Last updated: April 22, 2025
January in San Diego, Mexico, offers a refreshing climate that is perfect for outdoor exploration. With maximum temperatures reaching 29°C (84°F), the days are pleasantly warm, while average temperatures hover around 15°C (59°F), providing a comfortable backdrop for various activities. Nights can be cool, with minimum temperatures dipping to 2°C (36°F), so a light jacket is advisable. Despite the 4 mm (0.2 in) of rainfall across just one day, the month is predominantly dry, accompanied by humidity levels at 74%, which adds a subtle warmth to the air. Whether you're basking in the sun or taking in the scenic landscapes, January presents an ideal time to enjoy the vibrant culture of this coastal city.
In January, San Diego, Mexico, experiences a delightful range of temperatures, with nighttime lows dipping to around 2°C (36°F) and daytime highs reaching up to 29°C (84°F). This month marks the transition into warmer weather, as the average temperature hovers around a comfortable 15°C (59°F). As the year progresses into February, temperatures start to rise slightly, with lows increasing to 4°C (40°F) and maximums climbing to 31°C (88°F), signaling the approach of spring. Notably, the trend of rising temperatures continues through the subsequent months, peaking in May and June, where average highs hit a sizzling 36°C (97°F). While January may provide a brisk start to the year, the gradual warming trend is unmistakable and sets the stage for the balmy days ahead.
In January, San Diego, Mexico, experiences a minimal precipitation of only 4 mm (0.2 in), falling on just one day throughout the month. This pattern of low rainfall is characteristic of the region during the winter months, setting the stage for a gradual increase as the year progresses. February sees a slight rise, with 6 mm of rain, while March continues the trend with 7 mm. However, it's in the warmer months, particularly from May to August, that San Diego witnesses a significant surge in precipitation, peaking at 160 mm in July, often shared over multiple days. This seasonal transition illustrates a distinctive dry-to-wet cycle, highlighting the stark contrast between the dry winters and the lush, rain-soaked summer months that define the region’s climate.
In January, the humidity in San Diego, Mexico, stands at a notable 74%, setting the stage for a moderately damp start to the year. As temperatures gradually rise through February and March, humidity begins to ease, dropping to 65% and 58%, respectively. This trend of declining moisture continues through April, maintaining at 58%, before experiencing a slight uptick in May to 67%. The summer months bring a significant rise, with June peaking at 76%, showcasing San Diego's tendency towards increased humidity during this time. A summer reprieve follows, as humidity levels dip to the mid-to-high 60s in July and August. Yet, as fall approaches, the moisture returns with a vengeance, culminating in a high of 84% by November. This cycle of fluctuating humidity illustrates the unique climate dynamics of San Diego, highlighting a distinct shift from the drier winter months to the moisture-laden autumn.
In January, San Diego, Mexico experiences a UV Index of 9, indicating a very high risk of harm from unprotected sun exposure, with a burn time of just 15 minutes. As the months progress, the UV levels escalate sharply, with February and March reaching an extreme index of 11 and 14, respectively, demanding even greater caution with a burn time of only 10 minutes. This trend continues through to June, maintaining an extreme status, showcasing the importance of sun protection as these peak months approach. Interestingly, the UV Index slightly declines in November and December, but remains very high, reminding residents and visitors alike to stay vigilant. For more information about UV trends throughout the year, check out San Diego UV Index.
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January in San Diego, Mexico, shines with 235 hours of sunlight, a delightful promise of the sunshine that follows in the coming months. As the seasons progress, the days grow longer and brighter, with February ushering in 271 hours. By March, the sun graces San Diego with 320 hours, paving the way for April's peak of 326 hours. This upward trend continues into May, where sunshine reaches 345 hours, making it the sunniest month of the year. Although June and July see a slight dip to 319 and 332 hours respectively, the warmth remains inviting. August brings 327 hours, while September and October experience a gradual decline to 295 and 293 hours. Yet, even as the year winds down, November and December maintain a respectable 283 and 288 hours. Overall, the sun-drenched January sets the stage for an inspiring seasonal journey through light, inviting visitors to bask in the warmth of San Diego.
