from a minimum of 10°C (50°F) to a maximum of 33°C (93°F), while the average temperature hovers around 21°C (70°F). During this month, there is minimal precipitation at just 8 mm (0.3 in) over 1 day, and humidity levels are relatively high at 76%. In contrast, July brings warmer temperatures, with a minimum of 16°C (61°F) and a maximum of 35°C (95°F), while the average temperature stands at 24°C (76°F). This month experiences significantly more rainfall, totaling 42 mm (1.6 in) across 6 days, and humidity remains fairly stable at 75%. For a closer look at the weather in July, you can visit San Diego weather in July.
In January, the weather is generally mild, with temperatures ranging from a comfortable minimum of 10°C (50°F) to a maximum of 33°C (93°F), and an average temperature of about 21°C (70°F). Precipitation is low, with only 8 mm (0.3 in) recorded over just 1 day, and humidity levels stand at 76%. In contrast, August brings warmer temperatures, with a minimum of 16°C (61°F) and a maximum reaching 36°C (97°F), averaging around 25°C (76°F). However, August is also wetter, experiencing 91 mm (3.6 in) of precipitation over 14 days, and slightly higher humidity at 82%. For more detailed insights on the weather during this month, check out San Diego weather in August.
In January, the weather is typically warm with temperatures ranging from a minimum of 10°C (50°F) to a maximum of 33°C (93°F), averaging around 21°C (70°F). The month sees minimal precipitation, averaging only 8 mm (0.3 in) over just one day, and a humidity level of 76%. In contrast, September experiences slightly cooler averages, with temperatures ranging from a minimum of 16°C (61°F) to a high of 33°C (92°F), resulting in an overall average of 24°C (75°F). However, September is significantly wetter, receiving 156 mm (6.2 in) of rain over 19 days, and humidity increases to 82%. For more detailed information, you can check San Diego weather in September.
In January, the weather is generally mild with temperatures ranging from a minimum of 10°C (50°F) to a maximum of 33°C (93°F), averaging around 21°C (70°F). The month sees minimal precipitation, with only 8 mm (0.3 in) typically occurring over just 1 day, and humidity levels hover around 76%. In contrast, October experiences slightly warmer temperatures, with a minimum of 16°C (61°F) and a maximum reaching 34°C (93°F), averaging 23°C (74°F). However, October is much wetter, with about 134 mm (5.3 in) of rainfall spread across approximately 15 days, and humidity rises to 83%. For more detailed information, check out San Diego weather in October.
In January, temperatures range from a minimum of 10°C (50°F) to a maximum of 33°C (93°F), with an average of 21°C (70°F). The month sees minimal precipitation, averaging only 8 mm (0.3 in) over just one day, and the humidity sits at 76%. In contrast, November experiences slightly warmer temperatures; the minimum is 13°C (55°F) and the average is 22°C (72°F), with a maximum also reaching 33°C (91°F). However, November is notably wetter, with precipitation totaling 31 mm (1.2 in) spread over five days, and humidity increasing slightly to 80%. For more details about the weather in this month, visit San Diego weather in November.
In January, temperatures in San Diego typically range from a mild 10°C (50°F) at night to a warm 33°C (93°F) during the day, with an average temperature of 21°C (70°F). The month sees minimal precipitation, averaging just 8 mm over a single day, and maintains a consistent humidity level of 76%. In contrast, December experiences a similar temperature range with a minimum of 10°C (51°F), an average of 21°C (71°F), and a maximum of 32°C (90°F). However, December has slightly more precipitation, totaling 8 mm over two days, while also holding steady at 76% humidity. For a more detailed comparison, you can check out San Diego weather in December.
January in San Diego offers a delightful contrast to the warmer months, as temperatures are pleasantly mild with a comfortable average of 21°C (70°F). This month stands out with minimal precipitation, recording just 8 mm across only one day, making it one of the driest times of the year. The 76% humidity adds a touch of coastal moisture but is easily manageable. Whether you're escaping winter chill or simply exploring the scenic beauty, January's weather invites outdoor enjoyment without the sweltering heat typical of the summer months. For a deeper dive into what San Diego has to offer throughout the year, check out San Diego Climate.