In January, San Diego enjoys a 62% chance of sunny weather, making it a delightful start to the year. This trend of sunshine continues to climb in February, reaching an impressive 88%, before gradually tapering off in the following months. While March still offers a robust 79% chance of clear skies, April and May see slight dips, landing at 68% and 63% respectively. Surprisingly, the summer months take a turn, with June and July dropping to just 24%, highlighting a striking contrast to the earlier months of the year. As the seasons shift, sunny days become more prominent again in November and December, with chances of 65% and 73% respectively. Overall, January stands out as a solid option for those seeking sun, setting the stage for a vibrant winter experience before the weather takes a summer detour.
In San Diego, Mexico, January greets residents with 11 hours of daylight, a duration that remains steady into February. As spring approaches in March, the days begin to lengthen, with sunlight stretching to 12 hours. This trend of increasing daylight continues into April and May, ultimately peaking during the height of summer in June and July, where the sun graces the region with 13 hours daily. As autumn sets in, the daylight gradually recedes; August sees a drop to 12 hours, followed by a return to 11 hours in October and November, before narrowing down to 10 hours in December. This cyclical pattern highlights the vibrant transition of seasons in San Diego, ensuring that each month brings its own unique rhythm of light.
In January, San Diego, Mexico, experiences a delightful average wind speed of 2.3 m/s (5 mph), setting the stage for a mild and breezy start to the year. As the months progress, the winds pick up slightly, with February and April showcasing the highest gusts at 2.7 m/s (6 mph) and 2.9 m/s (7 mph) respectively. Interestingly, March and May see a slight decrease, returning to 2.6 m/s and 2.5 m/s. While July brings a dip to 2.1 m/s (5 mph), the overall trend reveals a gentle fluctuation throughout the months, highlighting a unique characteristic of San Diego’s climate. By November, the wind speeds return to 2.3 m/s, providing a consistent, soothing breeze that complements the region's pleasant weather 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 comparing the weather of January and February, January tends to be slightly cooler with a minimum temperature of 2°C (36°F) and an average of 15°C (59°F), while February sees a mild increase with a minimum of 4°C (40°F) and an average temperature of 17°C (64°F). February also boasts higher maximum temperatures, reaching up to 31°C (88°F) compared to January's peak of 29°C (84°F). Both months experience low precipitation, with January receiving 4 mm (0.2 in) over 1 day and February slightly higher at 6 mm (0.2 in) on the same number of days, though February has lower humidity levels at 65% compared to 74% in January. For more detailed information, you can check San Diego weather in February.
In January, weather conditions are quite mild, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 29°C (84°F). The month sees minimal precipitation, averaging just 4 mm (0.2 in) over only one day, and the humidity is relatively high at 74%. In contrast, March experiences slightly warmer temperatures, with a minimum of 5°C (41°F) and a maximum of 33°C (92°F). While precipitation increases to 7 mm (0.3 in) over two days, the humidity drops to a comfortable 58%. Overall, March offers a more dynamic weather experience compared to the cooler, more humid January. For more detailed information, check out San Diego weather in March.
January and April showcase distinct climatic contrasts. In January, temperatures range from a chilly 2°C to a warm 29°C, averaging around 15°C, with humidity levels at 74% and a slight chance of precipitation (4 mm over 1 day). Conversely, April offers a more temperate experience, with minimum temperatures at 8°C and maximums reaching up to 35°C, averaging 22°C. The month boasts drier conditions, experiencing only 3 mm of precipitation over no rainy days and a lower humidity of 58%. For more information, check out San Diego weather in April.
In January, temperatures in San Diego range from a minimum of 2°C (36°F) to a maximum of 29°C (84°F), with an average of 15°C (59°F). The month sees minimal precipitation, only about 4 mm (0.2 in) over just one day, coupled with a relatively high humidity of 74%.
In contrast, May experiences warmer temperatures, with a minimum of 12°C (53°F) and a maximum reaching up to 36°C (97°F), resulting in an average temperature of 23°C (74°F). Precipitation increases significantly to 36 mm (1.4 in) over approximately six days, while humidity decreases to 67%. For more details, check out San Diego weather in May.
January and June present contrasting weather conditions in San Diego. In January, temperatures range from a mild 2°C (36°F) to a maximum of 29°C (84°F), with low precipitation of just 4 mm (0.2 in) over only one day, and humidity averages around 74%. In stark contrast, June sees significantly warmer temperatures, with a minimum of 12°C (54°F) and highs reaching 36°C (97°F). Precipitation also increases sharply to 156 mm (6.2 in) spread over 15 days, coupled with a slight rise in humidity to 76%. For a detailed overview, check out San Diego weather in June.
In January, the weather features a mild temperature range with a minimum of 2°C (36°F), an average of 15°C (59°F), and a maximum of 29°C (84°F). This month experiences minimal precipitation, with only 4 mm (0.2 in) over just one day, and a relatively high humidity of 74%. In contrast, July brings warmer temperatures, with a minimum of 12°C (54°F), an average of 20°C (69°F), and a maximum of 31°C (89°F). However, July is significantly wetter, receiving 160 mm (6.3 in) of rainfall across 20 days, with a lower humidity level of 67%. For more specific insights into the July weather, you can check San Diego weather in July.
In January, the weather is characterized by milder temperatures, with minimums around 2°C (36°F) and maximums reaching up to 29°C (84°F), averaging 15°C (59°F). The month experiences minimal precipitation, only about 4 mm (0.2 in) over just 1 day, along with a higher humidity level of 74%. In contrast, August sees warmer temperatures, with minimums at 12°C (54°F) and maximums climbing to 31°C (88°F), averaging 20°C (69°F). However, this month is significantly wetter, experiencing 145 mm (5.7 in) of rainfall spread over 17 days, while humidity drops slightly to 68%. For more detailed information on August weather, you can explore San Diego weather in August.
In January, the weather showcases a mild climate with a minimum temperature of 2°C (36°F) and an average of 15°C (59°F), peaking at a comfortable 29°C (84°F). The month is relatively dry, with only 4 mm (0.2 in) of precipitation occurring on just one day, accompanied by a humidity level of 74%. In contrast, September brings a warmer environment, with temperatures ranging from a minimum of 9°C (49°F) to an average of 20°C (68°F), and a maximum reaching 31°C (88°F). However, this month is characterized by significantly higher rainfall, totaling 147 mm (5.8 in) spread over 17 days, resulting in increased humidity at 81%. For more details, check out San Diego weather in September.
In January, the weather is relatively mild, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 29°C (84°F) and averaging around 15°C (59°F). Precipitation is minimal, with only 4 mm (0.2 in) expected over just one day, and humidity levels hover around 74%. In contrast, October offers slightly higher temperatures, with a minimum of 6°C (43°F) and a maximum reaching 31°C (89°F), averaging 19°C (67°F). However, it also brings significantly more rainfall, totaling 48 mm (1.9 in) over eight days, and increased humidity at 83%. For more detailed information, check out San Diego weather in October.
January and November in San Diego exhibit similar low temperatures, both starting at a minimum of 2°C (36°F). However, November tends to be slightly warmer on average, with temperatures reaching up to 30°C (87°F), compared to January's maximum of 29°C (84°F). Precipitation is notably higher in November, with 16 mm (0.6 in) falling over two days, while January only sees 4 mm (0.2 in) over a single day. Additionally, humidity levels are higher in November at 84%, compared to 74% in January. For more detailed insights, you can check out San Diego weather in November.
In comparing the weather of January and December, both months exhibit similar average temperatures, ranging from a minimum of 1°C (34°F) to a maximum of 29°C (84°F). However, January experiences slightly milder minimum temperatures of 2°C (36°F) compared to December's coldest point of 1°C. Precipitation levels are consistent in both months, with January and December receiving nearly the same amount—4 mm (0.2 in) and 4 mm (0.1 in) respectively, occurring on just one day in each month. It's worth noting that humidity is higher in December at 81%, while January’s humidity is a bit lower at 74%. For more insights on the unique weather patterns, you can check out San Diego weather in December.
January in San Diego offers a unique respite from the typically warmer months, with a refreshing average temperature of 15°C that invites outdoor exploration without the oppressive heat. Unlike the summer season, where temperatures soar, January's mild days — peaking at a comfortable 29°C — are complemented by relatively low rainfall, with only one day of precipitation throughout the month. This moderate climate, coupled with higher humidity levels at 74%, creates a refreshing atmosphere ideal for enjoying the city's stunning coastal scenery. For those curious about how the weather evolves throughout the year, delve deeper into the city's climatic patterns in our detailed guide on San Diego Climate.